A Broadband Dielectric Resonator ESPAR with H-shaped Slot Aperture and Perforated Structure

This paper proposes a broadband Electronically Steerable Passive Array Radiators (ESPAR) antenna based on the rectangular dielectric resonator, which is excited in a higher-order mode, TE
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mode. The proposed ESPAR is fed by a microstrip slot aperture. By using H-shaped slot coupling and perforation structure, enhancement of the impedance bandwidth is achieved. Numerical results show that the proposed ESPAR antenna has a relative bandwidth of approximately 24%(9.4 GHz – 12 GHz), and can perform a continuous beam scanning from -21° to 21°at 10 GHz while maintaining impedance matching within the scanning angle range.