Online ISSN
1350-911X
Print ISSN
0013-5194
Electronics Letters
Volume 48, Issue 23, 8 November 2012
Volumes & issues:
-
Volume 59 (2023)
-
Volume 58 (2022)
-
Volume 57 (2021)
-
Volume 56 (2020)
-
Volume 55 (2019)
-
Volume 54 (2018)
-
Volume 53 (2017)
-
Volume 52 (2016)
-
Volume 51 (2015)
-
Volume 50 (2014)
-
Volume 49 (2013)
-
Volume 48 (2012)
-
Volume 47 (2011)
-
Volume 46 (2010)
-
Volume 45 (2009)
-
Volume 44 (2008)
-
Volume 43 (2007)
-
Volume 42 (2006)
-
Volume 41 (2005)
-
Volume 40 (2004)
-
Volume 39 (2003)
-
Volume 38 (2002)
-
Volume 37 (2001)
-
Volume 36 (2000)
-
Volume 35 (1999)
-
Volume 34 (1998)
-
Volume 33 (1997)
-
Volume 32 (1996)
-
Volume 31 (1995)
-
Volume 30 (1994)
-
Volume 29 (1993)
-
Volume 28 (1992)
-
Volume 27 (1991)
-
Volume 26 (1990)
-
Volume 25 (1989)
-
Volume 24 (1988)
-
Volume 23 (1987)
-
Volume 22 (1986)
-
Volume 21 (1985)
-
Volume 20 (1984)
-
Volume 19 (1983)
-
Volume 18 (1982)
-
Volume 17 (1981)
-
Volume 16 (1980)
-
Volume 15 (1979)
-
Volume 14 (1978)
-
Volume 13 (1977)
-
Volume 12 (1976)
-
Volume 11 (1975)
-
Volume 10 (1974)
-
Volume 9 (1973)
-
Volume 8 (1972)
-
Volume 7 (1971)
-
Volume 6 (1970)
-
Volume 5 (1969)
-
Volume 4 (1968)
-
Volume 3 (1967)
-
Volume 2 (1966)
-
Volume 1 (1965)
Volume 48, Issue 23
8 November 2012
In Brief
- Source: Electronics Letters, Volume 48, Issue 23, page: 1438 –1438
- DOI: 10.1049/el.2012.3762
- Type: Article
- + Show details - Hide details
-
p.
1438
(1)
-
- Author(s): Zheng Wang
- Source: Electronics Letters, Volume 48, Issue 23, page: 1438 –1438
- DOI: 10.1049/el.2012.3755
- Type: Article
- + Show details - Hide details
-
p.
1438
(1)
Dr Zheng Wang from Tianjin University in China talks about the research behind his Letter ‘Automatically fast determining of the feature number for ranking based feature selection' on page 1462. - Author(s): D. Davies
- Source: Electronics Letters, Volume 48, Issue 23, page: 1439 –1439
- DOI: 10.1049/el.2012.3759
- Type: Article
- + Show details - Hide details
-
p.
1439
(1)
US researchers report new RF power limiters based on III-Nitride materials that have unprecedented high operating voltages, excellent temperature stability and radiation hardness. Fully planar and simple to fabricate, these limiters could be used in nearly any type of microwave integrated circuit. - Author(s): J. Baldwin
- Source: Electronics Letters, Volume 48, Issue 23, page: 1440 –1440
- DOI: 10.1049/el.2012.3717
- Type: Article
- + Show details - Hide details
-
p.
1440
(1)
Researchers at the Vienna University of Technology in Austria tell us more about their work to show that multijunction photodetectors can detect the wavelength of LEDs over a wide spectral range.
Interview
Shifting boundaries
Inside View
-
- Author(s): L. Zheng ; X.L. Quan ; H.J. Liu ; R.L. Li
- Source: Electronics Letters, Volume 48, Issue 23, p. 1443 –1444
- DOI: 10.1049/el.2012.2913
- Type: Article
- + Show details - Hide details
-
p.
1443
–1444
(2)
A broadband planar antenna is developed for DVB-H and GSM-900 handset applications. The planar antenna is based on composite right- and left-hand (CRLH) structures, of which the resonant frequencies are determined by the four CRLH parameters. It has been demonstrated by simulation and experiment that the proposed antenna can achieve a bandwidth of about 70%, covering the DVB-H band for return loss>5 dB and the GSM-900 band for return loss>7.5 dB. The antenna gain, efficiency, and radiation pattern are suitable for DVB-H and GSM-900 mobile terminals. - Author(s): R. He ; D.J. Xu ; F. Shen
- Source: Electronics Letters, Volume 48, Issue 23, p. 1444 –1446
- DOI: 10.1049/el.2012.3033
- Type: Article
- + Show details - Hide details
-
p.
1444
–1446
(3)
A new array pattern synthesis method is proposed by using the concept of a sparse representation of beampattern, in which array pattern synthesis is achieved by evaluating the sparsity of beampattern and combining with a set of constraints on magnitude response. The proposed method can not only achieve a low sidelobe level, but also flexibly control the robust response region with specified beamwidth and response ripple. - Author(s): S. Chaimool ; C. Chokchai ; P. Akkaraekthalin
- Source: Electronics Letters, Volume 48, Issue 23, p. 1446 –1447
- DOI: 10.1049/el.2012.2665
- Type: Article
- + Show details - Hide details
-
p.
