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Patent

Monopulse antenna apparatus

TLDR
In this article, a single horn with four internally inserted dielectric bars acts as if it is partitioned into four horns, and the four bars are excited by externally applied electromagnetic waves.
Abstract
A monopulse antenna apparatus and antenna structure comprising a single horn having four dielectric bars which are internally inserted into the horn and symmetrically positioned along the axis of the horn. Each one end of the bars are fixed to the end wall of a rectangular waveguide and the other end is extending outwardly along the axis of the rectangular waveguide, thus these four dielectric bars are excited by externally applied electromagnetic waves. The four dielectric bars respectively cause the electric field to converge on the bars, and the single horn with four internally inserted dielectric bars acts as if it is partitioned into four horns.

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Citations
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References
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Patent

Multimode antenna feed system having a plurality of tracking elements mounted symmetrically about the inner walls and at the aperture end of a scalar horn

TL;DR: An antenna feed system employing a plurality of tracking elements mounted symmetrically about the inner walls and at the aperture end of a scalar horn is described in this article. But the tracking elements have a single axis of directivity coincident with the axis of indirectivity.
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Broadband multimode horn antenna

TL;DR: In this article, a horn antenna capable of generating a pattern with rotational symmetry and polarization purity over a broadband of frequencies with comparatively low side lobes is presented, where a first mode which propagates as a ''slow wave'' is launched through a first portion of the horn and is converted to a '''''fast wave'' through the remaining portion.
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Mono pulse horn antenna device

TL;DR: In this article, a horn consisting of horn single bodies 130a, 130b, waveguides 131-134 are connected to a precomparator to form a mono pulse pattern in the E and H planes so as to excite TE10, TE20 and TE30 modes to the single bodies 13a, 13b.