5G Common Filter PIMD Reduction via Adaptive Coupling
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Solution Overview
Problem
Current mobile communication systems face significant challenges in reducing passive intermodulation distortion (PIMD) interference, particularly with the increasing demand for 5G networks and multi-channelization, which affects the quality of mobile communications.
Innovation Solution
A 5G common filter is developed using a coupling method that varies between common poles and striplines based on the frequency interval between different frequency band signals, allowing for improved PIMD performance by combining outputs of multiple carriers into a single antenna.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single coupling method is used for all frequency bands, then the device structure is simple, but PIMD performance deteriorates
Solution Approach 1:
The patent applies different coupling methods (common pole coupling for close frequency bands, stripline coupling for distant frequency bands) to different frequency band combinations based on their specific characteristics. This local differentiation optimizes PIMD performance for each frequency pair while managing overall system complexity.
2Reliability
If common pole coupling is used for close frequency bands, then PIMD performance is improved, but manufacturing precision requirements increase
Solution Approach 1:
The patent adjusts coupling parameters such as pole position, coupling coefficient, and impedance values to optimize performance while accounting for manufacturing tolerances. By carefully selecting and tuning these parameters, the system achieves good PIMD performance without requiring excessively tight manufacturing precision.
3Manufacturing precision
If stripline coupling is used for distant frequency bands, then manufacturing precision requirements are reduced, but PIMD performance deteriorates
Solution Approach 1:
The patent selectively applies stripline coupling only to frequency bands that are sufficiently distant from each other, where the relaxed coupling requirements of stripline topology can be effectively utilized. This local application strategy maintains acceptable PIMD performance while benefiting from easier manufacturing.
4Reliability
If multiple coupling methods are used for different frequency bands, then PIMD performance is improved, but device complexity increases
Solution Approach 1:
The patent divides the frequency band combination task into segments, assigning different coupling methods to different frequency pairs based on their separation distance. This segmentation allows each frequency pair to be optimized independently while maintaining overall system manageability and reducing the complexity burden of using multiple coupling techniques.
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 reduces PIMD interference while optimizing space utilization, enhancing the quality of mobile communications by adapting coupling methods according to frequency band signals, thereby improving the overall performance of common couplers.
Implementation Method 1
a first coupler for combining a first band signal and a second band signal combines and a second coupler for combining output of the first coupler and a third band signal
Implementation Method 2
the common poles may be formed with a frequency resonator to which frequency band signals flow
Implementation Method 3
the striplines may be used on a PCB pattern for combining at least two frequency band signals
Data Source
AI summary
Proposed is a 5G common filter with excellent PIMD performance using a coupling method upon combining frequency bands and a filtering method therewith that are capable of combining outputs of multiple carriers into one and transmitting it to an antenna by improving PIMD performance and are capable of improving PIMD performance of common couplers by changing coupling methods depending on frequency band signals of multiple carriers including 5G. The 5G common filter with excellent PIMD performance using a coupling method upon combining frequency bands in accordance with the present invention comprises a first coupler for combining a first band signal and a second band signal; and a second coupler for combining output of the first coupler and a third band signal.