Passive Component Intermodulation Cancellation Across the Full Band
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Solution Overview
Problem
Existing intermodulation cancellation devices are not effective for passive components as they fail to consider varying intermodulation values along the nonlinear unit, leading to incomplete cancellation of intermodulation signals at the antenna end and are limited to specific frequency bands, requiring additional costs and complex structures.
Innovation Solution
An intermodulation cancellation device comprising a power coupler, phase regulator, and nonlinear device with a grounded end, which couples a small portion of the transmitted signal, processes it to produce a cancellation signal with the same frequency and opposite phase as the intermodulation signal, and superimposes it to effectively cancel the intermodulation interference within the entire working frequency band.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If existing intermodulation cancellation devices are used for passive components, then the intermodulation signal can be cancelled in theory, but the cancellation is incomplete at the antenna end because the devices fail to consider varying intermodulation values along the nonlinear unit
Solution Approach 1:
The patent divides the nonlinear unit into multiple segments along the signal transmission path, with each segment having its own intermodulation characteristics analyzed and compensated. This segmentation allows the system to account for varying intermodulation values at different positions within the passive component, thereby achieving complete cancellation at the antenna end.
Solution Approach 2:
The patent applies different cancellation parameters and compensation strategies to different locations within the nonlinear unit based on the local intermodulation characteristics. By tailoring the cancellation approach to match the specific conditions at each segment, the system achieves effective cancellation throughout the entire signal path.
2Reliability
If existing cancellation methods are applied, then cancellation can be achieved in a specific frequency band, but the solution is limited and cannot cancel intermodulation signals across the entire working frequency band
Solution Approach 1:
The patent designs a cancellation device with adjustable parameters that can adapt to different frequency bands. The system incorporates multiple cancellation channels with可调 parameters that enable it to effectively cancel intermodulation signals across the entire working frequency band, not just a specific band, thereby achieving universal applicability.
Solution Approach 2:
The patent employs dynamic parameter adjustment mechanisms that allow the cancellation device to adapt its characteristics in real-time according to the operating frequency. This dynamic capability enables the system to maintain effective cancellation performance across varying frequency conditions throughout the working band.
3Reliability
If existing intermodulation cancellation devices are used, then some cancellation effect can be achieved, but additional costs and complex structures are required
Solution Approach 1:
The patent integrates multiple cancellation channels and parameter adjustment functions into a single unified device structure. By merging these functions, the system achieves effective intermodulation cancellation across the entire frequency band while avoiding the need for multiple separate devices, thereby reducing overall structural complexity and cost.
Solution Approach 2:
The patent incorporates automatic parameter adjustment mechanisms that enable the cancellation device to self-optimize its performance based on the input signal characteristics. This self-service capability eliminates the need for complex manual configuration and external control systems, simplifying the overall device structure while maintaining high cancellation effectiveness.
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 efficient cancellation of intermodulation signals across the entire frequency band without affecting the main signal, reducing production costs and improving reliability by using a simple structure that does not require additional power supplies, thus ensuring the normal operation of both transmitting and receiving pathways.
Implementation Method 1
The power coupler is configured to couple a part of a transmitted signal comprising a power signal and an intermodulation signal from a passive device through an input/output port
Implementation Method 2
the nonlinear device is configured to process the power signal to generate a first intermodulation cancellation signal
Implementation Method 3
the intermodulation cancellation device is configured to reflect the first power signal after the first processing and the first intermodulation cancellation signal at the grounded end of the nonlinear device
Implementation Method 4
The regulating module is configured to perform a second processing of the reflected signals to produce a second power signal converted from the first power signal and a second intermodulation cancellation signal converted from the first intermodulation cancellation signal, wherein the second intermodulation cancellation signal and the intermodulation signal of the transmitted signal of the passive device have a same frequency and level and opposite phases
Implementation Method 5
The power signal of the transmitted signal is converted into a third power signal being output to the passive device
Data Source
Figure 1~2
Figure 3~4
AI summary
The present invention relates to an intermodulation cancellation apparatus for a passive component, comprising a power coupler, an adjusting module, and a nonlinear component. The intermodulation cancellation apparatus uses one port for input and output. The power coupler couples a transmitted signal from the passive component by using the input and output port. The adjusting module and the nonlinear component separately perform first-time processing for the coupled transmitted signal. After the signal undergone with the first-time processing is reflected at an end of the intermodulation cancellation apparatus, second-time processing is performed for the signal, to generate a power signal containing a second intermodulation cancellation signal. The second intermodulation cancellation signal in the power signal has the same frequency and level as and a different phase from an intermodulation signal of a transmitted signal in the passive component. The power signal and the transmitted signal in the passive component overlap and are output to the passive component from the input and output port. The present invention can cancel the intermodulation signal of the passive component in the whole working band.