A Dual-band Microstrip-fed Cavity-backed Subarray

A compact dual- and wide-band cavity-backed slot antenna subarray has been presented in this paper. Ridged slots have been employed in the design to shorten the slot length. Four slots are fed by two feeding networks printed on the upper layer of a substrate for great design flexibility. The designed antenna has been measured and experimental results have shown that the 10 dB return loss bandwidth is 7.5% for 900 MHz band and 26% for 1800 MHz band, respectively. Because of its compact size and good radiation patterns at both frequency bands, this described subarray can be very useful for dual-band array applications