Patent US3845423A successfully refreshed from Google Patents.
US3845423A
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Low loss high-q filter
Assignee: TDK Micronas GmbH
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Filing: 1973-09-26
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Granted: 1974-10-29
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Expires: 1993-09-26
Abstract
Abstract A low loss high-Q filter is disclosed herein having a restricted bandpass of 7.25-7.75 GHz with an in-band insertion loss of 0.5db, an out-of-band rejection greater than 80db and negligible spurious responses in-band. This is accomplished by providing two types of directly coupled variable resonators. The first type of variable resonators includes a series of twelve right circular cylindrical cavity resonators directly coupled in series with each other. Two of the second type of variable resonators are provided with each of these second type of variable resonators being directly coupled to opposite ends of the series coupled cylindrical resonators. Each of these second type of variable resonators include three directly coupled rectangular waveguide cavity resonators.
Inventors
- 👤 H Scheiner
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 09:03
CPC Classifications
H; H01; H01P; H01P1/00; H01P1/20; H01P1/207; H01P1/208
Claims Analysis
Total Claims: 20
Claim 1
Independent Claim
317 words
A low loss high-Q filter comprising: a plurality of right circular cylindrical cavity resonators; a first plurality of rectangular waveguide cavity resonators connected to one end of said cylindrical resonators; a second plurality of rectangular waveguide cavity resonators connected to the other end of said cylindrical resonators; first means for direct coupling of said cylindrical resonators in series and for direct coupling to said first and second waveguide resonators; and second means for direct coupling of each of said first and second plurality of waveguide resonators in series; each of said cylindrical resonators having a longitudinal axis and each of said cylindrical resonators being oriented with respect to each other so that each of said longitudinal axes are parallel with respect to each other; said first means including a plurality of circular apertures, each of said plurality of apertures being disposed adjacent the bottom of an associated one of said cylindrical resonator, at right angles to said longitudinal axis of said associated one of said cylindrical resonators and to extend through the cylindrical wall of said associated one of said cylindrical resonators to provide direct coupling between adjacent ones of said cylindrical resonators, and a pair of circular apertures, one of said pair of circular apertures being disposed adjacent the bottom of a first of said cylindrical resonators, at right angles to said longitudinal axis of said first of said cylindrical resonators and to extend through the cylindrical wall of said first of said cylindrical resonators to provide direct coupling to said first plurality of waveguide resonators, and the other of said pair of circular apertures being disposed adjacent the bottom of a last of said cylindrical resonators, at right angles to said longitudinal axis of said last of said cylindricaL resonators and to extend through the cylindrical wall of said last of said cylindrical resonators to provide direct coupling to said second plurality of waveguide resonators.
Claim 2
Dependent Claim
317 words
A low loss high-Q filter comprising: a plurality of right circular cylindrical cavity resonators; a first plurality of rectangular waveguide cavity resonators connected to one end of said cylindrical resonators; a second plurality of rectangular waveguide cavity resonators connected to the other end of said cylindrical resonators; first means for direct coupling of said cylindrical resonators in series and for direct coupling to said first and second waveguide resonators; and second means for direct coupling of each of said first and second plurality of waveguide resonators in series; each of said cylindrical resonators having a longitudinal axis and each of said cylindrical resonators being oriented with respect to each other so that each of said longitudinal axes are parallel with respect to each other; said first means including a plurality of circular apertures, each of said plurality of apertures being disposed adjacent the bottom of an associated one of said cylindrical resonator, at right angles to said longitudinal axis of said associated one of said cylindrical resonators and to extend through the cylindrical wall of said associated one of said cylindrical resonators to provide direct coupling between adjacent ones of said cylindrical resonators, and a pair of circular apertures, one of said pair of circular apertures being disposed adjacent the bottom of a first of said cylindrical resonators, at right angles to said longitudinal axis of said first of said cylindrical resonators and to extend through the cylindrical wall of said first of said cylindrical resonators to provide direct coupling to said first plurality of waveguide resonators, and the other of said pair of circular apertures being disposed adjacent the bottom of a last of said cylindrical resonators, at right angles to said longitudinal axis of said last of said cylindricaL resonators and to extend through the cylindrical wall of said last of said cylindrical resonators to provide direct coupling to said second plurality of waveguide resonators.
Claim 3
Dependent Claim
20 words
A filter according to claim 1, wherein each of said first and second plurality of waveguide resonators are iris coupled.
Claim 4
Dependent Claim
27 words
A filter according to claim 1, wherein said cylindrical resonators are formed in an aluminum block and the inner surfaces of said cylindrical resonators are silver plated.
