Line isolation and interference shielding for a shielded conductor system

A method of isolating the shield of a shielded conductor system from a low frequency power source to which the shield may be coupled, and for shielding the field within the conductor system from ambient high frequency electromagnetic interference, comprising:

• providing an interruption in the shield;
• and
• situating within the interruption a series of dielectric elements separated by abutting magnetically absorptive material to create a capacitive coupling across the interruption to isolate the shield and magnetic absorption within the interruption to absorb energy associated with the ambient electromagnetic interference.

A method of providing A.C. line isolation between a shielded conductor system and a television tuner input adapted to receive television signals from the conductor system, and for shielding the desired high frequency field within the conductor system from ambient electromagnetic interference, comprising:

• providing an interruption between an outer shield associated with the conductor system, and an outer conductor associated with the tuner input;
• and
• disposing within the interruption a series of dielectric elements separated by abutting magnetically absorptive material to create a capacitive coupling across the interruption to isolate the shield and magnetic absorption within the interruption to absorb energy associated with the ambient electromagnetic interference.

A method of providing A.C. line isolation in a path coupling the shield of a shielded conductor to a conductor associated with the input of a television tuner, and for shielding the desired field within the shielded conductor from ambient electromagnetic interference, comprising:

• providing an interruption in the path of coupling between the conductor associated with the tuner input and the shield;
• and
• filling the interruption with dielectric and magnetically absorptive material so as to create a first capacitance which decouples the path at A.C. line frequencies and shunts a substantial portion of electromagnetic interference induced in the outer skin of the shield, a region of magnetic absorption for absorbing residual electromagnetic interference not shunted by said first capacitance, and a second capacitance to provide additional A.C. decoupling of said path and to couple the signal within the shielded conductor to the tuner input and away from the region of magnetic absorption.

In a system employing a shielded conductor which carries a desired high frequency signal, and whose shield is adpated to be coupled to a low frequency power source, an isolator for isolating the conductor's shield from the low frequency power source and for shielding the desired field within the conductor from ambient high frequency electromagnetic interference, comprising:

• means defining an interruption in the shield;
• and
• magnetically absorptive material and dielectric material situated within the interruption such that said materials are closely adjacent each other, said materials being selected and disposed to create a capacitive coupling across the interruption to isolate the shield and magnetic absorption within the interruption to absorb energy associated with the ambient electromagnetic interference.

In a system employing a shielded conductor which carries a desired high frequency signal, and whose shield is adapted to be coupled to a low frequency power source, an isolator for isolating the conductor's shield from the low frequency power source and for shielding the desired field within the conductor from ambient high frequency electromagnetic interference, comprising:

• means defining an interruption in the shield;
• and
• a series of dielectric elements separated by magnetically absorptive material filling said interruption to create a capacitive coupling across the interruption to isolate the shield and magnetic absorption within the interruption to absorb energy associated with the ambient electromagnetic interference.

In a television receiver having a tuner connected via a coupling path to at least the shield of a shielded conductor for receipt of a television signal carried by the conductor, an isolator for isolating the shield from A.C. line voltages which may be coupled to the tuner and for shielding the field within the conductor from ambient high frequency electromagnetic interference, comprising:

• means defining an interruption in the coupling path;
• and
• a series of dielectric elements separated by abutting magnetically absorptive material disposed in the interruption so as to create a capacitive coupling across the interruption to isolate the shield and magnetic absorption within the interruption to absorb energy associated with the ambient electromagnetic interference.

In a television receiver having a tuner receiving an RF signal carried by a shielded conductor, an isolator for isolating the conductor's shielded from A.C. line voltages which may be coupled to the tuner and for shielding the field within the shielded conductor from ambient high frequency electromagnetic interference, comprising:

• shield means connected to the tuner and having a diameter which is larger than the diameter of the conductor's shield, said shield means being disposed to coaxially overlap the shielded conductor;
• and
• a pair of dielectric elements and a ferrite element disposed within said axial overlap, all said elements being disposed in abutting relationship with each other and aligned coaxially within the overlap.

In a system employing a shielded conductor which carries a desired high frequency signal and whose shield may be coupled to a low frequency power source, an isolator for isolating the conductor's shield from the low frequency power source and for shielding the desired field within the conductor from ambient high frequency electromagnetic interference, comprising:

• means defining an interruption in the shield;
• and
• magnetically absorptive material and at least one resonator situated within the interruption.

For a television receiver having a tuner connected via a coupling path to at least the shield of a shielded conductor for receipt of a television signal carried by the conductor, the improvement comprising:

• means defining an interruption in the coupling path;
• and
• a series of dielectric elements separated by abutting magnetically absorptive material disposed in the interruption so as to create a capacitive coupling across the interruption and magnetic absorption within the interruption.