Tunable Matching Network for Mobile Antenna Body Effect
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Solution Overview
Problem
Existing mobile device antenna matching techniques, such as Fixed Matching Network (FMN) and Tunable Matching Network (TMN), fail to adequately account for a user's body effect and device state, leading to RF performance issues like call drops and muted signals, especially in weak signal environments.
Innovation Solution
An apparatus and method for determining optimal TMN circuit adjustment values using a lookup table based on criteria like device mode, slide status, position, and connected devices, to perform antenna matching and improve RF performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a Fixed Matching Network (FMN) technique using a fixed LC circuit is employed, then the device structure is simple, but the RF performance degrades under weak signal environments due to inability to adapt to body effects and device states
Solution Approach 1:
The patent applies the dynamics principle by transitioning from a fixed LC circuit to a tunable matching network where the inductance and capacitance values can be dynamically adjusted based on detected device states and body effects. This allows the matching circuit to adapt in real-time to changing conditions, resolving the contradiction between structural simplicity and RF performance reliability.
Solution Approach 2:
The patent implements parameter changes by modifying the L and C values of the matching circuit based on detected environmental factors and device states. A lookup table stores pre-determined optimal L and C parameter combinations for various scenarios, allowing the system to switch parameters dynamically without complex real-time calculations, thus maintaining simplicity while improving reliability.
2Reliability
If a Tunable Matching Network (TMN) technique using a variable LC circuit is used, then the RF performance is improved according to field conditions, but the device complexity increases due to additional tuning components and control mechanisms
Solution Approach 1:
The patent applies preliminary action by pre-calculating and storing optimal L and C parameter combinations in a lookup table for various device states and body effect scenarios. This eliminates the need for complex real-time optimization algorithms, reducing computational complexity while maintaining the ability to achieve optimal RF performance through simple table lookup and parameter switching.
Solution Approach 2:
The system implements self-service by automatically detecting device states and body effects, then autonomously selecting appropriate L and C parameters from the lookup table without requiring manual intervention or complex external control systems. This reduces the overall system complexity while maintaining adaptive RF performance.
3Ease of operation
If antenna matching is performed without considering body effects and device states, then the device operation is simple, but call drops and muted signals occur frequently in weak signal environments
Solution Approach 1:
The patent implements feedback by continuously monitoring device states (such as holding position, talking position, pocket position) and body effects, then using this feedback information to dynamically adjust the matching circuit parameters. This closed-loop approach ensures optimal RF performance and call connectivity while keeping the operation simple through automatic adjustment.
Solution Approach 2:
The patent replaces manual or mechanical adjustment mechanisms with electronic sensing and digital control systems. Sensors detect device states and body effects, and a processor automatically selects optimal parameters from a lookup table, substituting complex mechanical tuning mechanisms with simpler electronic control while improving reliability.
Data Source
AI summary
An apparatus and a method of realizing an antenna matching in accordance with a user's body effect and a state of a mobile device are provided. The method includes determining a state of the mobile device on a basis of a call mode and at least one of whether an external device is connected to the mobile device, whether a receiver is being used, whether a speaker is being used, and whether a proximity sensor is activated, determining an optimal Tunable Matching Network (TMN) circuit adjustment value in accordance with the determined state, and performing the antenna matching in accordance with the optimal TMN circuit adjustment value.