DEMODULATOR OF AMPLITUDE-MODULATED, FREQUENCYMODULATED, AND PHASE-MODULATED SIGNALS Russian patent published in 2003 - IPC

FIELD: radio engineering; radio receivers and measuring instruments. SUBSTANCE: demodulator has two-wire short-circuited line 1 whose input is supplied with amplitude-, frequency-, and phase-modulated radio signal. Conductor 2 of same length is inserted between two-wire shortcircuited line conductors in parallel to them, its ends being connected to input of low-frequency filter 3. Two-wire short-circuited line 1 and conductor 2 placed between line conductors are jointly twisted into spiral. Chosen length of line 1 and of conductor 2 placed between line conductors equals minimum one tenth of modulated signal wavelength. EFFECT: reduced size of demodulator. 2 cl, 1 dwg