Online ISSN
1350-911X
Print ISSN
0013-5194
Electronics Letters
Volume 19, Issue 18, 1 September 1983
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 19, Issue 18
1 September 1983
Performance of two tripole arrays as frequency-selective surfaces
- Author(s): J.C. Vardaxoglou and E.A. Parker
- Source: Electronics Letters, Volume 19, Issue 18, p. 709 –710
- DOI: 10.1049/el:19830482
- Type: Article
- + Show details - Hide details
-
p.
709
–710
(2)
The current distribution along the arms of tripoles arranged on two equilateral triangular lattices has been computed and shown to have a simple cosinusoidal form. Calculated and measured transmission curves agree closely and give band spacings ≳2:1. The crosspolar performance in a 45°-incidence diplexer is lattice-dependent.
Residually excited LPC processor for enhancing helium speech intelligibility
- Author(s): G. Duncan and M.A. Jack
- Source: Electronics Letters, Volume 19, Issue 18, p. 710 –711
- DOI: 10.1049/el:19830483
- Type: Article
- + Show details - Hide details
-
p.
710
–711
(2)
A new approach to restoring the intelligibility of divers' speech uttered in a high-pressure atmosphere containing high percentages of helium gas is presented. The system processing architecture consists of a residually excited linear predictive coder (RELPC) with a novel implementation of time/frequency-domain relationships to simplify processing.
Sets of complementary sequences
- Author(s): D.V. Sarwate
- Source: Electronics Letters, Volume 19, Issue 18, p. 711 –712
- DOI: 10.1049/el:19830484
- Type: Article
- + Show details - Hide details
-
p.
711
–712
(2)
A set of complementary sequences is a set of sequences such that, for each nonzero offset, the out-of-phase aperiodic autocorrelations of all the sequences sum to zero. It is shown that the sequences from any coset of an (N, m) nondegenerate minimal linear cyclic code over GF(p) form a set of complex-valued complementary sequences of length N.
Constraints for fundamental-mode spot size for broadband dispersion-compensated single-mode fibres
- Author(s): K. Petermann
- Source: Electronics Letters, Volume 19, Issue 18, p. 712 –714
- DOI: 10.1049/el:19830485
- Type: Article
- + Show details - Hide details
-
p.
712
–714
(3)
Constraints exist for the fundamental-mode spot size for broadband dispersion-compensated fibres because of the relationship between dispersion and spot size. Dispersion compensation between 1.3 and 1.55 μm is still possible with the usual spot radius of about 5 μm at λ = 1.3 μm, while dispersion compensation between 1.3 and 1.8 μm would require a spot radius of less than 4 μm.
Reduced long-range signal reception with leaky feeders
- Author(s): A.J. Motley and D.A. Palmer
- Source: Electronics Letters, Volume 19, Issue 18, p. 714 –715
- DOI: 10.1049/el:19830486
- Type: Article
- + Show details - Hide details
-
p.
714
–715
(2)
The reception of long-range signals, at various radio frequencies, by a leaky feeder laid around a building is compared with that from an aerial carried over the same route. This highlights an advantage in using leaky feeders to reduce long-range interference to cordless communication in buildings.
1.5 GHz operation of an AlxGa1−xAs/GaAs modulation-doped photoconductive detector
- Author(s): Y.M. Pang ; C.Y. Chen ; P.A. Garbinski
- Source: Electronics Letters, Volume 19, Issue 18, p. 716 –717
- DOI: 10.1049/el:19830487
- Type: Article
- + Show details - Hide details
-
p.
716
–717
(2)
We demonstrate a planar AlxGa1−xAs/GaAs modulation-doped photoconductive detector operating at frequencies up to 1.5 GHz. This detector exhibits a peak responsivity of 2 A/W at these operating conditions, which corresponds to a gain of 3. We found that the peak responsivity increased with reduced pulse repetition rates, reaching 5 A/W at 1 MHz. We also measured the noise power at 800 MHz. This investigation suggests that the detector can be useful for shortwavelength (λ ≅ 0.82 μm) giga-bit-rate integrated photoreceiver applications.
Tunnelling in aluminium/aluminium-oxide/palladium junctions: hydrogen-induced variations
- Author(s): A. Diligenti and M. Stagi
- Source: Electronics Letters, Volume 19, Issue 18, p. 717 –718
- DOI: 10.1049/el:19830488
- Type: Article
- + Show details - Hide details
-
p.
