[asac][almanews] ALMA Memo 469 Released

[Stacy Oliver]

ALMA MEMO #469

A Broadband Waveguide Thermal Isolator

J. L. Hesler , A. R. Kerr ¹ and N. Horner ¹

University of Virginia Dept. of ECE, Charlottesville, VA 22902
¹National Radio Astronomy Observatory, Charlottesville, VA 22903

2003-05-30

Keywords: Waveguide components, waveguide transitions, thermal isolators

This paper describes a new, compact, waveguide thermal isolator. The isolator is
based on a recently developed microwave bandgap joint, a periodic structure which
suppresses microwave fields propagating between two parallel conducting surfaces.
When such a structure is placed between a pair of waveguide flanges, the flanges
can be separated by a few percent of a wavelength before the leakage and mismatch
become significant. The thermal isolator is relatively immune to misalignment and
cocking. Simulations and measurements on WR-10 thermal isolators indicate excellent
performance over the entire waveguide band. The design is readily scalable to other
waveguide bands.

View a pdf version of ALMA Memo #469.
http://www.alma.nrao.edu/memos/html-memos/alma469/memo469.pdf

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