Miniaturized broadband circularly polarized slot antenna with good gain characteristics

IEICE Electronics Express

article

Lanling Tang¹  Yongzhong Zhu¹  Wenxuan Xie¹  Hefeng Zhao¹  Tongtong Peng¹  Yufei Yang¹ 

[1]Dept. of Information Engineering, the Engineering University of the People’s Armed Police

关键词: miniaturization;    broadband circular polarization;    flat gains;    slot antenna;   

DOI  :  10.1587/elex.18.20210378

学科分类：电子、光学、磁材料

来源: Denshi Jouhou Tsuushin Gakkai

【 摘 要 】

A broadband circularly polarized (CP) flower-shaped slot antenna is presented and experimentally studied in this paper. Circular polarization radiation is achieved by a flower-shaped (composed of six ellipses) slot of this antenna. And the irregularly shaped patch with a stub in the center of the slot provides a broad impedance and axial ratio bandwidth. After the prototype is manufactured and tested, it is shown that the measurement results are consistent with the simulation results. The measured results indicate that the proposed antenna has a 3-dB axial ratio bandwidth (ARBW) of 50.7% (from 1.68 to 2.82GHz) at a CP center frequency of 2.2GHz, and a wide -10-dB impedance bandwidth (IBW) of 67.0% (from 1.62 to 3.25GHz). The antenna occupies an overall volume of 0.28λl×0.28λl×0.005λl (λl is the free-space wavelength at fl, fl=1.68GHz). And the gain values fluctuate slightly within 1.68 to 2.82GHz, and the variation is less than 0.5dBic. In particular, the gain at low frequencies is outstanding compared with similar antennas.

【 授权许可】

CC BY