Electronics Letters
Volume 49, Issue 9, 25 April 2013
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Volume 49, Issue 9
25 April 2013
- Features
- Antennas and propagation
- Biomedical technology
- Circuits and systems
- Electromagnetism
- Information and communications
- Microwave technology
- Photonics
- Power electronics, energy conversion and sustainability
- Radar, sonar and navigation
- Superconducting circuits, devices and systems
- Wireless communications
- Errata
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- Source: Electronics Letters, Volume 49, Issue 9, page: 574 –574
- DOI: 10.1049/el.2013.1243
- Type: Article
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- Author(s): Marco Gurrola-Navarro
- Source: Electronics Letters, Volume 49, Issue 9, page: 574 –574
- DOI: 10.1049/el.2013.1237
- Type: Article
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- Source: Electronics Letters, Volume 49, Issue 9, page: 575 –575
- DOI: 10.1049/el.2013.1241
- Type: Article
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- Source: Electronics Letters, Volume 49, Issue 9, page: 576 –576
- DOI: 10.1049/el.2013.1240
- Type: Article
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in brief
interview
3: it's the magic number
a sense of the absolute
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- Author(s): J.J. Liu ; K.P. Esselle ; S.G. Hay ; S.S. Zhong
- Source: Electronics Letters, Volume 49, Issue 9, p. 579 –580
- DOI: 10.1049/el.2012.4123
- Type: Article
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p.
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A printed ultra-wideband (UWB) antenna with five notched stop bands is presented. By introducing a pair of arc-shaped slots, two defected ground structures and an open-loop resonator, five sharp notches are achieved at frequencies of 2.4, 3.2, 5.2, 5.8 and 7.5 GHz. The proposed antenna has been fabricated and tested. The measured results indicate that the proposed design not only supports UWB bandwidth requirements but rejects five narrow bands to avoid possible interference with existing communication systems. In addition, the proposed antenna has relatively omnidirectional radiation patterns in passbands.
- Author(s): P. Ludlow ; V. Fusco ; G. Goussetis ; D.E. Zelenchuk
- Source: Electronics Letters, Volume 49, Issue 9, p. 580 –582
- DOI: 10.1049/el.2013.0541
- Type: Article
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Presented is a design methodology which permits the application of distributed coupled resonator bandpass filter principles to form wideband small-aperture evanescent-mode waveguide antenna designs. This approach permits matching of the complex antenna aperture admittance of an evanescent-mode open-ended waveguide to a real impedance generator, and thereby to a coaxial feed probe. A simulated reflection coefficient of < − 10 dB was obtained over a bandwidth of 20%, from 2.0–2.45 GHz, in a 2.58 GHz cutoff waveguide. Dielectric-filled propagating waveguide and air-filled evanescent-mode waveguide sections are used to form the resonators/coupling elements of the antenna's coupled resonator matching sections. Simulated realised gain variation from 3.4–5.0 dBi is observed across the bandwidth. The antenna's maximum aperture dimension is < 0.47 λ0 at the upper operating frequency and so it is suitable for use in a wide angle scanning phased array.
- Author(s): O. Yurduseven ; D. Smith ; M. Elsdon
- Source: Electronics Letters, Volume 49, Issue 9, p. 582 –584
- DOI: 10.1049/el.2013.0478
- Type: Article
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A novel combination of a parametrically optimised UWB meshed circular disc monopole antenna with a polycrystalline silicon (poly-Si) solar cell is presented and discussed. The results indicate that the fabricated meshed solar monopole antenna operates across the frequency band 2.33–10.8 GHz with an average broadband gain of 4.1 dBi. It is demonstrated that by meshing the monopole pattern an adequate solar efficiency of 13.1% can be achieved.
Planar ultra-wideband antenna with five notched stop bands
Small aperture evanescent-mode waveguide antenna matched using distributed coupled resonators
UWB meshed solar monopole antenna
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- Author(s): J.-Y. Shin ; H.-H. Nam ; K.-J. Lee
- Source: Electronics Letters, Volume 49, Issue 9, p. 584 –585
- DOI: 10.1049/el.2012.3715
- Type: Article
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When using a glucose meter for point-of-care testing, the hematocrit (HCT) estimation is important to reduce errors associated with the measurement of blood glucose concentration. A high HCT results in lowered blood glucose levels while for a low HCT it is increased from the actual values. Proposed is an HCT estimation method using amperometry and indirectly measuring blood viscosity in a small volume capillary cell of a disposable sensor strip. Depending on the estimated HCT, the glucose concentration is calculated using the adaptive calibration curve. The proposed method shows a glucose value with improved accuracy compared to the single calibration curve method.
