US5617065A — Filter using enhanced quality factor resonator an…

Claim 1

Independent Claim 115 words

A filter using an enhanced quality factor resonator, said filter comprising: a first resonator coupled in shunt with a first port; a first bridging network coupled between said first port and a first node; a second resonator coupled in shunt with said first node; and a second port coupled to said first node, wherein said first and second resonators each comprise acoustic resonators and said first bridging network has an electrical length Θ at a frequency ω in a system having a characteristic admittance Y in accordance with ωC o =YcotΘ, where C o is a shunt capacitance including a clamping capacitance of said first resonator and ω is a center frequency of said filter.

Claim 2

Dependent Claim 115 words

A filter using an enhanced quality factor resonator, said filter comprising: a first resonator coupled in shunt with a first port; a first bridging network coupled between said first port and a first node; a second resonator coupled in shunt with said first node; and a second port coupled to said first node, wherein said first and second resonators each comprise acoustic resonators and said first bridging network has an electrical length Θ at a frequency ω in a system having a characteristic admittance Y in accordance with ωC o =YcotΘ, where C o is a shunt capacitance including a clamping capacitance of said first resonator and ω is a center frequency of said filter.

Claim 3

Dependent Claim 89 words

A filter as claimed in claim 1, wherein said first and second resonators each comprise: a substrate having a surface; a resonator layer including a first electrode, said resonator layer disposed on said surface, said first electrode disposed on a surface of said resonator layer; a cavity disposed between said substrate and said resonator layer; and a second electrode disposed on said substrate and on a surface of said cavity remote from said resonator layer, wherein said second electrode is separated from said resonator layer by a thin gap.

Claim 4

Dependent Claim 105 words

A filter as claimed in claim 1, wherein said first and second resonators each comprise: a substrate having a surface; a resonator layer including a first electrode, said resonator layer comprising single-crystal lithium niobate, lithium tantalate or lithium tetraborate and disposed on said surface, said first electrode comprising aluminum and disposed on a surface of said resonator layer; a cavity disposed between said substrate and said resonator layer; and a second electrode disposed on said substrate and on a surface of said cavity remote from said resonator layer, wherein said second electrode comprises gold and is separated from said resonator layer by a thin gap.

Claim 5

Dependent Claim 82 words

A filter as claimed in claim 1, wherein said first bridging network has an impedance equivalent to that of a transmission line having an electrical length in accordance with Θ 1 =Cos -1 (ω.C.Z o ), and having a characteristic impedance Z in accordance with the relation (Z o /Z) 2 =1-(ω.C.Z o ) 2 , where Z o is the characteristic impedance of said first port and C is a capacitance of a capacitor coupled in shunt with said first node.

Claim 6

Dependent Claim 73 words

A filter as claimed in claim 1, further comprising: a third resonator coupled in shunt with a second node; and a second bridging network coupled between said first node and said second node, wherein said second bridging network has an electrical length Θ 2 =Cos -1 (ω.C.Z o ) at said frequency ω in a system having a characteristic impedance Z o , where C includes a clamping capacitance of said first resonator.

Claim 7

Dependent Claim 142 words

A filter as claimed in claim 4, further comprising: a third resonator coupled in shunt with a second node; a second bridging network coupled between said first node and said second node, wherein said second bridging network has an electrical length Θ 2 =Cos -1 (ω.C.Z o ) at said frequency ω in a system having a characteristic impedance Z o , where C includes a clamping capacitance of said first resonator; a third bridging network coupled between said second node and a third node; a fourth resonator coupled in shunt with said third node; a fourth bridging network coupled between said third node and said second port; and a fifth resonator coupled in shunt with said second port, wherein said third, fourth and fifth resonators also comprise acoustic resonators and said fourth bridging network has an electrical length Θ 4 .

Claim 8

Dependent Claim 32 words

A filter as claimed in claim 6, wherein said second resonator is also coupled in shunt with a first capacitor and said fourth resonator is coupled in shunt with a second capacitor.

