Band-Selective Isolation Bridge for Splitter Port Isolation
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Solution Overview
Problem
Conventional coaxial splitters in data distribution networks, such as CATV systems, face challenges in allowing home network signals to pass through while maintaining isolation from provider bandwidth signals, which is necessary for efficient data distribution and interference reduction.
Innovation Solution
A splitter device with a band-selective isolation bridge circuit that attenuates provider bandwidth and allows home network bandwidth to pass between user ports, using high and low pass filters to ensure isolation and minimize interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional coaxial splitters are used to distribute provider bandwidth signals, then signal distribution to multiple outlets is achieved, but isolation between output ports is insufficient allowing home network signals to interfere with CATV reception
Solution Approach 1:
The splitter is divided into multiple functional sections: a first splitter for distributing provider bandwidth signals, a second splitter for receiving home network signals, and a band-selective isolation bridge circuit connecting them. This segmentation allows each section to perform its specific function while maintaining overall system isolation requirements.
Solution Approach 2:
A band-selective isolation bridge circuit is introduced as an intermediary component between the first and second splitters. This bridge circuit selectively isolates provider bandwidth signals while allowing home network bandwidth signals to pass through, thereby achieving the required isolation without completely blocking data transmission.
2Reliability
If isolation between output ports is increased to reduce interference, then CATV reception quality improves, but home network data transmission capability deteriorates
Solution Approach 1:
The band-selective isolation bridge circuit changes the isolation parameter based on frequency bands. It provides high isolation for provider bandwidth frequencies (50-1000 MHz) to reduce interference, while providing low isolation for home network bandwidth frequencies (1125-1525 MHz) to enable data transmission. This parameter change resolves the contradiction by making isolation frequency-dependent rather than constant.
Solution Approach 2:
Different parts of the signal spectrum are treated differently by the isolation bridge circuit. The circuit applies selective isolation characteristics to different frequency ranges, providing strong isolation for CATV signals while maintaining signal passage for home network data, thereby achieving both interference reduction and data transmission capability simultaneously.
3Reliability
If a band-selective isolation bridge circuit is added to achieve frequency-selective isolation, then both provider and home network bandwidths are properly managed, but device complexity increases
Solution Approach 1:
The band-selective isolation bridge circuit performs multiple functions simultaneously: it isolates provider bandwidth signals, allows home network bandwidth signals to pass, and maintains impedance matching across different frequency bands. By combining these functions in a single component, the overall device complexity is minimized while achieving the desired frequency-selective isolation.
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 isolates provider bandwidth from home network bandwidth, enabling seamless data transmission within the home network while preventing interference, thus enhancing the performance of data distribution systems.
Implementation Method 1
A low pass filter is configured to attenuate the home network bandwidth and pass the provider bandwidth
Implementation Method 2
A high pass filter is configured to attenuate the provider bandwidth and pass the home network bandwidth
Implementation Method 3
The bridge circuit is configured to isolate the provider bandwidth from the home network bandwidth
Data Source
AI summary
A splitter device includes a first splitter comprising an input leg coupled to a provider content input port, a first output leg, and a second output leg. The provider content input port is configured to receive a downstream-propagating provider bandwidth. The splitter device further includes a first conductive path coupled to the first output leg of the first splitter, and a second conductive path coupled to the second output leg of the first splitter. The splitter device further includes a second splitter having an input leg coupled to a first home network bandwidth, a first output leg coupled to the first conductive path, and a second output leg. The splitter device further includes a third splitter having an input leg coupled to a second home network bandwidth, a first output leg coupled to the second conductive path, and a second output leg. The splitter device further includes a bridge circuit operatively coupled between the first conductive path and the second conductive path. The bridge circuit is configured to propagate a home network bandwidth from the first user port to the second user port and isolate the provider bandwidth from the home network bandwidth.