Adaptive Antenna Impedance Matching for Mobile Radio Sensitivity
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Solution Overview
Problem
Conventional mobile radio apparatuses face challenges in quickly and effectively adapting impedance matching between antennas and transmission/reception circuits due to varying user situations and unpredictable antenna impedance changes, leading to mismatching losses and reduced transmission/reception sensitivity.
Innovation Solution
A mobile radio apparatus with a matching circuit having a variable load value, controlled by a section that evaluates initial load value information and derives matched load values using genetic algorithms or steepest descent methods to ensure rapid impedance matching, regardless of the device's use situation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If conventional impedance matching methods are used, then impedance matching can be achieved, but the matching speed is slow and cannot adapt to sudden impedance changes
Solution Approach 1:
The patent pre-calculates and stores optimal matching component values (capacitance and inductance) for various impedance conditions in a lookup table before actual operation. When impedance changes occur, the system quickly retrieves pre-computed values instead of performing real-time calculations, enabling instantaneous adaptation to impedance variations while maintaining matching accuracy.
Solution Approach 2:
The patent divides the continuous impedance matching problem into discrete segments by creating a lookup table with pre-calculated matching parameters for different impedance scenarios. This segmentation allows the system to switch between predefined matching states rapidly, achieving both speed and reliability in impedance adaptation.
2Measurement precision
If extensive impedance tables are stored in advance, then matching accuracy is improved, but device complexity and memory requirements increase
Solution Approach 1:
The system performs preliminary calculations of matching parameters and stores them in a compact lookup table organized by impedance conditions. This pre-computation approach achieves high matching precision without requiring complex real-time calculation hardware, as the heavy computational work is done in advance and stored efficiently.
Solution Approach 2:
The patent optimizes the storage structure by parameterizing the impedance table based on key impedance characteristics rather than storing all possible combinations. This parameterization reduces memory requirements while maintaining matching precision, as the system can interpolate or select from parameterized entries rather than storing exhaustive data.
3Ease of operation
If manual impedance adjustment is used, then matching can be achieved, but operation time and user burden increase
Solution Approach 1:
The patent implements automatic impedance matching by detecting antenna impedance changes and autonomously selecting appropriate matching parameters from the stored lookup table. The system performs self-adjustment without user intervention, eliminating manual tuning operations and reducing the time required to adapt to impedance variations while improving ease of operation.
Solution Approach 2:
The system continuously monitors antenna impedance and provides feedback to the control logic, which automatically adjusts matching parameters based on detected conditions. This closed-loop feedback mechanism enables rapid, hands-free impedance matching, eliminating manual adjustment steps and reducing operational time.
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 enables instantaneous and adaptive impedance matching, reducing mismatching losses and enhancing transmission/reception sensitivity across various user scenarios, while minimizing the need for extensive pre-stored impedance tables.
Implementation Method 1
a matching circuit for matching an impedance between the antenna and the signal processing section, the matching circuit being connected between the antenna and the signal processing section, and having a variable load value
Implementation Method 2
controlled by a section that evaluates initial load value information and derives matched load values using genetic algorithms or steepest descent methods to ensure rapid impedance matching
Implementation Method 3
controlled by a section that evaluates initial load value information and derives matched load values using genetic algorithms or steepest descent methods to ensure rapid impedance matching
Data Source
AI summary
There is provide a mobile radio apparatus capable of suppressing a mismatching loss, and increasing a transmission/reception sensitivity by means of instantly and adaptively matching the impedance between the antenna and the transmission/reception circuit whatever situation a mobile radio apparatus, such as a mobile phone or the like, may be. In a mobile radio apparatus (1), when starting control of the matching circuit (102), a control section (105) evaluates an initial chromosome stored in a storage section (106), and if there is an initial chromosome for providing an impedance matching, controls the matching circuit (102) so as to have a load value corresponding to this initial chromosome. If there is no initial chromosome for providing the impedance matching, the control section (105) evolves the initial chromosome with a genetic algorithm, derives a chromosome for providing the impedance matching, and controls the matching circuit (102) so as to have a load value corresponding to the derived chromosome.