Coil Antenna With Thickness-Direction Magnetic Components
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
In portable electronic devices with non-contact IC cards, the communication distance is reduced and sensitivity varies due to the presence of circuit substrates and metal components, making it difficult for magnetic flux to pass through, especially when the device is held upside down.
Innovation Solution
A coil antenna design with strategically placed magnetic components extending in the thickness direction of the device casing, including a first magnetic component and additional components on opposing surfaces, to enhance magnetic flux convergence and stability, allowing communication from any orientation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a planar coil is disposed in the surface of the casing, then the structure is simple, but the communication distance is reduced and sensitivity varies with orientation
Solution Approach 1:
The patent transitions from a two-dimensional planar coil to a three-dimensional coil structure that extends in the thickness direction of the casing. This dimensional change allows the magnetic flux to pass through the coil from both front and back surfaces, enabling stable communication regardless of the device's orientation relative to the reader/writer.
Solution Approach 2:
The patent introduces magnetic components with high magnetic permeability at specific locations (front surface, back surface, and internally) to locally enhance magnetic flux convergence. These magnetic components are strategically positioned to guide and concentrate magnetic flux through the coil winding, improving communication reliability in specific orientation scenarios.
2Reliability
If magnetic material sheet is disposed between coil antenna and object, then communication is improved from one side, but communication fails from the opposite side
Solution Approach 1:
The patent adds magnetic components in the thickness direction (third dimension) of the casing, specifically placing magnetic components at both the front surface and back surface. This enables the magnetic flux to converge through the coil regardless of whether the reader/writer approaches from the front or back, achieving omnidirectional communication capability.
Solution Approach 2:
The patent combines multiple magnetic components (front surface magnetic component, back surface magnetic component, and internal magnetic component) to work together in unison. This combination creates a comprehensive magnetic flux convergence system that operates effectively from all orientations, merging the functions of individual magnetic components into a unified solution.
3Adaptability or versatility
If circuit substrate and metal components are disposed inside the device, then the device functionality is complete, but magnetic flux passage is blocked
Solution Approach 1:
The patent introduces magnetic components with high magnetic permeability at specific locations to locally create favorable magnetic flux passage paths. These magnetic components are positioned to guide magnetic flux around or through regions with circuit substrates and metal components, reducing their obstructive effect on magnetic flux while maintaining device functionality.
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 design increases communication distance and stability by improving magnetic flux convergence, enabling reliable communication with a reader/writer regardless of the device's orientation and reducing the impact of internal components on magnetic permeability.
Implementation Method 1
a magnetic component extending at least in the thickness direction of the casing and defining a magnetic path from the first principal surface side to the second principal surface side
Implementation Method 2
a coil component surrounding the magnetic component in the casing
Data Source
AI summary
A coil antenna structure includes a first magnetic component extending in the thickness direction of a tabular primary casing. A second magnetic component and a third magnetic component, which are magnetically connected to the first magnetic component, are disposed on the first principal surface side and the second principal surface side of the primary casing, respectively. The first magnetic component is provided with a coil component surrounding it. In this manner, a U-shaped magnetic path is provided at an end portion of the primary casing so as to detour around a substrate defining an internal conductor. Likewise, a U-shaped magnetic path including fourth to sixth magnetic components is provided in a secondary casing defining a clamshell type casing together with the primary casing so as to detour around a substrate defining as an internal conductor.