Selectable bandstop/bandpass filter with switches selecting the resonator coupling
First Claim
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1. A dual-mode filter serving the function of one of e bandstop filter and a bandpass filter, the filter comprisingat least two resonators;
- a coupling device to affect coupling between said resonators, said coupling device being adaptable to provide a dominant inductive coupling in a first mode that causes the filter to function as a bandstop filter having a specific stop band and a dominant capacitive coupling in a second mode that causes the filter to function as a bandpass filter having a specific pass band; and
selection means for selecting one of the first and second modes by causing said coupling device to provide one of dominant inductive coupling and capacitive coupling, respectively.
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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.
64 Citations
13 Claims
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1. A dual-mode filter serving the function of one of e bandstop filter and a bandpass filter, the filter comprising
at least two resonators; -
a coupling device to affect coupling between said resonators, said coupling device being adaptable to provide a dominant inductive coupling in a first mode that causes the filter to function as a bandstop filter having a specific stop band and a dominant capacitive coupling in a second mode that causes the filter to function as a bandpass filter having a specific pass band; and selection means for selecting one of the first and second modes by causing said coupling device to provide one of dominant inductive coupling and capacitive coupling, respectively. - View Dependent Claims (2, 3)
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4. A dual-mode filter serving the function of one of a bandstop filter and a bandpass filter, the dual-mode filter comprising:
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at least two resonators formed in a body of dielectric material having an uncoated upper surface and a side surface, and a lower surface and three side surfaces being substantially coated with an electrically conducting layer, and at least two grooves formed on the uncoated side surface, the grooves being coated with an electrically conducting layer so as to form said at least two resonators; coupling means provided on the uncoated side surface and the upper surface of said body of dielectric material to affect coupling between said resonators, said coupling means being adaptable to provide a dominant inductive coupling in a first mode that causes the filter to function as a bandstop filter having a specific stop band and a dominant capacitive coupling in a second mode that causes the filter to function as a bandpass filter having a specific pass band; and selection means for selecting one of the first and second modes by causing said coupling means to provide one of dominant inductive coupling and capacitor coupling, respectively, said coupling means being selectable by the selection means to provide dominant inductive coupling in the first mode and dominant capacitive coupling in the second mode. - View Dependent Claims (5, 6, 7, 8, 9, 10, 11, 12, 13)
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Specification