Transmission line filter

Wave transmission lines and networks – Automatically controlled systems – With control of equalizer and/or delay network

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Details

29600, 333 82B, 333 97S, H01P 114, H01P 704, H01P 120, H01P 1100

Patent

active

040042570

ABSTRACT:
A transmission line filter having two conductors with insulation therebetween. A third conductor of a length related to the wavelength of the signal being filtered is spaced from one of the conductors but electrically coupled thereto. Terminal connectors are located at each end of the filter to interconnect the filter into the regular transmission line of the system in which the filter is being used. The filter can be formed of coaxial cable and can be a single frequency filter a multiple frequency filter of a bandpass filter arrangement. In a filter trap arrangement, one end of the third conductor is conductively connected to the other of the main conductors. A method for making a coaxial embodiment of the filter is achieved by initially placing the main line inner conductor together with the third conductor within the dielectric and subsequently chopping out sections of the third conductor line to adjust its length to the wavelength of the signal being filtered and to provide electrical connection to the outer shield which is subsequently placed over the dielectric. The filter provides unique application in controlling programs sent to subscribers in cable TV systems.

REFERENCES:
patent: 2925565 (1960-02-01), Cook et al.
patent: 3138768 (1964-06-01), Evans
patent: 3414844 (1968-12-01), Putz
patent: 3416102 (1968-12-01), Hamlin
patent: 3503015 (1970-03-01), Coraccio et al.
patent: 3566020 (1971-02-01), Kinross et al.
patent: 3849743 (1974-11-01), Treczka
patent: 3896402 (1975-07-01), Jackson

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