Claim 9

Dependent Claim 111 words

A filter comprising: a first resonator coupled in shunt with a first port; a first bridging network coupled between said first port and a first node; a second resonator coupled in shunt with said first node; a second bridging network coupled between said first node and a second node; a third resonator coupled in shunt with said second node; and a second port coupled to said first node, wherein said first and second resonators each comprise acoustic resonators and said first bridging network includes a bridging inductor having inductance L given by L=1/ω 2 C o , where C o includes a clamping capacitance of said first, second or third resonator.

Claim 10

Dependent Claim 111 words

A filter comprising: a first resonator coupled in shunt with a first port; a first bridging network coupled between said first port and a first node; a second resonator coupled in shunt with said first node; a second bridging network coupled between said first node and a second node; a third resonator coupled in shunt with said second node; and a second port coupled to said first node, wherein said first and second resonators each comprise acoustic resonators and said first bridging network includes a bridging inductor having inductance L given by L=1/ω 2 C o , where C o includes a clamping capacitance of said first, second or third resonator.

Claim 11

Dependent Claim 90 words

A filter as claimed in claim 8, wherein said first, second and third resonators each comprise: a substrate having a surface; a resonator layer including a first electrode, said resonator layer disposed on said surface, said first electrode disposed on a surface of said resonator layer; a cavity disposed between said substrate and said resonator layer; and a second electrode disposed on said substrate and on a surface of said cavity remote from said resonator layer, wherein said second electrode is separated from said resonator layer by a thin gap.

Claim 12

Dependent Claim 106 words

A filter as claimed in claim 8, wherein said first, second and third resonators each comprise: a substrate having a surface; a resonator layer including a first electrode, said resonator layer comprising single-crystal lithium niobate, lithium tantalate or lithium tetraborate and disposed on said surface, said first electrode comprising aluminum and disposed on a surface of said resonator layer; a cavity disposed between said substrate and said resonator layer; and a second electrode disposed on said substrate and on a surface of said cavity remote from said resonator layer, wherein said second electrode comprises gold and is separated from said resonator layer by a thin gap.

Claim 13

Dependent Claim 56 words

A filter as claimed in claim 8, further comprising: a third bridging network coupled between said second node and a third node; a fourth resonator coupled in shunt with said third node; a fourth bridging network coupled between said third node and said second port; and a fifth resonator coupled in shunt with said second port.

Claim 14

Dependent Claim 92 words

A filter as claimed in claim 11, wherein said first, second, third, fourth and fifth resonators each comprise: a substrate having a surface; a resonator layer including a first electrode, said resonator layer disposed on said surface, said first electrode disposed on a surface of said resonator layer; a cavity disposed between said substrate and said resonator layer; and a second electrode disposed on said substrate and on a surface of said cavity remote from said resonator layer, wherein said second electrode is separated from said resonator layer by a thin gap.

Claim 15

Dependent Claim 108 words

A filter as claimed in claim 11, wherein said first, second, third, fourth and fifth resonators each comprise: a substrate having a surface; a resonator layer including a first electrode, said resonator layer comprising single-crystal lithium niobate, lithium tantalate or lithium tetraborate and disposed on said surface, said first electrode comprising aluminum and disposed on a surface of said resonator layer; a cavity disposed between said substrate and said resonator layer; and a second electrode disposed on said substrate and on a surface of said cavity remote from said resonator layer, wherein said second electrode comprises gold and is separated from said resonator layer by a thin gap.

Claim 16

Independent Claim 123 words

A method for making a filter comprises steps of: providing a first resonator coupled in shunt with a first port; providing a first bridging network coupled between said first port and a first node; providing a second resonator coupled in shunt with said first node; providing a second bridging network coupled between said first node and a second node; providing a third resonator coupled in shunt with said second node; and providing a second port coupled to said first node, wherein said first and second resonators each comprise acoustic resonators and said first bridging network includes a bridging inductor having inductance L given by L=1/ω 2 C o , where C o includes a clamping capacitance of said first, second or third resonator.

