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Application of modal analysis to a waveguide-cavity junction formed by an iris obstacle

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3 Author(s)
Kooi, P.S. ; National University of Singapore, Department of Electrical Engineering, Singapore, Singapore ; Leong, M.S. ; Thng, H.

This paper describes an application of the modal-analysis technique for studying the coupling of a circular waveguide to a cylindrical cavity via an infinitely thin iris obstacle containing a central circular aperture. It confirms that, for this type of coupling problem, for optimal convergence the equality of the ratios m : q : n and RA : ra : RB needs to be taken, where m, q and n are, respectively, the number of waveguide modes, aperture functions and cavity modes, and RA, ra and RB are the corresponding radial dimensions. The results obtained are compared with those derived from a transmission-line model and experiment.

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Microwaves, Optics and Antennas, IEE Proceedings H  (Volume:131 ,  Issue: 1 )