ALMA Memo #295

Measurements of Quasi-Optical Windows with the HP 8510

An HP 8510 vector network analyzer was used to measure the reflection coefficient and transmission loss of a three-layer quasi-optical vacuum window and several reference samples in the frequency range 75-110 GHz. Time gating was used to reduce the effect of small reflections from waveguide flanges and optical components which otherwise seriously corrupt the measurement.

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Last modified: March 10, 2000