volume | PIER Journals

Abstract

A wideband circularly polarized (CP) dielectric resonator antenna (DRA) with integrated harmonic suppression is proposed. The design transforms the original rectangular coupled slot into a branched configuration to perturb the electric field distribution within the dielectric resonator (DR) and ground plane, thereby obtaining wideband circular polarization characteristic. For harmonic suppression, a double-ended feeding structure integrated with a π-shaped stub and a transverse stub is introduced, generating four radiation nulls. Furthermore, a stepped-impedance feeding line is employed to extend the upper stopband bandwidth. A prototype is fabricated and measured; the experimental results and simulations are generally consistent. The antenna achieves a -10 dB impedance bandwidth of 40.2% (2.86-4.3 GHz), a 3 dB axial ratio bandwidth of 26.13% (3.06-3.98 GHz), an average gain of 5.3 dBi, and harmonic suppression of 2.7f₀ (where f₀ is the center frequency). The out-of-band suppression in both upper and lower stopbands exceeds 15 dB.

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Dr. Chuanyun Wang

Mr. Yi Ouyang

Dr. Pin Wen

Dr. Zhiyong Tan

Dr. Tianle Zheng