US3792382A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Filter for electrical oscillations
Assignee: Siemens AG
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Filing: 1973-03-19
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Granted: 1974-02-12
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Expires: 1993-03-19
Abstract
Abstract A filter for electric oscillations comprises n resonators, where n 4, which are coupled by line elements and have line characteristics. The filter has an input impedance which tends to zero on at least one side of the pass band, and also has a maximum at a given frequency, the echo attenuation in the pass band having more than one maximum. At least two of the echo attenuation poles occur at non-physical frequencies (po + OR sigma + j omega ). The absolute value of the real part ( sigma ) of the poles amounts to at least the nth part of the 3dB bandwidth of the filter.
Inventors
- 👤 A Guenther
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 22:58
CPC Classifications
H; H03; H03H; H03H9/00; H03H9/46; H03H9/48; H03H9/50
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
127 words
A filter for electric oscillations comprising a plurality of resonators which have line characteristics, line elements coupling said resonators, said filter having input impedance which tends towards zero at least on one side of its pass band, and on this side has an input impedance maximum at a given frequency, and the echo attenuation of the filter possessing more than one maximum in the pass band, wherein said filter comprises n resonators, where n 4 at least two echo attenuation poles occurring at non-physical frequencies (po + OR - o + j o) and the absolute value of the real part ( sigma ) of this complex echo attenuation pole positioning amounts to at least the nth part of the 3 dB bandwidth Bo of the filter.
Claim 2
Dependent Claim
127 words
A filter for electric oscillations comprising a plurality of resonators which have line characteristics, line elements coupling said resonators, said filter having input impedance which tends towards zero at least on one side of its pass band, and on this side has an input impedance maximum at a given frequency, and the echo attenuation of the filter possessing more than one maximum in the pass band, wherein said filter comprises n resonators, where n 4 at least two echo attenuation poles occurring at non-physical frequencies (po + OR - o + j o) and the absolute value of the real part ( sigma ) of this complex echo attenuation pole positioning amounts to at least the nth part of the 3 dB bandwidth Bo of the filter.
Claim 3
Dependent Claim
18 words
A filter as claimed in claim 1, wherein the bandwidth of the filter is greater than 2 kHz.
Claim 4
Dependent Claim
40 words
A filter as claimed in claim 1, wherein the attenuation characteristic is not steepened by finite attenuation poles and the bandwidth B1 of its end circuits satisfies the equation B1 > or = 0.366 (1- w)/(1+ w). nBo, where e
Claim 5
Dependent Claim
20 words
A filter as claimed in claim 1, wherein said resonators are mechanical resonators which are mechanically coupled to one another.
Claim 6
Dependent Claim
39 words
A filter as claimed in claim 1, wherein there is provided a reactance bridge from the first to the last resonator and the bandwidth B1 of its end circuits satisfies the equation B1 > or = 0.366 (1-w)/(1+w). nBo.
Claim 7
Dependent Claim
20 words
A filter as claimed in claim 5, wherein said resonators are mechanical resonators which are mechanically coupled to one another.
Claim 8
Dependent Claim
15 words
A filter as claimed in claim 6, wherein the reactance bridge is a mechanical line.
Claim 9
Dependent Claim
16 words
A filter as claimed in claim 6, wherein the reactance bridge is a concentrated circuit element.
Claim 10
Dependent Claim
24 words
A filter as claimed in claim 1, wherein at least one of the end resonators is a resonant circuit consisting of concentrated circuit elements.
Claim 11
Dependent Claim
28 words
A filter as claimed in claim 9, wherein said resonators are arranged symmetrically and wherein the two electric end circuits are made up of elements having different dimensions.
Claim 12
Dependent Claim
30 words
A filter as claimed in claim 1, wherein said resonators are in the form of bending mode oscillators and the coupling elements are in the form of longitudinal mode couplers.
References Cited (Backward Citations)
DE1541975A1
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-02-11 | 1977-08-13 | 1978-02-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-02-11 | 1981-08-13 | 1982-02-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-02-11 | 1985-08-13 | 1986-02-12 | $7700.00 | Window Closed / Lapsed |