Dual-Antenna Decoupling Structure for High Isolation in Tight Spaces
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Solution Overview
Problem
In wireless communication devices, achieving high isolation and radiation efficiency between compactly arranged dual-antennas in a limited space is challenging, especially when operating at the same frequency, leading to reduced data transmission rates due to increased interference and envelope correlation coefficient.
Innovation Solution
A dual-antenna structure is designed with a decoupling member and radiators, where the tail end of each radiator is grounded, and a neutralization line structure using floating metal technology is implemented to reduce current coupling and improve isolation, allowing for compact arrangement without compromising radiation efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If two antennas are compactly arranged in narrow space, then the device size is reduced, but isolation between antennas deteriorates and coupling increases
Solution Approach 1:
A decoupling member is introduced as an intermediary element between the two radiators. This decoupling member includes a first coupling portion coupled to the first radiator and a second coupling portion coupled to the second radiator, creating an indirect coupling path that reduces direct interference between antennas while maintaining compact arrangement
Solution Approach 2:
The decoupling member is segmented into distinct coupling portions: a first coupling portion for interfacing with the first radiator and a second coupling portion for interfacing with the second radiator. This segmentation allows independent optimization of each interface while maintaining overall decoupling functionality
2Productivity
If two antennas operate at the same frequency and are configured adjacent to each other, then data transmission capability is improved, but envelope correlation coefficient increases and radiation efficiency deteriorates
Solution Approach 1:
The decoupling member serves as a mediator that enables both antennas to operate at the same frequency by providing an indirect coupling mechanism. This reduces the envelope correlation coefficient between antennas while maintaining their radiation efficiency, allowing simultaneous operation without performance degradation
Solution Approach 2:
The coupling strength between antennas is adjusted by modifying the decoupling member's geometry and positioning. By changing physical parameters such as the size and shape of coupling portions, the system achieves optimal balance between maintaining same-frequency operation and minimizing mutual interference
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 achieves high isolation and low envelope correlation coefficient, maintaining good radiation efficiency and communication quality even in narrow spaces, thus enhancing data transmission rates.
Implementation Method 1
The decoupling member is indirectly coupled to the first radiator and the second radiator... so that isolation between the two antennas in a designed frequency band can be improved, current coupling between the two antennas can be effectively reduced
Data Source
AI summary
An electronic device includes a decoupling member, a first radiator, a second radiator, a first feed unit, a second feed unit, and a rear cover. A gap is formed between the first radiator and the second radiator, the decoupling member is indirectly coupled to the first radiator and the second radiator, and the decoupling member is disposed on a surface of the rear cover. The decoupling member does not overlap a first projection, and the first projection is a projection of the first radiator in a first direction. The decoupling member does not overlap a second projection, and the second projection is a projection of the second radiator in the first direction. The first direction is a direction perpendicular to a plane on which the rear cover is located.