Estimation of glucose concentration using adaptive calibration curve in different hematocrit levels
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- Author(s): X. Xing and G. Gielen
- Source: Electronics Letters, Volume 49, Issue 9, p. 585 –587
- DOI: 10.1049/el.2013.0536
- Type: Article
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A 40 MHz-bandwidth (BW) 12-bit delta-sigma modulator (DSM) fabricated in 90 nm CMOS is presented. A noise-free capacitive local feedback scheme is proposed for noise transfer function complex zeros generation. Moreover, the operational transconductance amplifiers (OTAs) are implemented with a current-sharing feedforward technique to largely reduce the power and to boost the gain. With a 960 MHz clock frequency and 1.2 V supply, the modulator achieves 74.4 dB dynamic range and 69.7 dB peak signal-to-noise and distortion ratio (SNDR). The DSM FoM is 0.22 pJ/conv, which is among the lowest of the published moderate resolution DSMs in this high-bandwidth range.
- Author(s): B. Srisuchinwong and D. Nopchinda
- Source: Electronics Letters, Volume 49, Issue 9, p. 587 –589
- DOI: 10.1049/el.2013.0029
- Type: Article
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p.
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A new chaotic jerk circuit has been realised using a current-tunable technique. Based on traditional nonlinearity of a signum function, newly smooth transitions from a balanced double-scroll chaotic jerk attractor to an unbalanced double-scroll and eventually to either a left-half or a right-half single-scroll chaotic jerk attractor are experimentally revealed using either a negative or a positive adjustable current source I 0, respectively. Current-tunable bifurcations are demonstrated. A plot of the largest Lyapunov exponent resembles a symmetrically balanced image centred at I 0 = 0.
- Author(s): Hyeong-Ju Kang ; Byung-Do Yang ; Jong-Yeol Lee
- Source: Electronics Letters, Volume 49, Issue 9, p. 589 –591
- DOI: 10.1049/el.2013.0689
- Type: Article
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p.
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Proposed is a low-complexity twiddle factor multiplication structure for fast Fourier transform (FFT). In an FFT implementation, the twiddle factor multiplication requires a large ROM to store the twiddle factors. In the proposed structure, the ROM is partitioned into two small ROMs, whose sum of areas is much smaller than that of the original ROM. The proposed structure requires an additional multiplier, but the multiplier is shown to be small in the experimental results. The results show that the proposed structure reduces the area of the twiddle factor multiplication by around 30% with a marginal degradation in SQNR performance.
- Author(s): K.-J. Baek ; J.-M. Gim ; H.-S. Kim ; K.-Y. Na ; N.-S. Kim ; Y.-S. Kim
- Source: Electronics Letters, Volume 49, Issue 9, p. 591 –592
- DOI: 10.1049/el.2013.0554
- Type: Article
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A new analogue circuit design methodology using independently optimised self-cascode (SC) structures is proposed. Based on the concept of the dual-workfunction-gate structures, which are equivalent to SC structures, transconductance and output resistance optimised SC MOSFETs were used in the differential input and output stages, respectively. An operational amplifier (opamp) with the proposed design methodology using standard 0.18 µm CMOS technology was designed to provide better performance. The measured DC gain of the fabricated opamp with independently-optimised SC MOSFETs was approximately 12 dB higher than that of the conventional opamp.
- Author(s): M.A. Gurrola-Navarro ; R. Carrasco-Alvarez ; A.S. Medina-Vazquez ; G. Espinosa-Flores-Verdad
- Source: Electronics Letters, Volume 49, Issue 9, p. 592 –594
- DOI: 10.1049/el.2013.0472
- Type: Article
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p.
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An adaptation of the hard-thresholding denoising method for analogue circuits is presented. The proposed approach has been proved with a chip fabricated in 0.5 µm CMOS technology. The system works for signals contaminated with white Gaussian noise in the range 100 kHz to 1.6 MHz. On-chip measurements demonstrate a noise reduction up to 7 dB.