717
–718
(2)
The tunnel current of aluminium/aluminium-oxide/palladium (Al/Al2O3/Pd) junctions, obtained by means of sapphire sputtering, has been measured in air and in hydrogen-nitrogen atmosphere at various H2 concentrations ranging from 2 to 100% and at room temperature. It has been found that the tunnel current undergoes a significant change as a consequence of Pd work function lowering induced by the hydrogen. The ratio between the tunnel current in H2 and in air has a value in the range 102−106, depending on the oxide thickness. The increase of the current occurs in some hundreds of milliseconds if the hydrogen is emitted at atmospheric pressure.
Two's complement extension of a parallel binary division by ten
- Author(s): F.E. Petry
- Source: Electronics Letters, Volume 19, Issue 18, p. 718 –720
- DOI: 10.1049/el:19830489
- Type: Article
- + Show details - Hide details
-
p.
718
–720
(3)
A division of binary numbers by ten is extended to negative numbers in a two's complement form. The analysis of these negative remainder cases has allowed a more uniform, general approach to the remainder detection problem and should permit an extension to division by other constants.
Simplified linearly polarised contoured beam reflector antenna for a European coverage requirement
- Author(s): G.A.E. Crone and A.G. Roederer
- Source: Electronics Letters, Volume 19, Issue 18, p. 720 –722
- DOI: 10.1049/el:19830490
- Type: Article
- + Show details - Hide details
-
p.
720
–722
(3)
The design of a linearly polarised contoured beam reflector antenna for a European coverage requirement is described. The antenna is a 1.1 m offset reflector, fed by an array of only five rectangular feed horns, operating in a 10.7–11.7 GHz band. The minimum gain requirement of 28 dBi for the contoured beam, in contrast to the current ECS-1 CEPT (Conference Europeenne de Poste et Telecommunication) elliptical Eurobeam gain requirement of 25 dBi, is achieved.
Applicability of the relay correlator to radar signal processing
- Author(s): S. Cacopardi
- Source: Electronics Letters, Volume 19, Issue 18, p. 722 –723
- DOI: 10.1049/el:19830491
- Type: Article
- + Show details - Hide details
-
p.
722
–723
(2)
The relay estimator for evaluating the autocorrelation coefficients of a zero-mean stationary Gaussian process is characterised by a very low computational cost. This feature is particularly attractive in radar applications. In the letter its performance, for uncorrelated and correlated pairs of samples, is investigated and compared with that of the conventional estimator.
Coupled-wave theory regarding phase-locked-array lasers
- Author(s): K. Otsuka
- Source: Electronics Letters, Volume 19, Issue 18, p. 723 –725
- DOI: 10.1049/el:19830492
- Type: Article
- + Show details - Hide details
-
p.
723
–725
(3)
The phase relationship between adjacent emitters of coupled-waveguide lasers has been derived based on coupled-wave theory. An interesting analogy between phase-locked array lasers and FM mode-locked lasers is shown to exist theoretically.
False-alarm probabilities for a log-t detector in k-distributed clutter
- Author(s): A. Jakubiak
- Source: Electronics Letters, Volume 19, Issue 18, p. 725 –726
- DOI: 10.1049/el:19830493
- Type: Article
- + Show details - Hide details
-
p.
725
–726
(2)
Dependence of the false-alarm probability PFA on K-distributed clutter parameters for a log-t detector is presented. The results for a finite number of clutter samples, N, were obtained by using Monte Carlo simulation. In a case where N tends to infinity, an analytical form for PFA is given.
Equivalence between circular and rectangular posts in guiding structures
- Author(s): M.E. Bialkowski and P.J. Khan
- Source: Electronics Letters, Volume 19, Issue 18, p. 726 –728
- DOI: 10.1049/el:19830494
- Type: Article
- + Show details - Hide details
-
p.
726
–728
(3)
An accurate approximation is found to the impedance of a circular-post diode mount in a millimetre-wave guiding structure, through determination of the equivalence between a circular post and a rectangular post in such structures.
InxGa1−xAs-epitaxy with metalorganic adducts
- Author(s): P. Speier ; F. Scholz ; K.W. Benz ; H. Renz ; J. Weidlein
- Source: Electronics Letters, Volume 19, Issue 18, p. 728 –729
- DOI: 10.1049/el:19830495
- Type: Article
- + Show details - Hide details
-
p.
