US3694775A
Expired / Lapsed
US
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Matrix switching system having iteratively terminated transmission line
Assignee: General Dynamics Corp
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Filing: 1971-03-29
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Granted: 1972-09-26
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Expires: 1991-03-29
Abstract
Abstract An iteratively terminated or ''''tapered'''' transmission line is disclosed which is suitable for high frequency matrix switch application. The transmission lines interconnecting successive terminating impedances each have a characteristic impedance equal to the impedance in which it is effectively terminated. This arrangement allows the terminating impedances to be irregularly spaced along the tapered line and prevents signal reflections from occurring at any termination point, improving the stability of response when frequency changes and when either the number or the configuration of crosspoint closures changes.
Inventors
- 👤 Stanley Rogers
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 04:10
CPC Classifications
H; H03; H03K; H03K19/00; H03K19/02; H03K19/173; H04; H04B; H04B3/00; H04B3/02; H04B3/40; H04Q; H04Q3/00; H04Q3/0008; H04Q3/0012
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
150 words
A wide-band high-frequency matrix switch comprising a plurality of input buses, each having a characteristic impedance at the signal input point of ''''R''''; a plurality of output buses adjacent to said input buses; and a plurality of crosspoint switches including ''''n'''' crosspoint switches between the signal input to an input bus and the end of the input bus, each of which is effectively movable between a first position connecting an input bus to an output bus and a second position connecting the input bus to a dummy load the impedance of which is ''''nR'''', said dummy load having an impedance substantially equal to the impedance of the output bus; each section of the input buses between successive crosspoints constituting a transmission line having a characteristic impedance equal to ''''nR'''' divided by the serial number of the section counting from the end of the input bus toward the signal input points.
Claim 2
Dependent Claim
150 words
A wide-band high-frequency matrix switch comprising a plurality of input buses, each having a characteristic impedance at the signal input point of ''''R''''; a plurality of output buses adjacent to said input buses; and a plurality of crosspoint switches including ''''n'''' crosspoint switches between the signal input to an input bus and the end of the input bus, each of which is effectively movable between a first position connecting an input bus to an output bus and a second position connecting the input bus to a dummy load the impedance of which is ''''nR'''', said dummy load having an impedance substantially equal to the impedance of the output bus; each section of the input buses between successive crosspoints constituting a transmission line having a characteristic impedance equal to ''''nR'''' divided by the serial number of the section counting from the end of the input bus toward the signal input points.
Claim 3
Dependent Claim
21 words
The matrix switch according to claim 1 wherein each end of each output bus is terminated in an impedance of 2nR.
Claim 4
Dependent Claim
38 words
The matrix switch according to claim 1 wherein said signal input points are substantially at the center of each of said input buses, with crosspoints spaced along the input buses on both sides of the signal input point.
Claim 5
Dependent Claim
168 words
A wide-band high-frequency matrix switch comprising a plurality of input buses, a plurality of output buses adjacent to said input buses and a plurality of crosspoint switches adapted to selectively connect crosspoints spaced along said input buses to crosspoints spaced along said output buses, each of said crosspoint switches being movable between a first position connecting an input bus to an output bus and a second position connecting the input bus to a dummy load, said dummy load having an impedance nR substantially equal to the termination impedance presented by the output bus, wherein there are n crosspoints between the signal input point on an input bus and the end of the input bus, R is the characteristic impedance of the input line at the signal input point, and the characteristic impedance of each of said transmission line sections is selected to be equal to nR divided by the serial number of the section counting from the end of the input bus back toward the signal input point.
Claim 6
Dependent Claim
168 words
A wide-band high-frequency matrix switch comprising a plurality of input buses, a plurality of output buses adjacent to said input buses and a plurality of crosspoint switches adapted to selectively connect crosspoints spaced along said input buses to crosspoints spaced along said output buses, each of said crosspoint switches being movable between a first position connecting an input bus to an output bus and a second position connecting the input bus to a dummy load, said dummy load having an impedance nR substantially equal to the termination impedance presented by the output bus, wherein there are n crosspoints between the signal input point on an input bus and the end of the input bus, R is the characteristic impedance of the input line at the signal input point, and the characteristic impedance of each of said transmission line sections is selected to be equal to nR divided by the serial number of the section counting from the end of the input bus back toward the signal input point.
Claim 7
Dependent Claim
21 words
The matrix switch according to claim 4 wherein each end of each output bus is terminated in an impedance of 2nR.
Claim 8
Dependent Claim
38 words
The matrix switch according to claim 4 wherein said signal input points are substantially at the center of each of said input buses, with crosspoints spaced along the input buses on both sides of the signal input point.
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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) | 1975-09-26 | 1976-03-27 | 1976-09-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-09-26 | 1980-03-27 | 1980-09-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-09-26 | 1984-03-27 | 1984-09-26 | $7700.00 | Window Closed / Lapsed |