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2017-04-12
Novel Circularly Polarized SIW Cavity-Backed Antenna with Wide CP Beamwidth by Using Dual Orthogonal Slot Split Rings
By
Progress In Electromagnetics Research C, Vol. 73, 97-104, 2017
Abstract
A circularly polarized (CP) substrate integrated waveguide (SIW) cavity-backed antenna based on dual concentric, orthogonal slot split ring resonators is proposed and experimentally studied. The circularly polarized wave is generated by two split ring-slots etched in the upper metal layer of the SIW cavity resonator. These two slots are excited by a coaxial probe located in the gap of the external slot split ring to radiate the right-handed circularly polarized (RHCP) wave. By rotating the dual split slot ring resonators and the probe by 45 degreesrelative to the backed cavity, a better match characteristic and a slightly higher radiation gain are obtained. Because of theconcentricity of radiant split ring slots, the beamwidth of the circular polarization is obviously increased.From the experimental results, the impedance bandwidth was 10.8% for the reflection coefficient less than -10 dB, the axial ratio (AR) bandwidth was 1.54% for the AR less than 3 dB, and the RHCP gain was 4.44 dBi. Moreover, the 3-dB axial ratio beamwidth at the centre frequency of 10.40 GHz has been extended to 142° in the angular range from -78° to +64°.
Citation
Jian-Quan Huang, Dajun Lei, Chunzhi Jiang, Zhenhua Tang, Feng Qiu, Ming Yao, and Qing-Xin Chu, "Novel Circularly Polarized SIW Cavity-Backed Antenna with Wide CP Beamwidth by Using Dual Orthogonal Slot Split Rings," Progress In Electromagnetics Research C, Vol. 73, 97-104, 2017.
doi:10.2528/PIERC17021706
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