Series coupled filters where the first filter is a dielectric resonator filter with cross-coupling
First Claim
1. A dielectric resonator filter having an input port which receives an electromagnetic signal and an output port at which is provided a filtered electromagnetic signal, the filter operating in a magnetic dipole mode and comprising:
- a multi-cavity housing having a plurality of vertical walls disposed at least partially between a base of the dielectric resonator filter and a cover of the dielectric resonator filter, defining a plurality of sequential dielectric resonator cavities that are sequentially oriented in first and second side-by-side rows;
a plurality of cylindrically shaped dielectric resonators, each cylindrically shaped dielectric resonator respectively disposed in one of the plurality of sequential dielectric resonator cavities;
at least one coupling device disposed in a first wall of each of the plurality of sequential dielectric resonator cavities, for coupling the electromagnetic signal between the respective resonators of the sequential dielectric resonator cavities;
a cross-coupling device disposed through a second wall of a first resonator cavity and a second resonator cavity of the plurality of sequential dielectric resonator cavities, wherein the first resonator cavity and the second resonator cavity are non-sequential, the cross-coupling device providing cross coupling of the electromagnetic field between the respective dielectric resonators of the first and second resonator cavities; and
wherein each of the cylindrically shaped dielectric resonators comprises a ZrSnTiO base material which is doped with a first dopant Ta in a range between 50 and 1,000 parts per million and a second dopant Sb in a range between 50 and 1,000 parts per million.
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Accused Products
Abstract
A dielectric resonator filter operating in a magnetic dipole mode includes a plurality of dielectric resonators disposed in a plurality of dielectric resonator cavities. A plurality of coupling mechanism provide an in-line coupling factor between respective resonators of electrically adjacent dielectric resonator cavities. At least one cross-coupling device provides cross-coupling between respective resonators of non-adjacent dielectric resonator cavities. A magnitude and sign of the in-line coupling factors and the cross-coupling factor, provide a dielectric resonator filter, for which a desired amplitude and phase response can be provided.
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Citations
33 Claims
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1. A dielectric resonator filter having an input port which receives an electromagnetic signal and an output port at which is provided a filtered electromagnetic signal, the filter operating in a magnetic dipole mode and comprising:
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a multi-cavity housing having a plurality of vertical walls disposed at least partially between a base of the dielectric resonator filter and a cover of the dielectric resonator filter, defining a plurality of sequential dielectric resonator cavities that are sequentially oriented in first and second side-by-side rows; a plurality of cylindrically shaped dielectric resonators, each cylindrically shaped dielectric resonator respectively disposed in one of the plurality of sequential dielectric resonator cavities; at least one coupling device disposed in a first wall of each of the plurality of sequential dielectric resonator cavities, for coupling the electromagnetic signal between the respective resonators of the sequential dielectric resonator cavities; a cross-coupling device disposed through a second wall of a first resonator cavity and a second resonator cavity of the plurality of sequential dielectric resonator cavities, wherein the first resonator cavity and the second resonator cavity are non-sequential, the cross-coupling device providing cross coupling of the electromagnetic field between the respective dielectric resonators of the first and second resonator cavities; and wherein each of the cylindrically shaped dielectric resonators comprises a ZrSnTiO base material which is doped with a first dopant Ta in a range between 50 and 1,000 parts per million and a second dopant Sb in a range between 50 and 1,000 parts per million. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23)
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24. A dielectric resonator filter having an input port which receives an electromagnetic signal and an output port at which is provided a filtered electromagnetic signal, the filter operating in a magnetic dipole mode and comprising:
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a multi-cavity housing having a plurality of vertical walls disposed at least partially between a base of the dielectric resonator filter and a cover of the dielectric resonator filter, defining a plurality of sequential dielectric resonator cavities that are sequentially oriented in first and second side-by-side rows; a plurality of cylindrically shaped dielectric resonators, each cylindrically shaped dielectric resonator respectively disposed in one of the plurality of sequential dielectric resonator cavities; means for coupling the electromagnetic signal between the respective resonators of the sequential dielectric resonator cavities so as to provide respective inter-resonator coupling factors; means for providing cross-coupling of the electromagnetic signal between respective dielectric resonators of a first dielectric resonator cavity and a second non-sequential dielectric resonator cavity of the plurality of sequential dielectric resonator cavities; and wherein in each of the cylindrically shaped dielectric resonators comprises a ZrSnTiO base material which is doped with a first dopant Ta in a range between 50 and 1,000 parts per million and a second dopant Sb in a range between 50 and 1,000 parts per million. - View Dependent Claims (25, 26, 27, 28, 29)
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30. A method of providing a band pass filter which will meet in-band and out-of-band electrical performance requirements for insertion loss, return loss and attenuation comprising the steps of:
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providing a first band pass filter having a first pass-band width including a first center frequency, a first out-of-band suppression factor, and a first in-band insertion loss and return loss which meet the in-band electrical performance requirements of the bandpass filter; and providing a second band pass filter, disposed in series with the first band pass filter, having a second center frequency that is substantially the same as the first center frequency and a second pass-band width that is broader than the first pass-band width of the first bandpass filter so that the first pass-band of the first bandpass filter is included within the second pass band of second bandpass filter, and a second out-of-band suppression factor sufficient, in combination with the first out-of-band suppression factor of the first bandpass filter, to suppress any spurious signals from the first band pass filter and to comply with the out-of-band attenuation electrical performance requirements of the bandpass filter; wherein the first band pass filter is a dielectric resonator filter, comprising; a multi-cavity housing having a plurality of vertical walls disposed at least partially between a base of the dielectric resonator filter and a cover of the dielectric resonator filter, defining a plurality of sequential dielectric resonator cavities that are sequentially oriented in first and second side-by-side rows; a plurality of cylindrically shaped dielectric resonators, each cylindrically shaped dielectric resonator respectively disposed in one of the plurality of sequential dielectric resonator cavities; at least one coupling device, disposed in a first wall of each of the plurality of sequential dielectric resonator cavities, for coupling an electromagnetic field between the respective resonators of the sequential dielectric resonator cavities; and a cross-coupling device, disposed through a second wall of a first resonator cavity and a second non-sequential dielectric resonator cavity of the plurality of sequential dielectric resonator cavities, wherein the cross-coupling device providing cross-coupling of the electromagnetic field between the respective dielectric resonators of the first and second dielectric resonator cavities. - View Dependent Claims (31, 32, 33)
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Specification