1446
–1447
(2)
A novel multiband loaded fractal loop monopole antenna using a Minkowski model is proposed. It is composed of a short monopole with a loaded fractal loop. The loaded fractal loop parameters are optimised starting from the Minkowski fractal model. The resulting antenna has a compact size of 10 × 45 × 0.8 mm3, which is suitable for USB dongle applications. From the measured results, the 10 dB return loss bandwidths of the proposed antenna cover the WiFi (2.4–2.484 and 5.15–5.35 GHz) and WiMAX (2.5–2.7 and 3.4–3.6 GHz) bands. - Author(s): H. Ren ; Y. Yu ; Z. Shen
- Source: Electronics Letters, Volume 48, Issue 23, p. 1447 –1449
- DOI: 10.1049/el.2012.2635
- Type: Article
- + Show details - Hide details
-
p.
1447
–1449
(3)
A broadband antenna consisting of four notch slots is proposed to generate circularly-polarised radiation. Wide bandwidth is achieved by using notch slots operating in the double-resonance range. A separate feeding network is designed to meet the requirement of sequential rotation excitation for the four slots maintaining a corresponding phase difference of 90° between adjacent slots. Simulated and measured results are presented to demonstrate the high directivity and wide bandwidth of the circularly-polarised antenna. The designed antenna exhibits a bandwidth from 4.9 to 6.1GHz for both |S11|≤ −10 dB and AR≤ 3 dB, which is 21% of the centre frequency of 5.5GHz. Peak gain at 5.5 GHz is 7.6 dBic along the zenith direction, with less than 1dB gain variation within the operating bandwidth.
Broadband planar antenna based on CRLH structure for DVB-H and GSM-900 applications
Array pattern synthesis using sparse representation of beampattern
Multiband loaded fractal loop monopole antenna for USB dongle applications
Broadband circularly-polarised antenna consisting of four notch slot radiators
-
- Author(s): S. Shin and S.-M. Kang
- Source: Electronics Letters, Volume 48, Issue 23, p. 1449 –1451
- DOI: 10.1049/el.2012.3517
- Type: Article
- + Show details - Hide details
-
p.
1449
–1451
(3)
An integrated circuit structure for a dual-band transcutaneous bio-implant system that can remove the problematic power interference coupled into the weak data telemetry signal is presented. The unwanted effect of coupled power interference is efficiently suppressed through a feedback cancellation that directly annihilates the interference with an optimally tuned fraction of the received power signal by the implanted power receiver.
Power interference cancellation for dual-band transcutaneous bio-implant systems
-
- Author(s): E. Kyriakides ; S. Carrara ; G. De Micheli ; J. Georgiou
- Source: Electronics Letters, Volume 48, Issue 23, p. 1451 –1452
- DOI: 10.1049/el.2012.3311
- Type: Article
- + Show details - Hide details
-
p.
1451
–1452
(2)
In the past, tantalum oxide devices have been used to create non-volatile digital memories, whilst neglecting the analogue memristive characteristics of such devices. In this Letter, it is shown that these devices can provide a low-cost, low-power solution for hemi-memristive devices, when used in their pre-formed, memristive region, whilst being fully CMOS compatible. Furthermore, measurements are presented from the devices that have been fabricated and it is shown that these devices do not require electroforming. Electroforming circuitry takes up valuable chip space at the transistor layers and significantly increases fabrication cost, since voltages as high as 12 V are required, which in turn requires extra masks to form high voltage devices and distribution circuits. - Author(s): W.-H. Sung ; M.-C. Lee ; C.-C. Chung ; C.-Y. Lee
- Source: Electronics Letters, Volume 48, Issue 23, p. 1452 –1454
- DOI: 10.1049/el.2012.3016
- Type: Article
- + Show details - Hide details
-
p.
1452
–1454
(3)
An ultra-low voltage 22T implicit multiplexed differential (IMD) flip-flop (FF) is proposed. An implicit multiplexer is designed to simplify the differential FF complexity, while its control data path is able to enhance the FF noise immunity as well. So, the fully static IMD-FF with modified differential topology provides a sufficient noise margin under voltage scaling. On the other hand, the IMD-FF operation avoids considerable DC current dissipation to save active power and suppresses the idle leakage by stacked transistors. The post-layout simulation in 90 nm CMOS process with 400 mV supply voltage shows that the IMD-FF achieves 56% active power and 42.2% leakage power reduction. The tolerable noise energy is enhanced by 18.9% on average. Finally, this work provides 93% function yield rate under the effect of process-voltage-temperature variations and 40 pJ input noise energy. - Author(s): M.E. Fouda and A.G. Radwan
- Source: Electronics Letters, Volume 48, Issue 23, p. 1454 –1455
- DOI: 10.1049/el.2012.3151
- Type: Article
- + Show details - Hide details
-
p.
1454
–1455
(2)
Recently, many promising applications are oriented towards the new memristive elements. But since these elements are not commercially available yet, the memristive elements emulators are very important. Introduced is a new memcapacitor emulator without using any memristor. The circuit concept and mathematical modelling are discussed analytically and numerically to validate the operation of the proposed emulator. Moreover, the proposed emulator is assembled using commercial off-the-shelf components and verified using PSpice simulations. - Author(s): N. Ahmad and S.M. Rezaul Hasan
- Source: Electronics Letters, Volume 48, Issue 23, p. 1456 –1457
- DOI: 10.1049/el.2012.2932
- Type: Article
- + Show details - Hide details
-
p.
