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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.


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Last modified: 2004-05-18

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