Online ISSN
1350-911X
Print ISSN
0013-5194
Electronics Letters
Volume 17, Issue 2, 22 January 1981
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 17, Issue 2
22 January 1981
100 km single mode VAD fibres
- Author(s): M. Kawachi ; S. Tomaru ; M. Yasu ; M. Horiguchi ; S. Sakaguchi ; T. Kimura
- Source: Electronics Letters, Volume 17, Issue 2, p. 57 –58
- DOI: 10.1049/el:19810041
- Type: Article
- + Show details - Hide details
-
p.
57
–58
(2)
100 km single mode fibres with low loss values of 0.3 dB/km at 1.55 μm and 0.5 dB/km at 1.3 μm have been made by the VAD method. Swept frequency 6 dB down bandwidths at the two wavelengths were 40 MHz for 100 km length and 800 MHz for 50 km length, respectively.
Analogue buffer memory for high speed rate conversion
- Author(s): G.F. Manes ; P. Tortoli ; D. Gerli ; C. Atzeni
- Source: Electronics Letters, Volume 17, Issue 2, p. 58 –59
- DOI: 10.1049/el:19810042
- Type: Article
- + Show details - Hide details
-
p.
58
–59
(2)
A new sampled data technique is introduced, capable of providing real-time spectral compression of large input bandwidths, while requiring a single sampling operation to be performed at the lower output data rate. The proposed configuration, based on a tapped delay line and CMOS integrated multiplexers, exhibits dual properties for spectral expansion; unique features are the capability of accepting data directly at RF format, with power consumption and switching speed requirements independent of the maximum processed data rate. Sampling rates as high as 25 MHz are demonstrated, requiring only 2.5 MHz tap switching frequency to be performed for a time compression factor of 10.
Double-layer acoustic antireflection coating for sapphire/water interface
- Author(s): J. Kushibiki and N. Chubachi
- Source: Electronics Letters, Volume 17, Issue 2, p. 59 –61
- DOI: 10.1049/el:19810043
- Type: Article
- + Show details - Hide details
-
p.
59
–61
(3)
Double-layer acoustic antireflection coating for the sapphire/water interface is experimentally and theoretically investigated in UHF range. By using the Au-SiO2 double layer with quarter wavelength thicknesses, the large transmission loss at the interface is almost completely reduced to be less than 0.1 dB at 600 MHz.
Submicron resolution deep UV photolithography
- Author(s): A.M. Voshchenkov and H. Herrmann
- Source: Electronics Letters, Volume 17, Issue 2, p. 61 –62
- DOI: 10.1049/el:19810044
- Type: Article
- + Show details - Hide details
-
p.
61
–62
(2)
A vacuum contact printing technique was used to evaluate the resolution limits of deep UV photolithography with a 300±30 nm exposure band. For the first time, an array of 200 chip sites containing 0.5 μm meander patterns 3 cm long was clearly resolved in AZ 2415 positive resist across 2 in diameter silicon wafers.
OTDR in monomode fibres at 1.3 μm using a semiconductor laser
- Author(s): P. Healey
- Source: Electronics Letters, Volume 17, Issue 2, p. 62 –64
- DOI: 10.1049/el:19810045
- Type: Article
- + Show details - Hide details
-
p.
62
–64
(3)
Optical time domain reflectometry (OTDR) in monomode optical fibre using a 1.3 μm semiconductor laser source is reported for the first time. A nonreflecting fibre defect may be accurately located at a range exceeding 17 dB one-way loss by observing the cessation of the Rayleigh backscattered signal.
Application of focusing method of index profiling to transition region of optical fibre preform
- Author(s): P.L. Chu and D. Peri
- Source: Electronics Letters, Volume 17, Issue 2, p. 64 –65
- DOI: 10.1049/el:19810046
- Type: Article
- + Show details - Hide details
-
p.
64
–65
(2)
The letter shows how the focusing method of measuring the refractive-index profile of an optical fibre preform can be modified to be applicable to the transition region of the preform. This involves adding a slit between the collimated source and the preform and measuring the scattered power distribution along the projection of the slit in the measurement plane.
