Bidirectional constant impedance low pass/high pass filter circu

Details Bidirectional constant impedance low pass/high pass filter circu Bidirectional constant impedance low pass/high pass filter circu

1975-11-24

1977-01-11

Smith, Alfred E.

Wave transmission lines and networks

Plural channel systems

With balanced circuits

333 32, 333 70R, 333 77, H03H 704, H03H 738, H03H 746

Patent

active

040030059

ABSTRACT:
A bidirectional filter circuit having an input and an output and substantly constant input and output impedance characteristics over the desired frequency range. A low-pass filter network is connected between filter input and output and has identical low-pass filter half sections cascaded back-to-back with a symmetrical all-pass network interposed therebetween, the all-pass network providing isolation between the low-pass filter half sections and the desired terminating impedance therefor. First and second identical compensating networks are respectively connected to the filter input and output and have reciprocal characteristic functions with respect to the low-pass filter half sections to compensate for impedance changes in the low-pass filter half sections over the desired frequency range without affecting amplitude characteristics thereof. A high-pass filter network is connected between filter input and output and has identical high-pass filter half sections cascaded back-to-back with a symmetrical all-pass network interposed therebetween, the all-pass network providing isolation between the high-pass filter half sections and the desired terminating impedance therefor. Third and fourth identical compensating networks are respectively connected to the filter input and output and have reciprocal characteristic functions with respect to the high-pass filter half sections to compensate for impedance changes in the high-pass filter half sections over the desired frequency range without affecting amplitude characteristics thereof.

REFERENCES:
patent: 1615252 (1927-01-01), Zobel
patent: 3449696 (1969-06-01), Routh
patent: 3737813 (1973-06-01), Buecherl
patent: 3794936 (1974-02-01), Poschenrieder et al.
patent: 3922623 (1975-11-01), Bucherl

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