1456
–1457
(2)
Adoption of the Advanced Encryption Standard (AES) as a symmetric encryption algorithm for numerous applications requires a low cost and low power design. Presented is a new 8-bit stream cipher architecture core for an application specific integrated circuit AES crypto-processor. The chip area and power are optimised along with high throughput. It is implemented in a 130nm CMOS process and supports both encryption and decryption using 128-bit keys with a throughput of 0.05 Gbit/s (at 100 MHz clock). This design utilises 3152 gate equivalents including an on-the-fly key scheduling unit along with 4.23 µW/MHz power consumption. Compared to other 8-bit implementations, the proposed design achieves a smaller chip size along with higher throughput and lower power dissipation.
Low-cost, CMOS compatible, Ta2O5-based hemi-memristor for neuromorphic circuits
Ultra-low voltage implicit multiplexed differential flip-flop with enhanced noise immunity
Charge controlled memristor-less memcapacitor emulator
Efficient integrated AES crypto-processor architecture for 8-bit stream cipher
-
- Author(s): Kyeong-Hwa Kim
- Source: Electronics Letters, Volume 48, Issue 23, p. 1457 –1459
- DOI: 10.1049/el.2012.1224
- Type: Article
- + Show details - Hide details
-
p.
1457
–1459
(3)
A dual estimator-based compensation scheme for the dead time and inverter nonlinearity unaffected by parameter variations in an inverter-fed permanent magnet synchronous motor (PMSM) drive is presented. Using the proposed scheme, the disturbance voltage caused by the dead time and nonlinearity can be effectively estimated even in the presence of parameter variations without any additional circuits or the disadvantages existing in the conventional methods. The effectiveness is verified through the simulations and experimental results.
Dual estimator-based compensation for dead time and nonlinearity unaffected by parameter variations in PMSM drive
-
- Author(s): Zhenyan Wang ; Zhen Zhang ; Jianqin Mao
- Source: Electronics Letters, Volume 48, Issue 23, p. 1459 –1460
- DOI: 10.1049/el.2012.2940
- Type: Article
- + Show details - Hide details
-
p.
1459
–1460
(2)
A Bouc-Wen model and parameter identification method is presented to describe the hysteresis characteristics in a piezoelectric actuator. Based on the model, a new feedback control scheme with a hysteresis compensator is proposed for the precise tracking control of the piezoelectric actuator. To verify the efficiency of the proposed control method, an experimental study in a piezoelectric actuator shows that the relative error of 1.8% is obtained at 1 Hz.
Precision tracking control of piezoelectric actuator based on Bouc-Wen hysteresis compensator
-
- Author(s): Hai Zhang ; Baoqing Zeng ; Lei Ao ; Wenfeng Zhang ; Nannan Li ; Jing Guo
- Source: Electronics Letters, Volume 48, Issue 23, p. 1460 –1462
- DOI: 10.1049/el.2012.3213
- Type: Article
- + Show details - Hide details
-
p.
1460
–1462
(3)
A novel printed four arcs coupler is proposed. Because of the central symmetry of the coupler, the cavity has a clear TE011 mode for measuring the complex permittivity. Its characteristics are compared with measurement and simulation results. Reasonable agreement has been observed, fully validating the design of the proposed coupler. This method has the advantages of simple setting of the apparatus and fast tuning of the coupling.
Printed four arcs coupler in cylindrical cavity for permittivity measurement
-
- Author(s): Z. Wang ; M. Sun ; J. Jiang
- Source: Electronics Letters, Volume 48, Issue 23, p. 1462 –1463
- DOI: 10.1049/el.2012.2638
- Type: Article
- + Show details - Hide details
-
p.
1462
–1463
(2)
The proposed feature number determining method for the ranking-based feature selection problem builds a convex hull in high-dimensional space for each category in the training dataset and estimates the discriminative degree by calculating the overlapped proportion of these high-dimensional convex hulls. Normalising these discriminative degrees, an initial selected feature number can be determined, then a local optimal result is output by using the hill climbing algorithm. This approach reduces the time consumed by the existing many ranking-based feature selection methods. Classification results on three data sets using three major feature ranking and selection criteria and an SVM classifier show considerable improvement in time consumed of feature selection and comparable accuracy. - Author(s): C. Bai ; W. Zou ; K. Kpalma ; J. Ronsin
- Source: Electronics Letters, Volume 48, Issue 23, p. 1463 –1465
- DOI: 10.1049/el.2012.2656
- Type: Article
- + Show details - Hide details
-
p.
1463
–1465
(3)
A new approach for image retrieval by combination of colour and texture features is proposed. This approach uses the histogram of feature vectors, which are constructed from the coefficients of some subbands of wavelet transform and chosen according to their intrinsic characters. A K-means algorithm is used to quantise feature vectors. The experimental results both on small size databases (40 classes of textures) and large size databases (167 classes of textures) show that, compared with the state-of-the-art approaches, the proposed approach can achieve better retrieval performance. - Author(s): P. Premaratne and M. Premaratne
- Source: Electronics Letters, Volume 48, Issue 23, p. 1465 –1467
- DOI: 10.1049/el.2012.2739
- Type: Article
- + Show details - Hide details
-
p.
