Results based on spectral-domain full-wave analysis are presented for
several microstrip antennas with multidielectric layers. The geometrie
s include (a) rectangular patch with two superstrates, (b) rectangular
patch with a superstrate and an unwanted air space, and (c) rectangul
ar patch with a superstrate and two substrates. Comparison with measur
ement is given. (C) 1995 John Wiley & Sons, Inc.