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Scattering characteristics of a 1D array of cavity-backed cylindrical holes in a PEC ground plane

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4 Author(s)
Villegas, F.J. ; California State Univ., Los Angeles, CA, USA ; Rahmat-Samil, Y. ; Manasson, V. ; Sadovnik, L.

We examined the scattering characteristics of a canonical rod/hole system. We found that the holes could simply be modeled as sections of cylindrical waveguides with short-circuit terminations. Comparisons with fundamental quantities such as the guided wavelength and cutoff frequency yielded results that agreed quite well. The notion of an effective single-hole efficiency was introduced, implicitly accounting for inter-element coupling. We found that it asymptotically tends to a constant value as the number of holes increases. We also concluded that the proximity of the rod to the grating plays an important role in the coupling phenomenon, a result of the traveling-wave nature of the rod field. Finally, we compared a computed array far-field pattern with one based on a simple array-factor expression that includes an HFSS (a commercial 3D finite-element EM simulator) computed leakage constant. The results lead to the conclusion that use of the effective efficiency as an array synthesis parameter will yield the predicted antenna characteristics.

Published in:

Antennas and Propagation Society International Symposium, 2000. IEEE  (Volume:4 )

Date of Conference:

16-21 July 2000