Bandpass amplifier with transistorized isolation stage

Claim 1

A SOLID STATE BANDPASS AMPLIFIER COMPRISING: (1) A LOW IMPEDANCE INPUT SELECTIVE NETWORK; (2) AN OUTPUT SELECTIVE NETWORK, BOTH OF SAID NETWORKS BEING SELECTIVE OVER THE SAME BAND OF FREQUENCIES; (3) A TRANSISTOR AMPLIFYING STAGE CONNECTED IN A CONFIGURATION HAVING A HIGH INPUT IMPEDANCE, THE OUTPUT OF SAID AMPLIFYING STAGE BEING COUPLED TO SAID OUTPUT NETWORK; (4) A TRANSISTOR ISOLATING STAGE CONNECTED IN THE COMMON COLLECTOR CONFIGURATION AND HAVING ITS INPUT COUPLED TO THE LOW IMPEDANCE NETWORK AND ITS OUTPUT TO THE INPUT OF SAID AMPLIFYING STAGE, SAID ISOLATING STAGE THUS OPERATING BETWEEN A LOW INPUT IMPEDANCE AND A HIGH OUTPUT IMPEDANCE AND ITS INPUT IMPEDANCE BEING SUBSTANTIALLY GREATER THAN THE NOMINAL IMPEDANCE OF SAID INPUT NETWORK SO THAT A SUBSTANTIAL IMPEDANCE MISMATCH EXISTS WHEREBY VARIATIONS IN THE IMPEDANCE OF SAID OUTPUT NETWORK HAVE NEGLIGIBLE EFFECT ON THE EXISTING MISMATCH AND ON SAID INPUT NETWORK, SAID TRANSISTOR ISOLATING STAGE ALSO REDUCING THE IMPEDANCE VARIATION OF THE INPUT NETWORK IN PROPORTION TO THE BETA OF SAID TRANSISTOR WHEREBY IMPEDANCE VARIATIONS OF SAID INPUT NETWORK HAVE NEGLIGIBLE EFFECT ON SAID OUTPUT NETWORK AND PREVENT INTERACTION BETWEEN SAID NETWORKS DUE TO REFLECTED IMPEDANCES.