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A dual‐band microstrip antenna using a circular ring and a concentric disk
Author(s) -
Gan Bohua,
Zhou Liang,
Zhang YaoPing,
Mao JunFa
Publication year - 2016
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.20963
Subject(s) - concentric , radius , patch antenna , microstrip , microstrip antenna , electrical impedance , ring (chemistry) , microwave , bandwidth (computing) , impedance matching , optics , physics , antenna (radio) , materials science , geometry , electrical engineering , telecommunications , mathematics , engineering , computer science , chemistry , computer security , organic chemistry , quantum mechanics
A dual‐band microstrip antenna using a differentially driven annular ring and a single‐ended concentric circular disk is reported. The ring is designed in the TM 12 mode at a lower frequency f l and the disk in the TM 11 mode at a higher frequency f h . It is found that the mutual loading perturbs the resonant frequencies and thus the outer and inner radii of the ring and the radius of the disk calculated from the cavity models need to be slightly adjusted. More importantly, it is also found that the mutual loading affects the gains and may reduce the gain of the disk antenna substantially. The cavity‐model design formulas to determine the ring and disk dimensions are modified to account for their mutual loading between the ring and disk. It is shown that the differentially driven ring has an improved current distribution, a better impedance matching, and an enhanced impedance bandwidth. Moreover, a higher gain is obtained for the disk. A design sample for f l = 2.45 GHz and f h = 5.3 GHz on an FR4 substrate was fabricated. Simulated and measured results agree satisfactorily. © 2016 Wiley Periodicals, Inc. Int J RF and Microwave CAE 26:268–276, 2016.