Title :
An X-band, 2.5 watt continuous wave dielectric resonator oscillator for future military systems
Author_Institution :
US Army LABCOM. Fort, Monmouth, NJ, USA
Abstract :
A 9 GHz dielectric resonator oscillator (DRO) generating a continuous wave (CW) power output of 2.5 watts at room temperature has been designed and fabricated by incorporating a high power GaAs FET amplifier and a dielectric resonator (DR) in a feedback loop oscillator configuration. The DC to RF conversion efficiency of this DRO is about 11%. The oscillator exhibits a frequency stability of less than 130 ppm over the temperature range of -50°C to +50°C. Measured single-sideband phase noise levels are -105 dBc/Hz and -135 dBc/Hz at 10 kHz and 100 kHz carrier offset frequencies, respectively. The output power varies from +35 dBm (3.2 watts) at -50°C to +33 dBm (2 watt) at +50°C. The DRO output power is fed into a single-stage GaAs FET amplifier, resulting in a total power output of 6.5 watts at X-band. The overall efficiency of the 6.5 watt DRO unit is about 12%. The pulse power capability of the DRO unit is investigated. The unit can deliver 10 watts of pulse power for a pulse duration of one microsecond or less
Keywords :
dielectric resonators; microwave oscillators; military equipment; radar equipment; solid-state microwave circuits; transponders; -50 to 50 C; 2.5 W; 9 GHz; FET amplifier; GaAs; X-band; cavity modes; continuous wave; dielectric resonator oscillator; efficiency; feedback loop oscillator configuration; frequency stability; high power amplifier; military systems; pulse power capability; radar transponder; single-sideband phase noise levels; Dielectrics; FETs; Frequency; Gallium arsenide; High power amplifiers; Oscillators; Power amplifiers; Power generation; Pulse amplifiers; Temperature;
Conference_Titel :
Frequency Control Symposium, 1992. 46th., Proceedings of the 1992 IEEE
Conference_Location :
Hershey, PA
Print_ISBN :
0-7803-0476-4
DOI :
10.1109/FREQ.1992.269987
