Asymmetric MIMO Antenna Decoupling for Improved Isolation
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Solution Overview
Problem
The challenge of reducing mutual coupling and improving isolation between closely spaced MIMO antenna elements in wireless communication devices due to limited space, which affects the performance of MIMO systems.
Innovation Solution
An asymmetric MIMO antenna structure with a connection structure that includes extendable series and parallel stubs and capacitors to adjust impedance, allowing for decoupling and improved isolation between antenna elements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If MIMO antenna elements are deployed closely to improve spectrum utilization and spatial efficiency, then device miniaturization is achieved, but mutual coupling between antennas increases and isolation between MIMO antennas decreases
Solution Approach 1:
A connection structure including series stubs and parallel stubs is introduced as an intermediary between the first and second antenna elements. This connection structure acts as a decoupling mechanism that reduces mutual coupling while allowing the antenna elements to be closely spaced, thereby maintaining both device miniaturization and adequate antenna isolation.
Solution Approach 2:
The connection structure utilizes adjustable electrical parameters including variable capacitors and variable inductors to dynamically control the coupling characteristics between antenna elements. By changing these electrical parameters, the system can optimize isolation performance while maintaining compact physical dimensions.
2Ease of manufacture
If antenna elements are placed close together to reduce device size, then manufacturing cost is reduced, but coupling between elements increases affecting MIMO performance
Solution Approach 1:
The connection structure serves as a mediating element between closely spaced antenna elements, enabling compact manufacturing while actively managing and reducing the harmful mutual coupling effects through its decoupling circuitry.
Solution Approach 2:
The connection structure converts the harmful mutual coupling effect into a beneficial decoupling mechanism by using the close proximity of antenna elements to its advantage, where the connection structure's design transforms the coupling interaction into a means of achieving isolation through controlled impedance matching and reactive cancellation.
3Reliability
If connection structure is added to reduce coupling, then isolation between antenna elements improves, but device complexity increases
Solution Approach 1:
The connection structure merges multiple functions including decoupling, impedance matching, and tuning capabilities into a single integrated circuitry between the antenna elements, reducing overall device complexity while achieving improved isolation performance.
Solution Approach 2:
The connection structure is designed with multi-functionality, serving as both a decoupling mechanism and an impedance tuning network, thereby achieving multiple performance improvements with a single structural addition rather than requiring separate components for each function.
Data Source
AI summary
An antenna and a communication device are provided. The antenna includes a first antenna element, a second antenna element, and a connection structure. The first antenna element and the second antenna element each have a feed point. The connection structure connects the first antenna element to the second antenna element. The connection structure is extendable in a direction perpendicular to a connection direction of the first antenna element and the second antenna element. The connection structure adjusts isolation between the first antenna element and the second antenna element through extension.