US5760663A
Expired / Lapsed
US
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Elliptic baw resonator filter and method of making the same
Assignee: Motorola Solutions Inc
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Filing: 1996-08-23
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Granted: 1998-06-02
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Expires: 2016-08-23
Abstract
Abstract An odd order N-pole, (N-1)/2 zero elliptic filter (300) is provided having (N-1)/2 BAW resonators (302 and 304). The first Bulk Acoustic Wave (BAW) resonator (302) operates at a first mode number and a first center frequency and the second BAW resonator (304) operates at a second mode number, and a first center frequency. Operating BAW resonators (302 and 304) at differing modes allows the unwanted passbands (201) of the first BAW resonator (302) to be attenuated by the stopband of the second BAW resonator (304) and vice versa.
Inventors
- 👤 Bortolo M. Pradal
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 00:41
CPC Classifications
H; H03; H03H; H03H9/00; H03H9/46; H03H9/54; H03H9/02; H03H9/02007; H03H9/02062; H03H9/02078; H03H3/00; H03H3/007; H03H3/02; H03H3/04; H03H9/542; H03H9/56
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
64 words
A filter comprising: a first Bulk Acoustic Wave (BAW) resonator operating at a first mode number, and having a first electrode thickness, said BAW resonator operating at a first center frequency; and a second BAW resonator operating at a second mode number differing from the first mode number, and having a second electrode thickness, said BAW resonator operating at substantially the first center frequency.
Claim 2
Dependent Claim
64 words
A filter comprising: a first Bulk Acoustic Wave (BAW) resonator operating at a first mode number, and having a first electrode thickness, said BAW resonator operating at a first center frequency; and a second BAW resonator operating at a second mode number differing from the first mode number, and having a second electrode thickness, said BAW resonator operating at substantially the first center frequency.
Claim 3
Dependent Claim
15 words
The filter of claim 1 further comprising a capacitor coupled to the first BAW resonator.
Claim 4
Dependent Claim
17 words
The filter of claim 1 wherein the first electrode thickness is unequal to the second electrode thickness.
Claim 5
Dependent Claim
16 words
The filter of claim 1 further comprising a transmission line coupled to the first BAW resonator.
Claim 6
Dependent Claim
16 words
The filter of claim 1 further comprising a design coil coupled to the first BAW resonator.
Claim 7
Dependent Claim
40 words
An odd order, N-pole, (N-1)/2 zero filter comprising: (N-1)/2 bulk acoustic wave (BAW) resonators, where N>4 and a mode number of at least two resonators differ; and N components selected from the group consisting of design coils and transmission lines.
Claim 8
Dependent Claim
40 words
An odd order, N-pole, (N-1)/2 zero filter comprising: (N-1)/2 bulk acoustic wave (BAW) resonators, where N>4 and a mode number of at least two resonators differ; and N components selected from the group consisting of design coils and transmission lines.
Claim 9
Dependent Claim
16 words
The filter of claim 6 wherein an electrode thickness of at least two BAW resonators differ.
Claim 10
Dependent Claim
9 words
The filter of claim 6 further comprising N capacitors.
Claim 11
Independent Claim
77 words
A method of making an odd order, N-pole, (N-1)/2 zero elliptic filter, the method comprising the steps of: photolithographically creating on a substrate, a first Bulk Acoustic Wave (BAW) resonator operating at a first mode number, said BAW resonator operating at a first center frequency; and photolithographically creating on the substrate, a second BAW resonator operating at a second mode number differing from the first mode number, said BAW resonator operating at substantially the first center frequency.
Claim 12
Independent Claim
77 words
A method of making an odd order, N-pole, (N-1)/2 zero elliptic filter, the method comprising the steps of: photolithographically creating on a substrate, a first Bulk Acoustic Wave (BAW) resonator operating at a first mode number, said BAW resonator operating at a first center frequency; and photolithographically creating on the substrate, a second BAW resonator operating at a second mode number differing from the first mode number, said BAW resonator operating at substantially the first center frequency.
Claim 13
Dependent Claim
19 words
The method of claim 9 further comprising the step of attaching a transmission line to the first BAW resonator.
Claim 14
Dependent Claim
19 words
The method of claim 9 further comprising the step a attaching a design coil to the first BAW resonator.
Claim 15
Dependent Claim
17 words
The method of claim 9 further comprising the step attaching a capacitor to the first BAW resonator.
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| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
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| 3.5 Years (Year 4) | 2001-06-01 | 2001-12-01 | 2002-06-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2005-06-01 | 2005-12-01 | 2006-06-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2009-06-01 | 2009-12-01 | 2010-06-02 | $7700.00 | Window Closed / Lapsed |