Broadband phase equalizing technique for combining high power TWTs
Abstract
A phase equalizing technique is described for overcoming the phase mismatches which occur when several high-power broadband TWTs are combined in a CW 9 GHz amplifier for EW applications. Since fine-grain phase equalizers are not readily available, a technique is shown for converting the fine-grain characteristics of the well-established gain equalizer technology from the amplitude domain to the phase domain. This phase equalizer utilizes two gain equalizers in a quadrature arrangement. A brief description of a gain equalizer is presented, followed by an illustration of the translation of the gain equalizing properties into an equivalent phase-equalizing network suitable for feeding a pair of matched TWTs. Once the phase equalizer is set to match the two TWTs, the resulting amplitude variation is limited to approximately 3 dB, and the level of the two outputs of the phase equalizer tracks typically within 1.5 dB.
- Publication:
-
Microwave Journal
- Pub Date:
- December 1988
- Bibcode:
- 1988MiJo...31..107E
- Keywords:
-
- Broadband;
- Jamming;
- Phase Matching;
- Power Efficiency;
- Traveling Wave Tubes;
- Amplitude Modulation;
- Phase Error;
- Phase Modulation;
- Time Lag;
- Electronics and Electrical Engineering