Microwave test apparatus and method
US4381485A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Feb 23, 1981 |
| Grant date | Apr 26, 1983 |
| Priority date | — |
| Expiry date | Feb 23, 2001 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01R27/04
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A method and apparatus for monitoring the resonant frequency and absorption level at resonance of an absorption type resonant cavity which involves providing a voltage controlled oscillator, applying to the control input of the voltage controlled oscillator a control signal having a main component V.sub.m and a dither component V.sub.d, splitting the output signal from the voltage controlled oscillator into a portion directed along a test path and a portion directed along a reference path, the reference path including an attenuator controlled by a voltage signal V.sub.k, directing the signal in the test path through the resonant cavity, splitting the signal emerging from the resonant cavity into a portion directed along a frequency detection path and a portion directed along a level detecting path, using the signal directed along the frequency detection path for generating a signal for changing the amplitude of V.sub.m until the center frequency of the output signal of the voltage controlled oscillator is at the resonant frequency f.sub.r of the cavity, and using the signal directed along the level detection path for changing V.sub.k until the level of the signal in the reference p…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.