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Quadrifilar helix antenna with parasitic helical strips
Author(s) -
Chow Yan Wai,
Yung Edward Kai Ning,
Hui Hon Tat
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.1241
Subject(s) - helical antenna , strips , axial ratio , bandwidth (computing) , circular polarization , helix (gastropod) , microwave , optics , electrical engineering , engineering , omnidirectional antenna , physics , antenna (radio) , coaxial antenna , materials science , telecommunications , microstrip , geology , paleontology , snail , composite material
An omnidirectional quadrifilar helix antenna (QHA) with parasitic helical strips for circular polarization (CP) is proposed and experimentally investigated for handheld mobile terminals. This antenna is small in size, low cost, and lightweight. The mutual coupling effect between the grounded helical strips and the feeding helical arms provides a good impedance match, a smaller axial ratio, and wider hemispherical coverage. The impedance bandwidth corresponding to SWR<2 and bandwidth with respect to the axial ratio <3 dB are found to be 39% and 160 MHz at 3.64 GHz, respectively. © 2001 John Wiley & Sons, Inc. Microwave Opt Technol Lett 30: 128–130, 2001.