Antenna Isolation in Compact Electronic Devices
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Solution Overview
Problem
In miniature electronic devices, the limited space and stringent SAR value compliance lead to poor isolation between antennas, compromising communication quality.
Innovation Solution
The electronic device positions the transmitting antenna adjacent to the touch screen and the receiving antenna adjacent to the first back cover, utilizing a single feeding structure to reduce space and enhance isolation, allowing for improved communication efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple antennas are built in the electronic device to support various communication functions, then communication functionality is improved, but isolation between antennas deteriorates due to limited space
Solution Approach 1:
The patent utilizes the third dimension (depth/thickness) of the device by placing the transmitting antenna adjacent to the touch screen (front side) and the receiving antenna adjacent to the back cover (back side). This spatial arrangement in different dimensions achieves good antenna isolation while maintaining compact form factor, resolving the contradiction between supporting multiple communication functions and maintaining antenna isolation.
2Object-affected harmful factors
If antenna disposition space is reduced to comply with SAR standards, then SAR compliance is improved, but antenna isolation deteriorates
Solution Approach 1:
By arranging antennas in different spatial dimensions (front and back of the device), the patent achieves both SAR compliance through reduced antenna disposition space and maintains good antenna isolation, eliminating the trade-off between these two requirements.
Solution Approach 2:
The patent divides the antenna system into separate transmitting and receiving antenna units positioned at different locations and orientations within the device. This segmentation allows each antenna to be optimized for its specific function while maintaining isolation from the other, achieving both SAR compliance and communication quality.
3Volume of moving object
If transmitting antenna and receiving antenna are positioned close together to save space, then device compactness is improved, but communication quality deteriorates due to poor isolation
Solution Approach 1:
The patent achieves compact device design by utilizing three-dimensional space efficiently, placing antennas on opposite sides of the device (front and back). This dimensional arrangement maintains good isolation between antennas while achieving compact form factor, resolving the contradiction between device compactness and communication quality.
Data Source
AI summary
An electronic device including a touch screen, a first back cover, a transmitting antenna and a receiving antenna is provided. The first back cover includes a frame and a cover body. The transmitting antenna is adjacent to an edge of the touch screen and has a feeding point for receiving a feeding signal. The receiving antenna is adjacent to the cover body of the first back cover and is electrically connected to a ground plane. The receiving antenna and the transmitting antenna are spaced apart by a coupling distance, and a signal from the receiving antenna is transmitted to the feeding point through the coupling distance and the transmitting antenna.