Antenna Device Slit Segmentation Inverse Current Control
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Solution Overview
Problem
Conventional antenna devices for portable terminals face challenges in miniaturization due to the inverse current phenomenon, which degrades radiation efficiency, and the need for multiple antennas in different frequency bands complicates the use of internal space efficiently.
Innovation Solution
The antenna device incorporates a circuit board with a conductive layer and an auxiliary board featuring a radiation pattern that partially encloses a slit, allowing the radiation pattern to be disposed close to the conductive layer, thereby controlling current flow and reducing the distance between the radiation pattern and the ground layer, enhancing radiation efficiency and allowing for a thinner design.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If the distance between the ground layer and the radiation pattern is reduced to suppress inverse current phenomenon, then radiation efficiency is improved, but the thickness of the portable terminal increases
Solution Approach 1:
The ground layer is segmented into a first ground layer on the circuit board and a second ground layer on the auxiliary board, separated by a slit. This segmentation allows the radiation pattern to be positioned close to the circuit board while maintaining effective ground separation, reducing the inverse current phenomenon and improving radiation efficiency without increasing terminal thickness.
Solution Approach 2:
The auxiliary board acts as an intermediary structure between the circuit board and the radiation pattern. It provides the second ground layer that works in conjunction with the first ground layer to control current flow paths, enabling close positioning of the radiation pattern to the circuit board while maintaining radiation efficiency.
2Length of stationary object
If a fill cut region is formed to reduce carrier height, then the radiation pattern can be disposed closer to the circuit board, but the use efficiency of the circuit board is degraded
Solution Approach 1:
Instead of creating a fill cut region that removes ground layer area, the ground layer is segmented into two layers on separate boards. This allows the radiation pattern to be positioned over the slit region without removing any circuit board area, maintaining full use efficiency of the circuit board while achieving the desired close positioning.
3Adaptability or versatility
If multiple antenna devices are installed for different frequency bands, then communication functionality is improved, but the internal space of the portable terminal is consumed
Solution Approach 1:
The antenna device combines multiple frequency band capabilities into a single integrated structure. The radiation pattern and ground layer configuration support operation in both first and second frequency bands, eliminating the need for separate antenna devices and reducing the volume occupied by antenna systems while maintaining full communication 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
This configuration maintains stable antenna performance while reducing the thickness of the portable terminal, allowing for efficient use of internal space and improved circuit board utilization, with the ability to operate in multiple frequency bands without the need for a fill cut region.
Implementation Method 1
upon application of a transmission/reception signal to the radiation pattern 23, an induced current is generated on the ground layer 13 in an inverse direction to signal power flowing along the radiation pattern 23
Data Source
Figure 1
Figure 2
Figure 3~4
AI summary
An antenna device for a portable terminal, the antenna device comprising a circuit board and an auxiliary board. The circuit board comprises a conductive layer on a first surface and a slit on the first surface where the conductive layer is not present. The auxiliary board is positioned over the slit and above the first surface of the circuit board. A radiation pattern is formed on the auxiliary board such that the radiation pattern at least partially encloses the slit in the plane of the first surface. Even when a radiation element is disposed on the conductive layer, induced current generated around the slit can be controlled to be in the same direction as the signal power, thereby preventing radiation performance from being degraded by an inverse current phenomenon in spite of the disposition of the radiation element on the conductive layer.