Ultra-low-profile Triaxial Antenna with Segmented Magnetic Core
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Solution Overview
Problem
Existing triaxial antennas are unable to achieve ultra-low-profile integration in mobile phones due to thickness limitations, while maintaining sensitivity and bending resistance, as they either break during production or have reduced sensitivity in the Z-axis.
Innovation Solution
A triaxial low-frequency antenna with a magnetic core and orthogonal windings, where the Z-winding is surrounded by corner protuberances and a thin soft-magnetic sheet increases the exposed surface area, enhancing Z-axis sensitivity without increasing thickness, and using a combination of magnetic core and soft-magnetic sheets for improved bending resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a perimetric recess is included in the magnetic core to define the Z-winding channel, then the Z-winding sensitivity is improved, but the magnetic core breaks during unmoulding or machining operations
Solution Approach 1:
The magnetic core is segmented into a main body and four separate corner protuberances. The corner protuberances are positioned at the corners of the magnetic core and define the Z-winding channel collectively, rather than having a single perimetric recess. This segmentation allows the Z-winding channel to be formed without requiring deep recesses that would compromise the structural integrity of the magnetic core during manufacturing.
2Length of stationary object
If the magnetic core thickness is reduced to achieve ultra-low-profile integration, then the antenna thickness is reduced, but the bending resistance deteriorates
Solution Approach 1:
The antenna employs a composite structure combining a magnetic core with four corner protuberances made of magnetic material, and a non-magnetic support structure that extends beneath the magnetic core. This composite design provides mechanical reinforcement through the support structure, improving bending resistance while maintaining the ultra-thin profile of the active magnetic components.
3Measurement precision
If corner protuberances are added to define the Z-winding channel, then the Z-winding sensitivity is improved, but the device complexity increases
Solution Approach 1:
The corner protuberances are merged with the main magnetic core body to form a single integrated magnetic component. The protuberances are positioned at the corners and extend along the Z-axis, collectively defining the Z-winding channel. This merging approach increases Z-winding sensitivity while minimizing the increase in device complexity, as the corner protuberances are simple geometric additions rather than separate 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
The solution achieves a thickness of less than 1.65 mm, maintaining sensitivity over 50 mV/Amv in the Z-axis and improving bending resistance, making it suitable for integration in mobile phones.
Implementation Method 1
X-winding, Y-winding and Z-winding of conductive wire orthogonal to one another wound around X-axis, Y-axis and Z-axis orthogonal to each other surrounding said magnetic core
Implementation Method 2
a thin soft-magnetic sheet increases the exposed surface area, enhancing Z-axis sensitivity
Data Source
AI summary
An antenna including a magnetic core made of a soft-magnetic non-electro conductive material, including four corner protuberances defining two orthogonal winding channels around the magnetic core; X-winding (DX), Y-winding (DY) and Z-winding (DZ) of conductive wire orthogonal to one another wound around the magnetic core, wherein the antenna further has a first soft magnetic sheet attached superimposed on said four corner protuberances of the magnetic core providing a limiting edge for the Z-winding (DZ), so that an increase of the sensitivity of the Z-winding (DZ) and a reduced thickness of the antenna in the Z-axis (Z) direction are obtained.