Title:
High performance smooth-walled horns for THz waveguide applications
Author(s):
Thomas Tils, Axel Murk, David Rabanus, C.E. Honingh, Karl Jacobs
Source:
Proceedings of 16th International Symposium on Space Terahertz Technology, Götheborg
Vol./Issue/Date:
2.-4. Mai
Year:
2005
Page(s):
5
Keywords:
Abstract:
For the coupling from free space to waveguide
corrugated horns are presently the optimum choice. Currently
the extension of the waveguide technology towards THz frequencies,
e.g. with silicon micromachining techniques, looks very
promising, which increases the demand for THz horns. The
HIFI project has shown that even at submm frequencies it is
not easy to manufacture reliable corrugated horns for cryogenic
applications. For small corrugations it is difficult to avoid fluid
inclusions in the corrugations during electroforming. In addition
experience has shown that dust or small metal particles can
easily settle in between the corrugations and are very difficult to
remove. Smooth-walled horns do not have these disadvantages.
We will present measurements of a prototype smooth-walled horn
for 756-924 GHz. The horn is designed by C. Granet [1] and
manufactured by RPG [2]. The measurements were done at 800,
840 and 860 GHz with an AB-mm vector network analyzer at
the University of Bern. We have also simulated the performance
of the horn in CST Microwave Studio [3]. The simulation results
are in a good agreement with the measured data. With the
same measurement setup we measured a corrugated horn for
the HIFI band 2 Mixer Unit. We conclude that we can replace
the corrugated horn by a properly designed smooth-walled horn
without significant loss of performance. This is an important step
towards building THz waveguide mixers.
Document:
Reference Id:
65
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