Orthogonal Erected PCB Antenna for Mobile Terminals
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Solution Overview
Problem
Built-in PCB antennas in mobile terminals suffer from deteriorated radiation performance due to a shorter distance between the antenna and the human body, leading to increased absorption of electromagnetic waves.
Innovation Solution
A built-in PCB antenna design featuring a main PCB with a power feeding line and a first antenna pattern, along with an erected PCB orthogonally attached, which includes a second antenna pattern and protrusions for electrical connection, ensuring a longer distance from the antenna to the human body and reducing absorption of electromagnetic waves.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a built-in PCB antenna is used instead of a carrier antenna, then cost is reduced and integration is improved, but radiation performance deteriorates due to shorter distance from the antenna to the human body
Solution Approach 1:
The patent applies dimensionality change by erecting the second PCB vertically (orthogonally) relative to the main PCB, transitioning from a planar two-dimensional layout to a three-dimensional structure. This vertical positioning increases the distance between the antenna and the human body, thereby improving radiation performance while maintaining the cost benefits of built-in PCB antenna integration
2Volume of moving object
If the antenna is positioned closer to the human body, then device size is reduced, but electromagnetic wave absorption by the human body increases
Solution Approach 1:
By utilizing the vertical dimension through the erected PCB configuration, the patent achieves increased separation distance between the antenna and human body without proportionally increasing the overall device footprint, thus mitigating electromagnetic wave absorption while maintaining compact device size
3Ease of manufacture
If a flat PCB antenna layout is used, then manufacturing is simplified, but the non-ground region requirement limits installation area for metal parts
Solution Approach 1:
The vertical erection of the second PCB creates additional three-dimensional space, effectively increasing the available installation area for metal parts and other components without complicating the manufacturing process, as the orthogonal configuration maintains standard PCB fabrication techniques
Data Source
AI summary
A built-in Printed Circuit Board (PCB) antenna of a mobile terminal is erected to guarantee a sufficient distance from a human body. The built-in PCB antenna includes a main PCB having a power feeding line and a first antenna pattern having a power feeding antenna line having an end electrically connected to the power feeding line, through-holes formed at an end of the main PCB and having a conduction hole electrically connected to the first antenna pattern, an erected PCB fixed on the main PCB orthogonally and having a second antenna pattern formed thereon, and protrusions formed at a lateral side of the erected PCB and having a conduction protrusion, inserted into the conduction hole, electrically connected to an end of the second antenna pattern. The built-in PCB antenna may reduce deterioration of radiation performance caused by a body of a user.