Wearable Antenna Dynamic Impedance Matching Switch
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Solution Overview
Problem
Current wearable devices fail to maintain effective impedance matching between their antennas and circuitry across various environments, leading to reduced wireless transmission efficiency due to changes in external conditions.
Innovation Solution
Incorporating two matching circuits with different impedance values and a switch element that dynamically connects the antenna to the appropriate matching circuit based on environmental conditions detected by a sensing element, ensuring optimal impedance matching and resonant frequency alignment within a desirable frequency band.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a single matching circuit is used in wearable devices, then the device structure remains simple, but the impedance matching performance deteriorates under various environmental conditions
Solution Approach 1:
The patent implements dynamic impedance matching by switching between different matching circuits based on environmental conditions. The system transitions from a static single matching circuit to a dynamic multi-matching circuit configuration, where the switch element selects the appropriate matching circuit (first or second) according to the detected environment, thereby maintaining reliable impedance matching across varying conditions.
Solution Approach 2:
The patent changes the impedance parameters by providing multiple matching circuits with different impedance values. The first matching circuit has a first impedance value and the second matching circuit has a second impedance value, allowing the system to select the appropriate impedance parameter based on environmental conditions, thus resolving the contradiction between matching performance and structural simplicity.
2Productivity
If multiple matching circuits are added to improve impedance matching under various environments, then the transmission efficiency improves, but the device complexity increases
Solution Approach 1:
The system uses a dynamic switching mechanism controlled by a switch element that selects between the first and second matching circuits based on environmental detection. This dynamic approach enables high transmission efficiency across various environments without requiring all matching circuits to be simultaneously active, thus improving productivity while managing device complexity through selective activation.
3Reliability
If the antenna is dynamically switched between different matching circuits, then the resonant frequency alignment improves, but the control system complexity increases
Solution Approach 1:
The patent employs a feedback mechanism where a sensing element detects environmental conditions and provides information to control the switch element. This feedback loop enables the system to automatically adjust the antenna connection to the appropriate matching circuit, maintaining reliable resonant frequency alignment without requiring complex manual control, thus resolving the contradiction between frequency alignment reliability and control system complexity.
Data Source
AI summary
A wearable device and method for operating the same are provided. The wearable device includes an antenna element, a first matching circuit, a second matching circuit, and a switch element. The first matching circuit has a first impedance value. The second matching circuit has a second impedance value different from the first impedance value. The switch element is configured to determine whether the antenna element is electrically connected with the first matching circuit or the second matching circuit.