Wide band waveguide fed linearly polarized MM wave omnidirectional antenna

Present paper details the design, simulation, and optimization of a waveguide fed linearly polarized omni-directional antenna at millimeter wave frequency. The proposed antenna is λ/4 monopole antenna which is fed by standard rectangular waveguide WR-28. The antenna consists of a radiating metallic pin, circular ground plane, rectangular waveguide and Teflon radome. Finite element method based ANSYS's HFSS electromagnetic simulator tool has been used for design analysis of the antenna. TE
₁₀
dominant mode of rectangular waveguide has been used to generate required radiation pattern. The radiation pattern of the antenna depends on metallic pin size and its position in a waveguide. The antenna has 360 degree coverage in the azimuth plane and -5 to 60 degree in the elevation plane. The proposed antenna is low profile, light weight, wide band, low cost and easier to fabricate. The antenna has the 17% impedance bandwidth. The simulated peak gain of the antenna is 2.8 ± 0.5 dBi over the frequency range 32 to 37 GHz.