Beyond-Decade Ultrawideband Quad-Ridge Flared Horn With Dielectric Load From 1 to 20 GHz
Journal article, 2023

In this article, we present a novel dielectrically loaded quad-ridge flared horn (QRFH) as a reflector feed with beyond-decade ultrawideband performance. The dielectric is machined in a low-loss, space-grade polyimide specified with low outgassing for a vacuum environment. The feed covers 1–20 GHz bandwidth with a measured band-average input reflection of −13.6 and 41.5 dB isolation between two orthogonal polarized ports. Predicted performance in a paraboloidal reflector with a 60° half-subtended angle is 62% aperture efficiency average over the band. The ridges of the horn are designed with analytic-spline-hybrid 3-D profiles with thickness flaring outwards toward the feed aperture, improving low-frequency polarization properties. The QRFH was manufactured in four quarters for accurate ridge-to-ridge alignment and a reduced number of interfaces for good thermal properties in cryogenic applications. A prototype feed has been installed and tested with promising results in one of the 6 m offset Gregorian reflectors of the Allen Telescope Array (ATA) located at the Hat Creek Observatory, Hat Creek, CA, USA.

Dielectric materials

ultrawideband (UWB) antennas

quad-ridge flared horn (QRFH)

radio astronomy

reflector feed


Jonas Flygare

Chalmers, Space, Earth and Environment, Onsala Space Observatory

Jian Yang

Chalmers, Electrical Engineering, Communication, Antennas and Optical Networks

Alexander W. Pollak

SETI Institute

Robert E. J. Watkins

University of Oxford

Fiona Hillier

Independent Researcher

Leif Helldner

Chalmers, Space, Earth and Environment, Onsala Space Observatory

Sven-Erik Ferm

Chalmers, Space, Earth and Environment, Onsala Space Observatory

IEEE Transactions on Antennas and Propagation

0018926x (ISSN) 15582221 (eISSN)

Vol. 71 3 2110-2125 10015677


Onsala Space Observatory

Subject Categories

Electrical Engineering, Electronic Engineering, Information Engineering



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