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US3794936A
Expired / Lapsed
US
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Dividing filter network forming an all-pass filter circuit
Assignee: Individual
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Filing: 1972-12-11
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Granted: 1974-02-26
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Expires: 1992-12-11
Abstract
Abstract A dividing filter network wherein two port circuits, such as transformers, reactance circuits, equalizers and amplifiers, are interconnected in each branch of a mirror-image arrangement, the two-port circuits being designed and constructed in such a way that the frequency characteristics of the entire network agrees with the predetermined frequency characteristics of the interconnected two-port circuits, except for an additional phase.
Inventors
- 👤 W Poschenrieder
- 👤 E Buecherl
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 18:02
CPC Classifications
H; H04; H04J; H04J1/00; H04J1/02; H04J1/08; H03; H03H; H03H7/00; H03H7/18; H03H7/19; H04J1/04; H04J1/045; H03H7/01; H03H7/0115; H03H7/17; H03H7/1741; H03H7/1758; H03H7/1766
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
108 words
In a dividing filter network circuit arrangement forming an all-pass circuit by connecting two equal dividing filters in a mirror-image arrangement the dividing filters including subfilters which have even characteristic functions, reciprocal to one another, of the degree 2n (n 1,2,3. . . ), the improvement therein comprising between each two equal sub-filters there are interposed respective two port circuits having in general different frequency characteristics in partial frequency ranges, which two-port circuits are dimensioned in such a way that the electrical properties of the entire filter network agree with predetermined electrical properties in the partial frequency ranges of the interposed two-port circuits, except for an additional phase.
Claim 2
Dependent Claim
108 words
In a dividing filter network circuit arrangement forming an all-pass circuit by connecting two equal dividing filters in a mirror-image arrangement the dividing filters including subfilters which have even characteristic functions, reciprocal to one another, of the degree 2n (n 1,2,3. . . ), the improvement therein comprising between each two equal sub-filters there are interposed respective two port circuits having in general different frequency characteristics in partial frequency ranges, which two-port circuits are dimensioned in such a way that the electrical properties of the entire filter network agree with predetermined electrical properties in the partial frequency ranges of the interposed two-port circuits, except for an additional phase.
Claim 3
Dependent Claim
91 words
A separating filter network according to claim 1, wherein the interposed two-port circuits are active two-port circuits with different transmission frEquency bands, said active two-port circuits being dimensioned in such a way that their transmission frequency bands overlap in an overlapping range of the sub-filters and in such overlap have equal properties, and in the frequency ranges in which the transmission properties of the imposed two-port circuits are different the sub-filters respectively have a high stop band attenuation corresponding to the required accuracy of the frequency behavior of the entire circuit.
Claim 4
Dependent Claim
89 words
A filter network according to claim 1, wherein the interposed two-port circuits are passive two-port circuits with differing transmission frequency bands, said two-port circuits being dimensioned in such a way that their transmission frequency bands overlap in an overlapping range of the sub-filters and in such overlap have equal properties, and in the frequency ranges in which the transmission properties of the interposed two-port circuits are different the sub-filters respectively have a high stop band attenuation corresponding to the required accuracy of the frequency behavior of the entire circuit.
Claim 5
Dependent Claim
13 words
A filter network according to claim 1, wherein said two-port circuits are transformers.
Claim 6
Dependent Claim
14 words
A filter network according to claim 1, wherein said two-port circuits are reactance circuits.
Claim 7
Dependent Claim
15 words
A filter network according to claim 1, wherein said two-port circuits are attenuation equalizer circuits.
Claim 8
Dependent Claim
14 words
A filter network according to claim 1, wherein said two-port circuits are amplifier circuits.
References Cited (Backward Citations)
GB772217A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-02-25 | 1977-08-27 | 1978-02-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-02-25 | 1981-08-27 | 1982-02-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-02-25 | 1985-08-27 | 1986-02-26 | $7700.00 | Window Closed / Lapsed |