Antenna Ground Segmentation for Low-Band Interference Reduction
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Solution Overview
Problem
Interference between multiple antennas in electronic devices, particularly in frequency bands below 1 GHz, reduces total radiated power (TRP) due to omni-directionality.
Innovation Solution
The electronic device incorporates a display, a back plate, a support member, and printed circuit boards with antennas connected to different ground regions, allowing the first antenna to be electrically connected to a ground region on the printed circuit board and the second antenna to a ground region on the support member or display, thereby reducing interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple antennas are arranged in an electronic device to improve communication performance, then the communication capability is enhanced, but interference between antennas occurs reducing total radiated power
Solution Approach 1:
The ground system is segmented into multiple independent ground regions (first ground region on PCB, second ground region on support member, third ground region on display) that are electrically isolated from each other. Each antenna is connected to a different ground region, which divides the ground system into separate zones that prevent interference between antennas while maintaining individual antenna performance.
2Device complexity
If antennas are connected to common ground to simplify the structure, then the device complexity is reduced, but interference between antennas increases
Solution Approach 1:
The ground connection structure is segmented into multiple independent ground regions distributed across different components (PCB, support member, display). This segmentation maintains structural simplicity while eliminating interference by ensuring each antenna has its own dedicated ground region, thus resolving the contradiction between simplicity and performance.
Solution Approach 2:
The ground regions are distributed across different spatial dimensions and physical components rather than being confined to a single plane or component. The first ground region is on the PCB, the second on the support member, and the third on the display, creating a three-dimensional ground distribution that reduces coupling between antennas.
Data Source
AI summary
An electronic device is provided that includes a display disposed to face a first direction, a back plate disposed to face a second direction opposite to the first direction, a support member disposed below the display and configured to be coupled with the display, a printed circuit board disposed between the support member and the back plate, and a first antenna and a second antenna disposed between the printed circuit board and the back plate and configured to emit signals in a radio frequency band, and the first antenna is electrically connected to a first ground region included in the printed circuit board, and the second antenna may be electrically connected to a second ground region included in the support member.