Filter with integrated loading capacitors
First Claim
Patent Images
1. A filter disposed within a multilayer substrate, the filter comprising:
- a first and second resonator, the first and second resonators respectively having a short circuit end and an open circuit end, the respective short circuit ends of the first and second resonators coupled to a first ground plane;
an input coupled to the first resonator;
an output coupled to the second resonator;
a first loading capacitor coupled to the open circuit end of the first resonator, the first loading capacitor comprising a first capacitor plate and a second capacitor plate;
a second loading capacitor coupled to the open circuit end of the second resonator, the second loading capacitor comprises a first capacitor plate and a second capacitor plate; and
wherein the first and second resonators are disposed in a resonator plane substantially parallel to and vertically displaced from at least one of the respective first capacitor plate and the second capacitor plate of the respective first and second loading capacitors, wherein at least one of the first and second resonators is at least partially overlapped by at least one of;
the first capacitor plate or the second capacitor plate of the first loading capacitor, orthe first capacitor plate or the second capacitor plate of the second loading capacitor; and
wherein the first ground plane includes at least one void area wherein the void area forms a substantially isolated region of the first ground plane;
the filter further comprising an inductor coupled between at least one of the second capacitor plates of the first and second loading capacitors and the first ground plane; and
wherein the value of the inductor is controlled by a predetermined dimension of a conductive coupling region disposed between at least two edges of the at least one void area of the first ground plane.
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Accused Products
Abstract
There is provided an improved filter having resonators substantially disposed between conductive planes which form one or more loading capacitors that are in turn coupled to the resonators. Further, inclusion of a designed void or slot in one or more of the conductive planes allows for control of an introduced transmission zero to manipulate the performance of the filter to achieve desired results, such as improved skirt performance.
23 Citations
25 Claims
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1. A filter disposed within a multilayer substrate, the filter comprising:
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a first and second resonator, the first and second resonators respectively having a short circuit end and an open circuit end, the respective short circuit ends of the first and second resonators coupled to a first ground plane; an input coupled to the first resonator; an output coupled to the second resonator; a first loading capacitor coupled to the open circuit end of the first resonator, the first loading capacitor comprising a first capacitor plate and a second capacitor plate; a second loading capacitor coupled to the open circuit end of the second resonator, the second loading capacitor comprises a first capacitor plate and a second capacitor plate; and wherein the first and second resonators are disposed in a resonator plane substantially parallel to and vertically displaced from at least one of the respective first capacitor plate and the second capacitor plate of the respective first and second loading capacitors, wherein at least one of the first and second resonators is at least partially overlapped by at least one of; the first capacitor plate or the second capacitor plate of the first loading capacitor, or the first capacitor plate or the second capacitor plate of the second loading capacitor; and wherein the first ground plane includes at least one void area wherein the void area forms a substantially isolated region of the first ground plane; the filter further comprising an inductor coupled between at least one of the second capacitor plates of the first and second loading capacitors and the first ground plane; and wherein the value of the inductor is controlled by a predetermined dimension of a conductive coupling region disposed between at least two edges of the at least one void area of the first ground plane. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16)
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17. A filter disposed within a multilayer substrate, the filter comprising:
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first and second resonators, the first and second resonators respectively having a short circuit end and an open circuit end, the respective short circuit ends of the first and second resonators coupled to a first ground plane; an input coupled to the first resonator; an output coupled to the second resonator; at least one loading capacitor coupled to the open circuit end of at least one of the first and second resonators, wherein; the at least one loading capacitor includes a two or more parallel conductive elements including one or more conducting plates and one or more ground plates; the one or more ground plates includes at least one void area in proximity to the conducting plate; and the first and second resonators are substantially disposed in a resonator plane parallel to and vertically displaced from at least one of the conducting plate and the ground plate, wherein at least one of the conducting plate and the ground plate overlap at least one of the first and second resonators; the filter further comprising an inductor coupled between the one or more ground plates of the at least one loading capacitor and the first ground plane; and wherein the value of the inductor is controlled by a predetermined dimension of a conductive coupling region disposed between at least two edges of the at least one void area of the first ground plane. - View Dependent Claims (18, 19, 20, 21, 22, 23, 24, 25)
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Specification