Impedance Matching Apparatus Adaptive Tuning Antenna Circuit
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Solution Overview
Problem
Existing adaptive tuning antenna circuits in mobile communication terminals require extensive scanning of variable capacitor regions to maintain optimal impedance matching, leading to degraded RF performance due to prolonged processing time and power consumption.
Innovation Solution
An impedance matching apparatus and method that sets a first searching region within the variable capacitor's range, detects optimal impedance matching points using transmit and reflected power, and progressively narrows the search area to efficiently find the final matching point, reducing the scanning area by up to a quarter of the conventional region.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the whole region of the variable capacitor is scanned to find the optimal impedance matching point, then the impedance matching accuracy is improved, but the time consumption and power consumption increase significantly
Solution Approach 1:
The patent divides the variable capacitor's whole region into multiple sub-regions and performs sequential scanning in each sub-region. This segmentation approach reduces the scanning area in each step while ensuring the optimal point is found, thereby decreasing overall time consumption without sacrificing matching accuracy.
Solution Approach 2:
The patent performs preliminary scanning in a first sub-region to identify a candidate optimal point, then uses this information to guide subsequent scanning in other sub-regions. This preliminary action eliminates the need to scan the entire region exhaustively, significantly reducing time consumption while maintaining accuracy.
2Reliability
If the whole region of the variable capacitor is scanned to ensure optimal impedance matching, then the RF performance is improved, but the power consumption increases
Solution Approach 1:
The patent segments the scanning process into multiple stages with progressively smaller sub-regions. By limiting each scanning stage to a specific sub-region rather than the entire variable capacitor range, power consumption is reduced while still achieving optimal RF performance through systematic search.
Solution Approach 2:
The patent performs preliminary identification of the optimal point in a first sub-region before conducting more refined scanning in subsequent sub-regions. This preliminary action reduces the total scanning range required, thereby lowering power consumption while ensuring optimal RF performance is achieved.
3Manufacturing precision
If extensive scanning of the variable capacitor region is performed, then the impedance matching precision is improved, but the processing time increases
Solution Approach 1:
The patent divides the impedance matching process into multiple scanning stages, each operating on a specific sub-region of the variable capacitor. This segmentation enables parallel or sequential processing of different regions, improving processing speed while maintaining matching precision through systematic coverage of all necessary areas.
Solution Approach 2:
The patent performs preliminary scanning to quickly identify the sub-region containing the optimal point, then focuses subsequent detailed scanning only on that identified area. This preliminary action dramatically reduces the total processing time required while ensuring high impedance matching precision is achieved in the final result.
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 approach enables high-speed impedance matching with reduced power consumption and prevents signal degradation caused by abnormal capacitance values, achieving optimal RF performance within a shorter time.
Implementation Method 1
the adaptive tuning antenna circuit includes a coupler to detect reflected power and forward power output from the coupler, and to change the capacitance of a variable capacitor according to the reflected power and the forward power
Implementation Method 2
a detector to detect transmit power and reflected power reflected by the antenna
Data Source
AI summary
Disclosed are an impedance matching method, an impedance matching apparatus for the same, and a record medium. The impedance matching apparatus includes an impedance matching part connected to an antenna to transmit/receive a radio wave and including at least one variable capacitor, a detector to detect transmit power and reflected power reflected by the antenna, and a controller to set a first searching region within a whole variation range of the variable capacitor, to detect an optimal impedance matching point within the first searching region by using at least one of the transmit power and the reflected power, and to set a next searching region about the optimal impedance matching point to search for a final impedance matching point within the whole variation range of the variable capacitor.