Claim 17

Independent Claim 123 words

A method for making a filter comprises steps of: providing a first resonator coupled in shunt with a first port; providing a first bridging network coupled between said first port and a first node; providing a second resonator coupled in shunt with said first node; providing a second bridging network coupled between said first node and a second node; providing a third resonator coupled in shunt with said second node; and providing a second port coupled to said first node, wherein said first and second resonators each comprise acoustic resonators and said first bridging network includes a bridging inductor having inductance L given by L=1/ω 2 C o , where C o includes a clamping capacitance of said first, second or third resonator.

Claim 18

Dependent Claim 98 words

A method as claimed in claim 14, wherein said steps of providing said first, second and third resonators each comprise: providing a substrate having a surface; providing a resonator layer including a first electrode, said resonator layer disposed on said surface, said first electrode disposed on a surface of said resonator layer; providing a cavity disposed between said substrate and said resonator layer; and providing a second electrode disposed on said substrate and on a surface of said cavity remote from said resonator layer, wherein said second electrode is separated from said resonator layer by a thin gap.

Claim 19

Dependent Claim 114 words

A method as claimed in claim 14, wherein said steps of providing said first, second and third resonators each comprise: providing a substrate having a surface; providing a resonator layer including a first electrode, said resonator layer comprising single-crystal lithium niobate, lithium tantalate or lithium tetraborate and disposed on said surface, said first electrode comprising aluminum and disposed on a surface of said resonator layer; providing a cavity disposed between said substrate and said resonator layer; and providing a second electrode disposed on said substrate and on a surface of said cavity remote from said resonator layer, wherein said second electrode comprises gold and is separated from said resonator layer by a thin gap.

Claim 20

Dependent Claim 62 words

A method as claimed in claim 14, further comprising steps of: providing a third bridging network coupled between said second node and a third node; providing a fourth resonator coupled in shunt with said third node; providing a fourth bridging network coupled between said third node and said second port; and providing a fifth resonator coupled in shunt with said second port.

Claim 21

Dependent Claim 102 words

A method as claimed in claim 17, wherein said steps of providing said first, second, third, fourth and fifth resonators each comprise steps of: providing a substrate having a surface; providing a resonator layer including a first electrode, said resonator layer disposed on said surface, said first electrode disposed on a surface of said resonator layer; providing a cavity disposed between said substrate and said resonator layer; and providing a second electrode disposed on said substrate and on a surface of said cavity remote from said resonator layer, wherein said second electrode is separated from said resonator layer by a thin gap.

Claim 22

Dependent Claim 118 words

A method as claimed in claim 17, wherein said steps of providing said first, second, third, fourth and fifth resonators each comprise steps of: providing a substrate having a surface; providing a resonator layer including a first electrode, said resonator layer comprising single-crystal lithium niobate, lithium tantalate or lithium tetraborate and disposed on said surface, said first electrode comprising aluminum and disposed on a surface of said resonator layer; providing a cavity disposed between said substrate and said resonator layer; and providing a second electrode disposed on said substrate and on a surface of said cavity remote from said resonator layer, wherein said second electrode comprises gold and is separated from said resonator layer by a thin gap.

Annuity Stage	Window Opens	Payment Deadline	Surcharge Period Until	Estimated Fee	Status
3.5 Years (Year 4)	2000-03-31	2000-09-30	2001-04-01	$2000.00	Window Closed / Lapsed
7.5 Years (Year 8)	2004-03-31	2004-09-30	2005-04-01	$3760.00	Window Closed / Lapsed
11.5 Years (Year 12)	2008-03-31	2008-09-30	2009-04-01	$7700.00	Window Closed / Lapsed

Filter using enhanced quality factor resonator and method

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