US5136269A
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High-frequency band-pass filter having multiple resonators for providing high pass-band attenuation
Assignee: Fraunhofer-Gesellschaft zur Förderung der Angewandten Forschung eV
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Filing: 1991-02-22
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Granted: 1992-08-04
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Expires: 2011-02-22
Abstract
Abstract A high-frequency band-pass filter has an input resonator, a middle resonator and an output resonator which are coupled in parallel. The input resonator and the output resonator are capacitively shortened quarter-wave line resonators. To improve the attenuation characteristics, the middle resonator is designed as a capacitively shortened half-wave resonator. The input resonator extends along a first part of the length of the middle resonator. The output resonator extends along a second part of the length of the middle resonator.
Inventors
- 👤 Dieter Seitzer
- 👤 Thomas Brockdorff
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 23:19
CPC Classifications
H; H01; H01P; H01P1/00; H01P1/20; H01P1/201; H01P1/203; H01P1/20327; H01P1/20354; H01P1/20363
Claims Analysis
Total Claims: 22
Claim 1
Independent Claim
197 words
High-frequency band-pass filter comprising an input resonator (2), a middle resonator (3) and an output resonator (4), the input resonator (2) is coupled in parallel with the middle resonator (3) and the middle resonator (3) is coupled in parallel with the output resonator (4), and the input resonator (2) and the output resonator (4) comprise capacitively shortened quarter-wave line resonators, characterized in that, the middle resonator (3) is designed as a capacitively shortened half-wave line resonator which is connected at both ends (7, 11) to ground and at its center (14) to a first capacitor (9), that the input resonator (2) and the output resonator (4) are staggered with respect to one another in the direction of their longitudinal extension, and that the input resonator (2) extends along a first part of a length of the middle resonator (3) and the output resonator (4) extends along a second part of the length of the middle resonator (3); the input resonator (2) and the output resonator (4) are coupled together with their adjacent facing ends (5, 6) connected to a ground and with their opposite ends (10, 11) respectively connected to a second, and third capacitor (12, 13).
Claim 2
Dependent Claim
197 words
High-frequency band-pass filter comprising an input resonator (2), a middle resonator (3) and an output resonator (4), the input resonator (2) is coupled in parallel with the middle resonator (3) and the middle resonator (3) is coupled in parallel with the output resonator (4), and the input resonator (2) and the output resonator (4) comprise capacitively shortened quarter-wave line resonators, characterized in that, the middle resonator (3) is designed as a capacitively shortened half-wave line resonator which is connected at both ends (7, 11) to ground and at its center (14) to a first capacitor (9), that the input resonator (2) and the output resonator (4) are staggered with respect to one another in the direction of their longitudinal extension, and that the input resonator (2) extends along a first part of a length of the middle resonator (3) and the output resonator (4) extends along a second part of the length of the middle resonator (3); the input resonator (2) and the output resonator (4) are coupled together with their adjacent facing ends (5, 6) connected to a ground and with their opposite ends (10, 11) respectively connected to a second, and third capacitor (12, 13).
Claim 3
Dependent Claim
56 words
High-frequency band-pass filter according to claim 1, characterized in that an input line (15) and an output line (16) are connected with a direct tap to the input resonator (2) and the output resonator (4), respectively, at a point of connection lying between ends (5, 10; 6, 11) of the input and output resonators (2, 4).
Claim 4
Dependent Claim
50 words
High-frequency band-pass filter according to claim 1, characterized in that the capacitance of the second or third capacitor, respectively (12, 13) is selected such that the length of the input resonator (12) or, respectively, the output resonator (4) amounts to 10% to 30% of the length of a quarter-wave resonator.
Claim 5
Dependent Claim
36 words
High-frequency band-pass filter according to claim 3, characterized in that the length of the input resonator (2) and that of the output resonator (4), respectively, amounts to approximately 15% of the length of a quarter-wave resonator.
Claim 6
Dependent Claim
40 words
High-frequency band-pass filter according to claim 1, characterized in that the capacitance of the first capacitor (9) is selected such that the length of the middle resonator (3) amounts to 10% to 30% of the length of a half-wave resonator.
Claim 7
Dependent Claim
28 words
High-frequency band-pass filter according to claim 5, characterized in that the length of the middle resonator (3) amounts to approximately 15% of the length of a half-wave resonator.
Claim 8
Dependent Claim
31 words
High-frequency band-pass filter according to claim 1, characterized in that the capacitance of the first capacitor (9) corresponds to double the capacitance value of the second or third capacitor (12, 13).
Claim 9
Dependent Claim
22 words
High-frequency band-pass filter according to claim 1, characterized in that the filter (1) is developed on a substrate in strip line engineering.
