Multiple-section bandpass filter for broadcast communications

Details Multiple-section bandpass filter for broadcast communications Multiple-section bandpass filter for broadcast communications

2006-11-28

2006-11-28

Trinh, Sonny (Department: 2618)

Telecommunications

Receiver or analog modulated signal frequency converter

With particular receiver circuit

C455S334000, C333S219000

Reexamination Certificate

active

07142837

ABSTRACT:
A multiple-section bandpass filter for broadcast communications includes adjacent waveguide segments with a perpendicular connecting segment between them to form a U-shaped signal path. The waveguide cavities of the segments may be extruded and rectangular in cross section, and have a groundplane spacing that allows signal propagation between filter sections by evanescent coupling. Resonators in each of the adjacent segments have a separation that establishes the coupling bandwidths without the need for passive decoupling structures. A cross coupling conductor between the adjacent segments provides a capacitive or inductive coupling between them. A decoupling structure may be located in the connecting segment.

REFERENCES:
patent: 4630009 (1986-12-01), Tang
patent: 5867077 (1999-02-01), Lundquist
patent: 5936490 (1999-08-01), Hershtig
patent: 6232852 (2001-05-01), Small et al.
patent: 6236292 (2001-05-01), Hershtig
patent: 6300850 (2001-10-01), Kaegebein
patent: 6342825 (2002-01-01), Hershtig

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