Antenna Impedance Tuning Using Transmit Reflection Coefficients
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Solution Overview
Problem
Antenna performance in electronic devices is affected by impedance mismatch and resonant frequency changes due to environmental factors, leading to reduced transmission efficiency.
Innovation Solution
An electronic device with an antenna, RFIC, coupler, and tuner, controlled by a processor, measures reflection coefficients at different frequencies to determine a tuning code for impedance matching, improving reception performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If antenna tuning is performed using reflection coefficient measured at transmit frequency, then device complexity is reduced, but measurement precision may deteriorate
Solution Approach 1:
The patent uses reflection coefficients measured at transmit frequencies as a substitute (copy) for directly measuring reflection coefficients at receive frequencies. By establishing a correlation model between transmit and receive frequency reflection coefficients, the system avoids the complexity of separate receive frequency measurements while maintaining sufficient accuracy for antenna tuning purposes.
Solution Approach 2:
The patent transforms the measurement parameter from receive frequency reflection coefficient to transmit frequency reflection coefficient. By changing the frequency parameter and using the measured data from one frequency to infer conditions at another frequency, the system simplifies the measurement process while still achieving effective antenna tuning.
2Adaptability or versatility
If multiple frequency bands are supported, then adaptability is improved, but device complexity increases
Solution Approach 1:
The patent implements a universal antenna tuning approach where the same measurement and control methodology is applied across multiple frequency bands. The processor uses the same correlation-based method to determine tuning codes for different receive frequency bands, making the system multi-functional without requiring separate tuning mechanisms for each band.
Solution Approach 2:
The patent employs dynamic tuning codes that can be adjusted based on the specific frequency band and operating conditions. The processor dynamically selects appropriate tuning codes from a codebook or determines them through calculation based on the measured reflection coefficients and their correlation with receive frequency performance.
Data Source
AI summary
An electronic device includes an antenna configured to transmit and receive signals within a plurality of frequency bands, a RFIC configured to transmit the signals within the plurality of frequency bands to the antenna, a coupler configured to transmit at least a portion of signals reflected from the antenna to the RFIC, a tuner connected to the antenna and the coupler, and a processor connected to the RFIC and the tuner, the processor configured to obtain a third reflection coefficient at a first receiving frequency based on a first reflection coefficient at a first transmission frequency and a second reflection coefficient at a second transmission frequency that is greater than the first transmission frequency, determine, based on the third reflection coefficient, a first receiving tuning code for performing impedance matching to the antenna, and control impedance of the antenna with the tuner based on the first receiving tuning code.