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Single‐layer wideband probe‐fed circularly polarized microstrip antenna
Author(s) -
Chiou TzungWern,
Wong KinLu
Publication year - 2000
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/(sici)1098-2760(20000405)25:1<74::aid-mop21>3.0.co;2-c
Subject(s) - wideband , standing wave ratio , microstrip antenna , bandwidth (computing) , optics , microstrip , patch antenna , wilkinson power divider , physics , electrical engineering , axial ratio , circular polarization , engineering , materials science , optoelectronics , power dividers and directional couplers , antenna (radio) , telecommunications , frequency divider
This paper presents a very wideband circular polarization (CP) design of a single‐layer probe‐fed circular microstrip antenna. Two gap‐coupled probe feeds having a concentric annular slot in the radiating patch to tune out the probe inductance are used. The two feeds are placed in orthogonal directions, and are connected to a Wilkinson power divider having a 90° phase shift between its two outputs. The present CP design with a thick air substrate has been implemented, and results show that a 65% impedance bandwidth (VSWR≤2) and a 46% 3 dB axial‐ratio CP bandwidth can be achieved. Within the CP bandwidth, the gain bandwidth, defined to be within 3 dB of the peak antenna gain obtained (about 6 dBi), is as large as 44.6%. © 2000 John Wiley & Sons, Inc. Microwave Opt Technol Lett 25: 74–76, 2000.