Premium
A complementary split‐ring array for compact decoupling 2 × 2 circularly polarized antenna
Author(s) -
Gao Di,
Cao Zhenxin,
Quan Xin,
Xu Changzhi,
Chen Peng
Publication year - 2021
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.32737
Subject(s) - decoupling (probability) , physics , optics , ground plane , microstrip , polarization (electrochemistry) , amplitude , coupling (piping) , radiation , microstrip antenna , topology (electrical circuits) , antenna (radio) , telecommunications , engineering , electrical engineering , chemistry , control engineering , mechanical engineering
In this letter, a complementary split‐ring array (CSRA) for decoupling compact (edge‐to‐edge spacing of 0.078 λ 0 ) 2 × 2 circularly polarized (CP) microstrip antenna is proposed. The CSRA is the ground plane with the etched split‐ring array (SRA) which is composed of 12 split‐rings. Each element is surrounded by four etched split‐rings, and the two adjacent elements share the same etched split‐ring between them. The decoupling mechanism of the CSRA is to alter the amplitude and phase of the original coupling field and make the polarization of the adjusted coupling field mismatch with the receiving field. To verify the idea, the 2 × 2 CP antennas with and without CSRA are simulated and measured. The experimental results show that the maximum mutual coupling reduction is 29.6 dB for S 12 , 23.6 dB for S 14 , and 5.6 dB for S 13 . Meanwhile, the impedance bandwidth and radiation characteristics remain almost unchanged. The measured results agree well with the simulated results, which showed new light on application of the proposed CSRA for multiple‐input‐multiple‐output systems.