Adaptive Impedance Matching Network for Multi-Band Load Tuning
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Solution Overview
Problem
Existing adaptive impedance matching networks have a limited impedance matching range, which is frequency-dependent and inadequate for multi-band operations, particularly in radio-frequency micro-electromechanical systems (RF-MEMS) devices, leading to impedance mismatch issues and varying output power levels.
Innovation Solution
An adjustable impedance matching network that adjusts the real part of the matching impedance based on frequency information and a target reference value, while ensuring the imaginary part is substantially equal to a predetermined value, using a frequency-dependent criterion to relax capacitance tuning range requirements and achieve enhanced matching across multiple frequency bands.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a variable LC-network is used for impedance matching, then the matching can be adjusted for different frequencies, but the impedance matching range is limited by the tuning range of the variable elements
Solution Approach 1:
The patent divides the impedance matching function into two separate adjustable elements (first and second adjustable impedance elements) instead of using a single variable LC-network. This segmentation allows each element to be optimized for specific impedance components, thereby extending the overall matching range without requiring excessively wide tuning ranges from individual elements.
Solution Approach 2:
The patent changes the impedance parameters by adjusting both magnitude and phase separately through the two adjustable elements. By independently controlling the real and imaginary parts of the impedance, the system achieves a broader matching range while relaxing the tuning range requirements of individual components.
2Adaptability or versatility
If the impedance matching range is extended for multi-band operation, then the network can operate at more frequency bands, but the tuning range of variable capacitors and inductors must be increased
Solution Approach 1:
The patent segments the impedance control function into two independent adjustable elements, allowing each element to handle a portion of the impedance matching task. This division enables multi-band operation with moderate tuning ranges in each element, rather than requiring one element to cover the entire multi-band range.
Solution Approach 2:
The patent adds a phase dimension to impedance control by using two separate adjustable elements that can independently control different aspects of the impedance. This dimensional approach to impedance control enables multi-band operation without requiring extreme tuning ranges, as the system can achieve different impedance states through combinations of the two elements.
3Adaptability or versatility
If a large impedance tuning range is provided for load-line adaptation, then output power levels can be optimized over wide ranges, but the variable network requires extensive tuning capability
Solution Approach 1:
The patent segments the load-line adaptation function across two adjustable impedance elements, allowing the system to achieve a large effective tuning range through the combination of both elements. Each element operates within a moderate range, but their combined effect provides the extensive tuning capability needed for wide-range power optimization.
Solution Approach 2:
The patent enables extensive parameter changes in the overall impedance by using two independently adjustable elements. This approach allows the system to achieve large impedance tuning ranges for load-line adaptation while keeping the individual element ranges moderate, as the combined effect of both elements provides the full adaptation range.
Data Source
AI summary
An adjustable impedance matching network for providing an adjustable matching impedance (Rm) is presented. The matching network includes first and second impedance adjusting circuits. The first impedance adjusting circuit is adapted to adjust the value of an imaginary part of the matching impedance while substantially maintaining the value of a real part of the matching impedance based on frequency information frequency and a target reference value. The second impedance adjusting circuit is adapted to adjust the value of an imaginary part of the matching impedance to be substantially equal to zero based on the frequency information, so as to adjust the real part of the matching impedance to be substantially equal to the target reference value.