Varactor-tunable, high-Q microwave filter
Abstract
The selectivity of tunable microwave filters that employ varactors as the tunable element is limited by circuit and varactor losses. A tunable resonant element is described in which these losses are compensated by the negative resistance of an FET circuit. Experimental performance results are shown for single and two-section bandpass filters using these elements.
- Publication:
-
RCA Review
- Pub Date:
- December 1981
- Bibcode:
- 1981RCARv..42..691P
- Keywords:
-
- Bandpass Filters;
- Microwave Filters;
- Q Factors;
- Tuning;
- Varactor Diodes;
- Energy Dissipation;
- Frequency Control;
- Microwave Resonance;
- Negative Resistance Devices;
- Performance Tests;
- Resonant Frequencies;
- Electronics and Electrical Engineering