A dielectric‐loaded broadband single‐ and dual‐polarized slot antenna with low profile and low cross‐polarization

Abstract

AbstractA dielectric‐loaded slot antenna with the characteristic of broadband, low profile, and low cross‐polarization is presented. The antenna incorporating a low permittivity () and multiple high permittivity () rectangle dielectric is fed by two rectangle slot, which generates three slot modes and achieves measured 10 dB impedance bandwidth of 88 from 1.57 to 4.04 GHz covering the long term evolution (1.71–2.69 GHz) and sub‐6G (3.3–3.6 GHz). Furthermore, the presented slot antenna with a footprint of 0.81 × 0.56 and a low profile of 0.09 ( is the wavelength in the air region at the center frequency) appears the performance of measured peak gain of 9 dB without using any dielectric resonator mode. On the basis of the single‐polarized design, the dual‐polarized design with a profile of 0.09 is investigated and fabricated. According to the measured results, the dual‐polarized prototype achieves a 10‐dB impedance of 60 from 1.6 to 3 GHz.