Wave transmission lines and networks – Coupling networks – Wave filters including long line elements
Reexamination Certificate
2008-04-08
2008-04-08
Lee, Benny (Department: 2817)
Wave transmission lines and networks
Coupling networks
Wave filters including long line elements
C333S212000, C333S248000
Reexamination Certificate
active
07355496
ABSTRACT:
The present invention relates to a FINLINE type microwave band-pass filter comprising a waveguide provided with an insulating substrate placed in an E plane of the guide and comprising on at least one of the surfaces, conductive inserts electrically connected to the internal surfaces of the guide which support the substrate and which determine by their dimensions and their positioning on the substrate a Chebyshev type filter response curve. The filter includes at least one cavity in perpendicular short circuit to the substrate, the positioning and the dimensions of the cavity determining a transmission zero on the filter response curve for attenuating the frequencies situated around this zero. Such a filter is used in particular in transmission terminals operating in the Ka band.
REFERENCES:
patent: 5262739 (1993-11-01), Dalman
patent: 7292123 (2007-11-01), Tong et al.
Arndt, F., et al. : “The rigorous CAD of aperture-coupled T-junction bandstop-fillers, E-plane circuit elliptic-function filters, and diplexers”, Microwave Symposium Digest, 1991. IEEE MTT-S International Boston, MA, USA Jun. 10-14, 1991, New York, NY, USA IEE US , Jun. 10, 1991.
Bornemann, J. : “Selectivity-improved E-plane filter for millimetre-wave applications”. Electronics Letters, IEE Stevenage, GB, vol. 27, No. 21. Oct. 10, 1991, pp. 1891-1893.
Ofli E et al Institute of Electrical and Electronics Engineers: “Analysis and design of mass-producible cross-coupled, folded E-plane filters” 2001 IEEE MTT-S International Microwave Symposium Digest (IMS 2001) Phoenix, AZ May 20-25, 2001, IEEE MTT-S International Microwave Sysmposium, New York, NY: IEE, US vol. 3 of 3, May 20, 2001, pp. 1775-1778.
Young, d. et al.: “Intergrated E-plane filters with finite frequency transmission zeros”, 24th. European Microwave Conference Proceedings, Nexus Business Communications, GB, vol. 1, Conf. 24, Sep. 5, 1994, pp. 460-465.
Baron François
Guguen Charline
Le Naour Jean-Yves
Lo Hine Tong Dominique
Duffy Vincent E.
Glenn Kimberly E
Laks Joseph J.
Lee Benny
Pugel Michael A.
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