Online ISSN
1350-911X
Print ISSN
0013-5194
Electronics Letters
Volume 26, Issue 24, 22 November 1990
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Volume 26, Issue 24
22 November 1990
Two new ternary line codes
- Author(s): L. Botha ; H.C. Ferreira ; M. Whalley
- Source: Electronics Letters, Volume 26, Issue 24, p. 1989 –1990
- DOI: 10.1049/el:19901286
- Type: Article
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p.
1989
–1990
(2)
Two new ternary line codes are presented. Although the two codes are similar, they differ with respect to error propagation properties and power spectral densities. The codes are relatively simple, yet they satisfy tight channel input restrictions, making them suitable for use in practical baseband communications systems.
‘Synchronous’ CDMA demonstration for fibre-optic networks with optical processing
- Author(s): W.C. Kwong and P.R. Prucnal
- Source: Electronics Letters, Volume 26, Issue 24, p. 1990 –1992
- DOI: 10.1049/el:19901287
- Type: Article
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p.
1990
–1992
(3)
‘Synchronous’ code-division multiple-access (S/CDMA) for fibre-optic networks with optical processing is investigated. A two-user experiment demonstrating the feasibility of such a network is performed at 10 Mbit/s (500 Mchip/s) using modified prime sequence codes and optical processing. Fibre-optic delay-lines are used for code sequence generation and correlation without using fast electronic components. An environment in which S/CDMA would be particularly suitable is discussed.
High-efficiency coupling of laser diodes in tapered proton-exchanged waveguides
- Author(s): K. Mizuuchi ; K. Yamamoto ; T. Taniuchi
- Source: Electronics Letters, Volume 26, Issue 24, p. 1992 –1994
- DOI: 10.1049/el:19901288
- Type: Article
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p.
1992
–1994
(3)
Low-loss coupling between a laser diode and a tapered waveguide fabricated by selective area proton-exchange in LiNbO3 is reported. The effectiveness of this waveguide is demonstrated by generating 12.3 mW of second harmonic blue light pulse by Cerenkov radiation.
Magnetostatic wave mixer
- Author(s): P. Hyben ; R. Ceskovic ; P. Kabos ; J. Cermak ; A. Abraham
- Source: Electronics Letters, Volume 26, Issue 24, p. 1994 –1995
- DOI: 10.1049/el:19901289
- Type: Article
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p.
1994
–1995
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A new element, allowing the mixing of signals in the microwave frequency range is described. Excitation of magnetostatic waves (MSW) in the non-stationary medium has been used to modulate the carrier harmonic signal. The proper choice of the working point allows the higher harmonic products of the output frequency spectrum to be suppressed.
Analysis of ‘D type’ flip-flop frequency changers
- Author(s): D.I. Shaw ; J.C. Bennett ; A.M. Clements
- Source: Electronics Letters, Volume 26, Issue 24, p. 1995 –1997
- DOI: 10.1049/el:19901290
- Type: Article
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p.
1995
–1997
(3)
A novel approach using Fourier analysis to model a digital system, in this case a ‘D type’ flip-flop, is presented. An analysis of the flip-flop using mathematics, with a graphical example to illustrate the logic operation of the flip flop as a frequency changer, in this case a down-convertor, is presented. This type of analysis could prove invaluable in modelling digital phase locked loops and frequency synthesisers.
Overconstrained version of moment method for prediction of electromagnetic energy deposition inside dielectric objects
- Author(s): S. Caorsi ; G.L. Gragnani ; M. Pastorino
- Source: Electronics Letters, Volume 26, Issue 24, p. 1997 –1998
- DOI: 10.1049/el:19901291
- Type: Article
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p.
1997
–1998
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An overconstrained version of the moment method is presented that is based on a redundant number of testing functions and the use of a pseudoinversion transformation to solve the related overdetermined system of equations. Preliminary results prove that numerical solutions to electromagnetic scattering problems involved in SAR calculation can also be reached by using limited computer resources.
Coplanar-waveguide/microstrip probe coupler and applications to antennas
- Author(s): R.N. Simons and R.Q. Lee
- Source: Electronics Letters, Volume 26, Issue 24, p. 1998 –2000
- DOI: 10.1049/el:19901292
- Type: Article
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p.
