Broadband compact smooth horn with flat‐top radiation pattern

Abstract

A broadband compact smooth horn with flat-top radiation pattern is presented in this Letter. Using a large flare angle, the whole length of the horn is reduced to 1.875λ c (λ c is the wavelength of 95 GHz) and the TE 21 mode and higher order electromagnetic modes can be excited to exhibit flat-top radiation performance. The measured radiation pattern of the presented horn can achieve <1 dB amplitude ripple in a beam width range of ±10°at 85-105 GHz (21%) where the reflection coefficient is below −22 dB. It indicates that the broadband compact smooth horn with flat-top radiation pattern can be applied in wireless communication and reflector systems in the millimetre-wave band.

A Zero Placement Algorithm for Synthesis of Flat Top Beam Pattern With Low Sidelobe Level

“…Various robust algorithms [2]- [4] have been proposed to cater for the mismatch of DOA by putting in constraints to broaden the main beam. The Flat Top shaped beam pattern [5]- [9] is thus increasingly attractive due to its flat response to large DOA mismatch especially in high mobility scenario when the DOA changes more rapidly.…”