Influence of element shape on performance of patch array as frequency selective surface

The authors compare the reflection performance of a circular patch array with that of a cross dipole array. It is shown that the circular patch array provides a wider reflection band with a relatively slowly varing curves. This can be also deduced from the fact that the reflection band width increases with the width of cross dipole. So cross dipole array is preferred in use as the subreflector of a Cassegrain antenna. Experimental transmission coefficients are compared with the calculated results of modal analysis