Online ISSN
1350-911X
Print ISSN
0013-5194
Electronics Letters
Volume 5, Issue 7, 3 April 1969
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Volume 5, Issue 7
3 April 1969
Measurement of the coupling efficiency between dielectric-loaded rectangular waveguides and dielectric-loaded trough waveguides
- Author(s): N.B. Saddler and J.A. Staniforth
- Source: Electronics Letters, Volume 5, Issue 7, p. 131 –132
- DOI: 10.1049/el:19690098
- Type: Article
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The measurement of the coupling efficiency between a dielectric-loaded rectangular waveguide and a dielectric-loaded trough waveguide is described, and the results are compared with theoretical estimates.
Method dealing with the experimental determination of the hyperabrupt-junction varactor characteristics
- Author(s): J. Bajon ; J.C. Hoffmann ; J.R. Hait
- Source: Electronics Letters, Volume 5, Issue 7, p. 132 –134
- DOI: 10.1049/el:19690099
- Type: Article
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An experimental method used for the accurate determination of the differential capacitance C of the diffusion voltage Φ and of the exponent α of a varactor is proposed. The data processing of the experimental results in a numerical way allows independence from the parasitic capacitance. The accuracy which has been achieved is higher than 2 × 10−3 for the determination of C, and higher than 4 × 10−2 for the determination of Φ.
Piezoelectric generation and detection of ultrasonic surface waves by interdigital electrodes: an electrical equivalent circuit
- Author(s): T. Krairojananan and M. Redwood
- Source: Electronics Letters, Volume 5, Issue 7, p. 134 –135
- DOI: 10.1049/el:19690100
- Type: Article
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Experiments with voltage pulses applied to an interdigital array of electrodes on the surface of a piezoelectric material suggest a 1-dimensional electrical equivalent circuit valid for generation and detection of ultrasonic surface waves, both transient and sinusoidal. The study also indicates a new method of assessing the piezoelectric coupling coefficient.
Comment: Solution of the Lyapunov matrix equation with a diagonal input matrix, obtained without matrix inversion
- Author(s): H.M. Power
- Source: Electronics Letters, Volume 5, Issue 7, p. 135 –136
- DOI: 10.1049/el:19690101
- Type: Article
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An apparent restriction on the validity of a scheme for solving the Lyapunov matrix equation is removed.
Optimised frequency multipliers using an ideal step-recovery diode without idlers
- Author(s): R.H. Johnston
- Source: Electronics Letters, Volume 5, Issue 7, p. 136 –137
- DOI: 10.1049/el:19690102
- Type: Article
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A generalised computer analysis on step-racovery-diode frequency multipliers (idlerless) determines optimum efficiencies and conditions under which these occur.
Simple ultra-lowpass filter (diode brake)
- Author(s): D. Wuchinich
- Source: Electronics Letters, Volume 5, Issue 7, p. 137 –139
- DOI: 10.1049/el:19690103
- Type: Article
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A circuit is described that uses two point-contact diodes and a capacitor to remove frequency content down to 0.1 Hz or lower, while transferring d.c. signal levels at low impedance and without loss. To operate, the filter requires a moderately high load impedance and input-signal amplitude variations of at least 100mV.
Active reactance compensation of parametric amplifiers
- Author(s): C.S. Aitchison and J.C. Williams
- Source: Electronics Letters, Volume 5, Issue 7, p. 139 –140
- DOI: 10.1049/el:19690104
- Type: Article
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The increase in bandwidth potential of a simple parametric amplifier obtained by adding active rather than passive filter elements to the signal circuit is discussed. Measured performance data of an amplifier constructed for the 4GHz satellite-communication band is given; by using this technique, a sevenfold increase in bandwidth at 20dB gain was obtained
Perturbation analysis in dielectric-loaded waveguides
- Author(s): S.C. Kashyap and M.A.K. Hamid
- Source: Electronics Letters, Volume 5, Issue 7, p. 140 –141
- DOI: 10.1049/el:19690105
- Type: Article
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Richter, Diament and Schlesinger's perturbation analysis is applied to deal with rectangular waveguides loaded with one or more dielectric slabs. It is shown, contrary to Richter's conclusion, that the theory can lead to reasonable results even in the situations where it was predicted to fail.
New technique for digital phase-shift control
- Author(s): A.L. Cullen
- Source: Electronics Letters, Volume 5, Issue 7, p. 141 –142
- DOI: 10.1049/el:19690106
- Type: Article
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A scheme for digital phase-shift control of a locked oscillator is proposed. If the required operating frequency is f and the locking frequency is nf, a reversal in phase of the locking frequency will shift the phase of the locked oscillator by π/n, under suitable conditions.
Decomposition of time-varying LC elements and the state-space formulation
- Author(s): T. Murata
- Source: Electronics Letters, Volume 5, Issue 7, p. 142 –143
- DOI: 10.1049/el:19690107
- Type: Article
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The letter presents a method of decomposing nonlinear time-varying reactive elements into the resistive part and the remaining reactive part. This decomposition makes it possible to get the state-space formulation of nonlinear time-varying networks as for a linear case.
