Wireless Communication Apparatus Impedance Matching Switching
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
The existing wireless communication apparatuses face issues with impedance mismatch between the shared antenna and the circuit during communication and power reception, leading to unnecessary reflected waves, reduced communicable distance, and decreased power supply, due to the inability to switch impedance matching circuits effectively between these states.
Innovation Solution
A wireless communication apparatus with a shared antenna and an impedance matching circuit that includes switch elements and an impedance matching adjustment circuit, allowing for on/off state switching to achieve optimal impedance matching for both communication and power reception.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the impedance of the matching circuit is decreased to flow a large current for power reception, then the charging time is shortened, but unnecessary reflected waves are generated during communication, resulting in decreased communicable distance and decreased power supply amount
Solution Approach 1:
The patent applies dynamics by making the impedance matching circuit adjustable between different states. The switching element changes the connection state of the capacitor based on whether the system is in communication mode or power reception mode, allowing the impedance to be dynamically optimized for each function. This resolves the contradiction by enabling low impedance during power reception (reducing reflected waves) and high impedance during communication (improving communicable distance).
2Device complexity
If the impedance matching circuit is not switched between communication and power reception states, then the device complexity is reduced, but the communicable distance and power supply amount decrease due to unnecessary reflected waves
Solution Approach 1:
The patent introduces a switching element that dynamically changes the circuit configuration based on operational mode. During communication, the switching element connects the capacitor in a configuration that provides appropriate impedance matching for signal transmission. During power reception, the switching element reconfigures the capacitor connection to optimize power transfer. This dynamic adjustment maintains high communication quality and power supply efficiency without significantly increasing device complexity.
3Use of energy by moving object
If the transmission power is lowered to extend battery operation time, then the energy consumption is reduced, but the power supply amount during power reception decreases
Solution Approach 1:
The patent applies parameter changes by adjusting the impedance parameter of the matching circuit based on the operational state. By changing the impedance parameter through switching element control, the system optimizes power transfer efficiency during power reception, ensuring maximum power supply amount even when transmission power is lowered for energy conservation during communication mode.
Data Source
AI summary
A wireless communication apparatus which comprises: a shared antenna shared for communication and power reception; an impedance matching circuit connected to the shared antenna and having a first switch element; a communication circuit connected to the impedance matching circuit; a second switch element connected to the first switch element; and an impedance matching adjustment circuit configured to switch an on/off state of each of the first switch element and the second switch element at the time of communication and at the time of power reception.