1998
–2000
(3)
A method to couple microwave power from a coplanar waveguide to a microstrip line on opposite sides of a ground plane is demonstrated. The coupler uses a metallic post which passes through an aperture on the ground plane connecting the strip conductor of the coplanar waveguide to the microstrip line. The measured insertion loss and return loss are about 1 dB and 10 dB, respectively, across the frequency range of 0.045–6.5 GHz. To demonstrate potential applications of the coupler as a feeding network for a microstrip patch array, measured radiation patterns of two rectangular patch antennas with a direct coplanar-waveguide/microstrip feed and with a proximity coupled coplanar-waveguide/microstrip feed are presented.
High frequency Pnp AlGaAs/InGaAs heterojunction bipolar transistor with an ultrathin strained base
- Author(s): W.U. Liu ; D. Hill ; D. Costa ; J.S. Harris
- Source: Electronics Letters, Volume 26, Issue 24, p. 2000 –2002
- DOI: 10.1049/el:19901293
- Type: Article
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p.
2000
–2002
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High performance Pnp AlGaAs/InGaAs heterojunction bipolar transistors (HBTs) have been fabricated. The transistors have a 300 Å strained InGaAs base, with indium composition linearly graded from 0 to 15%. The cutoff frequency and maximum oscillation frequency for a transistor with emitter area of 2 × 8 μm2 are measured to be 23.3 GHz and 40 GHz, respectively, at a collector current of −10 mA. These are the highest published results for Pnp HBTs.
Correlation of relative intensity noise with linewidth floors in narrow linewidth DFB lasers
- Author(s): H. Sundaresan and N.C. Fletcher
- Source: Electronics Letters, Volume 26, Issue 24, p. 2002 –2003
- DOI: 10.1049/el:19901294
- Type: Article
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p.
2002
–2003
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The relative intensity noise of narrow linewidth DFB lasers in the vicinity of linewidth floors was measured. A strong correlation between linewidth rebroadening and a corresponding increase in the relative intensity noise for frequencies below 3 GHz was observed for devices with mode suppression ratios in excess of 35 dB.
Direct observation of shot noise in linewidth broadening of DBR lasers
- Author(s): H. Sundaresan and N.C. Fletcher
- Source: Electronics Letters, Volume 26, Issue 24, p. 2004 –2005
- DOI: 10.1049/el:19901295
- Type: Article
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p.
2004
–2005
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The relative intensity noise in DBR lasers has been measured as a function of the tuning current. Excellent correlation was found with the expected linewidth broadening, thus identifying shot noise in the passive regions to be the dominant mechanism. The noise spectrum peaks at around 300 MHz.
Cascadable current-mode single CCII biquads
- Author(s): S.-I. Liu ; H.-W. Tsao ; J. Wu
- Source: Electronics Letters, Volume 26, Issue 24, p. 2005 –2006
- DOI: 10.1049/el:19901296
- Type: Article
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p.
2005
–2006
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A new configuration for the realisation of current-mode single-CCII-biquad (SCB) filters with high output impedance is presented. It can synthesise lowpass, bandpass, highpass, notch, and allpass filtering functions with a single CCII connected to five passive RC one-port elements. The quality factor, Q, and the central frequency, ω0, of the proposed SCBs are insensitive to the current tracking error of the CCII. These SCBs have the advantages of low passive sensitivities and independently adjustable ω0 or Q
Effects of ice depolarisation on Ka-band satellite-Earth path in stratus rainfall events
- Author(s): Y. Maekawa ; N.S. Chang ; A. Miyazaki ; T. Segawa
- Source: Electronics Letters, Volume 26, Issue 24, p. 2006 –2008
- DOI: 10.1049/el:19901297
- Type: Article
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p.
2006
–2008
(3)
In stratus rainfall events, the effects of ice depolarisation are evaluated using the CS-2 beacon signal and X-band radar observations. Although the ice effects described in terms of the deviation from theoretical rain depolarisation show a large variation according to the rain height, net ice depolarisations deduced above this height are relatively constant.
All-optical loop mirror switch employing an asymmetric amplifier/attenuator combination
- Author(s): A.W. O'Neill and R.P. Webb
- Source: Electronics Letters, Volume 26, Issue 24, p. 2008 –2009
- DOI: 10.1049/el:19901298
- Type: Article
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p.
