Filter bank

Details Filter bank Filter bank

1988-07-01

1990-09-04

Laroche, Eugene R.

Wave transmission lines and networks

Plural channel systems

Having branched circuits

333193, 310313R, H03H 746, H03H 976

Patent

active

049547933

ABSTRACT:
A filter bank constituted in such a manner that an interdigital transducer on the input side of a plurality of each of surface acoustic wave filters having different pass bands is used as a shunt element and the shunt element is connected to a series element composed of reactance elements to form a ladder-type circuit, and a circuit composed of an inductor and a capacitor connected in parallel with each other is used as one part of the series element to form a pole near the cut-off frequency, to increase an amount of attenuation of a T-type circuit near the cut-off frequency, and to largely reduce transmitted electric power of spurious components even in a surface acoustic wave filter in a section near a signal source.

REFERENCES:
patent: 4295108 (1981-10-01), Ieki
patent: 4689586 (1987-08-01), Yamada et al.
Denis C. Webb et al., "A Saw Contiguous Filter Bank Derived From a Constant-K Ladder", 1975 Ultrasonics Symposium Proceedings, IEEE Cat. #75, CHO 994-4SU, pp. 311-314.
Denis C. Webb et al., "Properties of a Constant-k Ladder SAW Contiguous Filter Bank", IEEE Transactions on Sonics and Ultrasonics, vol. SU-23, No. 6, Nov. 1976, pp. 386-393.

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