Abstract

A 2.45-GHz circularly-polarized planar inverted F antenna (PIFA) array antenna is designed for simultaneous transmit and receive (STAR) applications. The STAR array has eight elements and is configured such that four elements are used for transmitting (TX) and the other four for receiving (RX). The TX/RX beamforming networks (BFNs) consist of a 90° hybrid followed by two 180° hybrids. The RX BFN is utilized to reroute coupled TX to RX signals into the unused ports of the BFN to achieve high isolation. The array is simulated in HFSS, and then S-parameters are exported to AWR circuit simulator to incorporate the BFN and calculate system isolation. Measured results show that the fabricated antenna has >32 dB isolation with good efficiency and high quality patterns.

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