2008
–2009
(2)
For the first time a report is made on a loop mirror switch containing the nonreciprocal combination of a semiconductor laser amplifier and an optical attenuator. Self-routing of optical pulses has been demonstrated on 10 ns pulses with powers of <250 μW, within a 17 m loop. The model predicts the form of the switching.
Novel high precision alignment technique for polarisation maintaining fibres using a frequency modulated tunable laser
- Author(s): A. Ebberg and R. Noe
- Source: Electronics Letters, Volume 26, Issue 24, p. 2009 –2011
- DOI: 10.1049/el:19901299
- Type: Article
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p.
2009
–2011
(3)
A precision alignment technique for polarisation-maintaining fibres is described using a frequency modulated tunable laser in combination with phase sensitive detection. The effect of residual intensity modulation is overcome by detecting the signal at twice the modulation frequency. An alignment accuracy of better than 0.2° was achieved.
Multiple quantum well directional coupler as a self-electro-optic effect device
- Author(s): B.P. Keyworth ; M. Cada ; J.M. Glinski ; A.J. Springthorpe ; C. Rolland ; K.O. Hill
- Source: Electronics Letters, Volume 26, Issue 24, p. 2011 –2013
- DOI: 10.1049/el:19901300
- Type: Article
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p.
2011
–2013
(3)
Self-electro-optic effect devices (SEEDs) have recently received much attention due in part to their versatility and performance. However, the work to date has concentrated on electro-optic modulators which respond in some way to an optical signal. A report is made here on results obtained with a GaAs/AlGaAs multiple quantum well directional coupler configured as a SEED device. A robust optical switching operation is demonstrated with a high contrast ratio and constant output power.
Silicon implementation of a function of visual peripheral processes
- Author(s): H. Li and C.-H. Chen
- Source: Electronics Letters, Volume 26, Issue 24, p. 2013 –2015
- DOI: 10.1049/el:19901301
- Type: Article
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p.
2013
–2015
(3)
A silicon model for simulating a function of motion perception of the human visual peripheral processes is presented. It has a very high computation speed and is suitable for use in implementing a two-dimensional analog VLSI network for detecting motion.
Dielectric resonator antenna using aperture coupling
- Author(s): J.T.H.ST. Martin ; Y.M.M. Antar ; A.A. Kishk ; A. Ittipiboon ; M. Cuhaci
- Source: Electronics Letters, Volume 26, Issue 24, p. 2015 –2016
- DOI: 10.1049/el:19901302
- Type: Article
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p.
2015
–2016
(2)
A practical antenna configuration for use at microwave and millimetre wave frequencies is investigated. It consists of a circular cylindrical dielectric resonator fed by a microstrip feedline through a coupling aperture in the ground plane between them. Several elements, with different physical parameters, operating between 14 and 16GHz were constructed and tested. Experimental results confirm the effective and practical performance of the antenna structure.
5V, DC-12 GHz InP/InGaAs HBT amplifier
- Author(s): R.N. Nottenburg ; M. Banu ; B. Jalali ; D.A. Humphrey ; R.K. Montgomery ; R.A. Hamm ; M.B. Panish
- Source: Electronics Letters, Volume 26, Issue 24, p. 2016 –2018
- DOI: 10.1049/el:19901303
- Type: Article
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p.
2016
–2018
(3)
An InP/InGaAs HBT cascode amplifier operating from a single 5 V power supply is described. The circuit has a DC gain of 17.2 dB and a −3 dB frequency point of 12.3 GHz. This results in a gain-bandwidth product in excess of 90 GHz. The frequency response of the amplifier remains constant if the power supply voltage is as low as 4 V.
Comparison of DFB laser linewidth measurement techniques: results from COST 215 round robin
- Author(s): M.O. van Deventer ; P. Spano ; S.K. Nielsen
- Source: Electronics Letters, Volume 26, Issue 24, p. 2018 –2020
- DOI: 10.1049/el:19901304
- Type: Article
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p.
2018
–2020
(3)
An interlaboratory comparison on four different linewidth measurement techniques was performed for twelve DFB lasers from various manufacturers. The measured linewidths agreed very well for the lasers that had a flat frequency noise spectrum. Differences of more than a factor of 2 in measured linewidth for some of the other lasers could be explained by an increased level of the low frequency noise spectrum recognised by a Michelson interferometer. The conclusion was made that the application of the laser determines what is the best definition of linewidth and which is the best method for its measurement.
