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Bandwidth enhancement of the omni‐directional and circularly‐polarized EZR‐MZR antenna
Author(s) -
Peng Lin,
Wang BingZhong,
Wang Bo,
Jiang Xing,
Li Simin,
Ruan Chengli
Publication year - 2021
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.22731
Subject(s) - bandwidth (computing) , resonator , axial ratio , optics , physics , circular polarization , amplitude , dipole , electrical impedance , polarization (electrochemistry) , telecommunications , microstrip , chemistry , engineering , quantum mechanics
As electric and magnetic dipoles with inherent 90° phase difference (PD) can be easily realized by forming a circular array of the epsilon‐zero resonance and mu‐zero resonance (EZR‐MZR) resonators, high design efficiency can be expected for low‐profile, omni‐directional and circularly polarized (CP) antenna designing. However, high Q factor of the EZR‐MZR resonator makes narrow bandwidth. This research is dedicated to enhance the bandwidth. Low Q factor and multi‐resonances techniques are utilized to enhance the impedance bandwidth. While polarization compensation technique is applied to improve the axial ratio (AR) bandwidth by tuning the amplitudes and PD of the orthogonal vectors. The proposed antenna obtains a − 10 dB impedance band of 1.370 to 1.690 GHz (20.91% at 1.530 GHz) and a 3 dB axial ratio (AR) band of 1.260 to 1.580 GHz (22.53% at 1.42 GHz). The diameter and profile of the proposed antenna are 0.402 λ and 0.082 λ , respectively.