Broadband Dual-Polarized Fabry-Perot Antenna With Simple Feed for Full-Duplex Applications

In this letter, we present a simple-feed dual-polarized Fabry-Perot antenna with broadband and high-isolation for inband full-duplex applications. Its feeding element consists of a two-port patch antenna with one aperture coupled port and one microstrip-line-fed port for a high isolation without adding any out-of-phase power divider. For broadband and high-gain radiation, the two-port patch is incorporated with a stackedpatch and partially reflecting surface while maintaining the structure symmetry. The final design with an overall size of similar to 1.9 lambda(min) x1.9 lambda(min) x0.48 lambda(min) (lambda(min) is the free-space wavelength at the lowest operational frequency) has been fabricated and tested. The measurements result in a 10 dB return loss bandwidth of 19.1% (4.84-5.86 GHz), an isolation of >= 43 dB, a realized broadside gain of 12.4-14.2 dBi, cross-polarization level of <=-30 dB, and side-lobe level of <=-18 dB across 5.00-5.95 GHz.