An 18-40GHz Dielectric Loaded Compacted Broadband Stabilized Beam Feed Horn Antenna

This paper proposes a new dielectric loaded compacted broadband stabilized beam feed horn antenna for 18-40GHz parabolic antenna systems. Dielectric loading is introduced to the aperture of the corrugated horn, which effectively controls the 10-dB beamwidth of the horn within broadband while maintaining a compact size and high efficiency. A compact feed horn antenna for 0.443 focal diameter ratio parabolic reflector is designed, whose aperture size is
$\Phi=1.38\lambda$
. The simulation results show that the reflection coefficient is less than -10 dB in 17.48-40.31 GHz frequency range. In the band, the gain is
$9.75\pm 0.84\text{dBi}$
, and the radiation pattern is generally symmetric with a stable 10-dB beamwidth of
$115\pm 10^{\circ}$
.