MoCA Filter Circuit With Multipath Reflection Mitigation
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Solution Overview
Problem
Existing MoCA filters suffer from multipath interference, which causes signal distortion due to high transmission energy and reflections at device ports, leading to 'ghosting' in MoCA networks.
Innovation Solution
A filter circuit with a multipath interference mitigation leg that includes an absorptive Chebyshev filter circuit or a Tee-type resistive attenuator, branched in parallel with the pass band filter, to increase return loss and reduce reflections, characterized by an insertion loss of less than 3 dB in the provider bandwidth and more than 20 dB in the home network bandwidth.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If high transmission energy is used in MoCA networks, then data transmission rate is improved, but multipath interference and signal distortion increase
Solution Approach 1:
The patent converts the harmful multipath reflections into beneficial effects by using absorptive materials and resistive attenuators that dissipate the reflected energy, transforming the harmful interference into controlled energy absorption that prevents ghosting and signal distortion while maintaining high transmission rates
2Reliability
If reflections are reduced at device ports, then signal quality is improved, but return loss must be increased
Solution Approach 1:
The patent introduces intermediary components (absorptive Chebyshev filter circuits and Tee-type resistive attenuators) between the signal path and the reflections, which mediate the energy by absorbing and dissipating it as heat, thereby reducing reflections without directly blocking the signal path and maintaining signal quality
3Productivity
If a pass band filter is used to attenuate home network bandwidth, then provider bandwidth transmission is maintained, but multipath distortions persist
Solution Approach 1:
The patent merges the pass band filter with additional multipath mitigation circuits (absorptive Chebyshev filter and Tee-type resistive attenuator) to create a hybrid circuit that simultaneously maintains provider bandwidth transmission and eliminates multipath distortions by combining frequency selection with energy absorption functions
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution effectively minimizes or eliminates home network multipath distortions, enhancing signal quality by reducing reflections and power loss, thereby improving the performance of MoCA networks.
Implementation Method 1
A filter circuit with a multipath interference mitigation leg that includes an absorptive Chebyshev filter circuit
Implementation Method 2
A filter circuit with a multipath interference mitigation leg that includes an absorptive Chebyshev filter circuit or a Tee-type resistive attenuator
Implementation Method 3
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
Data Source
AI summary
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.