Bird, TS 1979, 'MODE COUPLING IN A PLANAR CIRCULAR WAVEGUIDE ARRAY.', IEE journal on microwaves, optics and acoustics, vol. 3, no. 5, pp. 172-180.
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By means of an integral-equation approach, expressions are derived for all mode coupling occurring in a finite, planar circuit waveguide array. Modes coupling in the aperture of each waveguide yield terms dependent upon contour integrals. These are placed in a suitable form for numerical integration. A new asymptotic formula is obtained for the coupling between modes in separate waveguides. Theoretical results are presented for the TE//1//1 mode admittance of flanged circular waveguide and for two wavegides coupling in the H-plane. These results are shown to correlate satisfactorily with previously published experimental data.
Bird, TS 1979, 'OPTIMUM ARRAY FEED FOR A MULTIPLE-BEAM REFLECTOR ANTENNA.', IREECON International (Convention Digest) (Institution of Radio and Electronics Engineers Australia), pp. 44-46.
A method is described whereby the excitation of an array feed for a reflector antenna is synthesized so as to achieve high aperture efficiencies and low cross-polarization throughout a desired coverage region. Results are presented for a dual-offset reflector antenna having a circular waveguide array feed. 5 refs.