General principle of electrical equivalence for nonuniform transmission lines
- Author(s): A.G.J. Holt and K.U. Ahmed
- Source: Electronics Letters, Volume 5, Issue 7, p. 143 –144
- DOI: 10.1049/el:19690108
- Type: Article
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The criterion of electrical equivalence for nonuniform transmission lines, introduced by Hellstrom, has recently been interpreted in a more general form. The letter presents the electrical-equivalence principle' in a simple manner. It is shown that any nonuniform RC (or LC) line may be made electrically equivalent to another RC (or LC) line, if the physical lengths of the two lines are properly chosen.
Power spectrum of a pulse train specified by its probability-generating function
- Author(s): V. Teodosić
- Source: Electronics Letters, Volume 5, Issue 7, p. 144 –146
- DOI: 10.1049/el:19690109
- Type: Article
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A stationary stochastic train of nonoverlapping pulses is considered, and a link is established between the conditional probability density pk(τ) for the appearance of k successive count-to-count intervals during the time interval τ, assuming that the first count-to-count interval has begun (with the first pulse) at t = 0, and that the kth interval has ended (with the last pulse) at t = τ, and the probability Gj(τ) that j successive pulses of this train will appear during the same time interval τ (supposing that the initial time t = 0 has been selected at random). If the train considered consists of identical unit pulses, it is also possible to relate to Gj(τ) its autocorrelation function R(τ), as well as its power density P(ω).
Stability of a sinusoidal-perturbation extremal-control system
- Author(s): O.L.R. Jacobs and G.C. Shering
- Source: Electronics Letters, Volume 5, Issue 7, p. 146 –147
- DOI: 10.1049/el:19690110
- Type: Article
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The stability is considered of a single-input sinusoidal-perturbation extermal-control system with output lag. The stability boundary of the system is discussed, and some experimental results about its shape are presented.
Transmission system with cascade phase modulation by dividing the baseband spectrum into subbands
- Author(s): G. Cartianu and A. Popea
- Source: Electronics Letters, Volume 5, Issue 7, p. 147 –149
- DOI: 10.1049/el:19690111
- Type: Article
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In the proposed system, the baseband spectrum is divided into several subbands; each subband phase-modulates the carrier, by means of modulators in cascade, in a multiplication chain. This system allows the use of indirect frequency modulation for signals such as the stereophonic signal, the multiplex-telephone signal and the video-frequency signal.
Waveform transmission with permutation modulation
- Author(s): E. Biglieri ; V. Castellani ; M. Pent
- Source: Electronics Letters, Volume 5, Issue 7, p. 149 –151
- DOI: 10.1049/el:19690112
- Type: Article
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The permutation-modulation scheme proposed by Slepian is applied to waveform transmission. The system performances are described in terms of output signal-to-noise ratio, and a comparison is made with a p.c.m./f.s.k. system.
Low-frequency negative resistance of X band Gunn diodes
- Author(s): G.A. Brunt
- Source: Electronics Letters, Volume 5, Issue 7, p. 151 –153
- DOI: 10.1049/el:19690113
- Type: Article
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A u.h.f. oscillator utilising an X band Gunn diode is described. The output power is discontinuous with frequency, and is obtained only when two X band frequencies separated by the u.h.f. are supported. This provides evidence for the nature of the low-frequency negative resistance of the diode.
Dynamic characteristics of a mutually synchronised system
- Author(s): T. Saito and H. Yasuda
- Source: Electronics Letters, Volume 5, Issue 7, p. 153 –154
- DOI: 10.1049/el:19690114
- Type: Article
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Small-signal and large-signal transient responses of mutually synchronised systems are described Theoretical analyses, as well as experimental checks, are performed on these characteristics, and the system design parameters are obtained.
Systematic method of calculating the amplitude spectra of waveform sequences
- Author(s): W.M.S. Liew and R.C.V. Macario
- Source: Electronics Letters, Volume 5, Issue 7, p. 155 –156
- DOI: 10.1049/el:19690115
- Type: Article
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A systematic method of deriving the amplitude spectra of periodic pulse sequences, pseudonoise or otherwise, is described. The spectrum of a 5-level msequence is calculated as an example.
Microwave-frequency synthetisers
- Author(s): R.C. Hamer
- Source: Electronics Letters, Volume 5, Issue 7, p. 156 –157
- DOI: 10.1049/el:19690116
- Type: Article
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A new type of microwave-frequency synthetiser, suitable for use in digitally tuned u.h.f. and microwave superheterodyne receivers (and possibly also signal generators), is described. The method is based on phase locking a voltage-tuned transistor oscillator to successive harmonics of a fundamental crystal oscillator, resulting in an all solid-state design capable of operation up to Xband. Early experimental work on a u.h.f. synthetiser is noted, and basic functional diagrams are provided.
Contraction-mapping fixed-point theorem and finite-time stability
- Author(s): J.S. Krikorian and T.A. Bickart
- Source: Electronics Letters, Volume 5, Issue 7, p. 157 –158
- DOI: 10.1049/el:19690117
- Type: Article
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The contraction-mapping fixed-point theorem is utilised to obtain information on the finite-time stability of a class of nonlinear time-varying single-loop control systems. The loop of a system, from the class of systems investigated, consists of an operator which satisfies a Lipschitz condition in tandem with a time-invariant linear causal convolution operator.
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