Abstract
In this paper, a wideband dual-circularly polarized simultaneous transmit and receive (STAR) antenna is designed at ISM band. Four sequential rotated microstrip patch elements are excited by two sets of feeding networks: the feeding network of transmit (TX) antenna on the top side of the substrate for left hand circular polarization (LHCP), and the feeding network of receive (RX) antenna on the bottom side for right hand circular polarization (RHCP), or vice versa. The parasitic patches with an air gap are used to enlarge the gain bandwidth. The cancellation technique based on the phase cancellation and geometrical symmetry of antenna is employed. The simulation and measurement results show good agreement and demonstrate the good TX/RX isolation of greater than 35 dB across a wide bandwidth of 5–6 GHz. The TX/RX isolation reaches 48.5 dB @ 5.18 GHz, and the axial radio is better than 3 dB across the entire ISM band, which further proves the feasibility of this design methodology and the application in STAR and sensory integration.
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