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Doppler radar module circuit for object motion detection - has aerial coupled to control circuit for circuit of single active switching element for oscillator and receiver
Doppler radar module circuit for object motion detection - has aerial coupled to control circuit for circuit of single active switching element for oscillator and receiver
The circuit has an oscillator generating a frequency in a microwave range, a resonator (2) for the frequency stabilising, and an aerial coupled to the oscillator, simultaneously suitable for reflected signal reception for a receiver. By mixing with the oscillator frequency and following low pass filtering, a movement signal can be tapped at the aerial. The oscillator and receiver contain a single, common, active switch (1), whose load path contains a voltage )source for the current supply. The aerial (4) is coupled to the control circuit of the active switch. Pref. the latter has a control terminal and two other terminals for specified connections. ADVANTAGE - Improved efficiency w.r.t. reflected signal without increased cost.
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