A Wideband Waveguide Antenna with Nearly Equal E- and H-Plane Radiation Patterns

A Wideband Waveguide Antenna with Nearly Equal E- and H-Plane Radiation Patterns

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A novel wideband waveguide antenna with excellent performance is proposed, which is composed of a coaxial-waveguide transition and an open-ended rectangular waveguide loaded with read more a pair of horizontal umbrella-shaped metallic brims.The brims perpendicular to two broad walls of the waveguide are constructed to modulate the antenna to radiate nearly identical E- and H-plane radiation patterns.A wideband impedance matching performance is achieved with a fractional bandwidth of 40% through the introduction of short-stepped ladders.

The antenna has the advantages click here of simple structure, symmetric radiation pattern, low-cross polarization, moderate back lobe, and almost constant beamwidth.