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A novel wide-band circularly polarized patch antenna based on L-probe and aperture-coupling techniques

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2 Author(s)
Lau, K.L. ; Dept. of Electron. Eng., City Univ. of Hong Kong, China ; Luk, K.M.

The design and measurements of a wide-band patch antenna with circular polarization are presented. For the proposed antenna, an L-probe and an aperture are utilized to feed the patch orthogonally. The distance between the patch and the ground plane is 0.1 free-space wavelength at 1.8 GHz. Air is used as the dielectric substrate. A Wilkinson power combiner is connected to the feeds to generate circular polarization. The antenna possessed a 14-dB return loss bandwidth of 35% (from 1.49 to 2.12 GHz), and has a 3-dB axial ratio bandwidth of 20.4% (from 1.67 to 2.05 GHz). The 3-dB axial ratio beamwidth and the boresight axial ratio are 84° and 1.94 dB at 1.8 GHz, respectively.

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Antennas and Propagation, IEEE Transactions on  (Volume:53 ,  Issue: 1 )