High-power satcom amp presents complex challenge
Abstract
In the design of an amplifier for satellite use, the unit's performance is of great importance because of its effect on the thermal and electrical design of the spacecraft. The present paper is concerned with an example of such an amplifier, taking into account a high-power UHF unit designed for a system proposed to provide mobile radio coverage of Canada and the U.S. from geosynchronous orbit. The proposed uplink band is in the range from 821 to 825 MHz, while the downlink is in the range from 866 to 870 MHz. A channel spacing of 5 kHz is envisioned. A multicarrier output of 100 W was chosen as the design reference. The amplifier configuration selected included 90-deg hybrids for power combining and splitting. Attention is given to evaluating devices, simple matching circuits, thermal considerations, and unit performance.
- Publication:
-
Microwaves
- Pub Date:
- July 1985
- Bibcode:
- 1985MicWa..24...79W
- Keywords:
-
- Amplifier Design;
- Microwave Amplifiers;
- Power Amplifiers;
- Spacecraft Communication;
- Spacecraft Electronic Equipment;
- Ultrahigh Frequencies;
- Carrier To Noise Ratios;
- Electrical Impedance;
- Performance Tests;
- Temperature Effects;
- Communications and Radar