Symmetrical Loop Antenna Layout for High Isolation and Low ECC
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Solution Overview
Problem
The challenge of integrating multiple antennas in limited space while ensuring good isolation and a low envelope correlation coefficient (ECC) in electronic devices is unresolved.
Innovation Solution
An antenna unit with a symmetrical loop antenna configuration, utilizing two feeds to self-cancel signals at different ports, achieving high isolation and low ECC, and allowing for flexible placement within limited space.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If a larger quantity of antennas is placed in limited space, then antenna quantity increases, but isolation and ECC performance deteriorate
Solution Approach 1:
The loop antenna is segmented into multiple radiation sections (first, second, third radiation sections) that can be independently configured and grounded. This segmentation allows each section to contribute to different radiation patterns, enabling multiple antenna functions from a single segmented structure, thereby increasing antenna quantity while maintaining isolation through controlled current distribution in each segment
Solution Approach 2:
The antenna unit employs asymmetric grounding configurations where the second and third radiation sections are grounded at different positions and orientations. This asymmetric grounding creates different current paths and radiation patterns for different antenna ports, achieving high isolation between co-located antennas while maintaining low ECC through the asymmetric current distribution
2Reliability
If antenna space is increased, then isolation and ECC performance improve, but device space utilization deteriorates
Solution Approach 1:
Multiple antenna functions are merged into a single loop antenna structure with multiple radiation sections. By combining multiple antenna elements into one integrated loop structure with shared grounding, the patent achieves high isolation and low ECC performance without requiring separate physical spaces for each antenna, thereby improving space utilization while maintaining reliability
Solution Approach 2:
The antenna design utilizes three-dimensional spatial arrangement of radiation sections extending in different directions (first, second, third directions) from a common grounding point. This dimensional approach allows multiple antenna functions to be packed into a compact volume by exploiting spatial diversity in current paths and radiation patterns, achieving high isolation without increasing the overall footprint area
Data Source
AI summary
This application provides an antenna unit and an electronic device. A signal at a C-mode port and a signal at a D-mode port of a same loop antenna in any antenna unit are respectively excited by using two feeds, and the antenna unit is electrically symmetrically disposed, so that the signal at the C-mode port is self-cancelled at the D-mode port, and the signal at the D-mode port is self-cancelled at the C-mode port, to implement signal isolation between the two ports and interference self-cancel, and the signal at the C-mode port and the signal at the D-mode port can be complementary to each other in different radiation directions, to implement two antennas with high isolation and a low envelope correlation coefficient ECC based on the same loop antenna.