Wave transmission lines and networks – Coupling networks – Wave filters including long line elements
Reexamination Certificate
2005-04-12
2005-04-12
Ham, Seungsook (Department: 2817)
Wave transmission lines and networks
Coupling networks
Wave filters including long line elements
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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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.
Boutheiller Nicolas
Jarry Pierre
Kerherve Eric
Latouche Yannick
Pham Jean-Marie
Alcatel
Ham Seungsook
Sughrue & Mion, PLLC
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