MIMO Antenna Segmentation for Compact Wireless Devices
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Solution Overview
Problem
Designing an inner MIMO antenna that meets the demands of wireless devices while maintaining a simple and compact shape has proven challenging, as existing MIMO antennas face difficulties in optimizing transmission rate and communication quality without frequency band changes or power expenditure.
Innovation Solution
A multi-input multi-output (MIMO) device design featuring a substrate with position throughways, a shielding cover with feed throughways, and a combination of solid and plane antennas configured to reduce volume and enhance polarization effectiveness, including a planar inverted F antenna and G-shaped plane radiators to efficiently transmit electromagnetic signals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Shape
If an inner MIMO antenna is designed to maintain a simple and compact shape, then device simplicity and compactness are improved, but transmission rate and communication quality deteriorate
Solution Approach 1:
The antenna is divided into multiple independent antenna elements (first antenna element, second antenna element, third antenna element, fourth antenna element) that can be separately configured and optimized. Each element has its own radiation pattern characteristics, allowing the system to achieve MIMO performance while maintaining a compact overall structure through strategic placement of segmented elements.
Solution Approach 2:
The patent utilizes three-dimensional space by positioning antenna elements at different heights and orientations within the device housing. The first and second antenna elements are positioned at different heights with horizontal polarization, while the third and fourth antenna elements are positioned at different heights with vertical polarization, effectively using vertical and horizontal dimensions to achieve spatial diversity without increasing planar footprint.
2Productivity
If multiple antennas are used to increase transmission rate and communication quality, then productivity is improved, but device complexity increases
Solution Approach 1:
Multiple antenna elements are integrated into a unified MIMO antenna system with shared support structures and common mounting mechanisms. The first and second antenna elements are coupled to a first support, while the third and fourth antenna elements are coupled to a second support, merging multiple functions into an integrated assembly that reduces overall device complexity compared to separate antenna implementations.
Solution Approach 2:
The antenna system provides multiple functions through its four antenna elements: support for MIMO communication, provision of both horizontal and vertical polarization, and operation across different frequency bands. The diverse polarization capabilities and spatial arrangement enable the same antenna structure to serve multiple communication requirements simultaneously, reducing the need for separate specialized antennas.
3Reliability
If antenna elements are positioned at different heights with diverse polarization, then communication quality is improved, but manufacturing precision requirements increase
Solution Approach 1:
The antenna elements are pre-positioned and pre-aligned during the antenna assembly manufacturing process rather than requiring precise field installation. The support structures are designed with built-in positioning features that guide correct placement, and the antenna elements are pre-configured with their specific orientations (horizontal or vertical polarization) before integration into the device, reducing the precision burden on final device assembly.
Solution Approach 2:
Support structures serve as intermediary components that facilitate precise positioning of the antenna elements. The first support couples the first and second antenna elements at different heights, while the second support couples the third and fourth antenna elements, acting as mediating structures that simplify the positioning task by providing standardized mounting interfaces and spatial references.
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 proposed MIMO device achieves increased transmission rate and communication quality with reduced volume, maintaining a compact shape and effective polarization, as demonstrated by return loss less than −10 dB in frequency bands from 2.4 GHz to 2.5 GHz, without requiring frequency band changes or transmission power expenditure.
Implementation Method 1
a MIMO antenna configured to reduce volume of the device and increase polarization effectiveness... to efficiently transmit electromagnetic signals
Data Source
AI summary
A multiple-input multiple-output (MIMO) device includes a substrate, a shielding cover and a MIMO antenna. The shielding cover is positioned on the substrate, and includes a plurality of sidewalls. The MIMO antenna includes a first solid antenna, a second solid antenna, and a plane antenna. The first solid antenna and the second solid antenna are electrically connected to two ends of one sidewall of the shielding cover, respectively. The first plane antenna is configured on the substrate, and disposed between the first solid antenna and the second solid antenna.