Abstract
A highly sensitive, tunable, low-loss quasi-optical millimeter wave FM noise measurement system has been constructed. It utilizes a matched, easily tunable quasi-optical cavity in reflection, acting as a carrier suppression filter. It can operate with matched cavity Qs of several hundred thousand with almost zero insertion loss to provide an extremely high discriminator slope at low power levels. The FM noise measurement system can allow direct measurement of phase locked sources at low input power levels over ultrawideband frequency ranges. >
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