SLOT-COUPLED MEANDERED MICROSTRIP ANTENNA FOR COMPACT DUAL-FREQUENCY OPERATION

By using a meandered rectangular patch and a slot-coupling feed, compa ct dual-frequency operation of microstrip antennas is achieved. In thi s design, the two operating frequencies are mainly controlled by the p atch dimensions and the inserting slit length; a large frequency ratio (> 2.5) of the two operating frequencies can also be obtained. For fi xed dual-frequency operation, an antenna size reduction as large as si milar to 50% has also been obtained using the present proposed design as compared to the case using a regular rectangular patch.