Antenna Tunable Element Adjusts Electrical Length to Reduce Signal Reflection
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Solution Overview
Problem
Existing electronic devices face challenges in tuning antennas to achieve optimal radiation efficiency, particularly when the resonant frequency shifts, as traditional impedance matching methods using look-up tables are not universally applicable and may not provide optimal results across various device models.
Innovation Solution
An electronic device with a tunable element and a control circuit that adjusts the electrical length of the radiating portion to minimize signal reflection at a specified frequency, by transmitting signals and acquiring reflection values to determine the optimal time constant for the tunable element, thereby improving radiation performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If impedance matching is performed using a look-up table, then the radiation performance of the antenna is improved, but the method is not universally applicable across various device models and may not provide optimal matching values
Solution Approach 1:
The patent implements dynamic impedance matching by continuously monitoring the reflected signal strength and adjusting the tunable element in real-time, rather than relying on static pre-stored look-up tables. This allows the antenna system to adapt to different device models and resonant frequency shifts dynamically, resolving the contradiction between maintaining reliable radiation performance and achieving universal applicability across various device models.
Solution Approach 2:
The patent introduces a feedback mechanism where the control circuit continuously measures the reflected signal strength from the radiating portion and uses this information to adjust the tunable element's value. This closed-loop feedback system enables the antenna to automatically optimize its impedance matching for any device model, making the solution universally applicable while maintaining optimal radiation performance.
2Productivity
If the resonant frequency of the antenna shifts, then the antenna cannot transmit signals efficiently at the specified frequency, but adjusting the electrical length requires additional control mechanisms
Solution Approach 1:
The patent implements a self-service mechanism where the antenna system automatically detects resonant frequency shifts through reflected signal monitoring and self-adjusts its electrical length using the tunable element. The control circuit autonomously determines when adjustment is needed and executes the tuning without external intervention, maintaining signal transmission efficiency while minimizing the complexity of control mechanisms through automated operation.
3Reliability
If a tunable element is added to adjust the electrical length of the radiating portion, then the radiation efficiency is improved, but the device complexity increases
Solution Approach 1:
The patent changes the electrical parameter (electrical length) of the radiating portion by incorporating a tunable element that can adjust its capacitance or inductance value. This parameter adjustment allows the antenna to maintain optimal radiation efficiency across different resonant frequency conditions while keeping the structural complexity relatively low, as the tunable element integrates into the existing antenna architecture rather than requiring complete redesign.
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 enhances radiation efficiency by adaptively tuning the antenna to match the specified frequency, reducing signal reflection and improving overall performance even when the resonant frequency changes.
Implementation Method 1
the electronic device may perform impedance matching by tuning the element based on a look-up table
Implementation Method 2
determine strength of a signal reflected from the radiating portion
Data Source
AI summary
Disclosed is an electronic device including an antenna including a radiating portion and a feeding portion connected to the radiating portion; a tunable element electrically connected to the radiating portion and configured to influence an electrical length of the radiating portion with respect to a specified frequency; an amplifier electrically connected to the feeding portion and configured to amplify a signal to be transmitted to an external electronic device through the radiating portion; and a control circuit electrically connected with the antenna, the tunable element, and the amplifier. The control circuit is configured to determine strength of a signal reflected from the radiating portion while the signal is transmitted to the external electronic device through the radiating portion; and adjust a value of the tunable element to reduce the strength of the reflected signal.