ENHANCED RADIATION PATTERNS OF A WIDE-BAND STRIP-FED DIELECTRIC RESONATOR ANTENNA

A simple wide-band rectangular dielectric resonator antenna (dra) is designed for the x-band and ku-band applications. the dra is excited by a vertical strip placed on the middle of the dra’s wide side wall through a coaxial probe attached to a finite size ground plane. good agreement between measured and simulated results is obtained. the measured 10 db return loss bandwidth of the antenna is about 7.8 ghz (62%). the simulated gain of the antenna is 6.1 dbi at 12 ghz. the antenna excites undesired modes that perturb the radiation patterns and increase the cross-polarization level. the dielectric resonator is wrapped by a conducting strip to suppress some modes and improve the radiation characteristics of the antenna. adding the strip reduces the cross-polarization level and improves the co-polarization radiation pattern.