728
–729
(2)
Two metalorganic adducts (trimethylindium-trimethylarsine (CH3)3In-As(CH3)3 and trimethylgallium-trimethylarsine (CH3)3Ga-As(CH3)3) have been used for the epitaxial growth of InxGa1−xAs on InP, and GaAs, substrates at normal pressure. Epitaxial layers with net carrier concentrations of n = 2 × 1016 cm−3, μ300K = 6600 cm2/Vs (In0.53Ga0.47As/InP) and n′ = 1 × 1016 cm−3, μ′ = 3200 cm2/Vs (In0.2Ga0.8As/GaAs) have been grown.
Systolic array for recursive least-squares minimisation
- Author(s): J.G. McWhirter
- Source: Electronics Letters, Volume 19, Issue 18, p. 729 –730
- DOI: 10.1049/el:19830496
- Type: Article
- + Show details - Hide details
-
p.
729
–730
(2)
A systolic array for performing recursive least-squares minimisation is described. It performs an orthogonal triangularisation of the data matrix using a sequence of Givens rotations, and generates the required residual without having to solve the associated triangular linear system by back-substitution. Since the back-substitution process may be ill conditioned and numerically unstable, the reliability and robustness of the method is greatly improved as a result, whilst the amount of circuitry and computation is reduced.
Hydraulic waveguide flange clamp for precision measurements
- Author(s): R.H. Johnson and D. Harvey
- Source: Electronics Letters, Volume 19, Issue 18, p. 730 –731
- DOI: 10.1049/el:19830497
- Type: Article
- + Show details - Hide details
-
p.
730
–731
(2)
A compact quick-release hydraulic waveguide flange clamp is described which is at least four times faster than the usual flange nuts and bolts used to assemble and disassemble waveguide components during precision measurements. An integral pressure gauge ensures repeatability of the clamping force.
Near-field measurements in monomode fibres: determination of chromatic dispersion
- Author(s): G. Coppa ; P. di Vita ; M. Potenza ; U. Rossi
- Source: Electronics Letters, Volume 19, Issue 18, p. 731 –733
- DOI: 10.1049/el:19830498
- Type: Article
- + Show details - Hide details
-
p.
731
–733
(3)
A new dispersion measurement for monomode fibres is proposed. It is based on an elaboration of the near-field intensities at different wavelengths. The measurement is considerably simplified and the results are highly accurate.
Current oscillations in semiconductor diodes under streaming instability conditions
- Author(s): V. GruŽinskis and A. Reklaitis
- Source: Electronics Letters, Volume 19, Issue 18, p. 733 –734
- DOI: 10.1049/el:19830499
- Type: Article
- + Show details - Hide details
-
p.
733
–734
(2)
The current oscillations with frequency of the order of plasma frequency in the submicron GaAs n+-n-p-p+ structure are obtained by Monte Carlo particle simulation. The streaming plasma instability responsible for the current oscillations at near ballistic transport conditions is shown.
Parameters of coplanar waveguides with lower ground plane
- Author(s): G. Ghione and C. Naldi
- Source: Electronics Letters, Volume 19, Issue 18, p. 734 –735
- DOI: 10.1049/el:19830500
- Type: Article
- + Show details - Hide details
-
p.
734
–735
(2)
A new analytical expression for the impedance and the permittivity of coplanar waveguides with lower ground plane is presented. Although approximate in principle, this expression shows very good agreement with the upper or lower bounds of the parameters, computed via a spectral-domain variational approach.
Buffers with stochastic output interruptions
- Author(s): H.L. Bruneel
- Source: Electronics Letters, Volume 19, Issue 18, p. 735 –737
- DOI: 10.1049/el:19830501
- Type: Article
- + Show details - Hide details
-
p.
735
–737
(3)
A discrete-time buffer system with one randomly interrupted output channel is considered. It is shown how relationships can be found between the probability generating functions of the buffer occupancy (expressed in number of messages) at various time instants. The use of these relationships is illustrated.
Far field radiated by short-circuited microstrip antenna acting at a quarter-wavelength resonance
- Author(s): G. Dubost
- Source: Electronics Letters, Volume 19, Issue 18, p. 737 –739
- DOI: 10.1049/el:19830502
- Type: Article
- + Show details - Hide details
-
p.
