Citation
Abstract
A breadboard single-section low-loss analog phase modulator with good thermal stability for a spacecraft transponder application has been analyzed, fabricated, and evaluated. A linear phase shift of 70 degrees with a linearity tolerance of +7 percent was measured for this modulator from 8257 to 8634 MHz over the temperature range -20°C to 75°C. The measured insertion loss and the static delay variation with temperature were within 2 +0.3 dB and 0.16 ps/°C, respectively. Four sections will be cascaded to provide the X-band (8415 MHz) phase modulator. The generic modulator design can also be utilized at 7950 to 8075 MHz followed by X4 multiplication to provide modulation of a Ka-band downlink signal.
Details
- Volume
- 42-96
- Published
- February 15, 1989
- Pages
- 172–178
- File Size
- 325.0 KB