Bandpass filter unit and communication apparatus

Details Bandpass filter unit and communication apparatus Bandpass filter unit and communication apparatus

2005-07-05

2005-07-05

Le, Dinh T. (Department: 2816)

Miscellaneous active electrical nonlinear devices, circuits, and

Specific identifiable device, circuit, or system

Unwanted signal suppression

C327S552000, C333S126000, C333S167000

Reexamination Certificate

active

06914477

ABSTRACT:
A bandpass filter unit includes first and second bandpass filters having substantially the same pass-band characteristics. The first and second bandpass filters are connected in parallel with each other. At least one phase shifter for shifting the phase is connected to at least one of the first and second filters. Accordingly, reflected waves occurring in the first and second bandpass filters cancel out each other at an input terminal pair and an output terminal pair.

REFERENCES:
patent: 3737813 (1973-06-01), Buecherl
patent: 5294898 (1994-03-01), Dworsky et al.
patent: 5721518 (1998-02-01), Hahn
patent: 5815052 (1998-09-01), Nakajima et al.
patent: 6147571 (2000-11-01), Kitazawa et al.
patent: 2002/0130729 (2002-09-01), Larson et al.
“SAW Device Technique Handbook”; edited by the SAW Device Technique 150thCommittee of the Japan Society for the Promotion of Science; Published by Ohm-sha, Ltd.; pp. 205-219.

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