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2024-08-24
Compact Wideband Wide-Beam Circularly Polarized Loop Antenna Using Sequential Rotation Feeding Technology
By
Progress In Electromagnetics Research C, Vol. 147, 55-63, 2024
Abstract
In this paper, a wideband wide-beam circularly polarized (CP) antenna excited by sequential rotation feeding technology is proposed. The antenna is primarily constituted of a loop radiating element and a reactive impedance structure (RIS) cavity. The loop radiator is stimulated by a curved feeding line through six slots etched on the ground, thereby enabling the antenna to achieve broadband performance. In order to achieve a wide 3-dB axial-ratio beamwidth (ARBW), as well as exhibit less effect on the half-power beamwidth (HPBW), a RIS cavity is introduced beneath the loop radiator. To validate the proposed structure, a prototype was constructed and subjected to a series of tests. The results indicate that the bandwidth of the antenna is 187.5% (0.11~3.41 GHz) under a 10-dB return loss. In the frequency band spanning from 1.07 GHz to 2.1 GHz, the AR is less than 3 dB, yielding a bandwidth of 64.98%. Furthermore, at the frequencies of 1.2 GHz, 1.5 GHz, and 1.8 GHz, the proposed antenna demonstrates wide beam characteristics, with the HPBW exceeding 90°, and the 3-dB ARBW within 162°- 224°. In addition, since no extra feeding network is utilized, the antenna is compact in size.
Citation
Sihan Liu, Hongmei Liu, Youjie Zeng, Yanjie Pei, and Zhongbao Wang, "Compact Wideband Wide-Beam Circularly Polarized Loop Antenna Using Sequential Rotation Feeding Technology," Progress In Electromagnetics Research C, Vol. 147, 55-63, 2024.
doi:10.2528/PIERC24070301
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