Multi-band MIMO Antenna Miniaturization via Resonant Passive Elements
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Solution Overview
Problem
Multi-band compatible MIMO antennas face challenges in miniaturization due to the need for large distances between antenna elements to reduce interconnection, limiting their compactness and integration in communication devices.
Innovation Solution
Incorporating passive elements that resonate at specific frequency bands between antenna elements, reducing the interconnection distance and allowing for miniaturization by enabling electromagnetic coupling while maintaining compatibility with multiple frequency bands.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the distance between antenna elements is increased to reduce interconnection, then the multi-band compatibility is improved, but the device size increases and miniaturization is prevented
Solution Approach 1:
The patent introduces passive elements as intermediary components between the antenna elements. These passive elements resonate at specific frequency bands and mediate the electromagnetic coupling between antenna elements, allowing the elements to be positioned closer together while maintaining proper isolation and multi-band functionality. This resolves the contradiction by enabling miniaturization without sacrificing multi-band compatibility.
2Volume of moving object
If the distance between antenna elements is decreased to enable miniaturization, then the device size is reduced, but the interconnection between antenna elements increases
Solution Approach 1:
Passive elements are positioned between antenna elements to act as intermediaries that control and reduce harmful electromagnetic coupling. These elements resonate at specific frequencies and create controlled impedance transformations that isolate the antenna elements from each other, allowing close spacing while minimizing interconnection effects.
Solution Approach 2:
The patent utilizes resonance frequency parameters of passive elements to dynamically control electromagnetic coupling. By selecting passive elements with specific resonance frequencies corresponding to different frequency bands, the system changes the electromagnetic parameters between antenna elements to achieve both miniaturization and reduced interconnection.
3Volume of moving object
If passive elements are added to reduce interconnection, then the distance between antenna elements can be reduced, but the device complexity increases
Solution Approach 1:
The passive elements serve multiple functions simultaneously: they resonate at specific frequency bands to enable multi-band operation, provide impedance transformation to reduce interconnection between antenna elements, and act as spacing elements that allow physical miniaturization. This multi-functionality reduces overall device complexity despite adding components.
Solution Approach 2:
The patent combines the functions of frequency selection, impedance matching, and physical spacing into single passive elements. By merging these functions, the design avoids the need for separate components for each function, thereby reducing overall structural complexity while achieving miniaturization.
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 effectively miniaturizes multi-band compatible multi-antenna devices by reducing the distance between antenna elements, enhancing their integration in communication equipment without compromising frequency band compatibility, and maintaining impedance matching.
Implementation Method 1
a first passive element which resonates at a frequency corresponding to a first frequency band is provided between a first antenna element and a second antenna element
Data Source
AI summary
A multi-band compatible multi-antenna device which is miniaturized by reducing a distance between antenna elements includes a first antenna element corresponding to a 1.5 GHz band and a 2.0 GHz band, a second antenna element corresponding to the 1.5 GHz band and the 2.0 GHz band, a first passive element which is arranged between the first antenna element and the second antenna element and which resonates at a frequency corresponding to the 1.5 GHz band, and a second passive element which is arranged between the first antenna element and the second antenna element separately from the first passive element and which resonates at a frequency corresponding to the 2.0 GHz band.