Adjustable polarization waveguide for radar

Claim 1

IN RADAR APPARATUS HAVING A TRANSMITTER AND A RADIATOR, A WAVEGUIDE SYSTEM CONNECTING SAID TRANSMITTER TO SAID RADIATOR COMPRISES A LENGTH OF SQUARE WAVEGUIDE RIGIDLY COUPLED TO SAID RADIATOR, A VANE IN SAID LENGTH OF SQUARE WAVEGUIDE PARALLEL TO ONE OF THE SIDES OF THE GUIDE AND MOVABLE TRANSVERSELY THERETO SO AS TO FORM A PHASE SHIFTER FOR VARYING THE PHASE OF THE SIGNAL COMPONENT IN SAID SQUARE WAVEGUIDE POLARIZED PARALLEL TO ONE SIDE OF THE GUIDE WITH RESPECT TO THE PHASE OF A SIGNAL COMPONENT POLARIZED TRANSVERSELY THERETO, AND A FEED SYSTEM COUPLING SAID TRANSMITTER TO SAID LENGTH OF SQUARE WAVEGUIDE, WHICH FEED SYSTEM INCLUDES FIRST AND SECOND ROTATABLE COUPLERS, A LENGTH OF WAVEGUIDE BETWEEN THE COUPLERS WHEREBY SAID LENGTH OF WAVEGUIDE BETWEEN THE COUPLERS IS ROTATABLE WITH RESPECT TO THE SQUARE WAVEGUIDE, THE FIRST ROTATABLE COUPLER BEING ARRANGED SO THAT PLANE POLARIZED SIGNALS ARE FED INTO THE ROTATABLE WAVEGUIDE WITH A PLANE OF POLARIZATION WHICH IS ROTATABLE WITH THAT GUIDE AND SAID SECOND ROTATABLE COUPLER BEING ARRANGED SO THAT SIGNALS ARE FED OUT OF THE ROTATABLE WAVEGUIDE THROUGH THE SECOND COUPLER WITHOUT CHANGE OF POLARIZATION.