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

By Z. Deng, F. Zhang, M. Liang, Y.-L. Yao, and F. Zhang

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Abstract:
A simple dual-port sum-difference beam antenna with high isolation is proposed. A T-shaped 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% (4.82-5.33 GHz) for the sum port and 2.0% (4.95-5.05 GHz) for the difference port, respectively. In addition, high port-isolation better than 50dB is achieved covering a wide band from 4.0 GHz to 5.5 GHz. 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.

Citation:
Z. Deng, F. Zhang, M. Liang, Y.-L. Yao, and F. Zhang, "A Dual-Port Sum-Difference Beam Antenna with Simple Structure and Very High Isolation," Progress In Electromagnetics Research C, Vol. 74, 41-49, 2017.
doi:10.2528/PIERC17031303

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