[asac][almanews] ALMA Memo 494 Released

[Stacy Oliver]

ALMA MEMO #494 

MF-112 AND MF-116: Compact Wavguide Loads And FTS Measurements At Room
Temperature And 5 K 

A. R. Kerr (1), H Moseley (2), E. Wollack (2), W. Grammer (3),
G. Reiland (3), R. Henry (2), K.P. Stewart (4)
 
1 National Radio Astronomy Observatory, Charlottesville, VA 22903.
2 Goddard Space Flight Center, Greenbelt, MD 20771.
3 National Radio Astronomy Observatory, Tucson, AZ 85721.
4 Naval Research Laboratory, Washington, DC 20375

2004-05-14 

In many applications it is convenient to have a compact waveguide load which
is well matched
but occupies a minimum of space. In this memo we describe measurements on
compact WR-10 and 
WR-3.7 waveguide loads of three configurations, and also Fourier transform
spectrometer (FTS)
measurements on samples of the Eccosorb MF-112 and MF-116 absorbing
materials used for these
loads. The measurements were made at room temperature and 4 K. From the FTS
measurements, the
attenuation constant, effective characteristic impedance and effective
dielectric constant in
the frequency range 400 GHz -2.5 THz are deduced. 

View a pdf version of ALMA Memo #494. 
http://www.alma.nrao.edu/memos/html-memos/alma494/memo494.pdf
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