A Dualband Coaxial Dielectric-loaded Feed horn

Abstract

A novel dualband hybrid-mode coaxial feed horn partially loaded by dielectric is proposed. It has a simple structure and demonstrates good electrical performance over wide frequency range within each operating frequency band, when separation between operating bands is 3:1 or more.

Multiband feed using coaxial configuration

“…However, design of a multiband feed horn is very challenging primarily because (a) the input waveguide of the horn will have “multiple modes” problem at the high frequency bands, and (b) it is difficult to achieve similar edge tapers for all the bands (a reflector feed should provide similar edge taper to maintain good overall beam efficiency for all bands). Many papers are available in the literature dealing with multiband feed design [1–12]. Vita and Manoli used four dielectric rod antennas and a conical horn to radiate at Ku, K and Ka bands [1].…”

“…Matching irises and chokes are employed in their design. In [5], Dubrovka et al used a dielectric loaded linearly tapered coaxial horn structure for a dual band operation. A flared or corrugated horn with multiple excitation ports were also employed to operate at two or more frequency bands [6–9].…”

“…In this article, we present an analysis and design of a dual‐aperture coaxial feed that operates over multiple bands. The general topology of the structure is similar to that presented in [4, 5]. The feed has two independent concentric radiating apertures; one of annular ring shape and the other of circular shape as shown in Figure 2.…”