Multitrunk high-frequency multiplexing of antenna-waveguide channels
Abstract
The number of powerful transmitters feeding into a common antenna-waveguide channel can be increased by nonresonance high-frequency multiplexing of that channel. Sequential pairwise combining of signals from the transmitters can be achieved either according to an amplitude-difference scheme or a phase-difference scheme. In the first case the ratio of amplitudes varies periodically with the frequency and tends to 1 as its geometric mean, while the phase difference remains exactly +90 deg or -90 deg. In the second case the difference of phases varies periodically and tends to 0 or 180 deg., while the ratio of amplitudes remains exactly 1. Nonresonance multiplexing systems feature a higher electric strength, a better structural decoupling of inputs, smaller phase distortions and lower insertion losses than resonance-type multiplexing systems with band separation or elimination filters. Here for illustration are described the design and performance characteristics of such a multiplexing system which combines signals from six 3 kW - 6 GHz transmitters, each operating within a 34 MHz band with a 50 MHz separation between center frequencies of adjacent bands.
- Publication:
-
USSR Rept Electron Elec Eng JPRS UEE
- Pub Date:
- March 1984
- Bibcode:
- 1984RpEEE....S...4M
- Keywords:
-
- Antenna Feeds;
- Antennas;
- High Frequencies;
- Transmitters;
- Waveguides;
- Multiplexing;
- Resonance;
- Signal Distortion;
- Communications and Radar