- Author(s): J. Choi
- Source: Electronics Letters, Volume 49, Issue 9, p. 594 –595
- DOI: 10.1049/el.2012.4303
- Type: Article
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A novel idea for ultimate noise isolation in high-speed digital systems on packages and printed circuit boards (PCBs) is presented. Ultimate noise isolation in high-speed digital systems on packages and PCBs can be achieved using the following concept: ‘a power island surrounded by a plurality of mixed alternating impedance electromagnetic bandgap (AI-EBG) structures-based power distribution network’. In this idea, the gap around the power island provides excellent isolation from DC to the first resonant frequency of the parallel plates in packages or in PCBs and mixed AI-EBG structures provide excellent isolation from around the first resonant frequency to a substantially infinite frequency. This novel structure is designed, fabricated, and measured, which demonstrates ultimate noise isolation capability in high-speed digital systems on packages and PCBs.
- Author(s): S. Lj. Perić ; D.S. Antić ; V.D. Pavlović ; S.S. Nikolić ; M.T. Milojković
- Source: Electronics Letters, Volume 49, Issue 9, p. 595 –597
- DOI: 10.1049/el.2012.4475
- Type: Article
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A new ultra-selective lowpass finite impulse response (FIR) filter function is proposed. First, a new difference equation with all coefficients equals one, and the general structure of the corresponding linear-phase lowpass digital filter is given. Then, the high economical realisation with only four adders and without multipliers, for any filter order is presented. The concrete example of the proposed filter, compared to the already existing filters, demonstrates a higher selectivity, lower passband and circuit of lower complexity.
40 MHz-BW continuous-time ΔΣ modulator with capacitive local feedback and current-sharing OTA
Current-tunable chaotic jerk oscillator
Low complexity twiddle factor multiplication with ROM partitioning in FFT processor
Analogue circuit design methodology using self-cascode structures
On-chip wavelet denoising system implemented with analogue circuits
Ultimate noise isolation in high-speed digital systems on packages and printed circuit boards
Ultra-selective lowpass linear-phase FIR filter function
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- Author(s): T.P. Stefański
- Source: Electronics Letters, Volume 49, Issue 9, p. 597 –598
- DOI: 10.1049/el.2012.4462
- Type: Article
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A discrete Green's function (DGF) approach to couple 3D FDTD subdomains is developed. The total-field/scattered-field subdomains are simulated using the explicit FDTD method whilst interaction between them is computed as a convolution of the DGF with equivalent current sources measured over Huygens surfaces. In the developed method, the DGF waveforms are truncated using the Hann's window. The error varies in the range − 65 to − 40 dB depending on the DGF length and positions of the subdomains. However, if the DGF length is equal to the number of iterations in a simulation, this approach returns the same results as the direct FDTD method.
Discrete Green's function approach to disjoint domain simulations in 3D FDTD method
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- Author(s): Xiaodong Zhu ; Haichao Hu ; Youxi Tang
- Source: Electronics Letters, Volume 49, Issue 9, p. 599 –600
- DOI: 10.1049/el.2012.4350
- Type: Article
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The cubic metric (CM) is being regarded as a more accurate metric for envelope fluctuations of orthogonal frequency division multiplexing (OFDM) signals than peak-to-average power ratio (PAPR). Iterative clipping and filtering (ICF) is a simple and efficient technique for PAPR reduction. However, analysis shows that it cannot achieve sufficient CM reduction due to the difference between the two metrics. Proposed is a new technique called descendent clipping and filtering (DCF) for CM reduction. Unlike ICF, DCF introduces a new parameter termed descent factor to improve its performance. Simulation results show that DCF can achieve better performance with only one iteration than ICF with multiple iterations
- Author(s): Guohua Zhang ; Rong Sun ; Xinmei Wang
- Source: Electronics Letters, Volume 49, Issue 9, p. 600 –602
- DOI: 10.1049/el.2013.0320
- Type: Article
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For any row weight L and any circulant permutation matrix size P > (L − 1)2 + b 0(L − 1) (b 0 = L − 2 + mod(L,2)), a class of (3,L) quasi-cyclic (QC) low-density parity-check (LDPC) codes is explicitly constructed with girth eight, based on the quadratic function f(x) = x 2 + bx and its derivative, where b is either of the two integers {b 0, − b 0 − 2(L − 2)}. Compared with a similar construction from the so-called difference sequence, the proposed construction is not only much more simple in concept, but also completely deterministic in the sense that no computer search or computing is required. Simulation results show that the new codes significantly outperform the girth-eight codes constructed by the earliest-sequence-based method.
