Antenna Device With Nested Magnetic Core For Coupling
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Solution Overview
Problem
Existing RFID and NFC antenna devices face challenges in maintaining communication range without increasing device size, as the width of the magnetic core determines antenna performance, and increasing coil turns or magnetic flux loop width leads to larger coil areas and reduced coupling efficiency.
Innovation Solution
The antenna device incorporates a first coil wound in one direction and a second coil wound oppositely, with a magnetic core inserted into their conductor openings, allowing for a larger magnetic flux loop width without increasing the coil's outer dimensions, and a metallic body is positioned on the magnetic core's second main surface to concentrate flux, enhancing coupling efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the width of the magnetic core is increased to improve antenna performance and communication range, then the coefficient of coupling is improved, but the size of the antenna device and communication terminal apparatus increases
Solution Approach 1:
The magnetic core is inserted into the conductor opening formed by the coil, nesting the magnetic core within the coil structure. This allows the magnetic flux to be concentrated within the existing coil area without increasing the overall antenna device size, thereby improving the coefficient of coupling while maintaining compact dimensions.
Solution Approach 2:
The invention utilizes the vertical dimension by inserting the magnetic core into the conductor opening along the axis perpendicular to the coil plane. This dimensional approach allows the magnetic flux loop to extend vertically through the magnetic core, increasing the effective magnetic path length and coupling efficiency without expanding the horizontal footprint of the antenna.
2Reliability
If the number of coil turns is increased to improve magnetic flux and communication range, then the magnetic flux loop width is improved, but the coil area increases and coupling efficiency is reduced
Solution Approach 1:
The invention changes the parameter of magnetic flux concentration by introducing the magnetic core with specific magnetic permeability properties. This allows the magnetic flux to be concentrated and guided through the magnetic core, achieving improved magnetic flux loop width and coupling efficiency without needing to increase the coil area or number of turns.
3Reliability
If the coil area is increased to accommodate more turns or larger magnetic flux loop, then the communication range is improved, but the device size increases
Solution Approach 1:
The magnetic core is positioned locally within the conductor opening of the coil, creating a region of high magnetic permeability where the magnetic flux is concentrated. This localized improvement in magnetic properties enhances the coupling efficiency and communication range without requiring an increase in the overall device size, as the enhancement is achieved in the specific region where the magnetic core is inserted.
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 increases the maximum communication range by enhancing the coefficient of coupling, achieving a 7% improvement over existing designs while maintaining the antenna's size, thus securing a required communication range without enlarging the device.
Implementation Method 1
a magnetic core inserted into the conductor opening of the first coil and the conductor opening of the second coil
Implementation Method 2
enhancing the coefficient of coupling
Data Source
AI summary
An antenna device includes a first coil wound in one direction and a second coil disposed adjacent to the first coil and wound in a direction opposite to the winding direction of the first coil and having conductor openings at the centers of wound coils, and a magnetic core. The magnetic core is inserted into the conductor opening of the first coil and the conductor opening of the second coil. A portion of a conductor line forming the first coil positioned farther away from the second coil than a portion of the conductor line forming the first coil positioned closer to the second coil, and a portion of a conductor line forming the second coil positioned farther away from the first coil than a portion of the conductor line forming the second coil positioned closer to the first coil, are disposed along the first main surface of the magnetic core.