Online ISSN
1350-911X
Print ISSN
0013-5194
Electronics Letters
Volume 12, Issue 5, 4 March 1976
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Volume 12, Issue 5
4 March 1976
Digital filtering using cotransforms in finite fields
- Author(s): H. Nussbaumer
- Source: Electronics Letters, Volume 12, Issue 5, p. 113 –114
- DOI: 10.1049/el:19760088
- Type: Article
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p.
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–114
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Mersenne and Fermat transforms have been proposed as a way of computing convolutions for filtering applications. These transforms can be computed without multiplications and without roundoff errors. The letter points to the use of residue arithmetic as a way of relieving word-length limitations normally associated with these transforms.
Unassigned eigenvalues in Morgan's decoupling technique
- Author(s): H.M. Power and A. Tsingas
- Source: Electronics Letters, Volume 12, Issue 5, p. 114 –115
- DOI: 10.1049/el:19760089
- Type: Article
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It is shown that, in the m-input m-output nth-order linear system dx/dt=Ax+Bu, y=Cx, the n−m eigenvalues which are not assigned by the designer in applying Morgan's decoupling theory are those of thc matrix. It is assumed that rank C = m and that the state variables are oredered so that the leading m columns C1 are linerly independent.
Loss measurements in stress-induced optical waveguides fabricated by an embossing process
- Author(s): P.V.H. Sabine
- Source: Electronics Letters, Volume 12, Issue 5, p. 115 –116
- DOI: 10.1049/el:19760090
- Type: Article
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–116
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Stress-induced light guides have been fabricated by an embossing process. The results of detailed loss measurements show that these waveguides can exhibit low optical attenuation.
S.A.W. 350 μs binary phase-shift-keyed matched filter
- Author(s): K.V. Lever ; E. Patterson ; P.C. Stevens ; I.M. Wilson
- Source: Electronics Letters, Volume 12, Issue 5, p. 116 –117
- DOI: 10.1049/el:19760091
- Type: Article
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–117
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An asynchronous 350 μs s.a.w. matched filter for a 10.36 Mchip s−1 binary phase-shift-keyed waveform, with 34 dB signal/noise gain (s.n.g.), has been constructed by cascading seven 50 μs s.a.w. correlators. The effects of device imperfections and the repeated transduction process on the s.n.g. have been analysed. Predictions indicate that it is practicable to extend the technique to achieve millisecond matched filters.
Attenuation measurement of cylindrical dielectric-rod waveguide
- Author(s): Shuichi Shindo and Isa Ohtomo
- Source: Electronics Letters, Volume 12, Issue 5, p. 117 –118
- DOI: 10.1049/el:19760092
- Type: Article
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–118
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Measurements have been made of the attenuation coefficient of cylindrical dielectric-rod waveguide by a transmission method at 100 GHz. An 8 dB/m attenuation coefficient was obtained, caused half and half by the absorption due to losses in the dielectric and by the scattering due to irregularities and inhomogeneities in the dielectric.
A.S.W. filter bank using a multistrip reflective array
- Author(s): Michel Feldmann ; Jeannine Henaff ; Michel Carel
- Source: Electronics Letters, Volume 12, Issue 5, p. 118 –119
- DOI: 10.1049/el:19760093
- Type: Article
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–119
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A new frequency-sensitive a.s.w. structure is presented. The device, operating by reflection of acoustic surface waves, is used as a filter bank.
High values of rain-induced differential attenuation measured on a 53 km path at 13 GHz
- Author(s): J. Fimbel ; M. Juy ; L. Boithias
- Source: Electronics Letters, Volume 12, Issue 5, p. 119 –120
- DOI: 10.1049/el:19760094
- Type: Article
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–120
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An experiment was designed to determine the differential attenuation due to rain at 13 GHz on a 53 km path. Differential attenuations measured during the summer of 1975 are higher then those predicted by theory or reported by other experimenters.
Eigenmode analysis of anisotropic optical fibres or integrated optical waveguides
- Author(s): P. Vandenbulcke and P.E. Lagasse
- Source: Electronics Letters, Volume 12, Issue 5, p. 120 –122
- DOI: 10.1049/el:19760095
- Type: Article
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Using the finite-element technique, the eigenmodes propagating in an inhomogeneous, anisotropic optical waveguide with arbitrary cross-section are computed. The method is based on a variational principle for the modes of an anisotropic dielectric waveguide. It is shown that very accurate results are obtained, even for the guides formed by very small changes in the refractive index. As an example, the propagation characteristics of a channel guide embedded in LiNbO3 are computed.
Electrically-variable optical-beam deflection and focusing with p.l.z.t. ceramics
- Author(s): I. Kaufman and R.S. Strawn
- Source: Electronics Letters, Volume 12, Issue 5, p. 122 –123
- DOI: 10.1049/el:19760096
- Type: Article
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Discs of the ferroelectric ceramic p.l.z.t. have been used for electrically controlled light-beam deflection, with deflection angles up to 6°. and for mirrors of electrically variable focal length. The two techniques, both with nonvolatile memory, should find applications in optical instruments.
Null-steering antenna for mobile communication
- Author(s): D.E.N. Davies and M. Rizk
- Source: Electronics Letters, Volume 12, Issue 5, p. 123 –124
- DOI: 10.1049/el:19760097
- Type: Article
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The letter describes an antenna system for communication with mobiles. It provides omnidirectional coverage in the horizontal plane, plus a directional null which may be electronically steered in azimuth to minimise unwanted interference. The system uses a 5-element circular array with a simple feed network and a single phase shifter to control the null direction. Experimental results are quoted for a system capable of operating over a band of 120 to 190 MHz.
Coherent Gunn oscillations in Gaxin1−xSb
- Author(s): K. Segawa ; H. Miki ; M. Otsubo ; K. Shirahata ; K. Fujibayashi
- Source: Electronics Letters, Volume 12, Issue 5, p. 124 –125
- DOI: 10.1049/el:19760098
- Type: Article
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Gunn oscillations in GaxIn1−xSb were observed in the composition range 0.40 ≤ X ≤ 0.91. Negative resistance exists in the same composition range investigated. The threshold field for the current oscillation was in the range 430–790 V/cm.
Influence of charge-transfer inefficiency on c.c.d. recursive-filter performance
- Author(s): Y.T. Yeow and J. Mavor
- Source: Electronics Letters, Volume 12, Issue 5, p. 125 –127
- DOI: 10.1049/el:19760099
- Type: Article
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–127
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A simple delay-element model is given to account for the charge-transfer inefficiency of c.c.d.s. The experimental and calculated frequency responses of a recursive filter are given to illustrate the suitability of the model.
Reply to ‘Comment on Choice of grid configuration of array antennas’
- Author(s): B.N. Das and J.S. Rao
- Source: Electronics Letters, Volume 12, Issue 5, p. 127 –128
- DOI: 10.1049/el:19760100
- Type: Article
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Erratum: Design technique for microwave-transistor power amplifiers
- Author(s): K.L. Kotzebue
- Source: Electronics Letters, Volume 12, Issue 5, page: 128 –128
- DOI: 10.1049/el:19760101
- Type: Article
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