MoCA Splitter Circuit With Controlled Port Isolation
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Solution Overview
Problem
Conventional Wilkinson and ferrite-based splitters suffer from excessive isolation levels and non-uniform isolation between output ports, leading to noise and inconsistent network reliability, as well as high insertion loss, which degrades signal quality.
Innovation Solution
A micro-strip MoCA splitter device with a multi-stage Wilkinson circuit configuration, utilizing resistors, capacitors, and inductors as isolation elements to provide a uniform isolation level of less than 16 dB and insertion loss of less than 4 dB per cascaded splitter in the MoCA frequency band, optimizing thermal behavior and signal integrity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional Wilkinson or ferrite-based splitters are used, then isolation between output ports is achieved, but the isolation level becomes excessive and non-uniform, leading to noise and inconsistent network reliability
Solution Approach 1:
The patent changes the isolation parameter from excessive (conventional) to controlled (less than 16 dB) by modifying the splitter circuit design. This involves adjusting the isolation elements and transmission line characteristics to achieve a specific isolation parameter range that eliminates noise while maintaining network reliability.
Solution Approach 2:
The patent applies different isolation characteristics to different output ports to achieve uniform isolation levels. By localizing quality adjustments in the isolation elements connected to each transmission line, the system achieves consistent isolation performance across all ports, resolving the non-uniform isolation problem.
2Reliability
If conventional ferrite-based or resistive splitters are used, then splitting function is achieved, but insertion loss becomes high, resulting in signal degradation at output ports
Solution Approach 1:
The patent changes the insertion loss parameter from high (conventional ferrite or resistive splitters) to low (less than 4 dB per cascaded splitter) by selecting specific component values and configurations. This involves optimizing the transmission line characteristics and isolation element parameters to minimize energy loss while maintaining the splitting function.
Data Source
AI summary
A MoCA splitter device may include an input port, a first output port and a second output port, a first transmission line configured to connect the input port to the first output port, a second transmission line configured to connect the input port to the first output port, a first isolation element configured to connect the first transmission line to the second transmission line, a second isolation element configured to connecting the first transmission line to the second transmission line. The first isolation element and the second isolation element are configured to provide an isolation level between the first output port and the second output port that is less than a predetermined isolation level of about less than 16 dB in a MoCA frequency band.