volume | PIER Journals

Abstract

To effectively receive circularly polarized (CP) waves at large angles, it is necessary for antennas to have large axial ratio beamwidth (ARBW). For instance, geostationary satellite receiver antennas employed in regions with high latitudes necessitate a broad ARBW. In this paper, the mechanism to broaden ARBW is analyzed, and a CP antenna with low profile is designed and fabricated. With L-shaped branches and vertical extension segments (VESs), ARBW of the proposed antenna has been effectively broadened. Moreover, compared with recently reported wide ARBW artworks, it features a simple structure and feeding mechanism. The proposed antenna within the working bandwidth (from 4.79 to 4.95 GHz, 3.3%) achieves a 3 dB ARBW of 243° in the φ= 0° plane while the 3 dB ARBW reaches 199° in the φ= 90° plane. The measured results agree well with the simulated ones.

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Ms. Wenying Lu

Dr. Xiao Ding

Prof. Wei Shao