1465
–1467
(3)
Subjective quality measures based on the human visual system for images do not agree well with well-known metrics such as mean squared error and peak signal-to-noise ratio. Recently, the structural similarity measure (SSIM) has received acclaim owing to its ability to produce results on a par with the human visual system. However, experimental results indicate that noise and blur seriously degrade the performance of the SSIM metric. Furthermore, despite the SSIM's popularity, it does not provide adequate insight into how it handles the ‘structural similarity’ of images. Proposed is a new structural similarity measure based on the approximation level of a given discrete wavelet decomposition that evaluates moment invariants to capture the structural similarity with superior results over the SSIM. - Author(s): N.-H. Keum ; H.-J. In ; K.W. Oh ; O.-K. Kwon
- Source: Electronics Letters, Volume 48, Issue 23, p. 1467 –1468
- DOI: 10.1049/el.2012.2728
- Type: Article
- + Show details - Hide details
-
p.
1467
–1468
(2)
A life time extension method for simultaneous emission driving active matrix organic light emitting diode (AMOLED) displays is proposed. The proposed driving method extends emission time by driving even and odd row lines separately. The extended emission time reduces organic light emitting diode (OLED) degradation because the current density of the OLED decreases as emission time increases. The proposed driving method increases the emission time by 50% compared with the conventional simultaneous emission driving method. Measurement results show the proposed driving method increases the OLED life time by 70.07% when the target luminance of the OLED is 300 cd/m2 and the life time is assumed that the time until the OLED luminance becomes 75% of the initial luminance. The proposed pixel structure using the even-odd separation driving scheme compensates the electrical characteristic variation of the polycrystalline-silicon thin film transistors and the maximum luminance error of pixel to pixel is 0.26% in a 3.8-inch AMOLED panel.
Automatically fast determining of feature number for ranking-based feature selection
Efficient colour texture image retrieval by combination of colour and texture features in wavelet domain
Image similarity index based on moment invariants of approximation level of discrete wavelet transform
Life time extension method for simultaneous emission driving AMOLED displays
-
- Author(s): S. Krinidis and M. Krinidis
- Source: Electronics Letters, Volume 48, Issue 23, p. 1468 –1470
- DOI: 10.1049/el.2012.3304
- Type: Article
- + Show details - Hide details
-
p.
1468
–1470
(3)
Fuzzy C-means is an efficient algorithm for data clustering. The fuzzy local information C-means (FLICM) algorithm was introduced by Krinidis and Chatzis for image clustering and it was proved that it has very good properties. Presented is a generalisation of the fuzzy local information C-means clustering algorithm, in order to be applicable to any kind of input data sets instead of images. The generalisation of FLICM maintains the properties of the original algorithm, and it is also effective and efficient, providing robustness against noise. Furthermore, it is fully free of any kind of empirically adjusted parameters, contrary to all other fuzzy C-means algorithms that have been proposed in the literature. - Author(s): P. Reviriego ; S. Pontarelli ; J.A. Maestro ; M. Ottavi
- Source: Electronics Letters, Volume 48, Issue 23, p. 1470 –1472
- DOI: 10.1049/el.2012.3270
- Type: Article
- + Show details - Hide details
-
p.
1470
–1472
(3)
Soft errors that affect flip-flops are a major issue in advanced electronic circuits. As technology scales, multiple bit errors become more likely. This limits the applicability of traditional protection techniques like triplication with voting or single error correction codes that can correct only one error. Multiple errors tend to affect adjacent bits, and therefore it is interesting to use error correction codes that can correct adjacent errors. The issue with these codes is that they require a large area and delay that limits their use to protect flip-flops in circuits. Presented are codes that can be implemented with low area and delay and can correct multiple adjacent errors. - Author(s): Z.X. Lu ; M.G. Gao ; Y.J. Li
- Source: Electronics Letters, Volume 48, Issue 23, p. 1472 –1473
- DOI: 10.1049/el.2012.3211
- Type: Article
- + Show details - Hide details
-
p.
1472
–1473
(2)
In the presence of pointing errors, a direction search based robust Capon beamformer is proposed. The direction of the desired signal is first estimated by searching for the local maximum of the array output power using the first-order Taylor series expansion of the array steering vector, and then the robust Capon beamformer is developed with the estimated direction as the presumed one.
Generalised fuzzy local information C-means clustering algorithm
Low-cost single error correction multiple adjacent error correction codes
Robust Capon beamformer based on direction search
-
- Author(s): S. Xu ; K. Ma ; F. Meng ; K.S. Yeo
- Source: Electronics Letters, Volume 48, Issue 23, p. 1473 –1475
- DOI: 10.1049/el.2012.2568
- Type: Article
- + Show details - Hide details
-
p.
1473
–1475
(3)
A novel lowpass filter (LPF) with a wide stopband by using defected ground structures (DGSs) and a transformed radial stub (TRS) in combination is proposed. The characteristics of DGS cells are investigated and the DGS embedded TRS LPFs are designed and verified by experiment. The designed DGS embedded TRS LPF demonstrates a passband insertion loss of less than 1dB, a cutoff frequency (fc) of 2.5GHz, a wide stopband with more than 16dB rejection up to 14fc, a passband return loss of better than 18dB and a compact size of 0.26λg×0.167λg (λg is the guided wavelength at the cutoff frequency). - Author(s): S.Y. Zheng and W.S. Chan
- Source: Electronics Letters, Volume 48, Issue 23, p. 1475 –1476
- DOI: 10.1049/el.2012.2817
- Type: Article
- + Show details - Hide details
-
p.
