US5017897A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Split ring resonator bandpass filter with differential output
Assignee: Motorola Solutions Inc
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Filing: 1990-08-06
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Granted: 1991-05-21
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Expires: 2010-08-06
Abstract
Abstract A 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 first edge being coupled to the second edge of the first microstrip split-ring resonator, and the second edge of the second microstrip split-ring resonator comprising a gap (26) therein and a balanced output (30, 32).
Inventors
- 👤 Leng H. Ooi
- 👤 Peter J. Yeh
- 👤 Branko Avanic
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 16:15
CPC Classifications
H; H01; H01P; H01P1/00; H01P1/20; H01P1/201; H01P1/203; H01P1/20327; H01P1/20354; H01P1/20381; H01P5/00; H01P5/08; H01P5/10
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
144 words
A 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, the first edge being coupled to the second edge of the first microstrip split-ring resonator, 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.
Claim 2
Dependent Claim
144 words
A 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, the first edge being coupled to the second edge of the first microstrip split-ring resonator, 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.
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 1, 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
159 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, the first edge being coupled to the second edge of the first microstrip split-ring resonator, 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.
Claim 8
Dependent Claim
159 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, the first edge being coupled to the second edge of the first microstrip split-ring resonator, 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.
Claim 9
Dependent Claim
25 words
The communication device of claim 6, wherein said bandpass filter further comprising a first capacitor coupled across the gap in the first microstrip split-ring resonator.
Claim 10
Dependent Claim
25 words
The communication device of claim 6, wherein said bandpass filter further comprising a second capacitor coupled across the gap in the second microstrip split-ring resonator.
Claim 11
Dependent Claim
31 words
The communication device of claim 6, 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 12
Dependent Claim
33 words
The communication device of claim 6, 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 13
Dependent Claim
24 words
The communication device of claim 6 further comprising a frequency mixer having a balanced input coupled to the balanced output of the bandpass filter.
Claim 14
Dependent Claim
13 words
The communication device of claim 6 wherein the communication device is a radio.
References Cited (Backward Citations)
US4749963A
Cited
JPS6338304A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1994-05-20 | 1994-11-19 | 1995-05-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-05-20 | 1998-11-19 | 1999-05-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2002-05-20 | 2002-11-19 | 2003-05-21 | $7700.00 | Window Closed / Lapsed |