Automatic impedance modification of transmission lines
US4004102A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Aug 8, 1975 |
| Grant date | Jan 18, 1977 |
| Priority date | — |
| Expiry date | Aug 8, 1995 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04B3/40
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
An automatic impedance matching network for a transmission line includes an impedance monitor which provides a control signal for two variable compensators. One compensator corrects an impedance mismatch at low frequencies while the second compensates within a higher frequency range. A directional sensor completes a conductive path for the control signal to the variable compensators only for the direction of signal propagation indicative of the impedance of the transmission line being compensated. The disclosed arrangement operates automatically from the intelligence signals transmitted over the line to provide impedance compensation for a variety of cable sizes of different lengths.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.