Rapid interference suppression using Kalman filter approach
- Author(s): K. Krücker
- Source: Electronics Letters, Volume 17, Issue 2, p. 65 –67
- DOI: 10.1049/el:19810047
- Type: Article
- + Show details - Hide details
-
p.
65
–67
(3)
Directional interference suppression is based upon a recursive estimation procedure of the state of a filter generating the angular interference spectrum. This leads to an iterative solution of the Wiener-Hopf matrix equation. Simulation results compare the convergence rate of the proposed technique and the gradient method.
Stability test for two-dimensional recursive digital filters using inner determinants
- Author(s): A.H. Kayran and R.A. King
- Source: Electronics Letters, Volume 17, Issue 2, p. 67 –68
- DOI: 10.1049/el:19810048
- Type: Article
- + Show details - Hide details
-
p.
67
–68
(2)
A recently introduced stability criterion for two-dimensional digital filters is implemented by decision algebra. The proposed test takes the form of a local positivity test applied to a two-variable polynomial with real coefficients. Two non-trivial examples are given to illustrate the procedure.
Novel phase compensated 3-port VCVS without matched operational amplifiers
- Author(s): A.M. Soliman
- Source: Electronics Letters, Volume 17, Issue 2, p. 68 –69
- DOI: 10.1049/el:19810049
- Type: Article
- + Show details - Hide details
-
p.
68
–69
(2)
A new active phase compensated differential voltage controlled voltage source is given. The proposed network does not require matched operational amplifiers. Stability analysis based on the two-pole model of the operational amplifier is discussed.
Low loss high-density optical cable with nylon-extruded fibre units
- Author(s): K. Ishihara ; N. Uchida ; Y. Ishida ; Y. Sugawara ; M. Higashimoto
- Source: Electronics Letters, Volume 17, Issue 2, p. 69 –71
- DOI: 10.1049/el:19810050
- Type: Article
- + Show details - Hide details
-
p.
69
–71
(3)
A low loss, highly dense cable containing nylon-extruded six-fibre units was examined. Suitable unit parameters were determined by measuring loss increases with lateral force and at low temperature. 216-fibre cable was manufactured using the nylon-extruded units, and cabling loss increase was found to be only 0.1 dB/km.
System experiments using 1.3 μm LEDs
- Author(s): K. Ogawa ; E.L. Chinnock ; D. Gloge ; P. Kaiser ; S.R. Nagel ; S.J. Jang
- Source: Electronics Letters, Volume 17, Issue 2, p. 71 –72
- DOI: 10.1049/el:19810051
- Type: Article
- + Show details - Hide details
-
p.
71
–72
(2)
An experimental LED/PIN system is described that operates at 274 Mbit/s over 7.5 km or at 44.7 Mbit/s over 23.3 km without repeaters. These results are compared with repeater spans calculated for various loss and bandwidth conditions.
MIC IMPATT diode oscillator stabilised by temperature compensated dielectric resonator
- Author(s): G.B. Morgan and G.O. Obe
- Source: Electronics Letters, Volume 17, Issue 2, p. 72 –74
- DOI: 10.1049/el:19810052
- Type: Article
- + Show details - Hide details
-
p.
72
–74
(3)
Barium nonatitanate resonators offer simple microwave circuit designs for stabilised oscillators. An integrated circuit X-band IMPATT diode oscillator was designed and results are presented for both the stabilised and unstabilised oscillator. There was a considerable improvement in the stabilised oscillator spectrum and temperature sensitivity, e.g. the unstabilised oscillator had a line width of 0.5 MHz at 38 dB below the peak whereas the stabilised oscillator had a 0.5 MHz linewidth at 52 dB below the peak. The temperature sensitivity of the stabilised oscillator was ~40 kHz/°C over the range 0 to 60°C, which was about a third of that of the unstabilised oscillator.
Numerically stable algorithm for standard controllability form determination
- Author(s): A. Varga
- Source: Electronics Letters, Volume 17, Issue 2, p. 74 –75
- DOI: 10.1049/el:19810053
- Type: Article
- + Show details - Hide details
-
p.
