Bird, TS 1985, 'Accurate Asymptotic Solution for the Surface Field Due to Apertures in a Conducting Cylinder', IEEE Transactions on Antennas and Propagation, vol. 33, no. 10, pp. 1108-1117.
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Asymptotic solutions for the surface field due to a magnetic point source on a cylinder can simplify the computational task in the analysis of mutual coupling-e.g. in conformal arrays. Although several asymptotic solutions are at present available, their accuracy is limited. The aim here is to obtain a new approximate solution with improved accuracy. An asymptotic solution of the exact modal solution for the field on a cylinder which contains terms up to (k0t)-2, where t is the distance from the source, is derived. Approximate terms up to (k0t) -3 are included from the solution for a source on a plane conductor and an earlier asymptotic solution. The new approximate solution consists of the exact solution for a plane conductor, modulated by a Fock function, plus a contribution associated with the cylinder which vanishes in the limit of infinite radius. Typically for cylinders of radius greater than one and half wavelengths it agrees to within O.5 dB in magnitude and 1 ° in phase of the modal solution. Results for dominant mode mutual and self-admittances of rectangular apertures on a cylinder obtained from this solution are presented. A formula is also given for calculating self-admittances from an asymptotic solution. There is excellent agreement between admittances computed from the asymptotic solution and the modal solution. One exception is the self-susceptance of an axial slot where the error is larger than expected, although the error is low enough to be acceptable in most practical cases. Copyright © 1985 by The Institute of Electrical and Electronics Engineers, Inc.
Braun, RM & Downing, B 1985, 'Injection-lock Bandwidth Extension By Control Modulation And Current Hump Slope Detection', Electronics Letters, vol. 21, no. 13, pp. 564-566.
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Ziolkowski, RW 1985, 'Exact solutions of the wave equation with complex source locations', Journal of Mathematical Physics, vol. 26, no. 4, pp. 861-863.
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New exact solutions of the homogeneous, free-space wave equation are obtained. They originate from complex source points moving at a constant rate parallel to the real axis of propagation and, therefore, they maintain a Gaussian profile as they propagate. Finite energy pulses can be constructed from these Gaussian pulses by superposition. © 1985 American Institute of Physics.
ZIOLKOWSKI, RW 1985, 'N-SERIES PROBLEMS AND THE COUPLING OF ELECTROMAGNETIC-WAVES TO APERTURES - A RIEMANN-HILBERT APPROACH', SIAM JOURNAL ON MATHEMATICAL ANALYSIS, vol. 16, no. 2, pp. 358-378.
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Bird, TS 1985, 'MUTUAL COUPLING IN WAVEGUIDE-FED PARALLEL PLATE LENSES.', IREECON International (Convention Digest) (Institution of Radio and Electronics Engineers Australi, pp. 936-939.
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An element-by-element analysis of mutual coupling in waveguide-fed parallel plate lenses is described which uses solutions for the surface field excited by a magnetic dipole on a concave cylindrical conductor. Coupling coefficients computed by this method are compared with measured results for a circular and a Rotman lens.
Bird, TS & Poulton, GT 1985, 'ENVELOPE-CONSTRAINED PATTERN SYNTHESIS FOR SATELLITE ANTENNAS.', IREECON International (Convention Digest) (Institution of Radio and Electronics Engineers Australi, pp. 567-570.
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Two techniques are compared for contoured beam design for on-board satellite antennas with constraints on both co-polar and cross-polar pattern envelopes. The techniques are based respectively on a penalty function approach and the method of successive projections and are applied to an array-fed single-offset reflector antenna producing a beam covering the south-east region of Australia.