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A Circularly Polarized Antenna With Wide Axial Ratio Beamwidth

2009; IEEE Antennas & Propagation Society; Volume: 57; Issue: 10 Linguagem: Inglês

10.1109/tap.2009.2029370

1558-2221

Ka Ming Mak, Kwai‐Man Luk,

Energy Harvesting in Wireless Networks

A novel circularly polarized (CP) antenna with wide angular coverage is presented. The proposed antenna is formed by two bowtie patch antennas and two electric dipoles. It can achieve an impedance bandwidth (SWR < 1.6) of 41% and a 3-dB axial ratio bandwidth of 33%. For this design, very stable and symmetrical radiation patterns are obtained. In the axial ratio passband, the 3-dB beamwidth is 85 deg plusmn2 deg with a gain of 6.3 dBi plusmn0.3 dBi. The cross polarization is lower than -15 dB over a wide range of angles. For the entire half-power beamwidth, the axial ratio can be kept below 3 dB.