1475
–1476
(2)
By employing the coplanar waveguide feeding method, a dual-band dual-mode bandpass patch filter, with flexible frequency ratio and fractional bandwidth, is proposed. Two resonant frequency bands are achieved by using two stacked square patches with different cross slots etched, which are simultaneously excited by the centre CPW fed lines. The frequency ratio and fractional bandwidths can be controlled by the CPW broadside coupling and cross slots. To verify the proposed configuration, two dual-band bandpass patch filters have been designed, fabricated and measured. - Author(s): M. Kim ; J. Lee ; T. Yun
- Source: Electronics Letters, Volume 48, Issue 23, p. 1476 –1478
- DOI: 10.1049/el.2012.2642
- Type: Article
- + Show details - Hide details
-
p.
1476
–1478
(3)
A low-noise and high-gain down-conversion mixer fabricated via a 0.13 µm CMOS process is presented. The proposed mixer is based on the folded-type topology and includes an inverter transconductance, a switched biasing circuit and an LO switch, which improve the conversion gain and noise figure. Moreover, the switched biasing circuit is combined with a current bleeding circuit to reduce power consumption and flicker noise. A conversion gain of 24.75 dB and a noise figure of 4.59 dB were achieved at 2.1 GHz of RF while consuming 1.93 mW from a supply voltage of 1.0 V. - Author(s): M. Donelli ; I. Craddock ; D. Gibbins ; M. Sarafianou
- Source: Electronics Letters, Volume 48, Issue 23, p. 1478 –1479
- DOI: 10.1049/el.2012.2627
- Type: Article
- + Show details - Hide details
-
p.
1478
–1479
(2)
Presented is a methodology for the synthesis of complex electromagnetic sources based on the wave field synthesis. In particular, the wavefront of a propagating electromagnetic wave, generated by a suitable antenna, is synthesised using a set of point sources with specific amplitudes and phases, calculated with a suitable optimisation algorithm. This approach permits a reduction of the descriptive parameters of the scenario under consideration, a strong reduction of the computational resources and consequently a reduction of computational time necessary to simulate the scenario under investigation. The obtained results have been assessed considering experimental measurements, in particular an ultra-wideband antenna of a real microwave imaging system for breast cancer detection, has been considered. The agreement between numerical and experimental data is quite good. - Author(s): F. Jahan ; M. Gaevski ; J. Deng ; R. Gaska ; M. Shur ; G. Simin
- Source: Electronics Letters, Volume 48, Issue 23, p. 1480 –1481
- DOI: 10.1049/el.2012.3428
- Type: Article
- + Show details - Hide details
-
p.
1480
–1481
(2)
Reported is a low-loss RF power limiter built using a voltage-controlled capacitor formed by two planar Schottky contacts deposited over an AlGaN/GaN heterostructure. The symmetrical structure of the varactor enables dual-polarity voltage clamping. Small electrode size and electrode spacing of 2 µm ensures a low impedance and low loss. Varying the varactor width in the range 0.25 – 1 mm allows tuning of the limiting powers in the range 17 – 40 dBm, also dependent on the operating frequency. The small-signal loss at 10 GHz is 0.2 – 0.67 dB. The varactor structure fabrication does not require gate alignment or annealing; the device is robust and fully compatible with MMICs; it also provides the DC block with around 95 V breakdown. The PL operation in the temperature range 25 – 200oC without significant parameter degradation was demonstrated. Power limiter CW stress during 100 h at 24 dBm revealed no performance degradation. - Author(s): S. Simion
- Source: Electronics Letters, Volume 48, Issue 23, p. 1481 –1483
- DOI: 10.1049/el.2012.2620
- Type: Article
- + Show details - Hide details
-
p.
1481
–1483
(3)
A new method to design a small-size ring coupler is proposed, showing that the coupler may be seen as consisting of fully distributed composite right/left-handed phase shifters. A 3 dB ring coupler is designed by using the proposed method. The coupler is analysed numerically and then experimentally characterised. It is shown that the experimental results are in very good agreement with the expected ones. For the designed and fabricated coupler, the area reduction is about 50%, compared to the conventional ring coupler. - Author(s): R. Habibi ; Ch. Ghobadi ; J. Nourinia ; M. Ojaroudi ; N. Ojaroudi
- Source: Electronics Letters, Volume 48, Issue 23, p. 1483 –1484
- DOI: 10.1049/el.2012.2718
- Type: Article
- + Show details - Hide details
-
p.
1483
–1484
(2)
Self-complementary structures are used to design a novel compact band-stop filter for X-band applications. By cutting a rectangular slot with five pairs of L-shaped protruded strips inside the slot on the ground plane and by inserting five pairs of L-shaped stubs in the microstrip transmission line, the self-complementary structure is created, hence a constant and flat impedance bandwidth at the X-band can be produced. The operating frequencies of the filter can be easily controlled by changing the dimensions of the protruded L-shaped strips and stubs, without changing the area taken up by the structure. Experimental results show good agreement with simulation results and demonstrate that excellent stop-band performance could be obtained through the proposed band-stop filter.
