1 Institute for Communication Systems (ICS), Home of 5GIC and 6GIC, University of Surrey, Guildford, GU2 7XH, UK.
2 Institute for Communication Systems (ICS), Home of 5GIC and 6GIC, University of Surrey, Guildford, GU2 7XH, UK. m.khalily@surrey.ac.uk.
3 Wireless Technology Lab, Huawei Technologies Co., Ltd., No.2222, Xin Jinqiao Road, Shanghai, China.
4 Department of Electrical and Computer Engineering, Concordia University, Montreal, QC, H3G 2W1, Canada.

A novel high-isolation, monostatic, circularly polarized (CP) simultaneous transmit and receive (STAR) anisotropic dielectric resonator antenna (DRA) is presented. The Proposed antenna is composed of two identical but orthogonally positioned annular sectoral anisotropic dielectric resonators. Each circularly polarized (CP) resonator consists of alternating stacked dielectric layers of relative permittivities of 2 and 15 and is excited by a coaxial probe from the two opposite ends to have left and right-hand CP. Proper element spacing and a square absorber are placed between the resonators to maximize Tx/Rx isolation. Such a structure provides an in-band full-duplex (IBFD) CP-DRA system. Measurement results exhibit high Tx/Rx isolation better than 50 dB over the desired operating bandwidth (5.87-5.97 GHz) with a peak gain of 5.49 and 5.08 dBic for Ports 1 and 2, respectively.