74
–75
(2)
A procedure to determine the standard controllability form of a matricial pair (A, B), using orthogonal similarity transformations, is proposed. All rank computations are performed via singular value decompositions. The procedure can be used to test controllability of the pair (A, B) or in the model reduction of linear systems.
Experimental evaluation of bend radiation losses in millimetric dielectric waveguide
- Author(s): M.R. Inggs and N. Williams
- Source: Electronics Letters, Volume 17, Issue 2, p. 75 –76
- DOI: 10.1049/el:19810054
- Type: Article
- + Show details - Hide details
-
p.
75
–76
(2)
A crucial parameter in the design of compact dielectric waveguide integrated circuits is the minimum bend radius below which radiation losses become prohibitive. It is shown that, for waveguides with a relative permittivity of 10, values of bend radii down to four guide wavelengths are acceptable.
Phase-matched second harmonic generation and parametric mixing on nonlinear transmission lines
- Author(s): B. Wedding and D. Jäger
- Source: Electronics Letters, Volume 17, Issue 2, p. 76 –77
- DOI: 10.1049/el:19810055
- Type: Article
- + Show details - Hide details
-
p.
76
–77
(2)
Phase-matched parametric coupling between forward and backward waves on a high frequency transmission line is achieved by periodic nonlinearity. An efficiency of more than 90% in the case of frequency doubling is experimentally observed as well as parametric mixing and parametric amplification with a gain of nearly 30 dB.
Total reflection optical waveguide switch
- Author(s): H. Terui ; M. Kobayashi ; T. Kasai
- Source: Electronics Letters, Volume 17, Issue 2, p. 77 –79
- DOI: 10.1049/el:19810056
- Type: Article
- + Show details - Hide details
-
p.
77
–79
(3)
A waveguide switch based on the change in the total reflection critical angle caused by bringing a dielectric chip into contact with the waveguide surface was fabricated and a large switching angle of 22.5° for the TE0 mode was obtained.
Adjustable microstrip transformer for use with Josephson devices in mm-wave ICs
- Author(s): T.F. Finnegan and O.H. Soerensen
- Source: Electronics Letters, Volume 17, Issue 2, p. 79 –80
- DOI: 10.1049/el:19810057
- Type: Article
- + Show details - Hide details
-
p.
79
–80
(2)
A simple remotely adjustable cryogenic impedance transformer employing superconducting inverted microstrip circuits is described. The scheme is particularly suitable for efficiently coupling low impedance (0.1–5 Ω) thin-film devices (e.g. Josephson junctions) in planar microwave integrated circuits to waveguide or other superconducting and semiconducting devices at millimetre wavelengths. Preliminary results obtained at 8 mm are presented.
Microheater and microbolometer using microbridge of SiO2 film on silicon
- Author(s): M. Kimura
- Source: Electronics Letters, Volume 17, Issue 2, p. 80 –82
- DOI: 10.1049/el:19810058
- Type: Article
- + Show details - Hide details
-
p.
80
–82
(3)
Microbridges of SiO2 film, with a vacant space introduced by Si etching beneath each of them, are fabricated. As applications of the microbridge, Pt microheaters and Bi or Te microbolometers are made. These microheaters are able to heat up to over 800°C and have a thermal time constant τ of about 200 μs. At microbolometer with the same size microbridge as that of the microheater is estimated to have a responsivity Rs, and NEP of about 47 V/W and 6.47×10−11 WHz½ in a Bi bolometer, and of about 130 V/W and 7.8×10−11 WHz½ in a Te bolometer, and τ of about 300 μs, as determined by an illumination experiment using a HeNe laser.
MTI detection loss in clutter
- Author(s): D.C. Schleher
- Source: Electronics Letters, Volume 17, Issue 2, p. 82 –83
- DOI: 10.1049/el:19810059
- Type: Article
- + Show details - Hide details
-
p.
82
–83
(2)
The detection performance of a nonrecursive quadrature-channel MTI filter in Rayleigh and log-normal clutter is examined from a detection loss viewpoint. A formula is provided for detection loss in Rayleigh clutter whereas curves are provided for typical situations in log-normal clutter.
