Conformal strip fed circularly polarized defected dielectric resonator antenna (CPDDRA) for 6G applications

Abstract

In this paper, a broadband circularly polarized (CP) dielectric resonator antenna (DRA) is proposed for terahertz (THz) applications. It consists of a silicon-based defected rectangular dielectric resonator (DR), excited by an asymmetric conformal strip feeding and a defective metallic ground plane. Multiple orthogonal modes are excited using a defective dielectric resonator antenna (DRA) and asymmetric conformal metallic strip to generate circular polarization. The proposed antenna has a fractional bandwidth of 89.5% (2.87–7.52 THz) and an axial ratio bandwidth of 79.2% (2.73–6.31 THz). The proposed antenna provides RHCP radiation pattern in the +z-direction and LHCP in the −z-direction. A peak gain of 6 dB is achieved at 6.9 THz with a compact antenna dimension of 50 × 40 μm2. An equivalent circuit with lumped elements is also presented for the proposed antenna in this paper. The simulated results of the proposed structure are in good agreement with those of equivalent circuit model. The proposed antenna structure fulfils all the requirements of a 6G antenna by operating over a wide terahertz frequency spectrum with circular polarization characteristics, an average peak gain, stable radiation patterns and compact dimensions.