Radio Communication Device with Slit Patterns in Metal Casing
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Solution Overview
Problem
In radio communication devices with metal casings, the planar coil antenna is shielded by the metal surface due to induced currents, leading to reduced communication performance and mechanical strength issues when trying to apply existing antenna designs.
Innovation Solution
A radio communication device with a planar coil antenna and slit patterns on the metal body structural material, where the first slit patterns intersect the coil pattern at multiple locations and the second slit patterns are along the outer edge, reducing induced currents and maintaining mechanical strength.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a planar coil antenna is disposed parallel to a plate conductor to enable communication, then communication function is achieved, but eddy currents are induced in the plate conductor causing signal cancellation and reduced communication performance
Solution Approach 1:
The plate conductor is segmented by forming slits that divide the continuous metal surface into separate regions. These slits interrupt the path of eddy currents, preventing large-scale current loops that would otherwise cancel the antenna signal. The segmentation allows the antenna to maintain communication functionality while reducing harmful eddy current effects.
Solution Approach 2:
The invention converts the harmful eddy current effect into a beneficial configuration by strategically positioning slits to control current flow paths. The slits are designed to guide eddy currents along specific trajectories that minimize signal cancellation, effectively transforming the unavoidable eddy current phenomenon into a manageable aspect of the antenna system design.
2Reliability
If a slit is formed in the plate conductor to reduce eddy current, then communication performance is improved, but the mechanical strength of the plate conductor decreases
Solution Approach 1:
Instead of forming slits across the entire plate conductor, the invention applies slits only in specific local regions where they are most effective at reducing eddy currents. The slits are positioned to intersect the coil pattern at critical locations while avoiding areas where they would significantly compromise structural integrity. This localized approach maintains overall mechanical strength while achieving the desired electromagnetic performance.
3Reliability
If the slit is formed in the outer periphery of the plate conductor to reduce eddy current, then communication performance is improved, but it becomes difficult to apply to metal casings without decreasing mechanical strength
Solution Approach 1:
The invention positions slits in the inner region of the plate conductor, away from the outer periphery, allowing the outer edges to maintain their structural integrity. This configuration enables the antenna device to be applied to metal casings and structural components without compromising their mechanical strength, while still achieving effective eddy current reduction through strategically positioned internal slits.
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 communication performance by minimizing eddy current cancellation and maintaining mechanical strength, allowing for increased communication distance without compromising the device's structural integrity.
Implementation Method 1
since a planar coil antenna included in the terminal faces a metal surface, an induced current (eddy current) flows through the metal surface so as to cancel a signal current in the planar coil
Implementation Method 2
an induced current (eddy current) flows through the metal surface
Implementation Method 3
the first slit pattern not being connected to an edge portion of the body structural material... an induced current which cancels a magnetic field generated by the coil antenna is less likely to flow through the body structural material
Data Source
AI summary
A radio communication device includes a body structural material such as a metal casing, a planar coil antenna which is disposed inside the body structural material so as to face the body structural material and includes a coil pattern and a coil opening, and a first slit pattern which is provided in the body structural material, intersects the coil pattern at at least two locations on the coil pattern in a plan view, and is not connected to an edge portion of the body structural material. Thus, mechanical strength is ensured, and predetermined communication performance is ensured.