| 摘要 |
A microwave sensor is described, with a self-mixing oscillator (1), with a transmitting and receiving antenna (2), with an impedance (3) which is connected between the current or voltage supply (4) and the oscillator (2), and with an evaluation circuit (5), the self-mixing oscillator (2) producing both the transmitted signal and also mixing the transmitted signal with the received signal and the low-frequency mixed (Doppler signal) being tapped on the impedance (3) and supplied to the evaluation circuit (5).The microwave sensor has only lower power consumption, and the microwave sensor can also be economically produced in that the self-mixing oscillator (2) is made as a push-pull oscillator with two transistors (6, 7).
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