Selectable bandstop/bandpass filter with switches selecting the

Details Selectable bandstop/bandpass filter with switches selecting the Selectable bandstop/bandpass filter with switches selecting the

1994-02-28

1996-07-30

Lee, Benny

Wave transmission lines and networks

Coupling networks

Wave filters including long line elements

333134, H01P 1202

Patent

active

055415601

ABSTRACT:
A dielectric filter (1) comprises a body of dielectric material, having two bores (3) running therethrough acting as resonators. The sides of the body are covered in a metallic coating apart from an upper surface (2) and one side surface (4). Electrode patterns are provided on the uncoated side surface to provide inductive and capacitive coupling between the resonators. By providing switches 8, the ratio of inductive to capacitive coupling can be changed thus allowing the filter to act as a bandstop or bandpass filter depending upon whether the switches are open or closed.

REFERENCES:
patent: 4467296 (1984-08-01), Cohen et al.
patent: 4714906 (1987-12-01), D'Albaret et al.
patent: 4742562 (1988-05-01), Kommrusch
patent: 4980660 (1990-12-01), Nakamura et al.
patent: 5021757 (1991-06-01), Kobayashi et al.
patent: 5055808 (1991-10-01), Walker et al.
patent: 5065121 (1991-11-01), Ghadaksaz
patent: 5103197 (1992-04-01), Turunen et al.
patent: 5239279 (1993-08-01), Turunen et al.
J. L. Lacombe, "Switchable Band-Stop Filter For M.I.C.", 14th European Microwave Conference, Sep. 101-13, 1984, cover page and pp. 376-381.
Patent Abstracts of Japan, vol. 9,No. 185 (E-332)(1908), Jul. 31, 1985 & JP-A-60 055 702 (Mitsubishi Denki K.K.), Apr. 1, 1985, 1 page.

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