Transverse mode control in InGaAsP/InP buried crescent diode lasers
- Author(s): E. Oomura ; H. Higuchi ; R. Hirano ; H. Namizaki ; T. Murotani ; W. Susaki
- Source: Electronics Letters, Volume 17, Issue 2, p. 83 –84
- DOI: 10.1049/el:19810060
- Type: Article
- + Show details - Hide details
-
p.
83
–84
(2)
Transverse mode stabilisation of InGaAsP/InP buried crescent laser diodes emitting at 1.3 μm is described. Width and thickness of the active region have been reduced to stabilise the transverse mode. Operation up to 17 mW/facet in a stable transverse mode and threshold current as low as 12 mA in CW operation have been obtained.
Bidirectional fibre optic loop-structured network
- Author(s): Katsuyoshi Ito ; Yoshiaki Umeda ; Yasuo Sugiyama ; Kunio Nakajima ; Kazuyoshi Oshima ; Masahiro Nunoshita
- Source: Electronics Letters, Volume 17, Issue 2, p. 84 –86
- DOI: 10.1049/el:19810061
- Type: Article
- + Show details - Hide details
-
p.
84
–86
(3)
A basic bidirectional fibre optic loop-structured network configuration which provides an automatic recovery mechanism against a line failure and employs WDM-TDMA techniques for signal multiplexing is presented. Experimental results of a prototype of such a network are also described.
Voltage-controlled SAW filter on berlinite
- Author(s): J. Hénaff ; M. Feldmann ; M. Carel
- Source: Electronics Letters, Volume 17, Issue 2, p. 86 –87
- DOI: 10.1049/el:19810062
- Type: Article
- + Show details - Hide details
-
p.
86
–87
(2)
An electrically tunable narrow-bandwidth SAW filter described. This new device works similarly as a SAW voltage controlled oscillator. Because of stability requirements ar recent availability, experiments are reported on berlini (AlPO4) crystal.
High frequency microstrip branch-line coupler design with T-junction discontinuity compensation
- Author(s): M. Cuhaci and G.J.P. Lo
- Source: Electronics Letters, Volume 17, Issue 2, p. 87 –89
- DOI: 10.1049/el:19810063
- Type: Article
- + Show details - Hide details
-
p.
87
–89
(3)
A design procedure has been developed for high frequency microstrip branch-line couplers. The performance of these couplers is improved when T-junction discontinuity effects are compensated.
Ultra low bulk orientations of lithium niobate for SAW TV filters
- Author(s): R.F. Milsom ; R.J. Murray ; I. Flinn ; M. Redwood
- Source: Electronics Letters, Volume 17, Issue 2, p. 89 –91
- DOI: 10.1049/el:19810064
- Type: Article
- + Show details - Hide details
-
p.
89
–91
(3)
A range of orientations of lithium niobate substrates is shown both theoretically and experimentally to give very good rejection of spurious bulk wave signals in the stopband of a SAW TV filter and other SAW filters of similar bandwidth.
Laser based WDM multichannel video transmission system
- Author(s): J. Conradi ; R. Maciejko ; J. Straus ; I. Few ; G. Duck ; W. Sinclair ; A.J. Springthorpe ; J.C. Dyment
- Source: Electronics Letters, Volume 17, Issue 2, p. 91 –92
- DOI: 10.1049/el:19810065
- Type: Article
- + Show details - Hide details
-
p.
91
–92
(2)
The results of a WDM experiment involving the transmission of three video channels using AM-VSB modulation on each of three lasers in the 800–900 nm range are presented. A weighted video signal/noise ratio greater than 40 dB was achieved at each wavelength for a laser modulation index of 0.3 over a 1.1 km link.
VAD single mode fibre with 0.2 dB/km loss
- Author(s): S. Tomaru ; M. Yasu ; M. Kawachi ; T. Edahiro
- Source: Electronics Letters, Volume 17, Issue 2, p. 92 –93
- DOI: 10.1049/el:19810066
- Type: Article
- + Show details - Hide details
-
p.
92
–93
(2)
Transmission loss of VAD single mode fibres has been reduced to 0.35 dB/km at 1.3 μm and 0.2 dB/km at 1.55 μm by the thick cladding deposition and dehydration technique. The residual OH absorption loss is only 0.1 dB/km at 1.39 μm.
