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Theory of frequency scanning of antennas

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2 Author(s)
Ishimaru, A. ; University of Washington, Seattle, WA, USA ; Tuan, H.-S.

This paper presents the theory of180degscanning for a linear array and Tchebycheff array by frequency variation and discusses the relationships between the linear array theory and theomega-betadiagram of periodic structures. Each element is excited by a slow-wave structure which is either nondispersive or dispersive. At a center frequency, the spacing is an integral multiple of guide wavelengthMlambda_{c}. It is shown that this is in fact the -Mth space harmonic in the so-called forbidden region, and all the other harmonics are slow. For a given frequency range, the necessary phase velocity and other parameters are determined in order to obtain180degscanning without causing other main beams, and the example is carried out for theX-band frequency range.

Published in:

Antennas and Propagation, IRE Transactions on  (Volume:10 ,  Issue: 2 )