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Omni-Directional Helix Antenna with Perfect Circular Polarization
Omni-directional antennas are essential for communication, when the direction of arrival of the transmitted signal unknown. Omni-directional antenna with good circular polarization and larger axial ratio beamwidth is very useful since it provides polarization diversity as well. Helix omni-directional antenna provides 0dB AR in almost complete sphere (4xpi solid angle) when compared, for example, with 3dB AR solid angle of crossed dipole which is only 1.14xpi.
(a)
(b)
Side fed bifilar with 230 turn angle (a) schematic (b) photograph
Measured and simulated relative power plots in XZ elevation plane
[refer to Fig. 1(b)] of a 230 side fed bifilar helix antenna at resonant frequency.
Predicted and measured percentage bandwidth and ratio of vertical to horizontal gain of side-fed bifilar helix antenna versus turn angle.
Measured and simulated relative power plots in XY azimuth plane
[refer to Fig. 1(b)] of a 230 side fed bifilar helix antenna at resonant frequency.
Measured and simulated radiation patterns of crossed dipole in XZ plane at resonant frequency.
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