Theoretical study of the corrugated hard horn used as feed in multi-beam antennas for dual band operation at 20/30 GHz

Study of high‐efficiency corrugated hard‐horn antennas using classical approaches: Hard circular waveguide mode, phase factor, and aperture integration

“…We present several parametric studies of the hard horn with respect to frequency variation of the aperture distribution, the effects of the relative permittivity in the walls, and the bandwidth with respect to cross-polarization and aperture efficiency. Similar but far less extensive studies have previously been presented in [15] and also in [4], where the hard-waveguide solution is based on a numerical search for the modes using the numerical Green's functions implemented in the so-called G1DMULT code [12]. In this paper, we derive the modes analytically from the vector potentials.…”

“…A horn antenna with high aperture efficiency and low crosspolarization has interest for several applications. For instance, it may be used in arrays in order to decrease the spacing between the elements and at the same time keep the desired gain, as described in [1] and also mentioned in [2], or in cluster-fed reflector antennas, as in [3][4][5][6]. In the latter case, the high aperture efficiency makes it possible to place these elements close to each other without jeopardizing the requirements on beam isolation and smooth beam coverage.…”

“…In the latter case, the feed must cover both bands with a medium-to-high aperture efficiency and low cross-polarization. Recently, it has been shown that the hard-horn antenna may be able to provide this [4], as it is also a natural candidate for the single-band operation. The present work began with a trade-off study of different types of ideal horn feeds for Ka-band antenna systems [5], leading to the conclusion that horns with high efficiency are advantageous in these systems.…”