INPUT CIRCUIT OF SUPERHETERODYNE MICROWAVE RECEIVER Russian patent published in 1997 - IPC

FIELD: radio engineering. SUBSTANCE: device has printed circuit antenna which is designed as phased-antenna array from spiral printed circuit conducts and serial co-plane strip adder which is located on metal-coated dielectric substrate. In addition device has diode mixer, heterodyne and printed circuit filter of intermediate frequency. Device design includes gaps in strip conductor of co-plane adder between connection points of inner ends of spiral printed circuit conducts of emitters. Capacitors are inserted into these gaps. Such structure for intermediate frequency operates like narrow-band filter for intermediate frequency. Device output is connected to second end of strip conductor of co-plane adder of phased-antenna array. First end of strip conductor is connected to mixer. EFFECT: simplified design, decreased size of input circuit which receives round polarization emission and converts it to intermediate frequency. 2 dwg