A Novel Low Axis Ratio Double-Circularly Polarized Microstrip Antenna

Abstract

This article presents a dual circular polarization (CP) microstrip antenna, emitting electromagnetic waves above and below the substrate, which is fed by the double L-probe. Selecting the L-probe feed increases the bandwidth of the antenna, and different probes control the rotation of CP. The antenna could radiate two polarized waves of the same amplitude and vertical through two square radiation patches; meanwhile, adjusting the phase difference between both waves to 90° will produce a CP wave in the far-field. The simulation and measurement results show that the antenna is in 4.3–4.8 GHz band with S11<−10 dB, S22<−10 dB, and AR<3 dB. Furthermore, a lower axis ratio could be obtained in this work compared with similar antennas of the same type.

Implanted Rhombus Ring Partial Inset-Fed Circularly Polarized Microstrip Monopole Antenna for WBAN Applications

“…In [18], a 3-D printed circularly polarized (CP) open-ended waveguide antenna array based on an in-built antipodal exponential groove polarizer was investigated. In [19], a new dual circular polarized (CP) microstrip antenna fed by a dual L-shaped probe and emitting electromagnetic waves above and below the substrate was reported. A modified electric-inductive-capacitive resonator (m-ELC) and an arrow-shaped stub are introduced into the patch and ground plane of a quad-band multipolarized antenna with a truncated corner [20].…”