Online ISSN
1350-911X
Print ISSN
0013-5194
Electronics Letters
Volume 12, Issue 9, 29 April 1976
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Volume 12, Issue 9
29 April 1976
Tunable magnetostatic surface-wave oscillator
- Author(s): N.D.J. Miller and D. Brown
- Source: Electronics Letters, Volume 12, Issue 9, p. 209 –210
- DOI: 10.1049/el:19760162
- Type: Article
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–210
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An S-band oscillator which is electronically tunable over the range 2.8–3.3 GHz is described. The oscillator makes use of a magnetostatic surface-wave delay line in the feedback loop of a solid-state amplifier.
Radiation of conical horns excited in higher-order modes
- Author(s): D. Fasold
- Source: Electronics Letters, Volume 12, Issue 9, p. 210 –211
- DOI: 10.1049/el:19760163
- Type: Article
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–211
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Theoretical investigations carried out for the far-field-radiation-pattern prediction of conical horns excited in the spherical TMmn and TEmn modes are applied on the radiation-pattern analysis of TM01 and TE01 modes. The results, valid even for conical horns with large flare angles, provide an optimum horn design for a maximum gain slope near the boresight axis.
Minimising signal distortion in f.l.f. active filters
- Author(s): R. Schaumann ; W.A. Kinghorn ; K.R. Laker
- Source: Electronics Letters, Volume 12, Issue 9, p. 211 –213
- DOI: 10.1049/el:19760164
- Type: Article
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–213
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A simple method is described which minimises signal distortion in follow-the-leader-feedback (f.l.f.) active filters. The procedure, which is easily implemented on a digital computer, determines the free design parameters of f.l.f. structures such that the signal-level capabilities of the filters are maximised.
Rotator and reflector for transfer functions
- Author(s): G.A. Nenov and Hr. Z. Shojlev
- Source: Electronics Letters, Volume 12, Issue 9, p. 213 –214
- DOI: 10.1049/el:19760165
- Type: Article
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–214
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A practical solution of the problem of the transformation of a nonlinear 2-port voltage transfer function T=Uy/Ux is presented. The proposed structure consists of summers and its features are analogous to the features of the Chua's rotator or reflector for driving-point functions.
Scattering loss of s.a.w. resonators
- Author(s): H.A. Haus
- Source: Electronics Letters, Volume 12, Issue 9, p. 214 –215
- DOI: 10.1049/el:19760166
- Type: Article
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A theory is outlined that predicts the scattering loss into bulk waves of high-Q-factor s.a.w. resonators. The theory applies to an isotropic medium. Nevertheless, experimental results on LiNbO3 are interpreted by the theory.
Fabrication of planar Gunn-effect logic device with self-aligned Schottky-barrier gates
- Author(s): O. Wada ; S. Yanagisawa ; H. Takanashi
- Source: Electronics Letters, Volume 12, Issue 9, p. 215 –217
- DOI: 10.1049/el:19760167
- Type: Article
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–217
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A method of fabricating planar Gunn-effect devices with Schottky-barrier gates has been improved by using the self-alignment technique. Dual-gate devices fabricated by this method have fine geometries and exhibited sufficiently good performance.
70 MHz surface-acoustic-wave resonator notch filter
- Author(s): D.P. Akitt
- Source: Electronics Letters, Volume 12, Issue 9, p. 217 –218
- DOI: 10.1049/el:19760168
- Type: Article
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–218
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A 70 MHz notch filter employing a surface-acoustic-wave resonator in a hybrid-coil circuit to produce a notch depth of 50 dB has been developed. The notch frequency is tunable over a 40 kHz range and the passband attenuation is approximately 7 dB.
Crosspolarisation characteristics of axially symmetric reflectors
- Author(s): B. Maca. Thomas
- Source: Electronics Letters, Volume 12, Issue 9, p. 218 –219
- DOI: 10.1049/el:19760169
- Type: Article
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–219
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The crosspolarisation levels of symmetric front-fed paraboloids and dual-reflector antenna systems have been determined for a wide range of reflector and feed parameters. It is shown that minimum crosspolarisation is achieved when the feed radiates a polarisation-pure field, and, in this case, the front-fed paraboloid is superior.
New method of optimising nonadaptive predictive systems
- Author(s): J. Isailović
- Source: Electronics Letters, Volume 12, Issue 9, p. 220 –221
- DOI: 10.1049/el:19760170
- Type: Article
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–221
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A new method of predictive-system optimisation, taking into account the distribution of probabilities of occurrences of the input signal statistical parameters, is proposed. The method is applied to the 1st-order predictor for the video signal. Several approximations of the distribution function (weight function) have been considered.