Construction of block modulation codes over rings for fading channels
- Author(s): B. Vucetic ; L. Zhang ; G. Khachatrian
- Source: Electronics Letters, Volume 26, Issue 24, p. 2020 –2022
- DOI: 10.1049/el:19901305
- Type: Article
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p.
2020
–2022
(3)
A new methodology is described for construction of block coded modulation (BCM) over modulo-8 rings for fading channels. Code construction criteria are defined to obtain the maximum use of channel characteristics and to achieve the phase invariance property. Some code examples are presented.
Measurement of intermodal coupling in weakly multimode fibre optics
- Author(s): S. Shaklan
- Source: Electronics Letters, Volume 26, Issue 24, p. 2022 –2024
- DOI: 10.1049/el:19901306
- Type: Article
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p.
2022
–2024
(3)
Using selective mode excitation via the cladding of an etched step-index weakly multimode fibre, and spatial mode separation at the output using a similarly etched section, intermodal coupling has been measured, mode-by-mode in the first seven guided modes of the fibre. Experimentally the observation has been made that most coupling terms remain less than −20dB after 500 m of fibre.
Digital passband filtering of megabaud transmitted data stream
- Author(s): C.A. Siller ; H.C. Reeve ; W. Debus
- Source: Electronics Letters, Volume 26, Issue 24, p. 2024 –2026
- DOI: 10.1049/el:19901307
- Type: Article
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p.
2024
–2026
(3)
A digital filter architecture for spectral shaping of a transmitted QAM signal is described. The technique requires that a binary representation for a finite sequence of multilevel symbols be interpreted as an address to memory that stores a pre-emphasised output that uniquely defines the desired transmitted transfer function. Design of a 6.34Mbaud 16-QAM filter is illustrated.
Residual and absolute timing jitter in actively mode-locked semiconductor lasers
- Author(s): D.J. Derickson ; A. Mar ; J.E. Bowers
- Source: Electronics Letters, Volume 26, Issue 24, p. 2026 –2028
- DOI: 10.1049/el:19901308
- Type: Article
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p.
2026
–2028
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The magnitude and origin of the pulse-to-pulse timing jitter that is added to the modulating source by an actively modelocked laser is discussed. Residual and absolute RMS timing jitter measurements as low as 50 fs and 170fs, respectively, have been measured in optimally tuned cavities.
Digital demodulation by a non-coherent differential PSK modem
- Author(s): S. Maslamani and M. Ghanbari
- Source: Electronics Letters, Volume 26, Issue 24, p. 2028 –2029
- DOI: 10.1049/el:19901309
- Type: Article
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p.
2028
–2029
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A DPSK demodulator which uses a digital delay line is presented. By digitising the demodulation process, the hardware design for the receiver is simplified. This also gives a greater flexibility to demodulate different carrier frequencies and data bit rates with the same receiver. The performance of the digital demodulator is compared with the theoretical values, for a range of error rates.
Compact low-voltage InGaAs/InAlAs multiple quantum well waveguide interferometers
- Author(s): J.E. Zucker ; K.L. Jones ; T.Y. Chang ; N. Sauer ; B. Tell ; K. Brown-Goebeler ; M. Wegener ; D.S. Chemla
- Source: Electronics Letters, Volume 26, Issue 24, p. 2029 –2031
- DOI: 10.1049/el:19901310
- Type: Article
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p.
2029
–2031
(3)
Semiconductor waveguide interferometric intensity modulators are demonstrated with a voltage-length product for 180° optical phase shift Vπ × L = 2.2 V mm.
Approximate expression for normalised throughput of multistage interconnection networks
- Author(s): T.-H. Lee and J.-J. Chou
- Source: Electronics Letters, Volume 26, Issue 24, p. 2031 –2033
- DOI: 10.1049/el:19901311
- Type: Article
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p.
2031
–2033
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An alternative formula is presented for the normalised throughput of unbuffered multistage interconnection networks (MINs). From the alternative formula, an approximate expression is derived. Numerical results show that the approximate expression can provide excellent estimates of the normalised throughputs. Moreover, the asymptotic performance of MINs can be determined as well.
Wavelength-tunable single-frequency and single-polarisation er-doped fibre ring-laser with 1.4 kHz linewidth
- Author(s): K. Iwatsuki ; H. Okamura ; M. Saruwatari
- Source: Electronics Letters, Volume 26, Issue 24, p. 2033 –2035
- DOI: 10.1049/el:19901312
- Type: Article
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p.
