OPEN ENDED QUADRIFILAR HELIX SUITABLE FOR GPS RECEPTION

Abstract

In this paper, an open ended Quadrifilar Helical Antenna (QHA) is proposed. A Quadrifilar Helical Antenna with parasitic helical strips for circular polarization. The mutual coupling effect between the grounded helical strips and the feeding helical arms provides a good impedance match and wider hemispherical coverage. The impedance ranges from 40Ώ to 70Ώ for the frequencies 2.28 GHz to 2.52 GHz. The 3dB Bandwidth obtained is 1400. This antenna works well for wi- fi signals reflected off from building and moving vehicles. This antenna is also suitable for GPS receiving purpose. This antenna is small in size, low cost, and light in weight. Quadrifilar helix antennas are used in the lower microwave band, from L-band to X- band. Typical applications are for TT&C-links in satellites and narrow band data links. The other applications are in GPS- receivers, both in satellite based and ground based systems.