Antenna Tuner Impedance Compensation for Mobile Terminals
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Solution Overview
Problem
Mobile terminals experience deteriorated wireless communication performance due to impedance distortion caused by external environments, such as a user's body, which affects the antenna's ability to transmit and receive signals effectively.
Innovation Solution
The mobile terminal incorporates an antenna tuner and a tuning line with a specific length difference from the feeding line, compensated by a matching network, isolator, and bandpass filter to counteract impedance mismatch, ensuring stable signal transmission and reception.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If an antenna radiator is used to transmit and receive radio signals, then wireless communication function is enabled, but impedance distortion occurs when a user's body approaches the antenna, deteriorating communication performance
Solution Approach 1:
An antenna tuner is introduced as an intermediary component between the signal supply unit and the antenna radiator. The antenna tuner includes a tuning line with specific impedance characteristics that compensates for impedance distortion caused by external factors such as user's body proximity, thereby maintaining stable wireless communication performance
Solution Approach 2:
The patent changes the impedance parameter by designing the tuning line with specific length and impedance values. The tuning line's impedance is calculated to be approximately 50Ω and its length is designed to be about 1/4 wavelength of the operating frequency, which transforms and compensates for the impedance distortion caused by external environment
2Reliability
If an antenna tuner with tuning line is added to compensate for impedance, then wireless communication performance is stabilized, but device complexity increases
Solution Approach 1:
The antenna tuner is merged with the existing antenna assembly by integrating the tuning line and antenna tuner components into a compact configuration near the antenna radiator. This combining approach stabilizes communication performance while minimizing the increase in overall device complexity
Solution Approach 2:
The impedance compensation is implemented locally at the antenna feed point rather than requiring system-wide changes. The tuning line is positioned specifically where impedance matching is needed, allowing targeted correction with minimal additional complexity
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 configuration prevents significant deterioration of wireless communication performance even when the user's hand approaches the antenna, maintaining signal quality and reducing manufacturing costs due to a simple structure that does not require separate power consumption.
Implementation Method 1
the tuning line and the antenna tuner compensate for impedance of the feeding line and the antenna radiator
Implementation Method 2
an antenna radiator packaged in the case, including a conductive material and transmitting and receiving a signal of a first frequency
Data Source
AI summary
A mobile terminal comprises a case; a main board packaged in the case; a signal supply unit packaged on the main board, supplying a radio signal; an antenna radiator packaged in the case, including a conductive material and transmitting and receiving a signal of a first frequency; an antenna tuner packaged in the case, including a conductive material; a feeding line located on the main board, having one end connected with the signal supply unit and the other end connected with the antenna radiator; and a tuning line located on the main board, having one end connected to the feeding line and the other end connected with the antenna tuner, wherein the tuning line and the antenna tuner compensate for impedance of the feeding line and the antenna radiator. The mobile terminal can prevent wireless communication performance from being deteriorated by impedance distorted by an external environment like that a body of a user approaches the antenna radiator.