Earth Terminal Subsystem Study. Volume 4 - Transmitter Combining for Simultaneous Transmission of FDMA and TDMA Carriers.
Final technical rept.,
COMPUTER SCIENCES CORP FALLS CHURCH VA
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This report addresses alternative methods of combining high-power TDMA and FDMA X-band carriers for simultaneous transmission from Defense Satellite Communications System DSCS earth terminals. The TDMA signal is assumed to be in Channel 1 of the DSCS III frequency plan, with the FDMA carriers in Channels 2 and 6 on both sides of the TDMA signal. Three alternative diplexer configurations are described 1 a conventional bandpass filter 2 a band-stop filter and 3 a dual E-stub filter. The three configurations are evaluated in terms of insertion loss, phase linearity, and complexity. It is concluded that the bandpass filter approach is the preferred approach, based on its low-loss characteristics and its design simplicity. Author
- Radio Communications