Waveguide quardruple mode microwave filter having zero...

Wave transmission lines and networks – Coupling networks – Wave filters including long line elements

Reexamination Certificate

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C333S212000

Reexamination Certificate

active

06879226

ABSTRACT:
The invention relates to a quadruple mode microwave filter having coupled cavities with a plurality of transmission zeros, said filter comprising at least one rectangular parallelepiped-shaped quadruple mode cavity, at least two rectangular irises, and two input/output waveguides. Tuning and coupling of the filter are obtained exclusively by the dimensions and mutual disposition of the at least one resonant cavity and the irises, without any screw or other tuning mechanism. All the faces of the cavities and the irises are either parallel or perpendicular to each other. In a preferred embodiment the irises are offcentered along the two transverse axes. According to one advantageous feature, the input mode and the output mode are the same, preferably the TE 10 fundamental mode.

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patent: 6211752 (2001-04-01), Gendraud et al.
patent: 6538535 (2003-03-01), Guglielmi et al.
patent: 2 675 952 (1992-10-01), None
R. Bonetti et al, “A Hexa-Mode Bandpass Filter”, 1990 IEEE International Microwave Symposium—Digest, May 8-10, 1990, pp. 207-210, XP010004643.
G. Lastoria et al, “Cad of Triple-Mode Cavities in Rectangular Waveguide”, IEEE Microwave and Guided Wave Letters, IEEE Inc., NY, US, vol. 8, No. 10, Oct. 1, 1998, pp. 339-341, XP000788271.
N. Boutheiller et al, “A Two Zero Fourth Order Microwave Waveguide Filter Using a Simple Rectangular Quadruple-Mode Cavity”, 2002 IEEE MTT-S International Microwave Symposium Digest. (IMS 2002), Seattle, WA, Jun. 2-7, 200, IEEE, vol. 3 of 3, Jun. 2, 2002, pp. 1777-1780, XP001113948.

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