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Design of broadband circularly polarized antenna via loading coupled rotated dipoles
Author(s) -
Zhao Zhipeng,
Li Yapeng,
Wang Le,
Tang Zhaoyang,
Yin Yingzeng
Publication year - 2019
Publication title -
microwave and optical technology letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.304
H-Index - 76
eISSN - 1098-2760
pISSN - 0895-2477
DOI - 10.1002/mop.31586
Subject(s) - broadband , bandwidth (computing) , dipole antenna , dipole , optics , physics , circular polarization , axial ratio , radiation pattern , turnstile antenna , optoelectronics , coaxial antenna , antenna (radio) , telecommunications , engineering , microstrip , quantum mechanics
A broadband circularly polarized (CP) antenna with coupled rotated dipoles is presented. A pair of coupled rotated dipoles and four coupled pads are the key components of the antenna to expand the working bandwidth. The pair of coupled dipoles, sequentially rotating around the crossed dipole, is employed to induce new resonance to enhance the operation bandwidth. To further improve the bandwidth, four coupled pads grounded by metal posts are introduced to generate an additional resonance. The simulated prototype was fabricated and measured to confirm the correctness of the design. The results demonstrate that the antenna obtains a broad impedance bandwidth (IBW) of 95.0% (1.16‐3.26 GHz) for |S11| < −10 dB and a wide axial ratio bandwidth (ARBW) of 85.5% (1.24‐3.09 GHz). More importantly, it has a good unidirectional right‐hand circular polarized (RHCP) radiation pattern with an excellent performance in 3 dB gain bandwidth of 78.0% (1.25‐2.85 GHz).