Abstract
AbstractAn 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.
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