Bias Tee Nested Inductor Isolation RF Signal Integrity
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Solution Overview
Problem
Conventional bias tee arrangements in RF filter apparatus fail to provide sufficient isolation between DC and low frequency control signals and RF communication signals for frequencies below 1GHz, leading to intermodulation distortion and interference.
Innovation Solution
Incorporating a second inductor within a sleeve or tube member in the bias tee apparatus, which enhances isolation between the DC bypass pathway and the RF communication signal pathway without increasing space or component count, using a combination of capacitors and inductors to prevent RF leakage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional bias tee arrangement with a single inductor and capacitor is used, then the structure is simple and space is saved, but insufficient isolation between DC bypass pathway and RF communication signal pathway occurs for frequencies below 1GHz
Solution Approach 1:
The patent places a second inductor inside the sleeve or tube member of the first capacitor, creating a nested configuration where one component is housed within another. This nesting approach increases isolation performance by adding another inductive element in the RF signal pathway without increasing the overall footprint or component count, thereby resolving the contradiction between improved isolation and device complexity.
Solution Approach 2:
The invention utilizes the spatial dimension within the existing capacitor sleeve structure to accommodate an additional inductor. By exploiting the three-dimensional space already present in the bias tee assembly, the patent adds isolation functionality without requiring additional mounting space or increasing the structural complexity from a planar perspective.
2Reliability
If additional components are added to improve isolation, then RF signal integrity is improved, but space and cost increase
Solution Approach 1:
The patent combines the second inductor with the first capacitor by placing the inductor inside the capacitor's sleeve structure. This merging approach allows two functional components to occupy the same physical space, thereby improving RF signal integrity through enhanced isolation without requiring additional mounting space or increasing manufacturing complexity and cost.
Solution Approach 2:
By nesting the second inductor within the first capacitor's sleeve, the patent achieves space-efficient component arrangement. The nested configuration allows the additional isolation component to be accommodated within the existing structural envelope, avoiding increases in overall device volume, material usage, and associated costs.
3Reliability
If a second inductor is placed inside the capacitor sleeve, then isolation is significantly improved without increasing space, but manufacturing complexity increases
Solution Approach 1:
The patent incorporates the second inductor during the capacitor assembly process, where the inductor is placed inside the sleeve before the capacitor is fully assembled or sealed. This preliminary action ensures that the nested configuration is established during manufacturing rather than requiring post-assembly installation, thereby minimizing additional manufacturing steps and maintaining ease of production.
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 configuration significantly reduces intermodulation distortion, improves RF signal integrity, and allows for more flexible cavity design in RF filter apparatus, reducing the need for additional components and saving space and cost.
Implementation Method 1
The DC bypass pathway includes at least a first inductor means for helping to prevent the passage of one or more RF communication signals therealong
Implementation Method 2
The RF communication signal pathway includes at least first and second capacitor means for helping to prevent the passage of DC and control signals therealong
Implementation Method 3
at least one of the at least first or second capacitor means includes a sleeve or tube member and at least a second inductor means is located in an interior of the sleeve or tube member
Data Source
Figure 1a~1b
Figure 2a~2b
Figure 3a~3d
AI summary
Bias tee apparatus is provided for radio frequency (RF) apparatus. The bias tee apparatus includes an input pathway for the passage of one or more radio frequency (RF) communication signals and direct current (DC) therealong in use. The input pathway divides into a DC bypass pathway to allow the passage of direct current (DC) therealong in use and an RF communication signal pathway for the passage of one or more RF communication signals therealong in use. The DC bypass pathway including at least a first inductor means for helping to prevent the passage of one or more RF communication signals therealong in use, and the RF signal pathway including at least first and second capacitor means for helping to prevent the passage of DC therealong in use. At least one of the at least first or second capacitor means includes a sleeve or tube member and at least a second inductor means is located in an interior of the sleeve or tube member.