Bandwidth Enhancement of Circularly Polarized Dielectric Resonator Antenna

Abstract

Axial‐ratio (AR) bandwidth enhancement is achieved for a circularly polarized (CP) cylindrical dielectric resonator antenna (DRA) using a wideband hybrid coupler (WHC) combined with dual probe feed. The presented WHC, comprised of a Wilkinson power divider and a wideband 90° shifter, delivers good characteristics in terms of 3 dB power splitting and consistent 90° (±5°) phase shifting over a wide bandwidth. In turn, the proposed CP DRA, for the employment of the WHC, in place of conventional designs, provides a significant enhancement on AR bandwidth and impedance matching. The antenna prototype with the WHC exhibits a 3 dB AR bandwidth of 48.66%, an impedance bandwidth of 52.5% for voltage standing wave ratio (VSWR) ≤ 2, and a bandwidth of 44.66% for a gain of no less than 3 dBi. Experiments demonstrate that the proposed WHC is suitable for broadband CP DRA design.

A chronological review of circularly polarized dielectric resonator antenna: Design and developments

“…This section highlights the state‐of‐the‐art developments of CPDRA using single point feed 11‐64 and multi‐point feed power divider, 65‐76 along with modification of three dimensional DR shapes 77‐103 . In this review article, the authors have segregated CP mechanism in terms of excitation of feeding techniques like microstrip line, coaxial probe, and aperture coupled feed, which will be helpful to the researcher to get the complete idea about the developments of particular excitation feeding method …”

Circularly polarized two‐layer conical DRA based on metamaterial

“…Recently, the wide bandwidth has been used in many applications such as radar, telemetry, navigation, biomedical systems, mobile satellite, direct broadcast systems, global positioning systems, and remote sensing. The design of a suitable antenna for these systems is one of the most important current challenges . These latter require a circular polarization (CP).…”

“…The design of a suitable antenna for these systems is one of the most important current challenges. 10 These latter require a circular polarization (CP). The wide bandwidth antennas with a CP have been widely used because of their advantages such as the overcoming of the effects of rotation polarization caused by the atmosphere in the satellites and getting more information from the target into the radar system.…”

Circular feeding network for circular polarisation reconfigurable antennas

“…The idea is indeed based on the sequentially rotated serial feed for a single antenna [8,9]. It is not limited to the referred antennas and can be extended to dielectric resonator antennas, polyhedron helical antennas, spiral antennas and so on [10][11][12][13].…”