Study on Dielectric Resonator Antenna with Annular Patch for High Gain and Large Bandwidth

Abstract

A new high-gain cylindrical Dielectric res- onator antenna (DRA) with a large bandwidth is proposed. A cylindrical Dielectric resonator (DR), a double-annular patch and a metallic cylinder are used to obtain a large bandwidth and a high gain. The mode TM12 excited in the patch is used to enhance the gain of the DRA, and the cavity formed by the metallic cylinder provides a further higher gain and a larger bandwidth. The measured results demonstrate that the proposed DRA achieves a large band- width of 23% from 5.3 to 6.8GHz with VSWR less than two and a high gain around 11 dBi. In this paper, a new broadband, high-gain DRA design is proposed using a double-annular patch and a conducting cav- ity formed by a concentric metallic cylinder. Firstly, a single- annular patch is used to improve the gain of the DRA. After- ward, a double-annular patch is used to achieve a large gain bandwidth. Finally, a metallic cylinder is introduced to en- hance the resonating and obtain a higher gain. The antenna is manufactured and measured in the microwave anechoic cham- ber. The results of simulations and measurements are com- pared together, showing a good agreement. The results show that the antenna provides a further higher gain and a larger bandwidth using the proposed double-annular patch and a metallic cylinder.