Circularly Polarized Cavity Backed Two-Element Rectangular Loop Slot Antenna

Song SHI  Kazuhiro HIRASAWA  Zhi Ning CHEN  

IEICE TRANSACTIONS on Electronics   Vol.E82-C   No.7   pp.1217-1222
Publication Date: 1999/07/25
Online ISSN: 
Print ISSN: 0916-8516
Type of Manuscript: Special Section PAPER (Special Issue on Microwave and Millimeter Wave Technology)
Category: Phased Arrays and Antennas
rectangular loop slot antenna,  circular polarization,  rectangular cavity,  short-circuiting point,  

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A cavity-backed two-element rectangular loop slot antenna for circular polarization is presented and investigated by using the generalized network formulation based on the equivalence principle. By applying the method of moments, the magnetic current including the effect of the cavity is obtained for a thin rectangular loop slot. Two short-circuiting points are introduced on the slots to get circular polarization and symmetrical radiation pattern. The axial ratio bandwidth (3 dB) with VSWR (2) reaches 7.6%. The measured and computed results are in good agreement.