DGS embedded transformed radial stub for ultra-wide stopband lowpass filter
Compact dual-band bandpass patch filter using coplanar waveguide feed method
Low-noise and high-gain mixer combining switched-biasing and current-bleeding techniques
Modelling complex electromagnetic sources for microwave imaging systems with wave field synthesis technique
RF power limiter using capacitively-coupled contacts III-nitride varactor
Small-size ring coupler design method based on fully distributed composite right/left-handed approach
Very compact broad band-stop filter using periodic L-shaped stubs based on self-complementary structure for X-band application
-
- Author(s): Ming Luo ; Cai Li ; Tao Jiang ; Chao Li ; Zhixue He ; Xiao Xiao ; Xingwen Yi ; Zhu Yang ; Shaohua Yu ; Qi Yang
- Source: Electronics Letters, Volume 48, Issue 23, p. 1484 –1486
- DOI: 10.1049/el.2012.2936
- Type: Article
- + Show details - Hide details
-
p.
1484
–1486
(3)
With careful designs to combat fibre nonlinearity, 4×1.93 Tbit/s 8-PSK DFT-S OFDM transmission over 2240 km SSMF is experimentally demonstrated. The spectral efficiency within each superchannel is 5.6 bit/s/Hz. - Author(s): E. Yamada ; N. Kikuchi ; A. Sano ; T. Kobayashi ; Y. Shibata ; H. Ishii ; Y. Miyamoto
- Source: Electronics Letters, Volume 48, Issue 23, p. 1486 –1487
- DOI: 10.1049/el.2012.2490
- Type: Article
- + Show details - Hide details
-
p.
1486
–1487
(2)
86 Gbit/s PDM 16-QAM signal generation and transmission over 240 km using an InP optical IQ modulator is demonstrated for the first time. 16-QAM signals were generated with an InP IQ modulator driven at 10.7 GSymbol/s by two sets of 4-level differential signals generated by an arbitrary waveform generator and differential amplifiers. It is confirmed that there was little difference between the BER performance for a back-to-back configuration and that after a 240 km transmission.
4×1.93 Tbit/s 8-PSK DFT-S coherent optical OFDM transmission over 2240 km SSMF
86 Gbit/s PDM 16-QAM signal transmission using InP optical IQ modulator
-
- Author(s): M. Müller ; P. Wolf ; C. Grasse ; M.P.I. Dias ; M. Ortsiefer ; G. Böhm ; E. Wong ; W. Hofmann ; D. Bimberg ; M.-C. Amann
- Source: Electronics Letters, Volume 48, Issue 23, p. 1487 –1489
- DOI: 10.1049/el.2012.3355
- Type: Article
- + Show details - Hide details
-
p.
1487
–1489
(3)
The large-signal modulation characteristics of 1.3 µm vertical-cavity surface-emitting lasers (VCSELs) with buried tunnel junction and reduced cavity length are presented. A short overview of the VCSEL design and static device characteristics is given. Employing these devices, the error-free data transmission at 25 Gbit/s over up to 25 km of singlemode fibre is reported for the first time. The impact of transient laser chirp and fibre dispersion on the received optical power and the bit error rate is discussed. - Author(s): M. Yamada ; S. Aozasa ; H. Ono
- Source: Electronics Letters, Volume 48, Issue 23, p. 1489 –1490
- DOI: 10.1049/el.2012.2850
- Type: Article
- + Show details - Hide details
-
p.
1489
–1490
(2)
The first ASE light source with a flat and broadband ASE spectrum in the 1800 nm wavelength region has been developed by combining a Tm3+-Tb3+-doped fibre and a Tm3+-doped fibre. The achieved bandwidth where the ASE intensity exceeded −20 dBm/nm was 162 nm (from 1690 to 1852 nm). - Author(s): S. Schidl ; A. Polzer ; H. Zimmermann
- Source: Electronics Letters, Volume 48, Issue 23, p. 1490 –1492
- DOI: 10.1049/el.2012.2842
- Type: Article
- + Show details - Hide details
-
p.
1490
–1492
(3)
A sensor system for the wavelength determination of LEDs is presented. The used sensor is a triple junction photodiode which needs no external filters. The sensor is implemented in a standard BiCMOS process without any process modifications. The sensor system is optimised for low analogue complexity and compatibility with mass production in a cost-sensitive environment. A proof of concept sensor system is presented which demonstrates the ability to determine the wavelength of LEDs. The measurements evaluate the linearity of the system and the possibility for a fast calibration in the production environment. - Author(s): P.D. Dragic
- Source: Electronics Letters, Volume 48, Issue 23, p. 1492 –1493
- DOI: 10.1049/el.2012.3175
- Type: Article
- + Show details - Hide details
-
p.
1492
–1493
(2)
A novel approach to broadening and flattening the Brillouin gain spectrum is presented. A linear combination of two acoustically anti-guiding optical fibres gives rise to a Brillouin spectrum with less than 0.5 dB gain variation over>200 MHz. The fibres are selected so that they possess individual Brillouin spectra that are shifted in frequency from each other, such that a relative maximum of one overlaps with a relative minimum of the other.
1.3 µm short-cavity VCSELs enabling error-free transmission at 25 Gbit/s over 25 km fibre link
Broadband ASE light source for 1800 nm wavelength region
LED wavelength determination sensor system with BiCMOS triple junction photodetector
Ultra-flat Brillouin gain spectrum via linear combination of two acoustically anti-guiding optical fibres
-
- Author(s): Y. Cho
- Source: Electronics Letters, Volume 48, Issue 23, p. 1493 –1495
- DOI: 10.1049/el.2012.2760
- Type: Article
- + Show details - Hide details
-
p.
