Investigation of an asymmetrical E‐shaped dielectric resonator antenna with wideband characteristics

Abstract

A novel low profile dielectric resonator antenna (DRA) is presented in this study for broadband applications. An asymmetric E-shaped dielectric resonator is analysed and optimised numerically as a wideband radiator. The fundamental mode is excited along with three nearest higher modes inside the DRA. A detailed impedance transformation is discussed to merge these modes collectively resulting in a single wideband operation. A microstrip fed conformal strip is used to stimulate the DRA. The proposed DRA is fabricated and tested. For |S11| ≤ −10 dB, the DRA offers a frequency band of 6.0–10.2 GHz with an impedance bandwidth of 52%. The measured and calculated results are compared and found in good match. The DRA's radiation characteristics are measured at different frequencies. A stable radiation pattern is observed throughout the band of operation. The measured gain of the wideband antenna is ranging from 4.5 to 8.1 dBi.