Radiation performances of a modified rhombic dielectric plate antenna

An antenna consisting of the modified rhombic dielectric plate with double tapers in the -plane excited by the open end of a transverse electric ( ) rectangular waveguide is proposed, and some antenna geometrical factors and radiation properties are given experimentally. It is found that these types of antennas have relatively narrow beamwidth and suppressed sidelobe in the -plane, fairly flat main lobe in the -plane, and medium performances of about 11.5 dB gain and 1.25 voltage standing-wave ratio (VSWR). It is also found that the radiation performances are virtually independent of frequency over a ten percent bandwidth about 10 GHz.