Patent US3723918A successfully refreshed from Google Patents.
US3723918A
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Separating filter network active as a quartz band-stop filter
Assignee: Siemens AG
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Filing: 1970-09-18
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Granted: 1973-03-27
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Expires: 1990-09-18
Abstract
Abstract A network consisting of an all-pass circuit which consists of two equal frequency separating networks whose partial filters have even characteristic functions reciprocal to one another of the degree 2n (n 1, 2, 3 . . . ) and in which between each two equal partial filters there are connected four-pole circuits which are dimensioned in such a way that the electrical properties of the entire network, except for one additional phase, agree with the prescribed electrical properties of the interposed four-pole circuits. The interposed four-pole circuits are constructed with respect to their transmission properties as equal all-pass or low-pass sections of which the one lying in the band-pass or low-pass path, is rendered a band stop circuit by quartz elements.
Inventors
- 👤 H Krause
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 14:04
CPC Classifications
H; H03; H03H; H03H7/00; H03H7/18; H03H7/19; H03H7/01; H03H7/0115; H03H7/17; H03H7/1741; H03H7/175; H03H7/1758; H03H7/1766; H03H7/1775; H03H7/1791; H03H9/00; H03H9/0023; H03H9/0095; H03H9/46; H03H9/54; H03H9/542; H04; H04J; H04J1/00; H04J1/02; H04J1/04; H04J1/045; H04J1/08; H03H2007/013; H03H7/075
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
199 words
In a separating filter network forming an all-pass circuit by connecting two similar separating filters (11, 12; 11'', 12'') in a mirror-image arrangement, said separating filters having filter circuits (11, 12, 11'', 12'') which have even characteristic functions, reciprocal to one another, of the degree 2n (n 1, 2, 3 . . . ), the improvement therein comprising between each two similar filter circuits (11, 11''; 12, 12'') respective two-port circuits (VP1, VP2) are connected having different transmission characteristics in the pass-bands of said filter circuits (11, 11''; 12, 12''), said two-port circuits (VP1, VP2) dimensioned in such a way that the transmission characteristics of the entire network (1, 10) agree with the transmission characteristics of the interposed two-port circuits (VP1, VP2) in the pass-bands of the respective filter circuits (11, 11''; 12, 12''), except for an additional phase, wherein said filter circuits (11, 11'', 12, 12'') are band-pass (11, 11'') and band-stop (12, 12'') filters respectively, and wherein said two-port circuits (VP1, VP2) with respect to their transmission characteristics are constructed as similar all pass-filters, of which the all pass-filter (VP1) connected in the band-pass branch (11, 11'') include quartz elements (Q1, Q2) to form a band-stop filter.
Claim 2
Dependent Claim
199 words
In a separating filter network forming an all-pass circuit by connecting two similar separating filters (11, 12; 11'', 12'') in a mirror-image arrangement, said separating filters having filter circuits (11, 12, 11'', 12'') which have even characteristic functions, reciprocal to one another, of the degree 2n (n 1, 2, 3 . . . ), the improvement therein comprising between each two similar filter circuits (11, 11''; 12, 12'') respective two-port circuits (VP1, VP2) are connected having different transmission characteristics in the pass-bands of said filter circuits (11, 11''; 12, 12''), said two-port circuits (VP1, VP2) dimensioned in such a way that the transmission characteristics of the entire network (1, 10) agree with the transmission characteristics of the interposed two-port circuits (VP1, VP2) in the pass-bands of the respective filter circuits (11, 11''; 12, 12''), except for an additional phase, wherein said filter circuits (11, 11'', 12, 12'') are band-pass (11, 11'') and band-stop (12, 12'') filters respectively, and wherein said two-port circuits (VP1, VP2) with respect to their transmission characteristics are constructed as similar all pass-filters, of which the all pass-filter (VP1) connected in the band-pass branch (11, 11'') include quartz elements (Q1, Q2) to form a band-stop filter.
Claim 3
Dependent Claim
91 words
A network according to claim 1, wherein said bandpass branch (11, 11'') includes transverse parallel resonant circuits (L''2, C''''2) and wherein in the band-pass branch two quartz elements (Q3, Q4) are connected in parallel to said transverse parallel resonant circuits (L''2, C''''2) and wherein these quartz elements (Q3, Q4) are decoupled by said interconnected two-port circuit (VP1) which is dimensioned to provide a phase shift of (2n - 1) pi /2 at the series resonant frequency of the quartz elements (Q3, Q4) where n 1, 2, 3 . . . .
Claim 4
Dependent Claim
19 words
A network according to claim 1, comprising in the band-stop branch (12, 12'') a resistor attenuation section (R1, R2).
Claim 5
Dependent Claim
196 words
In a separating filter network forming an all-pass circuit by connecting two similar separating filters (11, 12; 11'', 12'') in a mirror-image arrangement, said separating filters having filter circuits (11, 12, 11'', 12'') which have even characteristic functions, reciprocal to one another, of the degree 2n (n 1, 2, 3 . . . ), the improvement therein comprising between each two similar filter circuits (11, 11'', 12, 12'') respective reactance two-port circuits (VP1, VP2) are connected having identical transmission characteristics, so that the transmission characteristics of the entire network (1, 10) agree with the transmission characteristics of one of the interposed reactance two-port circuits, except for an additional phase, wherein said filter circuits (11, 11'', 12, 12'') are band-pass (11, 11'') and band-stop (12, 12'') filters respectively, and wherein the band-pass branch (11, 11'') includes transverse parallel resonant circuits (L''2, C''2) and quartz elements (Q3, Q4) connected in parallel to said transverse parallel resonant circuits (L''2, C''2), said quartz elements (Q3, Q4) being decoupled by said reactance-two-port circuit which provides a phase shift of (2n -1) pi /2 at the series resonant frequencies of said quartz elements, where n 1, 2, 3 . . . .
Claim 6
Dependent Claim
196 words
In a separating filter network forming an all-pass circuit by connecting two similar separating filters (11, 12; 11'', 12'') in a mirror-image arrangement, said separating filters having filter circuits (11, 12, 11'', 12'') which have even characteristic functions, reciprocal to one another, of the degree 2n (n 1, 2, 3 . . . ), the improvement therein comprising between each two similar filter circuits (11, 11'', 12, 12'') respective reactance two-port circuits (VP1, VP2) are connected having identical transmission characteristics, so that the transmission characteristics of the entire network (1, 10) agree with the transmission characteristics of one of the interposed reactance two-port circuits, except for an additional phase, wherein said filter circuits (11, 11'', 12, 12'') are band-pass (11, 11'') and band-stop (12, 12'') filters respectively, and wherein the band-pass branch (11, 11'') includes transverse parallel resonant circuits (L''2, C''2) and quartz elements (Q3, Q4) connected in parallel to said transverse parallel resonant circuits (L''2, C''2), said quartz elements (Q3, Q4) being decoupled by said reactance-two-port circuit which provides a phase shift of (2n -1) pi /2 at the series resonant frequencies of said quartz elements, where n 1, 2, 3 . . . .
Claim 7
Dependent Claim
19 words
A network according to claim 4, comprising in the band-stop branch (12, 12'') a resistor attenuation section (R1, R2).
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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) | 1976-03-26 | 1976-09-25 | 1977-03-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-03-26 | 1980-09-25 | 1981-03-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-03-26 | 1984-09-25 | 1985-03-27 | $7700.00 | Window Closed / Lapsed |