24 GHz Low-Cost Doppler Sensor

24 GHz low-cost Doppler sensor with fundamental-frequency GaAs pseudomorphic HEMT oscillator stabilized by dielectric resonator operating in higher-order mode
P. Heide, R. Schubert, V. Mágori, R. Schwarte, IEEE MTT-S International Microwave Symposium, San Diego, May 1994

Abstract

24 GHz fundamental-frequency microwave oscillators using low-cost packaged HEMTs and a dielectric resonator in a higher-order mode are reported. From the very high quality factor of the resonator-mode, excellent phase noise (-95 dBc/Hz at 100 kHz offset) and a good temperature stability (+9ppm/K) are achieved. The output power is about +10 dBm. By adding a demodulator diode and a patch antenna, a high-performance low-cost Doppler sensor for speed over ground measurements has been built.

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