Horn antennas have a long history, traced in part in the collection of papers by Love together with papers on every other horn topic. Horns have a wide variety of uses, from small-aperture antennas to feed reflectors to large-aperture antennas used by themselves as medium-gain antennas. Horns can be excited in any polarization or combination of polarizations. The purity of polarization possible and the unidirectional pattern make horns good laboratory standards and ideal reflector feeds. Horns also closely follow the characteristics predicted by simple theories.

A rectangular horn has extra parameters, which we can use to design various optimum horns. Given a desired gain, we can design any number of horns with the same gain. Any optimum design depends on the requirements. Without any particular requirements, we will pick an antenna with equal E- and H-plane 3-dB beamwidths , but even this does not determine the design totally. If we pick a constant slant radius and vary the aperture width, the gain increases with increasing aperture width, but the quadratic phase error loss increases faster and produces a maximum point.

Horn Antenna

• Introduction

• Rectangular horn (Pyramidal)

• Beamwidth

• Optimum Rectangular Horn

• Phase Center

• Circular-Aperture Horn

• Beamwidth

• Phase Center

• Circular (Conical) Corrugated Horn

• Scalar Horn

• Corrugation Design

• Choke Horns

• Rectangular Corrugated Horns

• Ridged Waveguide Horns

• Box Horn

• Biconical Horn