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A low‐profile circularly polarized dielectric patch antenna with bandwidth expansion
Author(s) -
Chen JianXin,
Wang XueYing,
Huang YeXin,
Yang LingLing,
Tang ShiChang
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.22526
Subject(s) - broadband , bandwidth (computing) , axial ratio , dielectric , physics , degenerate energy levels , optics , dielectric resonator antenna , resonator , circular polarization , materials science , optoelectronics , telecommunications , microstrip , computer science , quantum mechanics
A new technology for expanding the axial ratio (AR) bandwidth of the circularly polarized (CP) dielectric patch (DP) antenna while maintaining the low‐profile characteristic is proposed for the first time. By making full use of the multimode characteristic of the DP resonator, two pairs of degenerate modes (ie, TM 101 and TM 011 , TM 121 and TM 211 ) are selected for the broadband design. The key to the proposed technology is that according to the EM field distribution of the two pairs of degenerate modes, four air holes are introduced in the DP and their position and size are elaborately designed to discriminately control the frequency of the two pairs of degenerate modes. Then, these modes become close and are merged to effectively expanding the AR bandwidth of the low‐profile CP DP antenna. For demonstration, a prototype centered at about 10 GHz is designed, fabricated, and measured. The measured results exhibit that the proposed CP DP antenna with a low profile of 0.07 λ 0 owns a 3 dB AR bandwidth of 9.7% and a peak gain of 7.66 dBic. Good agreement is observed between simulated and measured results.