Descendent clipping and filtering for cubic metric reduction in OFDM systems
Deterministic construction of girth-eight (3,L) QC-LDPC codes from quadratic function
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- Author(s): R. Głogowski ; J.-F. Zürcher ; C. Peixeiro ; J.R. Mosig
- Source: Electronics Letters, Volume 49, Issue 9, p. 602 –604
- DOI: 10.1049/el.2013.0388
- Type: Article
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A simple right-angle transition between a rectangular waveguide (RWG) and a substrate integrated waveguide (SIW) is proposed. Two slots etched on the broad wall of the SIW are used to couple the waveguides. To obtain a wide bandwidth of operation the slots have different lengths to create a double resonance behaviour. The proposed component has a simple mechanical configuration with the flange of the standard RWG flush-mounted to the substrate of the SIW. A sample transition is designed to work in the lower part of the Ka-band. The experimental results agree well with numerical predictions. The proposed component has 6.6% bandwidth and insertion loss below 0.5 dB.
- Author(s): S.J. Xue ; H.T. Zhu ; W.J. Feng ; W.Q. Che
- Source: Electronics Letters, Volume 49, Issue 9, p. 604 –605
- DOI: 10.1049/el.2012.4312
- Type: Article
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A dual-wideband bandstop filter with high selectivity using transversal signal-interaction concept is proposed. Five transmission poles in the passband between the two stopbands can be achieved due to the superposition of signals for the two transmission paths. A planar dual-wideband bandstop filter prototype for WLAN bands with 10 dB fractional bandwidths of 76.2% and 26.9% has been designed and fabricated.
- Author(s): J.-X. Chen ; C. Shao ; J. Shi ; Z.-H. Bao
- Source: Electronics Letters, Volume 49, Issue 9, p. 605 –607
- DOI: 10.1049/el.2013.0238
- Type: Article
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Presented is a novel multilayer dual-mode dual-band bandpass filter (BPF) using two identical microstrip cross-slotted patch resonators placed back-to-back. The lengths of the slots on the patch resonator are designed to be different, which can be used to control the two degenerate modes individually so as to build two passbands of the proposed BPF. Two separated coupling paths for the two modes can be realised by the etched slits on the common ground plane of the two microstrip resonators. As a result, the coupling coefficients between the two resonators in each passband can be controlled independently. Furthermore, a new source-load coupling scheme is incorporated in this design to enhance the stopband rejection and then improve the band-to-band isolation significantly.
Broadband Ka-band rectangular waveguide to substrate integrated waveguide transition
Dual-wideband bandstop filter using transversal signal-interaction concept
Multilayer independently controllable dual-band bandpass filter using dual-mode slotted-patch resonator
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- Author(s): P. Orr and P. Niewczas
- Source: Electronics Letters, Volume 49, Issue 9, p. 607 –608
- DOI: 10.1049/el.2012.4355
- Type: Article
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The advent of multiplexing interferometric schemes for fibre Bragg grating sensor interrogation has enabled the combination of large-scale multiplexing and high-resolution measurement. Described is a simple technique to add absolute wavelength measurement capabilities to any passive-interferometric multiplexer. Through simulation a wavelength accuracy of < 10 pm using common system specifications is demonstrated. The technique allows high-resolution interferometric interrogation to be applied to many key industrial applications requiring precise knowledge of absolute values, such as static temperature or strain, without trading-off high interrogation rate or resolution.
- Author(s): M. Spasojevic and L.R. Chen
- Source: Electronics Letters, Volume 49, Issue 9, p. 608 –610
- DOI: 10.1049/el.2013.0840
- Type: Article
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Discretely tunable optical delay lines using serial and step-chirped sidewall Bragg gratings in SOI are demonstrated. Delays of up to 60 ps (28 ps) in steps of 20 ps (14 ps) spanning bandwidths of 53 nm (33 nm) are obtained for serial (step-chirped) gratings.
