RF Multiplexer Weakly-Coupled Resonant Circuit Stopband
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing RF multiplexers face challenges in efficiently routing RF signals across multiple paths without causing insertion losses and noise interference, as the number of paths and frequency bands increases, requiring additional filtering components to prevent interference.
Innovation Solution
The implementation of weakly coupled parallel resonant circuits in the multiplexing circuitry, which creates stopbands in one path's passband within another, reducing the need for additional filtering components and minimizing interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If additional filtering components are provided in each path to block noise and reduce insertion losses from other paths, then signal isolation and noise blocking are improved, but device complexity and the number of filtering components required increase
Solution Approach 1:
The patent merges the filtering function into the common path rather than distributing separate filters in each path. The common path filter simultaneously serves multiple paths by creating stopbands that block interference between paths, eliminating the need for individual path filters and reducing overall device complexity while maintaining signal isolation performance
Solution Approach 2:
The common path filtering circuitry performs multiple functions: it filters signals for the current path while simultaneously creating stopbands to block signals from other paths. This universal filtering approach allows a single filter structure to handle interference from multiple paths, reducing the total number of filtering components needed
2Adaptability or versatility
If the number of paths and RF communication bands handled by the multiplexer increases, then adaptability and versatility are improved, but the number of filtering components required increases
Solution Approach 1:
The common path filter is designed to handle multiple RF communication bands simultaneously. By configuring the filter to create stopbands at specific frequencies, it can block interference from multiple paths and bands with a single filter structure, enabling the multiplexer to handle increased numbers of paths and bands without proportionally increasing filter component count
Solution Approach 2:
The patent uses parameter changes in the filter design, specifically adjusting the stopband frequencies and filter characteristics to match the specific RF communication bands being handled. This allows the same basic filter structure to be adapted for different frequency bands by modifying filter parameters rather than adding new filter components
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
This approach significantly reduces the number of filtering components required, enhances signal isolation, and maintains high quality factors at high frequency bands, effectively addressing the issue of insertion losses and noise interference.
Implementation Method 1
A first parallel resonant circuit is provided in shunt with respect to the second filter path and a second parallel resonant circuit is also provided in shunt with respect to the second filter path. The second parallel resonant circuit is weakly coupled to the first parallel resonant circuit.
Implementation Method 2
The second parallel resonant circuit is weakly coupled to the first parallel resonant circuit. In this manner, the weak coupling between the first parallel resonant circuit and the second parallel resonant circuit naturally creates the first stopband in the first frequency response within the second passband of the second frequency response.
Data Source
AI summary
Multiplexing circuitry is disclosed that includes filtering circuitry, which provides a first transfer function between a common port and a first port and a second transfer function between the common port and a second port. The first transfer function and second transfer function provide a first passband and a second passband, respectively. The first transfer function also has a stopband provided within the second passband of the second transfer function because the filtering circuitry includes a first filter path and a second filter path, wherein the second filter path has a first and second parallel resonant circuit provided in shunt with respect to the second filter path and weakly coupled to one another. The weak coupling between the first parallel resonant circuit and the second parallel resonant circuit naturally provides the stopband in the first transfer function within the second passband of the second transfer function.