1493
–1495
(3)
An online current offset compensation method is proposed for photovoltaic (PV) inverter applications. In order to detect a current offset in the system, a simple full order observer is designed. By assuming the current offset to be a DC component in steady state, the observer gain selection becomes extremely easy. After that, a simple feed-forward compensation method is applied to eliminate the current offset. The proposed method is experimentally verified by using a PV inverter prototype.
Observer based online current offset compensation method for single-phase photovoltaic inverter applications
-
- Author(s): C. Gu and C. Li
- Source: Electronics Letters, Volume 48, Issue 23, p. 1495 –1497
- DOI: 10.1049/el.2012.2451
- Type: Article
- + Show details - Hide details
-
p.
1495
–1497
(3)
Displacement measurement based on a continuous-wave (CW) sensor suffers from frequency-dependent signal distortion that is caused by harmonics generated by nonlinear phase modulation. Analysed is the signal distortion problem in AC-coupled CW radar sensors, which may lead to false signal demodulation but has been neglected in the past. It is found that the signal distortion comes from the loss of spectrum characteristics as the signal goes through the AC-coupled receiver chain. Both simulations and experimental results show that the ribbon-like signal distortion decreases as the target motion frequency increases. Furthermore, a guideline for solving the frequency-selective distortion issue in continuous-wave radar displacement sensors is presented. - Author(s): Jong-Hwan Lim ; Heung-Su Kim ; Jae-Hyuk Youn ; Hoon-Gee Yang ; Young-Seek Chung ; Doo-Soo Kim ; Hee-Young Lee ; Seon-Joo Kim
- Source: Electronics Letters, Volume 48, Issue 23, p. 1497 –1498
- DOI: 10.1049/el.2012.0506
- Type: Article
- + Show details - Hide details
-
p.
1497
–1498
(2)
Presented is a novel monopulse estimator that uses the inverse function of a monopulse ratio (MR) curve of the maximum likelihood (ML)-based monopulse estimator. The proposed estimator exploits the fact that the ML-based MR curve is approximated by one tangent function. The proposed estimator works in two steps, in which the ML-based estimator is applied first and then its output is corrected by the inverse function of the MR curve of the ML-based estimator. Its derivation is presented, in addition to simulation results showing that it outperforms the conventional ML-based estimator. - Author(s): W. Ke ; T.T. Wang ; L.N. Wu
- Source: Electronics Letters, Volume 48, Issue 23, p. 1498 –1500
- DOI: 10.1049/el.2012.2544
- Type: Article
- + Show details - Hide details
-
p.
1498
–1500
(3)
Proposed is a novel sparsity-based direct position determination appoach to locate multiple targets in a region of interest. Since targets lie at a few points in the discrete spatial domain, this inherent sparsity can be exploited to convert the localisation problem into a sparse recovery problem. An iterative reweighted sparse recovery algorithm is also proposed to enhance the sparsity, especially under low signal-to-nosie ratio conditions. Furthermore, the locations of targets can be obtained from noisy signals by solving an approximate norm l0 minimisation problem, even if the number of targets is not known a priori. Simulation results demonstrate the performance of the proposed algorithm on the location estimation accuracy.
Frequency-selective distortion in continuous-wave radar displacement sensor
Monopulse estimator using inverse function of MR curve
Multi-target direct localisation via approximate l0 norm minimisation
-
- Author(s): M.S. Mahani and R. Abhari
- Source: Electronics Letters, Volume 48, Issue 23, p. 1500 –1501
- DOI: 10.1049/el.2012.3361
- Type: Article
- + Show details - Hide details
-
p.
1500
–1501
(2)
A hybrid substrate integrated waveguide (SIW) interconnect composed of a baseband and a bandpass structure sharing the same physical area is implemented using a flexible substrate. This interconnect, which is aimed for chip-to-chip ultra-high-speed multichannel data communication, has been studied by measuring its S-parameters and time domain system performance. The fabricated hybrid SIW was subjected to various bending angles and the impact on signal integrity was observed by monitoring the output eye diagrams as well as reflection and transmission coefficients. System performance was measured with the data rate of 3.125 Gbit/s channel for both baseband and bandpass channels, which shows excellent quality eye diagrams for each channel. - Author(s): H.-J. Lee and S. Lee
- Source: Electronics Letters, Volume 48, Issue 23, p. 1501 –1503
- DOI: 10.1049/el.2012.3135
- Type: Article
- + Show details - Hide details
-
p.
1501
–1503
(3)
Using a new extraction method based on the physical input equivalent circuit separating the overlap component from the gate capacitance, the non-quasi-static gate resistance in a small-signal RF MOSFET model is accurately determined. This new method results in much better agreements up to 30GHz between the measured and modelled data of Y11+Y12 than a conventional one. - Author(s): P.S. Ko ; M. Han ; S.D. Kim
- Source: Electronics Letters, Volume 48, Issue 23, p. 1503 –1504
- DOI: 10.1049/el.2012.3363
- Type: Article
- + Show details - Hide details
-
p.
