Double-Frequency Antenna With Folded Isolation Plates
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Solution Overview
Problem
Miniaturized MIMO wireless communication devices face mutual interference issues due to the close proximity of antennas, which existing methods like inserting metal sheets do not completely resolve.
Innovation Solution
The implementation of a double-frequency antenna structure that includes a dielectric substrate with first and second sets of antenna arrays, and the use of first and second folded isolation plates made of electric conductive material to increase isolation between the antennas, with the plates positioned between the antenna arrays to block electric lines and reduce mutual coupling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If metal sheets are inserted between antennas to increase isolation, then isolation between antennas is improved, but the isolation is not complete and mutual interference remains
Solution Approach 1:
The isolation structure is divided into multiple segments: a first folded isolation plate extending from the first antenna array and a second folded isolation plate extending from the second antenna array. These segmented isolation structures work together to provide complete isolation, overcoming the limitation of a single metal sheet that cannot achieve complete isolation.
Solution Approach 2:
The isolation plates are folded along multiple axes to create three-dimensional isolation structures. The first isolation plate is folded along a first axis and the second isolation plate is folded along a second axis, creating isolation in multiple spatial dimensions rather than just a single flat barrier.
2Volume of moving object
If the distance between multiple antennas is reduced to miniaturize devices, then device size is reduced, but mutual interference problems occur
Solution Approach 1:
Instead of increasing the horizontal distance between antennas (which would increase device size), the patent introduces vertical isolation elements that extend upward from the antenna arrays. This allows antennas to remain close horizontally while achieving effective isolation through the vertical dimension.
Solution Approach 2:
The folded isolation plates act as intermediary structures between the two antenna arrays. These isolation plates are positioned between the antennas and extend vertically, serving as mediators that block electromagnetic interference while allowing the antennas to maintain close proximity for miniaturization.
3Reliability
If conventional metal sheets are used for isolation, then some isolation is achieved, but the isolation degree is insufficient compared to folded isolation plates
Solution Approach 1:
The isolation system is segmented into multiple functional components: a first folded isolation plate associated with the first antenna array and a second folded isolation plate associated with the second antenna array. Each plate is independently folded and positioned, allowing for optimized isolation performance without requiring a single complex structure.
Solution Approach 2:
The isolation plates are folded to create curved and angled surfaces rather than flat planes. The folding creates multiple surfaces at different orientations that collectively provide superior isolation performance, utilizing geometric curvature to enhance the isolation effect.
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 solution significantly increases the degree of isolation between the antenna arrays, achieving up to −10 dB improvement in isolation when compared to conventional structures with metal sheets, and further enhances isolation when additional folded isolation plates are used.
Implementation Method 1
the use of first and second folded isolation plates made of electric conductive material to increase isolation between the antennas, with the plates positioned between the antenna arrays to block electric lines and reduce mutual coupling
Data Source
AI summary
A double-frequency antenna structure with a high degree of electrical isolation between long distance and short distance antennas includes a dielectric substrate having at least two corners and a center area. A first set of antenna arrays is positioned at the corners. A second set of antenna arrays is positioned at the center area. At least one first folded isolation plate is mounted on the dielectric substrate, and positioned between the first set of antenna arrays and the second set of antenna arrays. At least one second folded isolation plate each is mounted on one first folded isolation plate.