Phase shifter networks

Claim 1

A PHASE SHIFTER FOR PRODUCING A SUBSTANTIALLY CONSTANT 90* PHASE SHIFT AND SUBSTANTIALLY CONSTANT ATTENUATION OF AN INPUT VOLTAGE THROUGHOUT A FREQUENCY BAND, COMPRISING A PHASE LEAD NETWORK AND A PHASE LAG NETWORK, SAID NETWORKS HAVING RESPECTIVE CHARACTERISTIC BREAK FREQUENCIES DISPOSED, SYMMETRICALLY ABOVE AND BELOW THE CENTER FREQUENCY OF SAID BAND AND DESIGNED TO PRODUCE SUBSTANTIALLY EQUAL ATTENUATIONS AT THE CENTER FREQUENCY AND RESPECTIVE PHASE SHIFTS THAT ARE OPPOSITE IN SENSE BUT SUBSTANTIALLY EQUAL IN MAGNITUDE AT SAID CENTER FREQUENCY, SAID NETWORKS HAVING A COMMON REFERENCE AND EACH HAVING AN INPUT TERMINAL AND AN OUTPUT TERMINAL, A PAIR OF INPUT CIRCUIT MEANS CONNECTED TO SAID INPUT TERMINALS FOR APPLYING SAID INPUT VOLTAGE THERETO, AND A PAIR OF OUTPUT CIRCUIT MEANS CONNECTED TO SAID OUTPUT TERMINALS FOR COMBINING THE OUTPUTS OF SAID NETWORKS TO PRODUCE A RESULTANT OUTPUT VOLTAGE, ONE OF SAID INPUT AND OUTPUT CIRCUIT MEANS COMPRISING CONNECTIONS TO ONE OF SAID INPUT AND ONE OF SAID OUTPUT NETWORK TERMINALS IN OPPOSITE POLARITIES WITH RESPECT TO A REFERENCE POTENTIAL COMMON TO THE INPUT AND OUTPUT CIRCUITS AND THE OTHER COMPRISING CONNECTIONS TO THE OTHER OF SAID INPUT AND THE OTHER OF SAID OUTPUT NETWORK TERMINALS IN LIKE POLARLITY WITH RESPECT TO THE REFERENCE.