2033
–2035
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A narrow linewidth of 1.4 kHz with single frequency operation is demonstrated in an Er-doped fibre ring-laser. A stable lasing spectrum can be achieved using a single polarisation fibre-cavity. An optical bandpass filter incorporated in the ring-cavity makes the lasing wavelength tunable, and a 2.8 nm tuning range is demonstrated.
Strained-layer 1.5 μm wavelength InGaAs/InP multiple quantum well lasers grown by chemical beam epitaxy
- Author(s): W.T. Tsang ; M.C. Wu ; L. Yang ; Y.K. Chen ; A.M. Sergent
- Source: Electronics Letters, Volume 26, Issue 24, p. 2035 –2036
- DOI: 10.1049/el:19901313
- Type: Article
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p.
2035
–2036
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A substantial reduction is reported in the threshold current densities for 1.5 μm wavelength InxGa1−xAs/ InxGa1−xAs1−xPy, strained-layer multiple quantum well (SLMQW) lasers over lattice-matched MQW lasers. Threshold current density was found to depend sensitively on the InAs content x and thickness d of the InxGa1−xAs quantum wells. Threshold current densities as low as 370 A/cm2 and internal quantum efficiency of 90% were obtained for separate confinement heterostructure SL-MQW lasers having four quantum wells and with x = 0.65 and d = 5 nm. Such a threshold current density is among the lowest values obtained thus far for 1.5 μm wavelength InGaAs/lnGaAsP MQW lasers. The present lasers were grown by chemical beam epitaxy.
Noise reduction based on microphone array with LMS adaptive post-filtering
- Author(s): R. Zelinski
- Source: Electronics Letters, Volume 26, Issue 24, p. 2036 –2037
- DOI: 10.1049/el:19901314
- Type: Article
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p.
2036
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This letter presents a self-adapting noise reduction system which is based on a 4-microphone array combined with an adaptive Wiener filter. The LMS algorithm is used for adaptation. This filtering structure allows a simple implementation in the time domain on a sample-by-sample basis.
Femtosecond optical pulse generation using a distributed-feedback laser diode
- Author(s): M. Nakazawa ; K. Suzuki ; E. Yamada
- Source: Electronics Letters, Volume 26, Issue 24, p. 2038 –2040
- DOI: 10.1049/el:19901315
- Type: Article
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p.
2038
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Femtosecond optical pulses have been successfully generated for the first time using a distributed-feedback laser diode (DFB LD), erbium-doped optical fibre amplifiers, and the soliton narrowing effect in dispersion-shifted single-mode fibres. The DFB LD was gain-switched by a 500 MHz comb generator, and the pulse was converted into high power soliton pulses using a narrowband spectral windowing technique and the erbium amplifiers. With a three-stage soliton compression technique, 180–250 fs pulses with a peak power as high as 260 W were obtained. The average output power was 32mW.
Efficient systolic string matching
- Author(s): G.M. Megson
- Source: Electronics Letters, Volume 26, Issue 24, p. 2040 –2042
- DOI: 10.1049/el:19901316
- Type: Article
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p.
2040
–2042
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Two new string matching heuristics are presented which reduce the hardware requirement and improve the computation speed of the systolic string matcher due to Lipton and Lopresti1 The new array requires A = m/2 + n/2 −1 basic cells, T = m/2 + n/2 −1 + max (m, n) steps to match strings of size n and m,respectively, and has efficiency e = 1 (100%). A measure of the heuristic effectiveness compared with the minimum edit distance is also given
10 dB gain and high saturation power in a Nd3+-doped fluorozirconate fibre amplifier
- Author(s): T. Sugawa ; Y. Miyajima ; T. Komukai
- Source: Electronics Letters, Volume 26, Issue 24, p. 2042 –2044
- DOI: 10.1049/el:19901317
- Type: Article
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2042
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An optical gain as high as 10 dB is observed in an Nd3+-doped fluorozirconate fibre amplifier at the 1.343 μm wavelength by using simultaneous forward and backward pumping. Also, high saturation power characteristics are observed, and it may be possible to obtain a gain of 20 dB by cascading the doped fibre amplifiers and optimising fibre structure.
