Loop-like Dual-Antenna System Isolation
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Solution Overview
Problem
In 5G communication, dual-antenna systems face challenges in achieving high isolation and efficient radiation within a limited space due to the need for increased spacing or additional decoupling elements, which compromises the overall size and integration of the antenna structure.
Innovation Solution
A loop-like dual-antenna system design where two signal sources share a loop radiating element, with the position of current nulls from one signal source aligning with maximum current areas excited by the other, enhancing isolation and reducing the overall size while maintaining good radiation characteristics.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the spacing between dual antennas is increased to improve isolation, then the isolation between antennas is improved, but the overall size of the antenna structure increases
Solution Approach 1:
A decoupling element is introduced as an intermediary component between the two antennas. This decoupling element acts as a mediator that reduces mutual coupling and improves isolation between the antennas without requiring increased spacing, thereby maintaining a compact overall structure while achieving the desired isolation performance.
Solution Approach 2:
The decoupling element is positioned in a spatial dimension between the two antennas, utilizing the third dimension (height/depth) rather than only increasing the planar spacing. This allows isolation improvement without expanding the footprint area, effectively using dimensional transition to resolve the contradiction between isolation and size.
2Ease of manufacture
If decoupling elements are added between dual-antenna units to improve isolation, then the isolation between antennas is improved, but the device complexity and overall size increase
Solution Approach 1:
The decoupling element is designed to be integrated within or between the existing antenna structures, effectively nesting the decoupling function within the antenna assembly. This nested configuration improves isolation without significantly increasing external dimensions or structural complexity, as the decoupling element shares space with the antenna units.
3Volume of moving object
If the antenna design space is shrunk to accommodate multiple antennas, then the portability is improved, but the isolation and radiation efficiency deteriorate
Solution Approach 1:
The antenna design utilizes thin-film or planar structures that can be flexibly configured within limited space. The decoupling element and antenna elements are designed as thin, integrated structures that maintain effective isolation and radiation performance while occupying minimal volume, enabling compact antenna design without sacrificing 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
The loop-like dual-antenna system achieves improved isolation and compact size, suitable for small electronic devices, with S-parameter results showing better than 30 dB isolation and less than -10 dB reflection coefficients in the 2.4 GHz band, ensuring effective radiation and orthogonal polarization.
Implementation Method 1
a loop radiating element, disposed on the first surface of the dielectric substrate, the loop radiating element includes a first radiating part with two ends and a second radiating part opposite to the first radiating part
Implementation Method 2
a coupling matching element, disposed on the second surface of the dielectric substrate and adjacent to the grounding part, for coupling to and exciting the second radiating part
Data Source
AI summary
A loop-like dual-antenna system is provided. The loop-like dual-antenna system includes a dielectric substrate having a first surface and a second surface opposite to each other. The loop radiating element includes a first radiating part with two ends and a second radiating part opposite to the first radiating part. A first signal source is disposed on the first surface of the dielectric substrate and electrically connected to two ends of the first radiating part. A grounding part is disposed on the second surface of the dielectric substrate and disposed on one side of the dielectric substrate away from the first signal source. A coupling matching element is disposed on the second surface of the dielectric substrate and adjacent to the grounding part, for coupling to and exciting the second radiating part. A second signal source, disposed on the second surface of the dielectric substrate, and electrically connected to the coupling matching element and the grounding part.