An Approach to Generate Circular Polarization in a Modified Cylindrical-Shaped Dielectric Resonator Antenna Using PMC Boundary Approximation

Abstract

A new kind of technique to generate broadside circular polarization (CP) in a dielectric resonator antenna has been presented in this letter. In the proposed CP design, the geometrical shape of a simple cylindrical dielectric resonator has been deformed periodically with same angular factor (“β” = 45°) along the azimuthal direction. Assuming magnetic boundary conditions at the air-dielectric interface, the tangential electric fields are decomposed orthogonally in such a way that circularly polarized wave could be generated. To validate the antenna performance, an antenna prototype has been fabricated and experimentally verified where 51.2% (3.37-5.69 GHz) of input impedance bandwidth (|S <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">11</sub> | <; -10 dB) and 8.01% (4.2-4.55 GHz) of axial ratio bandwidth (AR ≤ 3 dB) have been obtained.