Ws. Chen et al., SUPERSTRATE LOADING EFFECTS ON THE CIRCULAR-POLARIZATION AND CROSS-POLARIZATION CHARACTERISTICS OF A RECTANGULAR MICROSTRIP PATCH ANTENNA, IEEE transactions on antennas and propagation, 42(2), 1994, pp. 260-264
In this communication, we Brst present the superstrate loading effect
on a circularly polarized rectangular microstrip antenna. The design p
arameters of the superstrate-loading microstrip antenna for achieving
circular polarization at the main-beam direction are discussed. The ci
rcular polarization property in the entire main-beam region is also an
alyzed. Next, the crosspolarization characteristics of a rectangular p
atch antenna due to the superstrate loading are studied. A great depen
dence of the copolarized and crosspolarized radiations on the superstr
ate permittivity and thickness is observed.