- Author(s): K. Tanizawa ; S. Suda ; Y. Sakakibara ; T. Kamei ; R. Takei ; H. Kawashima ; S. Namiki ; M. Mori ; H. Ishikawa
- Source: Electronics Letters, Volume 49, Issue 9, p. 610 –612
- DOI: 10.1049/el.2013.0461
- Type: Article
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Reported is the measurement of spontaneous Raman scattering in a 13 mm-long hydrogenated amorphous silicon wire waveguide with ultrafast carrier decay time. Broad Raman emission with a peak wavelength of 1.55 µm was observed for a pump wavelength of 1.44 µm. The Raman frequency shift is 14.3 THz, and Raman gain coefficient is estimated to be 0.15 W− 1cm− 1.
- Author(s): M. Tan ; S.T.M. Fryslie ; J.K. Guenter ; J.A. Tatum ; R.H. Johnson ; K.D. Choquette
- Source: Electronics Letters, Volume 49, Issue 9, p. 612 –613
- DOI: 10.1049/el.2013.0693
- Type: Article
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A photonic crystal vertical-cavity surface-emitting laser with a spectral width of 0.16 nm and a 3dB small signal modulation bandwidth of 16.2 GHz is demonstrated. Separation of optical and current apertures enables a narrow spectral width and an extremely low operating current density of ∼ 1 kA/cm2 simultaneously. It can potentially be used as a high-reliability laser source that enables error-free transmission over long multimode fibre links at high data rate.
Absolute wavelength calibration technique for multiplexing interferometric fibre Bragg grating sensor interrogation systems
Discretely tunable optical delay lines using serial and step-chirped sidewall Bragg gratings in SOI
Observation of spontaneous Raman scattering in hydrogenated amorphous silicon wire waveguide at 1.55 µm
Photonic crystal VCSELs with narrow spectral width and high bandwidth operating at low current density
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- Author(s): J. Guzmán-Guemez and J. Moreno-Valenzuela
- Source: Electronics Letters, Volume 49, Issue 9, p. 613 –615
- DOI: 10.1049/el.2013.0605
- Type: Article
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A new controller for boost DC-to-DC power converters is proposed. The new scheme takes into account that the duty cycle is constrained to physically admissible values. The analysis of the closed-loop trajectories provides the conclusion that output voltage regulation is achieved in asymptotic form. Theoretical results are supported by using real-time experiments.
- Author(s): C. Tang ; Y. Sun ; X. Dai ; Y. Su ; S.K. Nguang ; A.P. Hu
- Source: Electronics Letters, Volume 49, Issue 9, p. 615 –617
- DOI: 10.1049/el.2012.4459
- Type: Article
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A time-delay perturbation (TDP) method is proposed to achieve the shifting of the stable resonant operating points of bifurcated inductive power transfer (IPT) systems. Theoretical analysis and experimental results have shown that the TDP method provides an effective way to shift the system operating point to any targeted stable point by simply specifying the corresponding control parameters.
Saturated control of boost DC-to-DC power converter
Shifting stable operating points of bifurcated IPT systems by time delay perturbation
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- Author(s): H.Y. Yao ; W.F. Sun ; X.Y. Ma ; X.X. Li ; L.C. Qian
- Source: Electronics Letters, Volume 49, Issue 9, p. 617 –618
- DOI: 10.1049/el.2013.0302
- Type: Article
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To investigate micro-Doppler signatures of precession for a warhead with empennages, the model of precession is built and mathematical formulas of a micro-Doppler induced by different scattering centres are derived. The relationship between the micro-Doppler appearing frequency of empennages and micro-motion frequencies is first acquired, then two important precession features, namely coning frequency and spinning frequency, are extracted based on the micro-Doppler. Simulation results are provided to demonstrate the validity of the proposed method.
- Author(s): Hongxi Lu ; Zhiyong Suo ; Rui Guo ; Zheng Bao
- Source: Electronics Letters, Volume 49, Issue 9, p. 618 –620
- DOI: 10.1049/el.2012.4467
- Type: Article
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Since the terrain slope cannot be neglected for forest height inversion with polarimetric synthetic aperture radar interferometry (PolInSAR), a sloped random volume over ground (S-RVoG) model is proposed to correct the terrain distortion for forest parameters estimation. A significant model complexity reduction is achieved by aligning the reference frame along the local terrain slope and changing the corresponding radar geometrical configuration. The proposed S-RVoG model inversion promises to provide much more accurate estimation of forest parameters and is validated with L-band PolInSAR data produced by PolSARpro software developed by the European Space Agency (ESA).
