# US 5,351,018 A · Antenna isolation assembly for hot chassis receiver

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- Number: US 5,351,018 A
- Document ID: US5351018A
- Status: Granted
- Kind: A
- Application number: 07/982,286
- Filed: 1992-11-25
- Granted: 1994-09-27
- Earliest claimed: 1992-11-25
- Assignees: Thomson Consumer Electronics, Inc.
- Inventors: William L. Lehmann; William H. Bose
- Web page: https://patentgrep.com/patent/US5351018A

## CPC

- H01Q 1/526: {Electromagnetic shields}
- H04B 1/18: Input circuits, e.g. for coupling to an antenna or a transmission line (coupling networks between antennas or lines and receivers independent of the nature of the receiver H03H)
- H01Q: ANTENNAS, i.e. RADIO AERIALS (radiators or antennas for microwave heating H05B6/72)
- H04B: TRANSMISSION

## Abstract

A television receiver powered by an alternating current power source includes an electrically conductive chassis coupled to one side of the AC source, a radio frequency tuner coupled to the chassis, and a coaxial cable having an inner conductor and an outer shielding conductor for supplying filtered radio frequency signals to the tuner. The outer conductor is comprised of an electrically conductive housing circumposing the inner conductor for at least a portion of its longitudinal length, and providing electrical connection and mechanical support for the cable assembly. Filtering of the signal is provided by one or more ferrite beads disposed about the outer conductor, and capristor/capacitor devices.

## Claims

### Claim 1

An RF receiver including a radio frequency tuner coupled to a radio frequency signal source by a coaxial cable having inner and outer conductors, said coaxial cable comprising:
an inner conductor having longitudinal length,
an electrical insulation means having longitudinal length and circumposed about the inner conductor over a portion of its longitudinal length, and
an outer conductor having longitudinal length and circumposed about the electrical insulation means over a portion of its longitudinal length for shielding the inner conductor, said outer conductor being made from electrically conductive sheet metal and a portion of the outer conductor enclosing a portion of the outer perimeter of the electrical insulation means in a close fitting friction fit, said outer conductor having unitary legs for mounting to a support means and electrically coupling the outer conductor to a reference potential.

### Claim 2 (depends on 1)

The coaxial cable of claim 1 wherein said cable has a characteristic impedance of 75 ohms.

### Claim 3 (depends on 1)

The coaxial cable of claim 1 further comprising a ferrite bead circumposed about a portion of the longitudinal length.

### Claim 4

A coaxial cable comprising:
an inner conductor having longitudinal length,
an electrical insulation means having longitudinal length and circumposed about the inner conductor over a portion of its longitudinal length, and
an outer conductor having longitudinal length and circumposed about the electrical insulation means over a portion of its longitudinal length for shielding the inner conductor, said outer conductor being made from electrically conductive sheet metal and a portion of the outer conductor enclosing the outer perimeter of the electrical insulation means in a close fitting friction fit, said outer conductor having unitary legs for mounting to a support means and electrically coupling the outer conductor to a reference potential.

### Claim 5 (depends on 4)

The coaxial cable of claim 4 wherein said cable has a characteristic impedance of 75 ohms.

### Claim 6 (depends on 4)

The coaxial cable of claim 4 further comprising a ferrite bead circumposed about a portion of the longitudinal length.