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A circularly polarized short backfire antenna excited by an unbalance-fed cross aperture

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5 Author(s)
RongLin Li ; Georgia Electron. Design Center, Georgia Inst. of Technol., Atlanta, GA ; Thompson, D. ; Papapolymerou, J. ; Laskar, J.
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An unbalance-fed cross aperture is developed to excite a short backfire antenna (SBA) for circular polarization. The cross aperture consists of two orthogonal H-shaped slots with a pair of capacitive stubs and is fed by a single probe that forms an unbalanced feed with a shorting pin. It is demonstrated that the cross-aperture-excited SBA can achieve an axial ratio (les 3 dB) bandwidth of 4.2% with a voltage standing wave ratio (VSWR) bandwidth of 6.5% (VSWR<1.2) and a gain of 14 dBi. The antenna structure is described and the simulation and experimental results are presented. The mechanisms for impedance matching and circular-polarization production are analyzed

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Antennas and Propagation, IEEE Transactions on  (Volume:54 ,  Issue: 3 )