Single Feed Low Profile Omnidirectional Antenna with Slant 45∘ Linear Polarization

It is shown that a side-fed bifilar helix antenna with a single feed, can generate a slant 45 linearly polarized omnidirectional toroidal pattern. The antenna has a low profile and does not require a ground plane. The bifilar helix antenna provides slant 45 polarization over a solid angle of almost steradians as compared to a crossed dipole which generates a tilted 45 linearly polarized pattern only over a solid angle of steradians. The computed results are validated by experimental data.