Frequency channel branching filter

Abstract

Abstract PURPOSE:To obtain a frequency channel branching filter with excellent characteristic by inserting a resistor in series with a connection section between a signal transmission line and each band pass filter so as to compensate in the impedance reduction at the outside of a filter pass band. CONSTITUTION:Coaxial lines 16A, 16A' are signal transmission lines subject to termination matching to prevent a reflecting wave. Band pass filters C1-Cn corresponding to each pass channel are connected to a line 16A and ground 16A' via resistors B1-Bn. The resistors B1-Bn are selected to compensate the impedance of the band pass filters C1-Cn at the input impedance decrease region at the outside of the pass band of the filters respectively to prevent the characteristic deterioration near the crossover frequency of a parallel branching filter thereby obtaining a frequency channel branching filter with excellent characteristic.

Inventors

• 👤 Shinichi Ishikawa
• 👤 Junichi Ikeda
• 👤 Yoshizo Shibano

Bibliographic Details