US5164690A
Expired / Lapsed
US
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Multi-pole split ring resonator bandpass filter
Assignee: Motorola Solutions Inc
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Filing: 1991-06-24
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Granted: 1992-11-17
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Expires: 2011-06-24
Abstract
Abstract A multipole bandpass filter (40) comprises a first microstrip split-ring resonator (12), having at least a first edge and a second edge, the first edge having a gap (20) therein, and an input. The bandpass filter (40) also comprises a second microstrip split-ring resonator (14), having at least a first edge and a second edge, the second edge of the second microstrip split-ring resonator comprising a gap (26) therein and a balanced output (30, 32). The bandpass filter also includes at least one straight line quasi-combline resonator (22), disposed between the first microstrip split-ring resonator, and the second microstrip split-ring resonator.
Inventors
- 👤 Peter J. Yeh
- 👤 Branko Avanic
- 👤 Leng H. Ooi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 00:39
CPC Classifications
H; H01; H01P; H01P1/00; H01P1/20; H01P1/201; H01P1/203; H01P1/20327; H01P1/20354; H01P1/20381
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
151 words
A multi-pole bandpass filter, comprising: a first port; a first microstrip split-ring resonator, having at least a first edge and a second edge, the first edge having a gap therein, and the first edge being coupled to the first port; a second microstrip split-ring resonator, having at least a first edge and a second edge, and the second edge of the second microstrip split-ring resonator comprising a gap therein; a second port coupled to the second edge of the second microstrip split-ring resonator, the second port comprising a first terminal located at one side of the gap in the second edge of the second microstrip split-ring resonator, and a second terminal symmetrically located at the other side of the gap in the second edge of the second microstrip split-ring resonator; and at least one straight line quasi-combine resonator, disposed between the first microstrip split-ring resonator, and the second microstrip split-ring resonator.
Claim 2
Dependent Claim
151 words
A multi-pole bandpass filter, comprising: a first port; a first microstrip split-ring resonator, having at least a first edge and a second edge, the first edge having a gap therein, and the first edge being coupled to the first port; a second microstrip split-ring resonator, having at least a first edge and a second edge, and the second edge of the second microstrip split-ring resonator comprising a gap therein; a second port coupled to the second edge of the second microstrip split-ring resonator, the second port comprising a first terminal located at one side of the gap in the second edge of the second microstrip split-ring resonator, and a second terminal symmetrically located at the other side of the gap in the second edge of the second microstrip split-ring resonator; and at least one straight line quasi-combine resonator, disposed between the first microstrip split-ring resonator, and the second microstrip split-ring resonator.
Claim 3
Dependent Claim
21 words
The bandpass filter of claim 1, further comprising a first capacitor coupled across the gap in the first microstrip split-ring resonator.
Claim 4
Dependent Claim
21 words
The bandpass filter of claim 1, further comprising a second capacitor coupled across the gap in the second microstrip split-ring resonator.
Claim 5
Dependent Claim
31 words
The bandpass filter of claim 1, wherein the first port comprises a first terminal located at one side of the gap in the first edge of the first microstrip split-ring resonator.
Claim 6
Dependent Claim
33 words
The bandpass filter of claim 4, wherein the first port comprises a second terminal symmetrically located at the other side of the gap in the first edge of the first microstrip split-ring resonator.
Claim 7
Dependent Claim
61 words
The bandpass filter of claim 1, wherein the at least one straight line quasi-combline resonator comprises: first and second ends; a first capacitor disposed between the first end of the at least one straight line quasi-combline resonator, and ground potential; and a second capacitor disposed between the second end of the at least one straight line quasi-combline resonator, and ground potential.
Claim 8
Dependent Claim
62 words
The bandpass filter of claim 1, wherein: the first microstrip split-ring resonator comprises a feed terminal for coupling to a direct current voltage at a virtual ground point in the first microstrip split-ring resonator; and the second microstrip split-ring resonator comprises a feed terminal for couping to a direct current voltage at a virtual ground point in the second microstrip split-ring resonator.
Claim 9
Dependent Claim
174 words
A communication device comprising: receiver means for receiving radio-frequency signals; a bandpass filter, coupled to the receiver means, comprising: a first port; a first microstrip split-ring resonator, having at least a first edge and a second edge, the first edge having a gap therein, and the first edge being coupled to the first port; a second microstrip split-ring resonator, having at least a first edge and a second edge, and the second edge of the second microstrip split-ring resonator comprising a gap therein; a second port coupled to the second edge of the second microstrip split-ring resonator, the second port comprising a first terminal located at one side of the gap in the second edge of the second microstrip split-ring resonator, and a second terminal symmetrically located at the other side of the gap in the second edge of the second microstrip split-ring resonator for providing a balanced output for the bandpass filter; and at least one straight line quasi-combline resonator, disposed between the first microstrip split-ring resonator, and the second microstrip split-ring resonator.
Claim 10
Dependent Claim
174 words
A communication device comprising: receiver means for receiving radio-frequency signals; a bandpass filter, coupled to the receiver means, comprising: a first port; a first microstrip split-ring resonator, having at least a first edge and a second edge, the first edge having a gap therein, and the first edge being coupled to the first port; a second microstrip split-ring resonator, having at least a first edge and a second edge, and the second edge of the second microstrip split-ring resonator comprising a gap therein; a second port coupled to the second edge of the second microstrip split-ring resonator, the second port comprising a first terminal located at one side of the gap in the second edge of the second microstrip split-ring resonator, and a second terminal symmetrically located at the other side of the gap in the second edge of the second microstrip split-ring resonator for providing a balanced output for the bandpass filter; and at least one straight line quasi-combline resonator, disposed between the first microstrip split-ring resonator, and the second microstrip split-ring resonator.
Claim 11
Dependent Claim
25 words
The communication device of claim 8, wherein the bandpass filter further comprises a first capacitor coupled across the gap in the first microstrip split-ring resonator.
Claim 12
Dependent Claim
24 words
The communication device of claim 8, wherein the bandpass filter further comprises a second capacitor coupled across the gap in the second microstrip split-resonator.
Claim 13
Dependent Claim
31 words
The communication device of claim 8, wherein the first port comprises a first terminal located at one side of the gap in the first edge of the first microstrip split-ring resonator.
Claim 14
Dependent Claim
33 words
The communication device of claim 11, wherein the first port comprises a second terminal symmetrically located at the other side of the gap in the first edge of the first microstrip split-ring resonator.
Claim 15
Dependent Claim
24 words
The communication device of claim 8, further comprising a frequency mixer having a balanced input coupled to the balanced output of the bandpass filter.
Claim 16
Dependent Claim
61 words
The communication device of claim 8, wherein the at least one straight line quasi-combline resonator comprises: first and second ends; a first capacitor disposed between the first end of the at least one straight line quasi-combline resonator, and ground potential; and a second capacitor disposed between the second end of the at least one straight line quasi-combline resonator, and ground potential.
Claim 17
Dependent Claim
62 words
The communication device of claim 8, wherein: the first microstrip split-ring resonator comprises a feed terminal for coupling to a direct current voltage at a virtual ground point in the first microstrip split-ring resonator; and the second microstrip split-ring resonator comprises a feed terminal for coupling to a direct current voltage at a virtual ground point in the second microstrip split-ring resonator.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1995-11-17 | 1996-05-18 | 1996-11-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1999-11-17 | 2000-05-18 | 2000-11-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2003-11-17 | 2004-05-18 | 2004-11-17 | $7700.00 | Window Closed / Lapsed |