Circularly polarized antenna having improved axial ratio

Details Circularly polarized antenna having improved axial ratio Circularly polarized antenna having improved axial ratio

2005-10-04

2005-10-04

Chen, Shih-Chao (Department: 2821)

Communications: radio wave antennas

Antennas

Microstrip

C343S824000, C343S910000

Reexamination Certificate

active

06952184

ABSTRACT:
A circularly polarized antenna system having improved axial ratio is disclosed. The antenna system comprises a circularly-polarized antenna, and a high-impedance buffer surface, surrounding the circularly polarized antenna, and disposed between the circularly polarized antenna and a ground plane. The width of the high-impedance buffer surface between the circularly-polarized antenna and the ground plane is selected to achieve an H-plane radiation pattern substantially identical to an E-plane radiation pattern over a desired scan angle.

REFERENCES:
patent: 6529166 (2003-03-01), Kanamaluru
D. Sievenpiper, J. Schaffner and J. Navarro, “Axial ratio improvement in aperture antennas using high-impedance ground plane,” Electronics Letters, Nov. 7, 2002, vol. 38, No. 23, pp. 1411-1412.

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