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A dual polarized aperture coupled circular patch antenna using a C-shaped coupling slot

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4 Author(s)
Padhi, S.K. ; Molecular Sci. Div., Commonwealth Sci. & Ind. Res. Organ., Melbourne, Vic., Australia ; Karmakar, N.C., Sr. ; Law, C.L. ; Aditya, S., Sr.

The design and development of a dual linearly polarized aperture coupled circular microstrip patch antenna at C-band are presented. The antenna uses a novel configuration of symmetric and asymmetric coupling slots. Variations in isolation between orthogonal feedlines and antenna axial ratio with the position of coupling slots are studied and broadband isolation and axial ratio are achieved. The prototype antenna yields 7.6 dBi peak gain, 70° 3-dB beam width, 25 dB cross-polarization levels and an isolation better than 28 dB between the two ports. With an external quadrature hybrid coupler connected to the two orthogonal feedlines, the antenna yields 3-dB axial ratio bandwidth of more than 30% at 5.8 GHz.

Published in:

Antennas and Propagation, IEEE Transactions on  (Volume:51 ,  Issue: 12 )

Date of Publication:

Dec. 2003

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