1503
–1504
(2)
Perhydropolysilazane spin-on-dielectric (SOD) is examined as a SiOx buffer for the plasma-enhanced CVD (PECVD) Si3N4 passivation of AlGaN/GaN high-electron-mobility transistors (HEMTs). Compared to HEMTs passivated by the conventional PECVD Si3N4, the SOD-buffered structure shows about two times greater saturation drain current. From the modified charge control model and Silvaco device simulation, it is proposed that this ehancement is due to the minimised plasma-induced surface states in the SOD-buffered structure compared to a high density (∼5×1012/cm2) of negatively charged states in the PECVD Si3N4 passivation structure.
Experimental evaluation of flexible high-speed interconnect system using substrate integrated waveguide technology
Extraction method for non-quasi-static gate resistance of RF MOSFETs
Perhydropolysilazane spin-on-dielectric passivation buffer layers for AlGaN/GaN high-electron mobility transistors
-
- Author(s): Z.L. Huang ; C.J. Diao ; M. Chen
- Source: Electronics Letters, Volume 48, Issue 23, p. 1505 –1506
- DOI: 10.1049/el.2012.2795
- Type: Article
- + Show details - Hide details
-
p.
1505
–1506
(2)
A latency reduced method is proposed based on the modified successive cancellation (MSC) decoder for decoding polar codes. In the MSC decoder, it was shown that latencies for both the rate-zero and the rate-one nodes can be reduced. By redistributing the information bits, the proposed method can obtain a good rate-zero and rate-one nodes distribution, in which decoding latency can be further reduced under the MSC decoder. Simulation results show that the new polar code (obtained by the proposed method) achieves 8.5% latency reduction with neglected error performance loss compared with the original polar code. Furthermore, it is easy to adjust the trade-off between the error performance and decoding latency by the proposed method. - Author(s): K. Dong ; X. Liao ; S. Zhu
- Source: Electronics Letters, Volume 48, Issue 23, p. 1506 –1508
- DOI: 10.1049/el.2012.2994
- Type: Article
- + Show details - Hide details
-
p.
1506
–1508
(3)
In this reported work, the blockage probability for the 60GHz radio links is analysed in typical indoor environments with random human activities. With up to Q random distributed human bodies, the average blockage possibility is calculated in the sense of statistics for the radio links between the user devices and the ceiling-mounted access point (AP) in a typical wireless LAN architecture. Also, the blockage impact to the effective channel capacity is quantified as a reduction related to the blockage probability. Numerical simulations show that the blockage probability increases almost linearly as the user devices are moving towards the edge of the service area, and the increasing rate is largely affected by the height of the AP and the human density. - Author(s): M.J. Ho ; S.M. Berber ; K.W. Sowerby
- Source: Electronics Letters, Volume 48, Issue 23, p. 1508 –1510
- DOI: 10.1049/el.2012.3374
- Type: Article
- + Show details - Hide details
-
p.
1508
–1510
(3)
Measurements of radio signal leakage from a building at 821 MHz and 2.193 GHz are presented. It is shown that the COST231 outdoor-to-indoor building penetration model is suitable for predicting this leakage. Indoor locations that give the best indication of leaked power are also identified. These are important if indoor cognitive radio transmitter powers are to be controlled dynamically by an indoor sensor network. Signal strength at indoor locations near the building walls exhibits high correlation with the leaked power. - Author(s): H. Ko and C. Kim
- Source: Electronics Letters, Volume 48, Issue 23, p. 1510 –1511
- DOI: 10.1049/el.2012.2812
- Type: Article
- + Show details - Hide details
-
p.
1510
–1511
(2)
Presented is a novel MAC protocol based on the IEEE 802.11 distributed coordination function (DCF). It incorporates a new function that allows stations to use tacit reservations for transmissions; thus the stations can avoid random access attempts. Tacit reservation is assumed without any control messages, and it enables contention-free transmissions. The performance of the proposed protocol is evaluated using simulations, and it is shown that it outperforms legacy DCF, DCF with optimal contention window, and ideal DCF with respect to channel utilisation.
Latency reduced method for modified successive cancellation decoding of polar codes
Link blockage analysis for indoor 60GHz radio systems
Building leakage propagation measurements for indoor cognitive radio systems
TR-MAC: an enhancement of IEEE 802.11 DCF using tacit reservations
Most viewed content for this Journal
Article
content/journals/el
Journal
5
Most cited content for this Journal
-
Extreme multistability in a memristive circuit
- Author(s): Bo-Cheng Bao ; Quan Xu ; Han Bao ; Mo Chen
- Type: Article
-
Absorptive frequency selective surface using parallel LC resonance
- Author(s): Qiang Chen ; Liguo Liu ; Liang Chen ; Jiajun Bai ; Yunqi Fu
- Type: Article
-
Partial spectral search-based DOA estimation method for co-prime linear arrays
- Author(s): Fenggang Sun ; Peng Lan ; Bin Gao
- Type: Article
-
Experimental verification of on-chip CMOS fractional-order capacitor emulators
- Author(s): G. Tsirimokou ; C. Psychalinos ; A.S. Elwakil ; K.N. Salama
- Type: Article
-
54 Gbit/s OOK transmission using single-mode VCSEL up to 2.2 km MMF
- Author(s): G. Stepniak ; A. Lewandowski ; J.R. Kropp ; N.N. Ledentsov ; V.A. Shchukin ; N. Ledentsov Jr. ; G. Schaefer ; M. Agustin ; J.P. Turkiewicz
- Type: Article
