Online ISSN
1350-911X
Print ISSN
0013-5194
Electronics Letters
Volume 8, Issue 25, 14 December 1972
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Volume 8, Issue 25
14 December 1972
Class of stepped-reflector antennas with improved frequency response
- Author(s): G.T. Poulton
- Source: Electronics Letters, Volume 8, Issue 25, p. 605 –606
- DOI: 10.1049/el:19720439
- Type: Article
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p.
605
–606
(2)
The analysis of stepped-reflector antennas has been extended to the case where the basic shape of the reflector is other than spherical. It is shown that an improvement in frequency response may be obtained at the expense of the scanning performance of the antenna.
Microwave-emission spectrm from large samples of gallium arsenide in which TEM waves experience round-trip gain
- Author(s): A.C. Baynham
- Source: Electronics Letters, Volume 8, Issue 25, p. 606 –608
- DOI: 10.1049/el:19720440
- Type: Article
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p.
606
–608
(3)
Broad microwave emission spectra have been reported when round-trip gain exists for electromagnetic waves within the cavity formed by a specimen's boundaries. In this letter, we describe observations which demonstrate that the intrinsic linewidth is in fact very small, but that the emission frequency is highly electric-field dependent.
Higher-order evanescent modes on slow-wave structures
- Author(s): A.J. Sangster and B.O. Maher
- Source: Electronics Letters, Volume 8, Issue 25, p. 608 –609
- DOI: 10.1049/el:19720441
- Type: Article
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p.
608
–609
(2)
By employing suitable mathematical models, the higher-order evanescent modes on two common slow-wave systems are discussed. It is shown that these closely resemble corresponding modes on related plane-waveguide or coaxial-line structures.
Calculation of input-voltage standing-wave ratio for a reflector antenna
- Author(s): G.T. Poulton ; S.H. Lim ; P.H. Masterman
- Source: Electronics Letters, Volume 8, Issue 25, p. 610 –611
- DOI: 10.1049/el:19720442
- Type: Article
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p.
610
–611
(2)
A simple method is presented for the calculation of the energy reabsorbed by the feed in an antenna system. The method is applied to determine the v.s.w.r. when a dielectric-cone feed is used to illuminate a subreflector.
Realisation of 2nd-order transfer function using a minimum number of elements
- Author(s): Fuat Anday
- Source: Electronics Letters, Volume 8, Issue 25, p. 611 –612
- DOI: 10.1049/el:19720443
- Type: Article
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p.
611
–612
(2)
A signal-flowgraph procedure which generates minimal 2nd-order networks is outlined, and some active networks realising 2nd-order transfer functions with a single operational amplifier and using a minimum number of passive components are given.
Input impedance of a thin biconical antenna vertically buried near the air–ground interface
- Author(s): P. Degauque ; J. Fontaine ; R. Gabillard
- Source: Electronics Letters, Volume 8, Issue 25, p. 612 –614
- DOI: 10.1049/el:19720444
- Type: Article
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p.
612
–614
(3)
Previous analyses of the input impedance of a thin biconical antenna embedded in a conducting medium are extended to include the effect of the air-ground interface. It is supposed that the h.f. antenna could be located in a spherical insulating cavity. A brief description of the basic theory is given, together with illustrative calculations.
Method of calculating high-frequency parameters of m.o.s. transistors in the nonpinchoff region
- Author(s): P. Rossel
- Source: Electronics Letters, Volume 8, Issue 25, p. 614 –616
- DOI: 10.1049/el:19720445
- Type: Article
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p.
614
–616
(3)
A new method of calculating high-frequency admittance parameters of m.o.s. transistors is proposed. Approximate analytical expressions are obtained which are in good agreement, at very high frequencies, with the exact computed solutions. The domain of validity of the frequency and bias conditions of the yij relations is given.
Frequency-modulation noise in feedback oscillators
- Author(s): D.L.H. Blomfield
- Source: Electronics Letters, Volume 8, Issue 25, p. 616 –617
- DOI: 10.1049/el:19720446
- Type: Article
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p.
