Conformal Multi-Port Antenna Layout for Compact MIMO Isolation
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Solution Overview
Problem
Conventional antennas struggle to meet the requirements of compact form factor and efficient MIMO/MU-MIMO transmissions in multi-radio wireless devices, particularly in integrating multiple antennas and managing interference and signal leakage.
Innovation Solution
The development of a compact integral conformal antenna system with a multi-segment multi-port (MSMP) antenna design and interface matrix, which allows for dynamic configuration of RF signals and polarization, enabling efficient MIMO and MU-MIMO communications by integrating multiple antennas on a single printed circuit board (PCB) and dynamically reconfiguring coverage areas.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If multiple conventional antennas are integrated into a compact form factor, then the number of antennas increases to support MIMO/MU-MIMO, but signal leakage and interference between antennas increase
Solution Approach 1:
The antenna system is divided into multiple independent antenna segments (first antenna segment, second antenna segment, third antenna segment, fourth antenna segment) that can be separately configured and positioned. Each segment can be independently connected to different radio frequency (RF) chains, allowing for spatial separation and reduced mutual interference while maintaining compact integration through the conformal PCB structure.
Solution Approach 2:
The antenna system transitions from a planar two-dimensional arrangement to a three-dimensional conformal structure that wraps around or follows the device housing contours. This dimensional change enables better spatial distribution of multiple antenna elements in a compact volume, improving isolation between antennas while maintaining a small form factor suitable for mobile devices.
2Object-generated harmful factors
If antenna spacing is increased to reduce interference, then signal leakage decreases, but the overall device size increases
Solution Approach 1:
By transitioning to a three-dimensional conformal antenna layout, the system achieves effective spatial separation of antenna elements without increasing the device's planar footprint. The antenna segments are distributed across multiple surfaces and orientations, providing interference reduction while maintaining a compact overall device volume.
Solution Approach 2:
The conformal antenna system integrates multiple antenna segments within the contours of the device housing, effectively nesting the antenna structure within the available three-dimensional space. This allows for optimized antenna spacing and isolation without proportionally increasing the external device dimensions.
3Productivity
If multiple RF ports are integrated to support MIMO, then spectral efficiency increases, but antenna coupling and interference increase
Solution Approach 1:
The system divides the antenna functionality into multiple independent segments that can be separately optimized and positioned. Each antenna segment can be independently connected to different RF chains through the interface matrix, reducing mutual coupling effects while maintaining the multiple RF ports necessary for MIMO operations and high spectral efficiency.
4Volume of moving object
If conventional antenna designs are used to achieve compact form factor, then device size decreases, but the ability to provide efficient MIMO transmissions is compromised
Solution Approach 1:
The conformal antenna system utilizes three-dimensional spatial distribution of antenna segments across multiple surfaces and orientations, enabling effective MIMO performance in a compact form factor. This dimensional approach allows sufficient antenna element separation and geometric diversity for reliable MIMO transmissions without increasing the device's planar footprint.
Solution Approach 2:
The interface matrix provides multi-functional connectivity, allowing any antenna segment to be dynamically connected to any RF chain. This universal interconnection capability enables the same compact conformal antenna structure to support various MIMO configurations and transmission modes, maintaining reliability across different operational requirements.
Data Source
AI summary
A compact integral conformal antenna system, and methods for fabricating the compact integral conformal antenna system, are described. Also described are use cases of the compact integral conformal antenna system in a wireless device which includes multiple multiple-input multiple-output (MIMO) and/or multi-user multiple-input multiple-output (MU-MIMO) capable radios.