Automated adaptive hysteresis current control technique for a voltage-fed PWM inverter
- Author(s): D.S. Oh and M.J. Youn
- Source: Electronics Letters, Volume 26, Issue 24, p. 2044 –2046
- DOI: 10.1049/el:19901318
- Type: Article
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2044
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An adaptive hysteresis current control technique where the hysteresis band is automatically modulated by the input voltage integrator without the load information to maintain the modulation frequency nearly constant is presented. The computer simulation for the proposed current controller has been done and the results show good static and dynamic performances.
Companding current-mode integrator: A new circuit principle for continuous-time monolithic filters
- Author(s): E. Seevinck
- Source: Electronics Letters, Volume 26, Issue 24, p. 2046 –2047
- DOI: 10.1049/el:19901319
- Type: Article
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p.
2046
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A new companding current-mode (CI) integrator principle is proposed. The integrator function is linear despite being composed of nonlinear parts. Its application promises monolithic filters with improved noise performance suitable for low supply voltages. A class AB circuit implementation is proposed which features an extended dynamic range.
High-efficiency AlGaAs/InGaAs heterostructure FET oscillators at V-band
- Author(s): H.Q. Tserng and P. Saunier
- Source: Electronics Letters, Volume 26, Issue 24, p. 2048 –2049
- DOI: 10.1049/el:19901320
- Type: Article
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2048
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Quarter micron gate length heterostructure FETs used as oscillators have achieved record DC to RF conversion efficiencies at V-band. Devices with gatewidths of 50μm achieved an efficiency as high as 27% with output powers up to 20 mW in the 54 to 66 GHz frequency range.
Simple model for calculation of distortion in an optical analogue subcarrier multiplexed CATV system
- Author(s): J.H. Angenent
- Source: Electronics Letters, Volume 26, Issue 24, p. 2049 –2050
- DOI: 10.1049/el:19901321
- Type: Article
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p.
2049
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Composite triple beat and composite second order values of an arbitrary optical multichannel system are deduced from the results of two-tone measurements. The calculated results will be compared with results from measurements on multichannel systems.
Microstrip inversion transition
- Author(s): T.E. Kosicica
- Source: Electronics Letters, Volume 26, Issue 24, page: 2051 –2051
- DOI: 10.1049/el:19901322
- Type: Article
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p.
2051
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The structure described allows a microstrip top trace and ground plane to exchange roles. Empirical results are presented for the Ka-band (26.5–40.OGHz). Application ideas are discussed.
Line coding for very high speed LANs
- Author(s): D. Munoz-Rodriguez and J.B. Arevalo-Galarza
- Source: Electronics Letters, Volume 26, Issue 24, p. 2051 –2053
- DOI: 10.1049/el:19901323
- Type: Article
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2051
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Sub-byte oriented line coding schemes for high speed LAN environments are presented. The advantages of code interleaving are studied and improved line coding schemes of the 4B5B family suitable for local networks are proposed. Spectral performance of FDDI and new proposed line codes are also presented.
Strong dependence of time resolution on detector diameter in single photon avalanche diodes
- Author(s): A. Lacaita and M. Mastrapasqua
- Source: Electronics Letters, Volume 26, Issue 24, p. 2053 –2054
- DOI: 10.1049/el:19901324
- Type: Article
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p.
2053
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The fact that the time resolution of single photon avalanche diodes (SPADs) is mainly dependent on the size of the detector area is demonstrated. The larger the detector is, the worse the time resolution is. This result is related to the avalanche physics and sets the ultimate performance of these devices in single-photon timing.
‘Fibre/radio’ for the provision of cordless/mobile telephony services in the access network
- Author(s): A.J. Cooper
- Source: Electronics Letters, Volume 26, Issue 24, p. 2054 –2056
- DOI: 10.1049/el:19901325
- Type: Article
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p.
2054
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A four channel CT2 fibre/radio system has been demonstrated over singlemode fibre using subcarrier multiplexing techniques. A spurious free electrical dynamic range of 51 dB was achieved which is sufficient for a mobile range of approximately 100 m. The use of subcarrier multiplexing simplifies the design of the radio transceiver and allows complex processing equipment to be located at the local exchange.
Erratum: Generalised theory of a non-TEM transmission line taper without discontinuities
- Author(s): J.C. Coetzee and J.A.G. Malherbe
- Source: Electronics Letters, Volume 26, Issue 24, page: 2056 –2056
- DOI: 10.1049/el:19901326
- Type: Article
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