US3863024A
Expired / Lapsed
US
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Directional coupled data transmission system
Assignee: International Business Machines Corp
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Filing: 1973-12-26
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Granted: 1975-01-28
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Expires: 1993-12-26
Abstract
Abstract A combination is provided of a directional coupler connected in a transmission line of a data transmission system and an encoding means for generating the data bits of information which, when coupled through the directional coupling means, produces a coupled signal having a substantially fixed width regardless of the length of the transmission line traversed and a height which diminishes comparatively slowly with the transmission line length traversed. The directional coupling means has a coupling coefficient of at least 0.5 and has an electrical length which is substantially equivalent to one quarter of a bit length of the encoded information. The encoding means for the data bits of information generate at least one of the encoded bits identified by a full cycle signal having an equal positive and negative excursion.
Inventors
- 👤 Edward S Caragliano
- 👤 Howard H Nick
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 19:37
CPC Classifications
H; H04; H04L; H04L25/00; H04L25/02; H04L25/03; H04L25/03006; H04L25/03012; H04L25/03114; H04L25/03127
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
139 words
In a data transmission system having a transmitter and receiver connected through a transmission line for conveying encoded data bits of information the combination of: directional coupling means located in said transmission line and an encoding means for generating the data bits of information which when coupled through said directional coupling means produces a coupled signal having a substantially fixed width regardless of the length of transmission line traversed and a height which diminishes comparatively slowly with transmission line length traversed; said directional coupling means having a coupling coefficient of at least 0.5 and having an electrical length which is substantially equivalent to one quarter of a bit length; said encoding means for the data bits of information generating at least one of the encoded bits identified by a full cycle signal having an equal positive and negative excursion.
Claim 2
Dependent Claim
139 words
In a data transmission system having a transmitter and receiver connected through a transmission line for conveying encoded data bits of information the combination of: directional coupling means located in said transmission line and an encoding means for generating the data bits of information which when coupled through said directional coupling means produces a coupled signal having a substantially fixed width regardless of the length of transmission line traversed and a height which diminishes comparatively slowly with transmission line length traversed; said directional coupling means having a coupling coefficient of at least 0.5 and having an electrical length which is substantially equivalent to one quarter of a bit length; said encoding means for the data bits of information generating at least one of the encoded bits identified by a full cycle signal having an equal positive and negative excursion.
Claim 3
Dependent Claim
137 words
In a data transmission system according to claim 1, wherein said directional coupler means connected in said transmission line comprises: a first coupling segment connected at one end thereof to a first length of said transmission line and terminated at the other end thereof in a resistance equal to the charaCteristic impedance of transmission line; a second coupling segment connected at one end thereof to a second length of said transmission line and terminated at the other end thereof in a resistance equal to the characteristic impedance of said transmission line; said first and second coupling segments being coextensive with said terminated ends adjacent one another and located between ground planes and at a distance from one another to give the desired coupling from the first coupling segment to the second coupling segment in a backward direction.
Claim 4
Dependent Claim
25 words
In a data transmission system according to claim 1, wherein said transmission line for conveying encoded data represented by bits of information is a cable.
Claim 5
Dependent Claim
80 words
In a data transmission system according to claim 1, wherein said encoding means is represented by two bits of information, each extending for a full cycle having an equal positive and negative excursion in a non-return to zero form, one bit consisting of a positive signal for a half cycle followed by a negative signal for a half cycle, the other bit consisting of a negative signal for a half cycle followed by a positive signal for a half cycle.
Claim 6
Dependent Claim
65 words
In a data transmission system according to claim 1, wherein said encoding means is represented by two bits of information, each extending for a full cycle in a return to zero form; one bit consisting of a sinusoidal waveform starting with a positive half cycle followed by a negative half cycle, the other bit consisting of the absence of a signal for a full cycle.
Claim 7
Dependent Claim
71 words
In a data transmission system according to claim 1, wherein said encoding means is represented by two bits of information, each extending for a full cycle in a return to zero form, one bit consisting of a sinusoidal waveform starting with a positive half cycle followed by a negative half cycle, the other bit consisting of a sinusoidal waveform starting with a negative half cycle followed by a positive half cycle.
Claim 8
Dependent Claim
38 words
In a data transmission system according to claim 1, wherein said directional coupling means is a strip line directional coupler consisting of printed circuit first and second coupling segments separated by a material having a high dielectric constant.
Claim 9
Dependent Claim
39 words
In a data transmission system according to claim 2, wherein said first coupling segment and said second coupling segment are of the same length, width, and thickness and are located equally distant from one another along the width dimension.
Claim 10
Dependent Claim
33 words
In a data transmission system according to claim 7, wherein said strip line directional coupler is located between and separated from thin copper sheets forming ground planes therewith by high dielectric constant material.
Claim 11
Dependent Claim
174 words
In a data transmission system according to claim 1, wherein said directional coupler means comprises a first and second directional coupler, each having a first and second coupling segment, the input end of said first coupling segment of said first directional coupler is connected to the transmission line connected to the transmitter so as to receive said encoded data bits of information, the other end of said first coupling segment of said first coupler is connected to the input end of the first coupling segment of said second coupler, the output end of said first coupling segment of said second coupler having a resistor connected thereto to ground providing an impedance equal to the characteristic impedance of the transmission line; the second coupling segment of said first coupler has the output end connected to the input end of the second coupling segment of said second coupler; and said output end of said second coupling segment of said second coupler is connected to the transmission line connected to the transmission line connected to the receiver.
Claim 12
Dependent Claim
141 words
In a data transmission system according to claim 1, wherein said directional coupler means comprises a plurality of directional couplers, each having a first and second coupling segment; said first coupling segments of said pLurality of directional couplers are connected in series to the end of said transmission line connected to the transmitter; said second coupling segments of said plurality of directional couplers are connected in series but each having the input and output thereof reversed with respect to said first coupling segments so that the signal coupled from said first coupling segments travels in the opposite direction in said second coupling segments; the output from the last second coupling segment of said plurality of directional couplers is connected to the transmission line connected to the receiver, the coupled signal being enhanced in amplitude by each of said plurality of couplers.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-01-27 | 1978-07-29 | 1979-01-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-01-27 | 1982-07-29 | 1983-01-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-01-27 | 1986-07-29 | 1987-01-28 | $7700.00 | Window Closed / Lapsed |