Claim 10
Dependent Claim
30 words
High-frequency band-pass filter according to claim 1, characterized in that the filter is designed with lines at a distance from a backing material and surrounded by air as a dielectric.
Claim 11
Dependent Claim
30 words
High-frequency band-pass filter according to claim 1, characterized in that the capacitors (9, 12, 13) are adjustable in their capacitance value for the purpose of tuning the band-pass filter (1).
Claim 12
Independent Claim
198 words
A method of operating a high-frequency band-pass filter with an input resonator (2), a middle resonator (3) and an output resonator (4), the input resonator (2) is coupled in parallel with the middle resonator (3) and the middle resonator (3) is coupled in parallel with the output resonator (4), and the input resonator (2) and the output resonator (4) comprise capacitively shortened quarter-wave line resonators comprising the steps of: providing the middle resonator (3) as a capacitively shortened half-wave line resonator which is connected at both ends (7, 11) to ground and at its enter (14) to a first capacitor (9), staggering the input resonator (2) and the output resonator (4) with respect to one another in the direction of their longitudinal extension, and extending the input resonator (2) along a first part of a length of the middle resonator (3) and extending the output resonator (4) along a second part of the length of the middle resonator (3); the input resonator (2) and the output resonator (4) are coupled together with their adjacent facing ends (5, 6) connected to ground and with their opposite ends (10, 11) respectively connected to a second, and third capacitor (12, 13).
Claim 13
Independent Claim
198 words
A method of operating a high-frequency band-pass filter with an input resonator (2), a middle resonator (3) and an output resonator (4), the input resonator (2) is coupled in parallel with the middle resonator (3) and the middle resonator (3) is coupled in parallel with the output resonator (4), and the input resonator (2) and the output resonator (4) comprise capacitively shortened quarter-wave line resonators comprising the steps of: providing the middle resonator (3) as a capacitively shortened half-wave line resonator which is connected at both ends (7, 11) to ground and at its enter (14) to a first capacitor (9), staggering the input resonator (2) and the output resonator (4) with respect to one another in the direction of their longitudinal extension, and extending the input resonator (2) along a first part of a length of the middle resonator (3) and extending the output resonator (4) along a second part of the length of the middle resonator (3); the input resonator (2) and the output resonator (4) are coupled together with their adjacent facing ends (5, 6) connected to ground and with their opposite ends (10, 11) respectively connected to a second, and third capacitor (12, 13).
Claim 14
Dependent Claim
53 words
A method according to claim 11, wherein an input line (15) and an output line (16) are connected with a direct tap to the input resonator (2) and the output resonator (4), respectively, at a point of connection lying between ends (5, 10; 6, 11) of the input and output resonators (2, 4).
Claim 15
Dependent Claim
47 words
A method according to claim 11, wherein the capacitance of the second or third capacitor, respectively (12, 13) is selected such that the length of the input resonator (2) or, respectively, the output resonator (4) amounts to 10% or 30% of the length of a quarter-wave resonator.
Claim 16
Dependent Claim
33 words
A method according to claim 13, wherein the length of the input resonator (2) and that of the output resonator (4), respectively, amounts to approximately 15% of the length of a quarter-wave resonator.
Claim 17
Dependent Claim
37 words
A method according to claim 11, wherein the capacitance of the first capacitor (9) is selected such that the length of the middle resonator (3) amounts to 10% to 30% of the length of a half-wave resonator.
Claim 18
Dependent Claim
25 words
A method according to claim 15, wherein the length of the middle resonator (3) amounts to approximately 15% of the length of a half-wave resonator.
Claim 19
Dependent Claim
28 words
A method according to claim 11, wherein the capacitance of the first capacitor (9) corresponds to double the capacitance value of the second or third capacitor (12, 13).
Claim 20
Dependent Claim
19 words
A method according to claim 11, wherein the filter (1) is developed on a substrate in strip line engineering.
Claim 21
Dependent Claim
27 words
A method according to claim 11, wherein the filter is designed with lines at a distance from a backing material and surrounded by air as a dielectric.
Claim 22
Dependent Claim
27 words
A method according to claim 11, wherein the capacitors (9, 12, 13) are adjustable in their capacitance value for the purpose of tuning the band-pass filter (1).
References Cited (Backward Citations)
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US4578656A
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JPS61177001A
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FR2613538A1
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US4992759A
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US5021757A
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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) | 1995-08-04 | 1996-02-03 | 1996-08-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1999-08-04 | 2000-02-03 | 2000-08-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2003-08-04 | 2004-02-03 | 2004-08-04 | $7700.00 | Window Closed / Lapsed |