616
–617
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A system is described which measures the f.m. noise in a feedback oscillator. In this method, the oscillator's own frequency-determining network is made to function as the passive reference for a transmission-filter noise-measurement system with no degradation of sensitivity.
New technique for measuring acoustic-surface-wave propagation loss
- Author(s): A.J. Slobodnik and T.L. Szabo
- Source: Electronics Letters, Volume 8, Issue 25, p. 617 –618
- DOI: 10.1049/el:19720447
- Type: Article
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p.
617
–618
(2)
A new technique, capable of accurately measuring very low (∼ 0.1 dB/cm) acoustic-surface-wave propagation losses, has been developed and is described.
Scan-modulation system for improved spatial displays in scanning-electron-probe X ray microanalysis
- Author(s): E.W. Ward and R. Weeks
- Source: Electronics Letters, Volume 8, Issue 25, p. 619 –620
- DOI: 10.1049/el:19720448
- Type: Article
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p.
619
–620
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Improved display of areas of interest is achieved by modulating the line-scan speed so that areas of higher count rate are scanned more slowly. The sensitivity to differences in element concentration is enhanced, and location and identification of small particles and inclusions is greatly facilitated.
Peristaltic charge-coupled device: a new type of charge-transfer device
- Author(s): L.J.M. Esser
- Source: Electronics Letters, Volume 8, Issue 25, p. 620 –621
- DOI: 10.1049/el:19720449
- Type: Article
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p.
620
–621
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A new type of charge-transfer device (c.t.d.) is presented. The main difference from known c.t.d.s is that the bulk transport of majority carriers is used; this, together with a capacitive decoupling of the carriers from the electrode, yields a high transfer efficiency, possibly even up to the gigahertz range. Experiments agree with expectations.
Mirror corner for use with overmoded circular waveguide
- Author(s): A.L. Cullen and M. Byars
- Source: Electronics Letters, Volume 8, Issue 25, p. 621 –623
- DOI: 10.1049/el:19720450
- Type: Article
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p.
621
–623
(3)
A method for turning the axis of propagation of a highly overmoded circular-waveguide system through a right angle outlined. A modification which may result in lower spurious-mode generation and enable the size of the system to reduced considerably is proposed, and a practical configuration is suggested.
Real-time Fourier transform with a surface-wave convolver
- Author(s): O.W. Otto
- Source: Electronics Letters, Volume 8, Issue 25, p. 623 –624
- DOI: 10.1049/el:19720451
- Type: Article
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p.
623
–624
(2)
The generation of Fourier transforms of electronic signals in real time with an acoustic-surface-wave convolver is demonstrated. Two matched chirps propagating through each other behave as a narrowband filter in wavevector space, with the filter centre moving at a rate proportional to the acoustic velocity and the chirp rate.
Helical surface-acoustic-wave delay line
- Author(s): S.L. Quilici and H.J. Shaw
- Source: Electronics Letters, Volume 8, Issue 25, p. 625 –626
- DOI: 10.1049/el:19720452
- Type: Article
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p.
625
–626
(2)
A 2-port helical surface-acoustic-wave delay line operating at 50 MHz and having a 182 μs time delay on a thin Bi12GeO20 plate with face dimensions slightly under 5 × 2.5 cm is described, in which crosstalk suppression of more than 50 dB is achieved without introducing loss into the desired output signal.
Differential-incremental-sensitivity relationships
- Author(s): J.K. Fidler and C. Nightingale
- Source: Electronics Letters, Volume 8, Issue 25, p. 626 –627
- DOI: 10.1049/el:19720453
- Type: Article
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p.
626
–627
(2)
The exact relationships between differential and incremental sensitivity, which provide interesting results regarding the practical significance of differential sensitivity, zero sensitivity and the sensitivity of the network-function denominator, are investigated.
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