Antenna Device Capacitor Configuration for Coupling Coefficient
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Solution Overview
Problem
Existing antenna devices face challenges in achieving favorable communication characteristics due to the limited coupling coefficient between the antenna device and the coil antenna of a communication target, primarily because the inductance of the second coil connected to the conductive member is too high, hindering effective magnetic coupling.
Innovation Solution
The antenna device incorporates a first coupling conductor connected to a power supply circuit, a second coupling conductor magnetically coupled to the first, a first capacitor in series with the second coupling conductor, and an electrically conductive member with inductance connected in parallel to the second capacitor, forming a magnetic-field radiating element with a smaller first capacitor capacitance compared to the second, thereby increasing current flow and coupling coefficient.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a conventional antenna design is used, then the structure is simple, but the communication characteristics are unfavorable due to limited coupling coefficient
Solution Approach 1:
The antenna device is segmented into two functionally distinct coils: the first coil for power supply coupling and the second coil for communication target coupling. This segmentation enables optimization of communication characteristics through reduced second coil inductance while maintaining structural simplicity through the use of standard electronic components.
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 enhances the coupling coefficient between the antenna device and the coil antenna, improving communication characteristics while reducing the size of the antenna device and electronic device, and stabilizing the electric potential to prevent noise emission.
Implementation Method 1
a second coupling conductor that is at least magnetically coupled to the first coupling conductor
Implementation Method 2
a first capacitor that is connected in series to the second coupling conductor, a second capacitor
Implementation Method 3
an electrically conductive member that includes an inductance component and that is connected in parallel to the second capacitor
Data Source
AI summary
An antenna device includes a first coupling conductor connected to a power supply circuit, a second coupling conductor at least magnetically coupled to the first coupling conductor, a first capacitor connected in series to the second coupling conductor, a second capacitor connected in parallel to a series circuit including the second coupling conductor and the first capacitor, and an electrically conductive member connected to the second capacitor and defining a portion of or the entire closed loop together with the second capacitor. The capacitance of the first capacitor is smaller than the capacitance of the second capacitor.