MULTIPLE FREQUENCY SIGNAL AMPLITUDE AND PHASE MODULATOR Russian patent published in 2009 - IPC H03C3/00 

FIELD: physics.

SUBSTANCE: modulator includes multiple frequency signal source, uncontrollable section designed as reactive four-terminal element, low-frequency driving signal source, controlled section designed as three-pole controlled element. Reactive four-terminal element represents symmetrical bridge connecting circuit of four reactive two-terminal elements of reactances X_1k, X_2k, X_3k, X_4k, made of series loop L_n, C_n, parallel connected to inductance L_0n. Herewith aforesaid reactances of two-terminal elements at each of three preset frequencies ω_k are chosen through mathematical expressions.

EFFECT: provided amplitude and phase manipulation and line signal amplitude amplifying at preset number of fixed frequencies.