Coplanar line filter and duplexer

Details Coplanar line filter and duplexer Coplanar line filter and duplexer

1999-02-01

2000-12-26

Pascal, Robert

Wave transmission lines and networks

Coupling networks

Wave filters including long line elements

333219, 333134, H01P 120, H01P 700, H01P 512

Patent

active

061666122

ABSTRACT:
The present invention provides a coplanar line filter or a duplexer, comprising: a dielectric substrate; a plurality of .lambda./4 coplanar resonators provided on said dielectric substrate, said plurality of .lambda./4 coplanar resonators comprising; a first center conductor having electrical length corresponding to a quarter wavelength; and a ground conductor provided with a gap from said first center conductor; a capacitive coupling portion comprising ai gap provided between said first center conductors of a pair of said .lambda./4 coplanar resonators; and a inductive coupling portion, comprising a guide conductor which electrically connects said first center conductor and ground, provided at a joint portion of a pair of said .lambda./4 coplanar resonators; said plurality of .lambda./4 coplanar resonators being connected in series with said capacitive coupling portion and said inductive coupling portion provided alternately. By the above structure and arrangement, a small-scale coplanar line filter or duplexer of simple design is obtained.

REFERENCES:
patent: 4233579 (1980-11-01), Carlson et al.
patent: 5105173 (1992-04-01), Itou
patent: 5376908 (1994-12-01), Kawaguchi et al.
Kibuuka G. et al.: "Coplanar Lumped Element and Their Applications in Filters on Ceramic and Gallium Arsenide Substrates" Proceedings of the European Microwave Conference, London, Sep. 4-7, 1989, no. Conf. 19, Sep. 4, 1989, pp. 656-661.
M. Houdart: "Coplanar Lines: Application to Broadband Microwave Integrated Circuits" 6th European Microwave Conference-Proceedings, Sep. 14-17, 1976, pp. 49-53.
Sharma A K et al.: "Experimental Models of 1, 4 Series and Shunt Elements in Coplanar MMICS" International Microwave Symposium Digest (MTT-S), Albuquerque, Jun. 1-5, 1992, vol. 3, Jun. 1, 1992, pp. 1349-1352.
Swanson D G et al.: An HTS End-Coupled CPW Filter at 35 GHZ IEEE MTT-S International Microwave Symposium Digest, San Diego, May 23-27, 1994, vol. 1, May 23, 1994, pp. 199-202.
European Search Report dated Apr. 27, 1999.

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