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Isolation enhanced circularly polarized patch antenna array using modified electric‐field‐coupled resonator
Author(s) -
Li Jianxing,
Shi Junwei,
Feng Kai,
Xiao Zhicheng,
Chen Juan,
Zhang Anxue
Publication year - 2019
Publication title -
international journal of rf and microwave computer‐aided engineering
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.335
H-Index - 39
eISSN - 1099-047X
pISSN - 1096-4290
DOI - 10.1002/mmce.21560
Subject(s) - ground plane , resonator , patch antenna , microstrip , microstrip antenna , antenna (radio) , impedance matching , dielectric resonator antenna , electric field , optics , acoustics , physics , materials science , engineering , electrical impedance , electrical engineering , quantum mechanics
A modified electric‐field‐coupled (MELC) resonator featuring negative permittivity is proposed to enhance the inter‐element isolation of a circularly polarized (CP) patch antenna array operated at Chinese compass navigation satellite system (CNSS) downlink band. The resonator comprises two capacitive gaps and a common inductive strip connected to the ground plane by two metal vias. A suspended microstrip line excitation is employed to efficiently design and investigate the MELC resonator whose constitutive parameters are subsequently extracted. A dual‐element CNSS antenna array has been prototyped and measured. The experimental results demonstrate that under the assistance of the proposed MELC resonator, a mutual coupling reduction of 15 dB has been achieved while maintaining good impedance matching and CP radiation performance. Details of the design considerations along with simulation and measurement results are presented and discussed.