MODULE OF DOPPLER RADAR Russian patent published in 1998 - IPC

FIELD: radio engineering, devices detecting travel of man and various objects, burglar alarms in various rooms. SUBSTANCE: module is supplemented with first capacitor and first bias resistor with proper couplings. Capacitor allows to isolate strip antenna from bias input to which constant collector bias of transistor of generation element is fed. This gives possibility to connect nonradiating butts of antenna directly to input of zero potential which excludes passage of interference emerging in supply circuits to antenna. Resistor sets emitter current in antenna which enables its base to be connected to input of constant potential. As result transistor functions under mode of "common base" that is characterized by poor dependence on gain factor of transistor, simplifies final tuning of module and leads to reduction of its cost. EFFECT: increased noise immunity and reduced cost of module. 1 cl, 1 dwg