- Author(s): W.H. Choi ; H.K. Jang ; J.H. Shin ; T.H. Song ; J.B. Kim ; W.J. Lee ; Y.S. Joo ; C.-G. Kim
- Source: Electronics Letters, Volume 49, Issue 9, p. 620 –622
- DOI: 10.1049/el.2013.0645
- Type: Article
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A new design concept of a wideband radar absorbing structure consisting of load-bearing glass/MWCNT added epoxy composite and having low density/lightweight characteristics for C- to X-band and X- to Ku-band radar is presented. The proposed radar absorbing structures have triple layers which are the low density and light weight layer to reduce the total weight, covering layers to protect the foam layer from humidity absorption, and a load-bearing layer as the actual structural layer. The proposed designs satisfied −10 dB absorption in the C-band to X-band and X-band to Ku-band using only two different materials. Moreover, from a practical point of view, since thickness control of absorbing structures is an important factor for the absorbing performance, the proposed structures could minimise fabrication errors (precise thickness controls) by employing multiple layers for wideband absorbing performance.
Precession feature extraction of warhead with empennages
S-RVoG model for forest parameters inversion over underlying topography
Wideband radar absorbing structure with low density material and load-bearing MWCNT added composite material
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- Author(s): G. Küstler
- Source: Electronics Letters, Volume 49, Issue 9, p. 622 –623
- DOI: 10.1049/el.2012.4030
- Type: Article
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The diamagnetically stabilised levitation of an NdFeB cube magnet over superconductors is reported. The achieved levitation height of 44 mm is about three times higher than in a comparable conventional superconducting levitation setup with flux pinning only. The extraordinary levitation height may offer new applications in the field of highly sensitive seismometers or force meters.
Extraordinary levitation height in diamagnetically stabilised levitation system with superconductors
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- Author(s): W. Fan ; F. Sun ; P. Kyösti ; J. Nielsen ; X. Carreño ; M. Knudsen ; G. Pedersen
- Source: Electronics Letters, Volume 49, Issue 9, p. 623 –625
- DOI: 10.1049/el.2013.0709
- Type: Article
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A technique to emulate 3D geometry-based channel models in a multi-probe over the air test setup is presented. The proposed technique provides a general emulation framework for any spherical incoming power spectrum. The emulation method results in two optimisation objectives, which are both convex. They give optimal emulation accuracy and allow relatively low computational complexity.
- Author(s): C. Benavente-Peces ; F. Cano-Broncano ; A. Ahrens ; F.J. Ortega-González ; J.M. Pardo-Martín
- Source: Electronics Letters, Volume 49, Issue 9, p. 625 –627
- DOI: 10.1049/el.2013.0390
- Type: Article
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Antennas proximity produces the antennas correlation effect which impacts MIMO systems performance. This reported work analyses the singular values complementary cumulative distribution function (CCDF) to evaluate the receiver-side antennas correlation effect and the outcomes of the appropriate antennas usage, showing some results for a 4 × 4 MIMO channel with linearly and uniformly spaced antennas.
- Author(s): J. Jung ; P. Upadyaya ; D. Heo ; J.-H. Kim ; B.-S. Kim
- Source: Electronics Letters, Volume 49, Issue 9, p. 627 –628
- DOI: 10.1049/el.2012.4508
- Type: Article
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To minimise phase noise degradation with a wide tuning range, the proposed LC voltage controlled oscillator incorporates parallel coupled negative transconductance (g m ) cells. Phase noise for wide tuning range VCOs suffers from degradation of quality factor of tank inductors or tank capacitors due to their parasitic resistance. The proposed parallel coupled negative g m cells provide additional current to compensate for the loss of phase noise. The measured results show a tuning range of 25.4% and a phase noise of − 116.7 dBc/Hz at 1 MHz offset frequency at 5.87 GHz with power consumption of 1.4 mW. The figure-of-merit with the fractional tuning range of the VCO was − 199.9 dBc/Hz, which is the best among the latest state-of-the-art wide tuning range CMOS LC VCOs.
3D channel emulation in multi-probe setup
Analysis of singular values PDF and CCDF on receiver-side antennas correlated MIMO channels
Wide tuning range LC VCO with parallel coupled negative g m cells
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- Source: Electronics Letters, Volume 49, Issue 9, page: 628 –628
- DOI: 10.1049/el.2013.1224
- Type: Article
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