Resonating structure providing notch and bandpass filtering
First Claim
1. A resonator filter having an enclosed conductive housing, the filter comprising:
- first and second resonator cavities in the conductive housing;
a wall separating the first resonator cavity from the second resonator cavity, and having an energy-coupling opening extending through the wall and linking the first and second resonator cavities;
a resonator within the first resonator cavity and having a surface facing one side of the housing;
a conductive member having a surface arranged opposite the surface of the resonator and spaced therefrom by a certain distance, wherein the resonator and the conductive member in the first resonator cavity are arranged to provide a notch filter;
a coupler having a relatively wide and flat portion arranged between the resonator and the conductive member and having a relatively elongated section constructed and arranged to extend into and to couple energy through the opening from the first resonator cavity to the second resonator cavity; and
a coaxial resonator center located within the second resonator cavity and arranged to provide a bandpass filter.
18 Assignments
0 Petitions
Accused Products
Abstract
A combination notch/bandpass filter uses first and second adjacently-located cavities in the conductive housing to respectively provide a tunable, first-stage notch filter and a second-stage bandpass filter. An opening in a wall provides a passage for energy from the first cavity to the second cavity. In the first cavity, a resonator is located adjacent the opening, along with a notch-filter tuning member having one end arranged opposite the resonator and spaced therefrom by a distance to permit the wide end of a coupler to be suspended therebetween. An elongated portion of the coupler carries filtered energy from the first cavity to the second cavity.
50 Citations
15 Claims
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1. A resonator filter having an enclosed conductive housing, the filter comprising:
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first and second resonator cavities in the conductive housing; a wall separating the first resonator cavity from the second resonator cavity, and having an energy-coupling opening extending through the wall and linking the first and second resonator cavities; a resonator within the first resonator cavity and having a surface facing one side of the housing; a conductive member having a surface arranged opposite the surface of the resonator and spaced therefrom by a certain distance, wherein the resonator and the conductive member in the first resonator cavity are arranged to provide a notch filter; a coupler having a relatively wide and flat portion arranged between the resonator and the conductive member and having a relatively elongated section constructed and arranged to extend into and to couple energy through the opening from the first resonator cavity to the second resonator cavity; and a coaxial resonator center located within the second resonator cavity and arranged to provide a bandpass filter. - View Dependent Claims (2, 3, 4, 5)
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6. A combination notch/bandpass filter having an enclosed conductive housing, the combination notch/bandpass filter comprising:
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first and second adjacently-located cavities in the conductive housing; a wall separating the first cavity from the second cavity, and having an energy-coupling aperture extending through the wall and providing a passage for energy from the first cavity to the second cavity; a resonator within the first cavity, the resonator having a surface facing one side of the housing and located adjacent the aperture, the resonator supported by a post extending from an opposite side of the housing; a coaxial resonator center located within the second resonator cavity and arranged to provide a bandpass filter; a notch-filter tuning member having one end arranged opposite the surface of the resonator and spaced therefrom by a tunably adjustable distance; and a coupler having a relatively wide end suspended between the resonator and the conductive member and having opposing surfaces respectively facing the resonator and the conductive member and having a relatively elongated portion constructed and arranged to extend through the aperture from the first resonator cavity to the second resonator cavity. - View Dependent Claims (7, 9, 10)
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8. A radio comprising:
a combination notch/bandpass filter having first and second adjacently-located cavities in the conductive housing, a wall separating the first cavity from the second cavity, and having an energy-coupling aperture extending through the wall and providing a passage for energy from the first cavity to the second cavity, a resonator within the first cavity, the resonator having a surface facing one side of the housing and located adjacent the aperture, the resonator supported by a post extending from an opposite side of the housing, a coaxial resonator center located within the second resonator cavity and arranged to provide a bandpass filter, a notch-filter tuning member having one end arranged opposite the surface of the resonator and spaced therefrom by a tunably adjustable distance, and a coupler having a relatively wide end suspended between the resonator and the conductive member and having opposing surfaces respectively facing the resonator and the conductive member and having a relatively elongated portion constructed and arranged to extend through the aperture from the first resonator cavity to the second resonator cavity; and a power amplifier coupled to the combination notch/bandpass filter.
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11. A resonator filter having an enclosed conductive housing, the filter comprising:
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first and second cavities in the conductive housing; a wall separating the first cavity from the second cavity, and having coupling means for conducting energy between the first and second cavities; a resonator within the first cavity and having a surface facing one side of the housing; a conductive member having a surface arranged opposite the surface of the resonator and spaced therefrom by a certain distance, wherein the resonator and the conductive member in the first cavity are arranged to provide a notch filter; elongated energy-coupling means arranged between the resonator and the conductive member without contacting the resonator or the conductive member, the elongated energy-coupling means constructed and arranged in conjunction with the coupling means to present filtered energy from the first cavity to the second cavity; and means in the second cavity arranged, in conjunction with the second cavity, to provide a bandpass filter for energy passing therethrough in a direction from the first cavity. - View Dependent Claims (12, 13)
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14. A method for notch-filtering and bandpass-filtering of energy using a resonator filter having an enclosed conductive housing, the method comprising:
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providing first and second cavities in the conductive housing with a wall separating the first cavity from the second cavity and with an opening in the wall for conducting energy between the first and second cavities; arranging a resonator member within the first cavity with a surface of the resonator member facing a side of the housing; spacing a conductive member opposite the surface of the resonator by a certain distance, wherein the resonator member and the conductive member in the first cavity are arranged to form a notch filter; providing an intracavity energy coupler having a relatively wide end and a relatively elongated portion; suspending the relatively wide end of the coupler between the resonator and the conductive member and arranging the relatively elongated portion to present filtered energy from the first cavity to the second cavity; and arranging a metal post in the second cavity to provide a coaxial resonator bandpass filter for energy passing therethrough in a direction from the first cavity. - View Dependent Claims (15)
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Specification