A dipole antenna system for simultaneous transmit and receive

A design of a 3-element simultaneous transmit and receive (STAR) antenna system is presented. The transmitter is an array of two equal-phase collinear half wavelength dipoles positioned such to create 180° near-field phase difference at the receiver´s location. With proper amplitude excitation, this configuration achieves isolation better than 70dB at the antenna resonant frequency and >45dB within a 13% bandwidth. The proposed antenna system maintains similar E- and H-plane patterns for both, the transmitter, and the receiver. The proposed configuration can be tuned (phase and amplitude) for better isolation at any frequency within the bandwidth while maintaining consistent and similar radiation patterns.