Ferromagnetic power limiter

Claim 1

IN COMBINATION, A POWER LIMITER HAVING NON-LINEAR FERROMAGNETIC CHARACTERISTICS, COMPRISING FIRST AND SECOND RECTANGULAR WAVEGUIDES HAVING OPPOSED BROAD AND NARROW WALLS AND BEING JOINED TOGETHER IN A T CONFIGURATION, SAID FIRST WAVEGUIDE HAVING PORTS THROUGH WHICH A RADIO FREQUENCY SIGNAL PROPAGATES; MEANS FOR ELECTTOMAGENETICALLY COUPLING SAID SIGNAL FROM SAID FIRST WAVEGUIDE TO SAID SECOND WAVEGUIDE, SAID SECOND WAVEGUIDE HAVING AN END WALL REMOTE FROM SAID COUPLING MEANS, SAID END WALL BEING MOVABLE LONGITUDINALLY TO SAID SECOND WAVEGUIDE WHEREBY TO ADJUST THE EFFECTIVE ELECTRICAL LENGTH OF SAID SEDOND GUIDE TO A VALUE LESS THAN $G/2 WHERE $G IS THE WAVEGUIDE WAVELENGTH OF SAID SIGNAL; MEANS FOR AUTOMATICALLY MOVING SAID END WALL RELATIVE TO SAID CAVITY COMPRISNG A POWER DIVIDER, A FREQUENCY DISCRIMINATOR, AND AN ELECTROMECHANICAL TRANSDUCER, SAID POWER DIVIDER HAVING INPUT AND OUTPUT TERMINALS, SAID INPUT TERMINAL BEING CONNECTED TO SAID FIRST WAVEGUIDE FOR SAMPLING SAID SIGNAL IN SAID FIRST WAVEGUIDE, SAID FREQUENCY DESCRIMINATOR BEING CONNECTED TO SAID OUTPUT TERMINAL OF THE POWER DIVIDER AND PRODUCING AN OUTPUT VOLTAGE PROPORTIONAL TO CHANGES IN THE SIGNAL FREQUENCY, SAID TRANSDUCER BEING ELECTRICALLY CONNECTED TO THE OUTPUT OF SAID DISCRIMINATOR AND MECHANICALLY CONNECTED TO SAID END WALL AND BEING RESPONSIVE TO SAID VOLTAGE WHEREBY TO MOVE SAID END WALL LONGITUDINALLY OF SAID SECOND WAVEGUIDE, THE SPACING BETWEEN SAID END WALL AND SAID COUPLING MEANS OF SAID SECOND GUIDE BEING VARIED TO A VALUE WHICH IS LESS THAN $G/2 FOR THE CHANGED SIGNAL; AN YTTRIUM IRON GARNET SPHERE HAVING A LINEWIDTH THAT IS SMALL COMPARED WITH THE WAVELENGTH OF SAID SIGNAL AND BEING LOCATED ON SAID END WALL; AND MAGNET MEANS FOR PRODUCING A UNIDIRECTIONAL MAGNETIC FIELD OF CONSTANT STRENGTH ACROSS SAID SPHERE TO FERROMAGNETIC RESONANCE FIELD MAGNETIZING SAID SPHERE TO FERROMAGNETIC RESONANCE WHEREIN A PLURALITY OF MAGNETIC MOMENTS ARE FORMED IN SAID SPHERE, SAID SPHERE BEING RESPONSIVE TO A PREDETERMINED RADIO FREQUENCY MAGNETIC FIELD FOR CHANGING SAID ELECTRICAL LENGTH IS SAID SECOND WAVEGUIDE TO A VALUE EQUAL TO $G/2, THE RELATIONSHIP OF SAID PREDETERMINED MAGNETIC FIELD AND SAID SPHERE BEING