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Symmetric-Aperture Antenna for Broadband Circular Polarization

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3 Author(s)
Nasimuddin ; Inst. for Infocomm Res., A*STAR, Singapore, Singapore ; Zhi Ning Chen ; Xianming Qing

A novel symmetric-aperture antenna is proposed for broadband circularly polarized (CP) radiation using a coplanar waveguide (CPW) feed. The proposed antenna consists of a CPW-feed and a wide symmetric aperture along the diagonal axis. A symmetric-aperture consists of two diamond-shaped sections. The symmetric-aperture and CPW-feeding structure are fabricated on the same plane of a dielectric substrate. Wideband CP radiation is achieved by changing the arms of symmetric-aperture and stripline length. The measured bandwidths of 3-dB axial ratio (AR) and 10-dB return loss are around 68% (2.4-4.85 GHz) and 107% (1.6-5.25 GHz), respectively. The measured boresight gain is more than 3.0 dBic over the CP bandwidth. Overall antenna size is around 0.7λo × 0.7λo × 0.019λo at 3.5 GHz.

Published in:

Antennas and Propagation, IEEE Transactions on  (Volume:59 ,  Issue: 10 )

Date of Publication:

Oct. 2011

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