Increased cable television tap bandwidth utilizing existing tap housings
In general, in one aspect, the disclosure describes a resonance restricting material in communication with a bypass line of a cable television tap. The bypass line generates resonances at a defined frequency in response to RF parameters in the tap and the resonances increase insertion losses at the defined frequency and precludes bandwidth of the tap being increased above the defined frequency. The resonance restricting material may attenuate the resonances generated by the bypass line at the defined frequency (e.g., approximately 1.2 GHz) and reduce insertion losses at the defined frequency and enable the bandwidth of the tap to be increased (e.g., from 1.0 GHz to 1.5 GHz).
1. A cable television tap comprising
a housing;
connectors to receive a main transmission line;
a tap plate in communication with the connectors, wherein the tap plate includes RF circuitry to receive RF signals from the main transmission line, to provide a conduit for the RF signals to pass through the cable television tap, and to process the RF signals for communication with a customer;
a bypass line to provide an alternative conduit through the cable television tap when the tap plate is removed; and
a resonance restricting material in electromagnetic communication with the bypass line, wherein the resonance restricting material reduces resonances generated by the bypass line and reduces insertion losses in RF range and enables bandwidth for the cable television tap to be increased, wherein the resonance restricting material is disposed in electromagnetic communication with the bypass line using a non-conductive clip, and further wherein the resonance restricting material is configured to be disposed in electromagnetic communication with the bypass line while the cable television tap is powered.
2. The cable television tap of claim 1 , wherein the resonance restricting material is an EMI shielding material.
3. The cable television tap of claim 1 , wherein the resonance restricting material is a ferromagnetic material.
4. The cable television tap of claim 1 , wherein the resonance restricting material is a conductive elastomer that includes an elastomer binder and a ferromagnetic conductive filler.
5. The cable television tap of claim 4 , wherein the elastomer binder is silicone and the conductive filler is a combination of nickel (Ni) and carbon (C).
6. The cable television tap of claim 1 , wherein the non-conductive clip includes conductive contacts to electrically connect the resonance restricting material to the housing.
7. The cable television tap of claim 1 , wherein the resonance restricting material is connected to an underside of the bypass line.
8. The cable television tap of claim 1 , wherein the bypass line comprises a non-conductive material insulating a length of a conductive transmission line.
9. The cable television tap of claim 1 , wherein the resonance restricting material is in physical contact with the bypass line.
10. The cable television tap of claim 1 , wherein the electromagnetic communication comprises an electromagnetic resonance effect.
11. A cable television tap utilized in a cable television network to provide a connection point for a customer to access services provided by the cable television network, wherein the cable television tap includes a housing, connectors to secure to a main transmission line, a tap plate to process RF signals to provide for communication with the customer, and a bypass line to provide an alternative conduit through the cable television tap when the tap plate is removed, wherein the bypass line generates resonances at a defined frequency in response to RF parameters in the cable television tap and the resonances increase insertion losses at the defined frequency and precludes bandwidth of the cable television tap being increased above the defined frequency, wherein an improvement comprises
a resonance restricting material in electromagnetic communication with the bypass line, wherein the resonance restricting material attenuates the resonances generated by the bypass line at the defined frequency and reduces the insertion losses at the defined frequency and enables the bandwidth of the cable television tap to be increased without requiring the housing to be replaced, wherein the resonance restricting material is disposed in electromagnetic communication with the bypass line using a non-conductive clip, and further wherein the resonance restricting material is configured to be disposed in electromagnetic communication with the bypass line while the cable television tap is powered.
12. The cable television tap of claim 11 , wherein the resonance restricting material restricts the resonances created at approximately 1.2 GHz.
13. The cable television tap of claim 11 , wherein the resonance restricting material enables the bandwidth of the cable television tap to be increased from 1.0 GHz to 1.5 GHz.
14. The cable television tap of claim 11 , wherein the resonance restricting material is an EMI shielding material having lossy characteristics in range of the defined frequency.
15. The cable television tap of claim 11 , wherein the resonance restricting material is a conductive elastomer that includes an elastomer binder and a ferromagnetic conductive filler.
16. The cable television tap of claim 15 , wherein the elastomer binder is silicone and the conductive filler is a combination of nickel (Ni) and carbon (C).
17. The cable television tap of claim 11 , wherein the non-conductive clip includes conductive contacts to electrically connect the resonance restricting material to the housing.
18. The cable television tap of claim 11 , wherein the bypass line comprises a non-conductive material insulating a length of a conductive transmission line.
19. The cable television tap of claim 11 , wherein the resonance restricting material is in physical contact with the bypass line.
20. The cable television tap of claim 11 , wherein the electromagnetic communication comprises an electromagnetic resonance effect.
21. A method to increase bandwidth of a field-installed cable television tap that includes RF circuitry for processing RF signals from a main transmission line, the method comprising
removing a tap plate from the cable television tap;
installing, while the cable television tap is powered, a resonance restricting material in electromagnetic communication with a bypass line for the cable television tap, wherein the resonance restricting material attenuates resonances generated by the bypass line at a defined frequency and reduces the insertion losses at the defined frequency and enables the bandwidth of the cable television tap to be increased above the defined frequency, wherein installing the resonance restricting material includes installing a non-conductive clip supporting the resonance restricting material disposed in electromagnetic communication with the bypass line so the resonance restricting material is in electromagnetic communication with the bypass line, and further wherein the resonance restricting material is configured to be disposed in electromagnetic communication with the bypass line while the cable television tap is powered; and
installing the tap plate on the cable television tap, wherein the tap plate supports increased bandwidth.
22. The method of claim 21 , wherein installing the non-conductive clip includes installing a non-conductive clip having conductive tabs formed therein to provide electrical contact between the resonance restricting material and housing of the cable television tap.
23. The method of claim 21 , further comprising
installing a non-conductive shield on the cable television tap after the tap plate is removed to cover portions of the cable television tap powered to prevent inadvertent contact therewith when installing the resonance restricting material on the bypass line; and
removing the non-conductive shield from the cable television tap after the resonance restricting material is installed and prior to installing the tap plate.