Derivation of Conditions for the Normal Gain Behavior of Conical Horns

Abstract

Monotonically increasing gain-versus-frequency pattern is in general expected to be a characteristic of aperture antennas that include the smooth-wall conical horn. While optimum gain conical horns do naturally exhibit this behavior, nonoptimum horns need to meet certain criterion: a minimum axial length for given aperture diameter, or, alternatively, a maximum aperture diameter for the given axial length. In this paper, approximate expressions are derived to determine these parameters.

Performance Comparison of Pyramidal Horns Loaded With Metal Baffle or With Metamaterial

“…In [12], triangular E-plane metal baffle loading approach has been proposed to overcome these shortcomings of the planar metal baffles-loaded horn. The horn proposed in [12] exhibits monotonically increasing gain behavior, a salient feature of the horn antenna [2,17,18], a return loss of better than 15 dB over the entire X-band, and improved cross-polarization level.…”