DUAL-FREQUENCY SLOTTED RECTANGULAR MICROSTRIP ANTENNA

By embedding a pair of properly-bent narrow slots close to the non-rad iating edges of a rectangular microstrip patch, a novel dual-frequency operation of microstrip antennas using a single probe feed is propose d and experimentally studied. The two operating frequencies have paral lel polarisation planes and similar broadside radiation patterns, and the frequency ratio of the two frequencies is controlled by the bent a ngle of the embedded slots. Details of the obtained dual-frequency per formance are presented and discussed.