Compact Asymmetrical T-Shaped Dielectric Resonator Antenna for Broadband Applications

A compact dielectric resonator antenna (DRA) for broadband applications is proposed. By applying an optimized asymmetrical T-shaped dielectric resonator (DR) and an inverted-trapezoidal patch as a feeding mechanism, an impedance bandwidth of about 75.1%, covering the frequency range from 3.81 to 8.39 GHz, is obtained. The volume of the proposed DRA without ground plane is 0.555 λ_d³ (λ_d is the dielectric wavelength at the central operating frequency). Taking a comprehensive consideration of the bandwidth and the size, the proposed DRA can provide maximum bandwidth per unit volume in related conformal patch excited wideband DRA designs. Design details of the proposed antenna and the results of both simulation and experiment are presented and discussed.