Design and Performance Analysis of Compact Rectangular Dielectric Resonator Antenna for Ultra-wideband Applications

Dielectric resonators offer a promising choice for achieving impedance matching at elevated frequencies. The paper presents a basic rectangular DRA-based microstrip patchless antenna for UWB. The design employs an Arlon AD 250 substrate with dimensions of 25 mm × 25 mm × 5.632 mm. The antenna structure presented uses DR material made of alumina (Al2 O3) with a relative permittivity of 9.8 and a loss tangent of 0.002. The design has a single-step microstrip feed with a rectangular dielectric resonator placed on top. The design incorporates a defective ground structure (DGS) located at the rear of the antenna. The design process progression has been elucidated using stages and their corresponding S-parameters. The recommended antenna design was evaluated using S-parameters, VSWR, radiation pattern, and surface current density. The gain of the suggested antenna is 5.03 dBi. The recommended antenna has 110.7% impedance bandwidth. This article also compares the anticipated study to the previous articles. The compact size and simplicity of the feed, ground, and dielectric resonator structure make it an attractive choice for integration into modern communication devices with stringent space constraints.