Measurement of the base diffusion profile of a narrow-basewidth transistor
- Author(s): R.C. Booth
- Source: Electronics Letters, Volume 12, Issue 9, p. 221 –222
- DOI: 10.1049/el:19760171
- Type: Article
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A technique for routinely determining the intrinsic base diffusion profile in a narrow-basewidth transistor is described. The technique involves the fabrication of a novel Van der Pauw device and the subsequent measurement of the sheet resistance and Hall coefficient of the base region. Diffusion profiles measured in a shallow double-diffused arsenic-emitter boron-base transistor structure by this technique are reported.
Approximate calculation of radiation from open-ended wide microstrip lines
- Author(s): G. Kompa
- Source: Electronics Letters, Volume 12, Issue 9, p. 222 –224
- DOI: 10.1049/el:19760172
- Type: Article
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Theoret ca results as given in the literature for the open-ended dielectrically loaded parallel-plate waveguide are used to calculate the input reflection coefficient of open-circuited wide microstrip lines. Numerical computations are in good agreement with measurements for a stripwidth/substrate-height ratio of greater than 3.
Semi-ideal sine oscillators (s.i.s.o.)
- Author(s): F. Doorenbosch
- Source: Electronics Letters, Volume 12, Issue 9, p. 224 –226
- DOI: 10.1049/el:19760173
- Type: Article
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A class of semi-ideal sine oscillators (s.i.s.o.) featuring independent control of frequency and damping and lack of spurious responses is described.
Low-sensitivity bandpass filters using the operational-amplifier pole
- Author(s): A.K. Mitra and V.K. Aatre
- Source: Electronics Letters, Volume 12, Issue 9, p. 226 –227
- DOI: 10.1049/el:19760174
- Type: Article
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–227
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The single-pole rolloff of the operational amplifier is used to realise 2nd-order bandpass filters with one external capacitor. These filters have low sensitivity to all the circuit parameters and are suitable for high-frequency medium-Qfactor operation.
Error probabilites for a.s.k./p.s.k. systems in an additive mixture of Gaussian and impulsive noise
- Author(s): N.B. Chakrabarti and R. Gangopadhyay
- Source: Electronics Letters, Volume 12, Issue 9, p. 227 –229
- DOI: 10.1049/el:19760175
- Type: Article
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–229
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A simple expression for the error probability for coherent a.s.k/p.s.k systems in an additive mixture of Gaussian and impulsive noise is obtained. It is shown that the impulsive noise considered may, in certain situations, be treated as conditionally Gaussian. This allows the above error probability to be expressed a weighted sum of the error probabilities due to Gaussian noises of different noise powers.
Calculation of radiation patterns of paraboloidal reflectors by high-frequency asymptotic techniques
- Author(s): M. Safak
- Source: Electronics Letters, Volume 12, Issue 9, p. 229 –231
- DOI: 10.1049/el:19760176
- Type: Article
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229
–231
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Radiation pattern of a paraboloid is calculated by asymptotic physical optics and geometrical theory of diffraction and the two are compared.
Reduction of losses in low-frequency (2 MHz) surface-wave delay line by outgassing
- Author(s): B.R. Tittmann
- Source: Electronics Letters, Volume 12, Issue 9, p. 231 –232
- DOI: 10.1049/el:19760177
- Type: Article
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p.
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–232
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Output signal enhancements by as much as 8 dB were achieved for 2.25 MHz surface-wave delay line (55 μs delay) made of high-density p.z.t. by outgassing treatments in vacuum.
Requirement on carrier concentration and geometry of Schottky-electrode-triggered Gunn device
- Author(s): Nobuo Hashizume and Kazutaka Tomizawa
- Source: Electronics Letters, Volume 12, Issue 9, p. 232 –234
- DOI: 10.1049/el:19760178
- Type: Article
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From the consideration of a stable domain I/V characteristic and of a practical Schottky electrode bias, it has been made clear that there are requirements for carrier concentration and geometry available for a Schottky-electrode-triggered Gunn device. Numerical examples are given for various carrier concentrations and geometries.
Low-frequency stability margin in IMPATT-diode circuits
- Author(s): M.G. Reggiani
- Source: Electronics Letters, Volume 12, Issue 9, p. 234 –235
- DOI: 10.1049/el:19760179
- Type: Article
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–235
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A new diagram is proposed, useful in evaluating at first sight the low-frequency stability performance of IMPATT-diode circuits. A definition for the low-frequency stability margin is given. The use of the diagram in computing the stability margin is shown. The usefulness of the diagram and of the definition is pointed out.
Addendum: Rain-induced deflection of microwave and millimetre-wave radiowaves
- Author(s): J. Troughton and B.G. Evans
- Source: Electronics Letters, Volume 12, Issue 9, page: 235 –235
- DOI: 10.1049/el:19760180
- Type: Article
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Comment on ‘1/f noise generated by high-frequency currents’
- Author(s): D.A. Bell ; E.J.P. May ; H.G. Morgan ; W.D. Sellars
- Source: Electronics Letters, Volume 12, Issue 9, page: 235 –235
- DOI: 10.1049/el:19760181
- Type: Article
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