Signal Splitter Filter Topology for Frequency-Selective 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 inconsistent network reliability and high insertion loss.
Innovation Solution
A multi-level signal distribution device with a splitter portion and filter portions, including capacitive and high pass filters, providing enhanced isolation levels at different frequency bands and improved insertion loss by using capacitors and inductors to manage signal distribution across multiple output ports.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional Wilkinson splitters are used, then signal splitting function is achieved, but excessive isolation levels between output ports occur
Solution Approach 1:
The patent changes the isolation parameter across different frequency bands by introducing multiple filter portions (first, second, and third filter portions) that provide different isolation levels at different frequencies. This allows the system to achieve appropriate isolation where needed while maintaining signal integrity where not needed, resolving the contradiction of excessive isolation.
2Reliability
If conventional ferrite-based splitters are used, then signal splitting function is achieved, but non-uniform isolation levels between output ports occur
Solution Approach 1:
The patent applies local quality by providing different isolation characteristics at different locations (output ports) and different frequency bands. Each filter portion is configured to provide specific isolation characteristics for specific frequency ranges, ensuring uniform and appropriate isolation across all output ports while maintaining different isolation levels for different frequency bands.
3Productivity
If conventional resistive splitters are used, then signal splitting function is achieved, but high insertion loss occurs
Solution Approach 1:
The patent changes the frequency-dependent parameters of the filter portions to achieve low insertion loss in the passband while providing high isolation in the stopband. The first, second, and third filter portions are designed with specific frequency characteristics that minimize energy loss during signal transmission while maintaining effective isolation where required.
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 device achieves enhanced isolation levels of greater than 60 dB at low frequencies, less than 12 dB at high frequencies, and reduced insertion loss across various frequency bands, improving signal integrity and network reliability.
Implementation Method 1
a capacitive filter portion configured to capacitively filter signals between the high pass filter portion and the splitter portion
Implementation Method 2
a high pass filter portion configured to filter signals received from the input portion
Implementation Method 3
an output filter portion configured to filter output signals output from the splitter portion to the plurality of output portions
Implementation Method 4
using capacitors and inductors to manage signal distribution across multiple output ports
Data Source
AI summary
A multi-level signal distribution device provides different enhanced isolation levels at a plurality of different frequency bands and may include an input port, a plurality of output ports, a splitter configured to be connected between the input port and the output ports and a filter. The filter is configured to provide the plurality of enhanced isolation levels between the input port and the output ports. The device is also configured to provide enhanced isolation levels between adjacent output ports and between distant output ports.