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A Novel Circular Quarter-Mode SIW Cavity-Backed Diversity Antenna with Dual-Circular Polarization | IEEE Conference Publication | IEEE Xplore

A Novel Circular Quarter-Mode SIW Cavity-Backed Diversity Antenna with Dual-Circular Polarization


Abstract:

This paper presents a dual-circularly polarized (CP) quarter-mode substrate integrated waveguide (QMSIW) antenna with 100% usable bandwidth. The design consists of a circ...Show More

Abstract:

This paper presents a dual-circularly polarized (CP) quarter-mode substrate integrated waveguide (QMSIW) antenna with 100% usable bandwidth. The design consists of a circular QMSIW excited using two orthogonal co-axial fed 50-Ω RF ports to achieve polarization diversity. A section of diagonal vias are introduced on either sides of the quasi-magnetic wall of the QMSIW antenna to enhance the isolation between the RF ports and segment the QMSIW into two cavities. In addition, two narrow rectangular slots are etched out from the center of the orthogonal radial lines of the QMSIW and shorting vias are introduced along the periphery of the waveguide between these slots. This combination of slots with vias generates circular polarization (CP) for the TE101 mode of the antenna. The antenna radiates with right hand circular polarization (RHCP) when excited at port 1 and left hand circular polarization (LHCP) is obtained by exciting port 2. A prototype of the dual CP-QMSIW is fabricated and tested. The measured isolation between the ports is greater than 25 dB with a 3-dB axial ratio bandwidth (AR-BW) of 3.23% centered at 10.215 GHz that completely overlaps with the impedance bandwidth. The antenna exhibits unidirectional radiation patterns with a gain of 6.44 dBi in the operating band. The diversity performance of the fabricated dual-CP prototype is verified by measuring the envelope correlation coefficient (ECC) and mean efficient gain (MEG).
Date of Conference: 16-19 July 2018
Date Added to IEEE Xplore: 30 May 2019
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Conference Location: Bangalore, India

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