Asymmetric MIMO Antenna System for Mobile Terminals
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
The MIMO antenna system in mobile terminals exhibits poor performance in the low frequency band due to near-field coupling and limited space, resulting in low efficiency and high correlation between antennas.
Innovation Solution
The antenna system consists of a first antenna with an electrical length equal to its resonant length for transmitting and receiving data, and a second antenna with an electrical length less than its resonant length for receiving data only, both positioned on the short side of the electronic apparatus, minimizing near-field coupling and maximizing efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If two antennas are placed close together in limited space, then the device can support MIMO technology, but near-field coupling occurs and antenna efficiency decreases
Solution Approach 1:
The patent applies local quality by making the two antennas asymmetric in design - the first antenna has a resonant electrical length while the second antenna has a non-resonant electrical length. This creates different local characteristics for each antenna position, reducing mutual coupling while maintaining MIMO functionality in limited space
Solution Approach 2:
The patent implements asymmetry by designing the antennas with different electrical lengths relative to their resonant lengths. The first antenna operates at resonance while the second operates below resonance, creating an asymmetric configuration that reduces near-field coupling and improves overall system performance in constrained spaces
2Area of stationary object
If two antennas are placed close together, then space is saved, but correlation between antennas increases
Solution Approach 1:
By assigning different electrical length characteristics to each antenna position, the patent creates local quality differences that reduce correlation between antennas even when placed close together, preserving MIMO performance while minimizing device footprint
Solution Approach 2:
The asymmetric design where one antenna is resonant and the other is non-resonant creates different radiation patterns and impedance characteristics, reducing antenna correlation and enabling effective MIMO operation in compact form factors
3Length of moving object
If antenna length is reduced to save space, then device size decreases, but antenna efficiency and bandwidth coverage deteriorate
Solution Approach 1:
The patent changes the electrical length parameter of the second antenna to be less than its resonant length, and adjusts its positioning, to achieve efficient operation in a compact form factor without sacrificing overall system performance
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 configuration improves the overall performance of the antenna system by reducing mutual interference, enhancing data transmission efficiency, and allowing for a broader bandwidth coverage while accommodating a larger display screen and minimizing battery interference.
Implementation Method 1
The first antenna has an electrical length that is equal to its resonant electrical length
Implementation Method 2
a near-field coupling between the two antennas is strong
Data Source
AI summary
The present disclosure discloses an antenna system that includes a first antenna for transmitting and receiving data and having an electrical length that is equal to its resonant electrical length; a second antenna for receiving data and having an electrical length that is less than its resonant electrical length. The present disclosure also discloses a corresponding electronic apparatus.