Antenna Device With Opposite Phase Coils for Hot Spot Positioning
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Solution Overview
Problem
The reduction in size and increase in packing density of electronic devices make it difficult to install antenna coils in a way that allows for a desired positioning of hot spots for short-range wireless communication, leading to unwanted coupling with surrounding components and decreased performance.
Innovation Solution
The use of a main coil antenna and a sub-coil antenna, arranged side by side with opposite magnetic phases, creates a closed magnetic circuit that allows the hot spot to be positioned at a desired location, such as above the midpoint between the coils, providing flexibility in antenna coil placement and directivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If the antenna coil is disposed close to surrounding components to save space, then the packing density is improved, but unwanted coupling occurs and performance decreases
Solution Approach 1:
A magnetic shielding plate is introduced as an intermediary component between the antenna coil and surrounding components. This shielding plate selectively blocks magnetic field lines to prevent unwanted coupling with adjacent components while allowing the antenna to maintain its desired position for space efficiency. The shielding plate acts as a mediator that protects the antenna system from harmful electromagnetic interference.
2Reliability
If the antenna coil is positioned to achieve desired hot spot location, then communication performance is improved, but available space for installation is reduced
Solution Approach 1:
The solution extends the problem from two-dimensional plane placement to three-dimensional spatial arrangement by introducing a magnetic shielding plate positioned at a specific distance and orientation relative to the antenna coil. This allows the hot spot to be positioned at a desired location in 3D space while maintaining compact overall device dimensions through vertical layering of components.
3Power
If the hot spot is positioned above the antenna coil, then magnetic field strength is maximized, but flexibility in positioning is reduced
Solution Approach 1:
The magnetic shielding plate can be positioned at different distances and orientations relative to the antenna coil, allowing dynamic adjustment of the hot spot position. By varying the shielding plate's position, the system can optimize between maximum magnetic field strength (when shielding plate is farther away) and desired positioning flexibility (when shielding plate is closer or oriented differently).
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 enables the hot spot to be reliably positioned at a desired location, increasing flexibility in antenna coil placement and improving communication performance by adjusting the hot spot's position and expanding its area, thus overcoming the challenges of space constraints and unwanted coupling.
Implementation Method 1
The main coil antenna and the sub-coil antenna are wound so as to generate magnetic fields having opposite phases
Implementation Method 2
A coil opening of the sub-coil antenna and a coil opening of the main coil antenna are arranged side by side in plan view so that the main coil antenna and the sub-coil antenna are magnetically coupled to each other
Data Source
AI summary
In order to increase flexibility regarding a disposition of an antenna coil and to enable a hot spot to be provided at a desired position, an antenna device includes a main coil antenna and a sub-coil antenna connected to the main coil antenna. A coil opening of the sub-coil antenna and a coil opening of the main coil antenna are arranged side by side in plan view so that the main coil antenna and the sub-coil antenna are magnetically coupled to each other. The main coil antenna and the sub-coil antenna are wound so as to generate magnetic fields having opposite phases.