Time dependence of current at high electric fields in AlxGa1−xAs-GaAs heterojunction layers
- Author(s): M. Keever ; T. Drummond ; K. Hess ; H. Morkoc ; B.G. Streetman
- Source: Electronics Letters, Volume 17, Issue 2, p. 93 –94
- DOI: 10.1049/el:19810067
- Type: Article
- + Show details - Hide details
-
p.
93
–94
(2)
Measurements of the current/voltage characteristics of layered xGa1−xAs-GaAs heterostructures are presented. We show that under special circumstances surface acoustic waves can be amplified in these structures by surface acoustoelectric effects which might offer new device opportunities. In samples where the low field conduction occurs mainly in the GaAs, we observe at high fields short current peaks which we attribute to the modulation of the hot electron depletion layer width, which is consistent with the idea of real-space transfer.
Directional harmonics in Doppler effect
- Author(s): M.J. Lazarus ; M.G. Somekh ; S. Novak ; F.R. Pantoja
- Source: Electronics Letters, Volume 17, Issue 2, p. 94 –96
- DOI: 10.1049/el:19810068
- Type: Article
- + Show details - Hide details
-
p.
94
–96
(3)
A mathematical theory is presented which shows that a moving reflector of waves gives rise to harmonics of the Doppler shift in the input impedance of the transmission medium. The analysis can be used to explain new ‘direction of motion’ detection phenomena.
Mismatched filtering for coded aperture imaging with minimum sidelobes
- Author(s): P. Seidler
- Source: Electronics Letters, Volume 17, Issue 2, p. 96 –97
- DOI: 10.1049/el:19810069
- Type: Article
- + Show details - Hide details
-
p.
96
–97
(2)
The described method is a compromise between two-dimensional matched and inverse filtering and yields minimum sidelobes of the system point-spread function (SPSF) by the use of linear programming techniques. This SPSF is defined to be the reconstructed image resulting from coding a point source.
Truncation method of reduction: a viable alternative
- Author(s): Y. Smamash
- Source: Electronics Letters, Volume 17, Issue 2, p. 97 –99
- DOI: 10.1049/el:19810070
- Type: Article
- + Show details - Hide details
-
p.
97
–99
(3)
Recently published methods for generating stable reduced order models are compared with an old and very simple method of reduction based on the truncation of the high order system transfer function. Numerical examples show the truncation method, which requires no computation, to be as good as the other methods.
Coupling coefficient between dielectric resonator and microstrip line
- Author(s): P. Skalicky
- Source: Electronics Letters, Volume 17, Issue 2, p. 99 –100
- DOI: 10.1049/el:19810071
- Type: Article
- + Show details - Hide details
-
p.
99
–100
(2)
A new application of the method of electromagnetic field electrical excitation is shown for the purpose of calculation of the dielectric resonator and microstrip line coupling coefficient. Comparison between calculated and measured value of this coefficient shows good agreement.
Stripe waveguide Y-intersection as efficient coupler for multimode optical communication systems
- Author(s): A.D. de Oliveira ; M.G.F. Wilson ; O. Parriaux
- Source: Electronics Letters, Volume 17, Issue 2, p. 100 –101
- DOI: 10.1049/el:19810072
- Type: Article
- + Show details - Hide details
-
p.
100
–101
(2)
Multimode optical stripe waveguide Y-intersections were made by the ion-exchange process. A simple ray theory describes the variation of coupling with guide dimensions and intersection angle. Measurements at visible and infra-red wavelengths show good agreement with theory. The Y-coupler has application in fibre communication systems.
Analysis and design of DC blocks
- Author(s): S.R. Borgaonkar and S.N. Rao
- Source: Electronics Letters, Volume 17, Issue 2, p. 101 –103
- DOI: 10.1049/el:19810073
- Type: Article
- + Show details - Hide details
-
p.
101
–103
(3)
Four types of microstrip coupled line DC blocks are analysed and expressions for the theoretically possible maximum bandwidth for a given ripple are derived. A procedure for designing a DC block to meet a given set of ripple and bandwidth specifications is indicated.
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
