Hr. Hassani et D. Mirshekarsyahkal, ANALYSIS OF STACKED RECTANGULAR PATCH ANTENNAS WITH NONALIGNED PATCHES OR UNEQUAL PATCH SIZES, IEEE transactions on antennas and propagation, 42(9), 1994, pp. 1333-1336
Using the spectral domain technique, changes in the characteristics of
electromagnetically coupled stacked rectangular patch antennas due to
variations in the alignment of patches and patch sizes are investigat
ed. Some of the observations can be used in the design of these antenn
as in order to equalize the input impedances at the resonances, shift
the resonant frequencies, broaden the bandwidth, and estimate changes
in the radiation patterns. It is specifically shown that a displacemen
t in the top patch in the direction of resonance can broaden the beamw
idth in the E-plane at the upper resonance at the expense of some dist
ortion in the radiation pattern.