MULTIPATH MITIGATION CIRCUIT FOR HOME NETWORK

• US 20130278353A1
• Filed: 06/14/2013
• Published: 10/24/2013
• Est. Priority Date: 02/01/2010
• Status: Active Grant

• Current Assignee: PPC Broadband Incorporated (Belden Inc.)
• Original Assignee: PPC Broadband Incorporated (Belden Inc.)
• Inventors: Alkan, Erdogan, Palinkas, Raymond W.
• Granted Patent: US 9,306,530 B2
• Time in Patent Office: Days
• US Class Current: 333/175
• CPC Class Codes: H03H 7/01 Frequency selective two-port networks
• CPC Class Codes: H03H 7/0138 Electrical filters or coupling circuits
• CPC Class Codes: H03H 7/0161 Bandpass filters H03H7/12 takes precedence
• CPC Class Codes: H03H 7/06 including resistors H03H7/075, H03H7/09, H03H7/12, H03H7/13 take precedence
• CPC Class Codes: H03H 7/1741 Comprising typical LC combinations, irrespective of presence and location of additional resistors when resistors are present, also classify in H03H7/06 - H03H7/07
• CPC Class Codes: H03H 7/1758 Series LC in shunt or branch path H03H7/1791 takes precedence
• CPC Class Codes: H03H 7/1766 Parallel LC in series path H03H7/1783 takes precedence

Abstract

A filter circuit is provided having multipath interference mitigation. The filter includes a signal path extending from an input to an output. The signal path includes a conductive path and a ground. A pass band filter is disposed along the signal path between the input and the output. The pass band filter passes a first frequency spectrum in a provider bandwidth, and attenuates a second frequency spectrum in a home network bandwidth. The filter circuit further includes a multipath interference mitigation leg operatively branched from the signal path. The multipath interference mitigation leg increases a return loss of the home network bandwidth. A frequency response of the filter circuit is characterized by an insertion loss characteristic between the input and the output being less than 3 dB in the provider bandwidth, and more than 20 dB in the home network bandwidth.

Claims

1. A filter circuit having a frequency response, the filter circuit comprising:

a signal path extending from an input to an output, the signal path comprising a conductive path and a ground;

a pass band filter portion disposed along the signal path between the input and the output, the pass band filter portion configured to pass a first frequency spectrum in a provider bandwidth and attenuate a second frequency spectrum in a home network bandwidth; and

a multipath interference mitigation leg operatively branched from the user-side port of the signal path, the multipath interference mitigation leg configured to decrease multipath distortions by improving a return loss characteristic of the home network bandwidth;

wherein the frequency response is characterized by an insertion loss characteristic between the input and the output being less than 3 decibels (dB) in the provider bandwidth and more than 20 dB in the home network bandwidth, the frequency response further characterized by a return loss characteristic at the output being more than 10 dB in the provider bandwidth and home network bandwidth.

2. The filter circuit of claim 1, wherein the frequency response is further characterized by the return loss characteristic being more than 20 dB in the home network bandwidth.

3. The filter circuit of claim 1, wherein the frequency response is further characterized by the insertion loss characteristic being more than 30 dB in the home network bandwidth.

4. The filter circuit of claim 1, wherein the multipath interference mitigation leg is terminated.

5. The filter circuit of claim 2, wherein the pass band filter portion comprises an inductor/capacitor arrangement having tank elements.

6. The filter circuit of claim 5, wherein the pass band filter portion comprises a hybrid parallel inductor/capacitor arrangement having tank elements and isolation inductors.

7. The filter circuit of claim 2, wherein the multipath interference mitigation leg comprises an absorptive portion.

8. The filter circuit of claim 7, wherein the absorptive portion comprises a Chebyshev filter circuit.

9. The filter circuit of claim 8, wherein the absorptive portion comprises a plurality of Chebyshev filter circuits.

10. The splitter device of claim 2, wherein the multipath interference mitigation leg further comprises a shunt resistor.

11. The splitter device of claim 10, wherein the provider bandwidth has a characteristic impedance of 75 ohms, and the shunt resistor has a resistance value of about 75 ohms

12. The filter circuit of claim 1, wherein the multipath interference mitigation leg is branched in parallel with the pass band filter portion.

13. The filter circuit of claim 12, wherein the pass band filter portion comprises an inductor/capacitor arrangement having tank elements.

14. The filter circuit of claim 12, wherein the multipath interference mitigation leg comprises an attenuator portion.

15. The filter circuit of claim 14, wherein the attenuator portion comprises a Tee-type resistive attenuator.

16. The filter circuit of claim 12, wherein the frequency response is further characterized by the return loss at the output and the input being more than 20 dB in the provider bandwidth and home network bandwidth.

17. The filter circuit of claim 1, wherein the provider bandwidth is provided by a provider group.

18. The filter circuit of claim 17, wherein the provider group is selected from the group consisting of a cable provider, a satellite provider, and a telecommunications provider.

19. The filter circuit of claim 18, wherein the provider bandwidth comprises a frequency range of 5 megahertz to 1002 megahertz.

20. The filter circuit of claim 1, wherein the home network bandwidth is provided by an end user.

21. The filter circuit of claim 20, wherein the home network bandwidth is selected from the group consisting of Ethernet, HomePlug, HPNA, 802.11n, and MoCA.