Terminal Antenna Shared Ground Layout for Lower Mutual Coupling
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
The increasing number of antennas in electronic devices, particularly in mobile phones, leads to mutual interference due to limited space, degrading antenna performance, especially when one antenna's ground point is near another's large electric field point, affecting radiation efficiency and bandwidth.
Innovation Solution
A terminal antenna system with a shared ground design and a distributed capacitor structure is implemented, where two adjacent antennas share a ground point and utilize a distributed capacitor to excite different modes, increasing bandwidth and reducing interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If antennas are disposed adjacently to increase antenna density, then the number of antennas per unit area increases, but mutual interference between antennas increases and antenna performance degrades
Solution Approach 1:
The ground point of the first antenna is extracted and separated from its traditional position near the feed point, and relocated to a position away from the large electric field point. This extraction eliminates the harmful interaction between the ground point and the large electric field, reducing mutual interference while maintaining compact antenna spacing
Solution Approach 2:
A feeding network is introduced as an intermediary component to control the current distribution on the radiating elements. The feeding network enables independent control of each antenna element, allowing the ground point to be positioned optimally away from the large electric field point while maintaining proper feeding and reducing mutual coupling effects
2Device complexity
If the ground point is positioned near the large electric field point to simplify structure, then structural complexity is reduced, but radiation efficiency decreases and bandwidth is limited
Solution Approach 1:
Different portions of the antenna structure are assigned different functions: the feed point area handles signal input while the ground point is deliberately positioned in a region away from the large electric field point. This local differentiation optimizes the electromagnetic characteristics at each location, improving radiation efficiency without significantly increasing overall structural complexity
Solution Approach 2:
The feeding network provides dynamic control over the current distribution on the radiating elements. By adjusting the feeding parameters, the current distribution can be optimized to enhance radiation efficiency while maintaining the improved ground point positioning, allowing adaptive optimization without structural changes
3Area of stationary object
If antennas are placed closer together to save space, then space utilization improves, but mutual coupling increases and performance degrades
Solution Approach 1:
The ground point is extracted from its conventional position near the feed point and relocated to a position away from the large electric field point. This extraction reduces the coupling between adjacent antennas by removing the primary source of mutual interference, enabling closer antenna spacing without significant performance degradation
Solution Approach 2:
The feeding network enables independent control of current distribution parameters on each radiating element. By optimizing these current distribution parameters, the mutual coupling between closely spaced antennas is reduced, allowing compact antenna arrangements while maintaining acceptable performance levels
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 design enhances radiation efficiency and bandwidth by minimizing interference between adjacent antennas, improving communication performance on multiple frequency bands.
Implementation Method 1
a new mode can be further excited through a distributed capacitor design, to increase bandwidth of a single-frequency antenna
Data Source
Figure 1
Figure 2
Figure 3~4(b)
AI summary
Embodiments of this application relate to the field of antenna technologies, and disclose a terminal antenna system and an electronic device, to effectively reduce mutual impact between adjacent antennas. A specific solution is as follows: The terminal antenna system includes: a first radiator and a second radiator, where a first end of the first radiator is coupled to a first end of the second radiator through a gap. A first feed point is provided at a second end, away from the second radiator, of the first radiator, and a first ground point is further provided on the first radiator. A second feed point is provided at a second end of the second radiator, and the second end of the second radiator is an end away from the first radiator.