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Effects of slotted and photonic bandgap ground planes on the characteristics of an air‐substrate annular‐ring patch antenna in the TM 21 mode
Author(s) -
Lin ShunYun,
Wong KinLu
Publication year - 2001
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.1339
Subject(s) - ground plane , optics , radiation , patch antenna , microwave , bandwidth (computing) , conical surface , materials science , optoelectronics , radiation pattern , microstrip antenna , electrical impedance , antenna (radio) , electrical engineering , physics , engineering , telecommunications , composite material
Abstract This paper presents an experimental study on the characteristics of annular‐ring patch antennas with slotted and photonic bandgap (PBG) ground planes for operation in the higher order TM 21 mode for conical‐pattern radiation. The antenna studied has an air–layer substrate, and is fed using a probe feed. Experimental results show that, for the case with a slotted ground plane, greatly lowered resonant frequency and enhanced impedance bandwidth can be obtained compared to the case with a regular ground plane. However, the front‐to‐back radiation ratio is greatly lowered. As for the case with a PBG ground plane, the impedance bandwidth is also enhanced. On the other hand, the resonant frequency is slightly increased, and the front‐to‐back radiation ratio is improved. Details of the experimental results are presented and discussed. © 2001 John Wiley & Sons, Inc. Microwave Opt Technol Lett 31: 1–3, 2001.