Aesthetic wideband dielectric resonator antenna based on fractal slot with two independently controllable resonant frequencies

Abstract

An aesthetic wideband dielectric resonator antenna (DRA) based on the Minkowski fractal slot is firstly presented. The proposed DRA consists of a glass dielectric resonator (DR) with the laser engraving pattern, the ground with the Minkowski fractal slot, the fork-shaped microstrip line, and the substrate. By employing the Minkowski fractal slot, the TE₁₁₁ mode of the DR and an additional hybrid mode are excited to realize the wideband characteristics. A parametric study is performed to analyze the wideband DRA performance. The simulated results show the hybrid mode and TE₁₁₁ mode can be controlled independently. To achieve the aesthetics of the DRA, a school badge is engraved inside the glass DR. Finally, the proposed DRA is fabricated and measured. A wide impedance bandwidth of 38.4% and the peak gain of 6.5dB for S₁₁ < -10dB are achieved.