US4757285A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Filter for short electromagnetic waves formed as a comb line or interdigital line filters
Assignee: Siemens AG
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Filing: 1987-07-02
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Granted: 1988-07-12
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Expires: 2007-07-02
Abstract
Abstract Microwave filters which have the best electrical characteristics for small volumes are required in radio communications particularly in traffic broadcast communication links and the invention provides filters formed as comb line or interdigital line filters in which the inner resonator conductors are formed as flat spirals.
Inventors
- 👤 Heinz Krause
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 15:09
CPC Classifications
H; H01; H01P; H01P7/00; H01P7/005; H01P1/00; H01P1/20; H01P1/201; H01P1/205
Claims Analysis
Total Claims: 18
Claim 1
Independent Claim
121 words
A comb line filter for short electromagnetic waves comprising, a housing (G), an output coupling lead (A) and an input coupling lead (E) connected to opposite sides of said housing, a plurality of spiral shaped resonators (SpR 1 , SpR 2 , SpR 3 , SpR 4 ) mounted in said housing, a plurality of line coupling means (K 1 , K 2 , K 3 ) mounted in said housing and said resonators and said line couplings alternately, connected in series between said input coupling lead (E) and said output coupling lead (A) and wherein the shape and size of said housing is such that characteristic impedance Z of said filter is in the range of 50 to 150 ohms.
Claim 2
Dependent Claim
121 words
A comb line filter for short electromagnetic waves comprising, a housing (G), an output coupling lead (A) and an input coupling lead (E) connected to opposite sides of said housing, a plurality of spiral shaped resonators (SpR 1 , SpR 2 , SpR 3 , SpR 4 ) mounted in said housing, a plurality of line coupling means (K 1 , K 2 , K 3 ) mounted in said housing and said resonators and said line couplings alternately, connected in series between said input coupling lead (E) and said output coupling lead (A) and wherein the shape and size of said housing is such that characteristic impedance Z of said filter is in the range of 50 to 150 ohms.
Claim 3
Dependent Claim
50 words
A filter according to claim 1, including tuning elements (A 1 . . . A 4 ) are mounted to said housing and positioned so that at least one tuning element extends into the field space of one of said spiral resonators (SpR 1 . . . SpR 4 ).
Claim 4
Dependent Claim
54 words
A filter according to claim 2, wherein said tuning elements (A 1 . . . A 4 ) are formed as tuning screws whose longitudinal axis are perpendicularly to the plane of said spiral resonators (SpR 1 . . . SpR 4 ) and said screws extend toward the centers of said spiral resonators.
Claim 5
Dependent Claim
22 words
A filter accoridng to claim 1 wherein the shape of said spiral resonators (SpR 1 ) deviate from a constant pitch spiral.
Claim 6
Dependent Claim
14 words
A filter according to claim 4 wherein said spiral resonators (SpR) are rectangularly shaped.
Claim 7
Dependent Claim
19 words
A filter according to claim 1 wherein the conductor cross-section of said spiral resonators (SpR) change steadily or discontinuously.
Claim 8
Dependent Claim
34 words
A filter according to claim 1 wherein said spiral resonators (SpR 1 . . . SpR 4 ) are mounted such that the planes formed by the spiral resonators lie in the same plane.
Claim 9
Dependent Claim
34 words
A filter according to claim 1 wherein said spiral resonators (SpR 1 . . . SpR 5 ) are mounted such that the planes formed by said spiral resonators are parallel to each other.
Claim 10
Dependent Claim
121 words
An interdigital line filter for short electromagnetic waves comprising, a housing (G), an output coupling lead (A) and an input coupling lead (E) connected to opposite sides of said housing, a plurality of spiral shaped resonators (SpR 1 , SpR 2 , SpR 3 , SpR 4 ) mounted in said housing, a plurality of line coupling means (K 1 , K 2 , K 3 ) mounted in said housing and said resonators and said line couplings, alternately, connected in series between said input coupling lead (E) and said output coupling lead (A) and wherein the shape and size of said housing is such that characteristic impedance Z of said filter is in the range of 50 to 150 ohms.
Claim 11
Dependent Claim
121 words
An interdigital line filter for short electromagnetic waves comprising, a housing (G), an output coupling lead (A) and an input coupling lead (E) connected to opposite sides of said housing, a plurality of spiral shaped resonators (SpR 1 , SpR 2 , SpR 3 , SpR 4 ) mounted in said housing, a plurality of line coupling means (K 1 , K 2 , K 3 ) mounted in said housing and said resonators and said line couplings, alternately, connected in series between said input coupling lead (E) and said output coupling lead (A) and wherein the shape and size of said housing is such that characteristic impedance Z of said filter is in the range of 50 to 150 ohms.
Claim 12
Dependent Claim
50 words
A filter according to claim 9, including tuning elements (A 1 . . . A 4 ) are mounted to said housing and positioned so that at least one tuning element extends into the field space of one of said spiral resonators (SpR 1 . . . SpR 4 ).
Claim 13
Dependent Claim
54 words
A filter according to claim 10, wherein said tuning elements (A 1 . . . A 4 ) are formed as tuning screws whose longitudinal axis are perpendicularly to the plane of said spiral resonators (SpR 1 . . . SpR 4 ) and said screws extend toward the centers of said spiral resonators.
Claim 14
Dependent Claim
22 words
A filter according to claim 9 wherein the shape of said spiral resonators (SpR 1 ) deviate from a constant pitch spiral.
Claim 15
Dependent Claim
14 words
A filter according to claim 12 wherein said spiral resonators (SpR) are rectangularly shaped.
Claim 16
Dependent Claim
19 words
A filter according to claim 9 wherein the conductor cross-section of said spiral resonators (SpR) change steadily or discontinuously.
Claim 17
Dependent Claim
34 words
A filter according to claim 9 wherein said spiral resonators (SpR 1 . . . SpR 4 ) are mounted such that the planes formed by the spiral resonators lie in the same plane.
Claim 18
Dependent Claim
34 words
A filter according to claim 9 wherein said spiral resonators (SpR 1 . . . SpR 5 ) are mounted such that the planes formed by said spiral resonators are parallel to each other.
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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) | 1991-07-12 | 1992-01-11 | 1992-07-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-07-12 | 1996-01-11 | 1996-07-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-07-12 | 2000-01-11 | 2000-07-12 | $7700.00 | Window Closed / Lapsed |