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A simple dual-port sum-difference beam antenna with high isolation is proposed. A Tshaped slot is utilized to achieve both sum-difference beam pattern and high port-isolation. The slot coupling feeding structure simplifies the feeding network and avoids complicated fabrication. The proposed antenna is simulated, fabricated and measured. Experimental validations confirm that the antenna has 10-dB impedance bandwidths of 10.2% (4.82–5.33GHz) for the sum port and 2.0% (4.95– 5.05GHz) for the difference port, respectively. In addition, high port-isolation better than 50 dB is achieved covering a wide band from 4.0GHz to 5.5GHz. The proposed antenna exhibits a measured peak gain of 6.3 dBi for the sum beam and a null depth better than −26 dB for the difference beam. Measured results agree well with simulated ones.

A DUAL-PORT SUM-DIFFERENCE BEAM ANTENNA WITH SIMPLE STRUCTURE AND VERY HIGH ISOLATION