Claim 5
Dependent Claim
35 words
A filter according to claim 2, further including a plurality of tuning means, each of said plurality of tuning means being disposed in a different one of said cylindrical resonators coaxial of said longitudinal axis.
Claim 6
Dependent Claim
33 words
A filter according to claim 2, further including a plurality of tuning means, each of said tuning means being disposed in a different one of said first and second plurality of waveguide resonators.
Claim 7
Dependent Claim
22 words
A filter according to claim 2, wherein each of said irises are oriented at right angles with respect to said longitudinal axes.
Claim 8
Dependent Claim
67 words
A filter according to claim 2, further including a first plurality of tuning means, each of said first plurality of tuning means being disposed in a different one of said cylindrical resonators coaxial of said longitudinal axis; and a second plurality of tuning means, each of said second plurality of tuning means being disposed in a different one of said first and second plurality of waveguide resonators.
Claim 9
Dependent Claim
20 words
A filter according to claim 4, wherein each of said plurality of tuning means includes a choke coupled double plunger.
Claim 10
Dependent Claim
19 words
A filter according to claim 5, wherein each of said plurality of tuning means includes a capacitive tuning screw.
Claim 11
Dependent Claim
35 words
A filter according to claim 7, wherein each of said first plurality of tuning means includes a choke coupled double plunger; and each of said second plurality of tuning means includes a capacitive tuning screw.
Claim 12
Dependent Claim
27 words
A filter according to claim 10, wherein said cylindrical resonators are formed in an aluminum block and the inner surfaces of said cylindrical resonators are silver plated.
Claim 13
Dependent Claim
20 words
A filter according to claim 11, wherein said first and second waveguide resonators are formed in a rectangular copper waveguide.
Claim 14
Dependent Claim
20 words
A filter according to claim 3, wherein said first and second waveguide resonators are formed in a rectangular copper waveguide.
Claim 15
Dependent Claim
20 words
A filter according to claim 13, wherein each of said first and second plurality of waveguide resonators are iris coupled.
Claim 16
Dependent Claim
22 words
A filter according to claim 14, wherein each of said irises are oriented at right angles with respect to said longitudinal axes.
Claim 17
Dependent Claim
118 words
A low loss high-Q filter comprising: a plurality of right circular cylindrical cavity resonators; a first plurality of rectangular waveguide cavity resonators connected to one end of said cylindrical resonators; a second plurality of rectangular waveguide cavity resonators connected to the other end of said cylindrical resonators; first means for direct coupling of said cylindrical resonators in series and for direct coupling to said first and second waveguide resonators; and second means for direct coupling of each of said first and second plurality of waveguide resonators in series; said filter being an eighteen pole, 0.01 decibel ripple, Chebyshev filter with said cylindrical resonators equal to 12 and each of said first and second waveguide resonators equal to 3.
Claim 18
Dependent Claim
118 words
A low loss high-Q filter comprising: a plurality of right circular cylindrical cavity resonators; a first plurality of rectangular waveguide cavity resonators connected to one end of said cylindrical resonators; a second plurality of rectangular waveguide cavity resonators connected to the other end of said cylindrical resonators; first means for direct coupling of said cylindrical resonators in series and for direct coupling to said first and second waveguide resonators; and second means for direct coupling of each of said first and second plurality of waveguide resonators in series; said filter being an eighteen pole, 0.01 decibel ripple, Chebyshev filter with said cylindrical resonators equal to 12 and each of said first and second waveguide resonators equal to 3.
Claim 19
Dependent Claim
43 words
A filter according to claim 16, wherein each of said cylindrical resonators are formed in an aluminum block and the inner surfaces of said cylindrical resonators are silver plated; and said first and second waveguide resonators are formed in a rectangular copper waveguide.
Claim 20
Dependent Claim
144 words
A filter according to claim 17, wherein said aluminum block includes two end portions and a central portion, said end portion and said centrAl portion being joinable to form said twelve cylindrical resonators, each of said end portions having two and a half cylindrical resonators of said 12 cylindrical resonators, and said central portion having a first half cylindrical resonator of said twelve cylindrical resonators to join with said half cylindrical resonator of one of said end portion to form a full cylindrical resonator of said 12 resonators, a second half cylindrical resonator of said 12 cylindrical resonator to join with said half cylindrical resonator of the other of said end portion to form a full cylindrical resonator of said twelve cylindrical resonators and six full cylindrical resonators of said twelve cylindrical resonators disposed in series between said first and second half cylindrical resonator.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-10-28 | 1978-04-29 | 1978-10-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-10-28 | 1982-04-29 | 1982-10-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-10-28 | 1986-04-29 | 1986-10-29 | $7700.00 | Window Closed / Lapsed |