737
–739
(3)
Using electric and polarisation current distributions, known from transmission-line-model analysis, we have determined the far field radiated by a short-circuited rectangular microstrip antenna acting at a quarter-wavelength resonance. An experimental verification for such a radiating strip wrapped around a conducting cylinder is given.
Direct observation of visibility curve of semiconductor lasers
- Author(s): W. Eickhoff ; E. Brinkmeyer ; H. Barfuβ
- Source: Electronics Letters, Volume 19, Issue 18, p. 739 –740
- DOI: 10.1049/el:19830503
- Type: Article
- + Show details - Hide details
-
p.
739
–740
(2)
A method for the determination of the linewidth of semiconductor lasers is demonstrated. It employs tuning of the laser frequency, observation of the backscattered light from a single-mode fibre and Fourier-transform evaluation.
Temperature stability of surface-generated bulk waves
- Author(s): M. Goodberlet ; D.L. Lee ; J.F. Vetelino
- Source: Electronics Letters, Volume 19, Issue 18, p. 740 –741
- DOI: 10.1049/el:19830504
- Type: Article
- + Show details - Hide details
-
p.
740
–741
(2)
Theoretical and experimental analyses have been performed on the temperature stability of a new type of bulk-wave device in which the signal is launched and received by a pair of interdigital transducers located on one surface of a Y-cut quartz crystal. Excellent temperature stability is obtained.
Highly stable FET DROs using new linear dielectric resonator material
- Author(s): C. Tsironis and D. Hennings
- Source: Electronics Letters, Volume 19, Issue 18, p. 741 –743
- DOI: 10.1049/el:19830505
- Type: Article
- + Show details - Hide details
-
p.
741
–743
(3)
New low-loss dielectric materials for dielectric resonator oscillators (DROs) have been developed. The new barium titanate material has positive and constant stability factor (3 to 10 ppm/K) and quality factors of about 2500. The achieved frequency drift of GaAs FET DROs using dielectric resonators made from the new material over −30 to 80°C is of the order of 150 to 200 kHz at 10.9 GHz.
Transmission loss increase in optical fibres due to hydrogen permeation
- Author(s): K. Mochizuki ; Y. Namihira ; H. Yamamoto
- Source: Electronics Letters, Volume 19, Issue 18, p. 743 –745
- DOI: 10.1049/el:19830506
- Type: Article
- + Show details - Hide details
-
p.
743
–745
(3)
The experiment of soaking the optical fibre cable in water is carried out. As a result, a tremendously large transmission loss increase is observed at 1.24 μm. Through a fundamental experiment, it is shown that hydrogen permeation causes the transmission loss increase in optical fibres.
Integrable tunable sinusoid oscillator using DVCCS
- Author(s): A.R. Saha ; R. Nandi ; S. Nandi
- Source: Electronics Letters, Volume 19, Issue 18, p. 745 –746
- DOI: 10.1049/el:19830507
- Type: Article
- + Show details - Hide details
-
p.
745
–746
(2)
A novel RC-sinewave oscillator configuration using the differential voltage controlled current source (DVCCS) active element is proposed. It has only two resistors and two grounded capacitors. The oscillation frequency can be tuned independently by one resistor at low sensitivities. The circuit has an additional capability of realising active lossless grounded inductors at appropriate ports if any of the capacitors is open-circuited.
Positive and negative charge generation by hot carriers in n-MOSFETs
- Author(s): B. Borchert ; K.R. Hofmann ; G. Dorda
- Source: Electronics Letters, Volume 19, Issue 18, p. 746 –747
- DOI: 10.1049/el:19830508
- Type: Article
- + Show details - Hide details
-
p.
746
–747
(2)
By means of the charge pumping (CP) method the degradation effects in the oxide near drain have been sensitively investigated. Both negative and positive charges have been observed together with their distribution. These results can be explained by the two-dimensional electric-field configuration near drain.
Simple method for computation of Wiener-Lee decomposition
- Author(s): C.P. Kwong
- Source: Electronics Letters, Volume 19, Issue 18, p. 747 –748
- DOI: 10.1049/el:19830509
- Type: Article
- + Show details - Hide details
-
p.
747
–748
(2)
A simple method using efficient algorithms is proposed for the computation of Wiener—Lee decomposition which has found applications in network synthesis, digital-filter design and inversion of Laplace transforms.
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
