Multi-Port Tuning Unit Automatic Impedance Matching
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Solution Overview
Problem
There is no known solution for optimally and automatically adjusting a multiple-input-port and multiple-output-port tuning unit without complex computations or many iterations, especially when losses in the tuning unit are not small.
Innovation Solution
The method uses an open-loop control scheme to estimate real quantities representing the impedance matrix seen by the target ports, which are used to determine tuning control signals that adjust the reactance of adjustable impedance devices, allowing for minimal loss power transfer without influencing the impedance matrix at the target ports.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If closed-loop control with feedback is used to adjust impedance, then tuning precision is improved, but computation complexity and iteration time increase significantly
Solution Approach 1:
The patent pre-calculates and stores the relationship between impedance parameters and tuning control signals in a lookup table during system initialization or manufacturing. During operation, the controller simply queries this pre-computed table based on measured impedance values, avoiding complex real-time iterations while maintaining accurate impedance matching.
Solution Approach 2:
The patent creates a simplified model or lookup table that copies the essential characteristics of the complex impedance matching relationship. Instead of performing full complex computations, the system uses this pre-established model to directly determine tuning signals, significantly reducing computational burden while preserving matching accuracy.
2Measurement precision
If iterative adjustment methods are used to achieve optimal tuning, then impedance matching accuracy is improved, but tuning time increases
Solution Approach 1:
The optimal tuning parameters are pre-determined and stored in a lookup table before actual operation. When tuning is needed, the system directly retrieves the pre-calculated optimal parameters based on current impedance measurements, eliminating the need for time-consuming iterative adjustments while maintaining high matching accuracy.
Solution Approach 2:
The patent replaces the mechanical iterative adjustment process with a direct lookup and application of pre-computed parameters. This substitution transforms a time-consuming sequential process into an instantaneous retrieval operation, dramatically reducing tuning time while preserving accuracy.
3Measurement precision
If complex computation algorithms are used for multi-port impedance matching, then tuning accuracy is improved, but processing speed decreases
Solution Approach 1:
The patent performs complex multi-port impedance matching calculations in advance and stores the results in a lookup table. During actual operation, the system quickly queries this table using measured impedance values, obtaining accurate matching parameters without performing complex real-time computations, thus maintaining both accuracy and speed.
Data Source
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AI summary
The invention relates to a method for automatically adjusting a multiple-input-port and multiple-output-port tuning unit, for instance a multiple-input-port and multiple-output-port tuning unit coupled to the antennas of a radio transceiver using a plurality of antennas simultaneously. The invention also relates to an automatic tuning system using this method. An automatic tuning system has 4 user ports (712) (722) (732) (742) and 4 target ports (911) (921) (931) (941), and comprises: 4 sensing units (9); a signal processing unit (8), the signal processing unit estimating real quantities depending on an impedance matrix seen by the target ports, using the sensing unit output signals obtained for 4 excitations applied to the user ports, the signal processing unit delivering a tuning instruction; a multiple-input-port and multiple- output-port tuning unit (3) comprising adjustable impedance devices; and a tuning control unit (4) receiving the tuning instruction and delivering tuning control signals to the multiple- input-port and multiple-output-port tuning unit, the reactance of each of the adjustable impedance devices being mainly determined by one or more of the tuning control signals.