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Performance results of a 300-degree linear phase modulator for spaceborne communications applications
| Content Provider | NASA Technical Reports Server (NTRS) |
|---|---|
| Author | Mueller, R. O. Mysoor, N. R. |
| Copyright Year | 1993 |
| Description | A phase modulator capable of large linear phase deviation, low loss, and wide band operation with good thermal stability was developed for deep space spacecraft transponder (DST) applications at X-band (8.415 GHz) and Ka-band (32 GHz) downlinks. The design uses a two-stage circulator-coupled reflection phase shifter with constant gamma hyperabrupt varactors and an efficient modulator driver circuit to obtain a phase deviation of +/-2.5 rad with better than 8 percent linearity. The measured insertion loss is 6.6 dB +/- 0.35 dB at 8415 MHz. Measured carrier and relative sideband amplitudes resulting from phase modulation by sine wave and square modulating functions agree well with the predicted results. |
| File Size | 440118 |
| Page Count | 10 |
| File Format | |
| Alternate Webpage(s) | http://archive.org/details/NASA_NTRS_Archive_19930015481 |
| Archival Resource Key | ark:/13960/t86h9gh0z |
| Language | English |
| Publisher Date | 1993-02-15 |
| Access Restriction | Open |
| Subject Keyword | Communications And Radar Extremely High Frequencies Sidebands Phase Modulation Varactor Diodes Broadband Superhigh Frequencies Sine Waves Transponders Phase Deviation Modulators Thermal Stability Downlinking Deep Space Network Insertion Loss Wave Functions Technology Utilization Ntrs Nasa Technical Reports Server (ntrs) Nasa Technical Reports Server Aerodynamics Aircraft Aerospace Engineering Aerospace Aeronautic Space Science |
| Content Type | Text |
| Resource Type | Article |
