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A rectangular beam waveguide resonator and antenna

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1 Author(s)
J. Brauer ; A. O. Smith Corporation, Milwaukee, Wis., USA

A closed microwave resonator is derived from the beam waveguide of rectangular symmetry. The resonator is essentially a metal box with one curved wall and approximate dimensions \lambda /2 by \lambda /3 by 20\lambda , where \lambda is the free-space wavelength. Each beam waveguide mode is shown to resonate at a distinct frequency. When apertures are cut in one wall of the resonator a line source antenna is formed. Since the n = 0 and n = 1 beam modes have field distributions which are, respectively, a Gaussian and the derivative of a Gaussian, the radiation patterns produced are of interest in monopulse radar and tracking. A 9 GHz resonator antenna was built, and its measured radiation patterns confirm the theory.

Published in:

IEEE Transactions on Antennas and Propagation  (Volume:20 ,  Issue: 5 )