MIMO Antenna Layout With Cable Channels for High Wi-Fi Isolation
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Solution Overview
Problem
Conventional dual-band Wi-Fi antennas have poor system throughput, radio coverage, and return loss, and require improved antenna design for next-generation IEEE 802.11ax WLANs with reduced parasitic electromagnetic coupling and high efficiency, especially for simultaneous transmit and receive operations.
Innovation Solution
A MIMO antenna system with a conductive ground plane, vertically and horizontally polarized antennas, and cable channels that house feeding cables to minimize parasitic radiation and enhance isolation, achieving high antenna isolation and uniform radiation efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional dual-band Wi-Fi antennas are used, then basic Wi-Fi functionality is provided, but system throughput, radio coverage, and return loss are relatively poor
Solution Approach 1:
The antenna system is divided into four separate antenna elements arranged in a 2x2 matrix configuration, with each element independently fed by separate cables. This segmentation allows each antenna to be optimized for specific frequency bands and polarization directions, improving overall system throughput and return loss characteristics compared to conventional dual-band antennas.
Solution Approach 2:
Different regions of the antenna structure are designed with different properties: the antenna elements have specific geometries optimized for 2.4 GHz and 5 GHz bands, the ground plane is divided into multiple feed points, and cable channels are positioned at specific locations to minimize interference. This local optimization enables simultaneous dual-band operation with improved throughput and return loss.
2Ease of manufacture
If feeding cables are routed externally without cable channels, then installation is simpler, but parasitic radiation increases causing cross-talk between antennas
Solution Approach 1:
Cable channels are introduced as intermediary structures that guide feeding cables from external connections to the antenna feed points. These channels act as shielding structures that contain the electromagnetic fields of the cables, preventing parasitic radiation and cross-talk while maintaining manageable cable installation through defined pathways.
Solution Approach 2:
The feeding cables are nested within the cable channels, which are themselves integrated into the ground plane structure. This nested configuration allows the cables to be housed within the antenna assembly without increasing external dimensions, reducing parasitic radiation while maintaining ease of installation through the channel pathways.
3Adaptability or versatility
If more cables are used to connect all antennas in MIMO system, then antenna diversity is improved, but parasitic radiation and cross-talk increase
Solution Approach 1:
Multiple cable channels are merged into a unified ground plane structure, with all channels sharing the same shielding environment. This combining approach allows multiple cables to be routed simultaneously while the common ground plane provides consistent shielding, maintaining antenna diversity benefits while suppressing cross-talk through collective electromagnetic containment.
Solution Approach 2:
The cable channels are positioned in specific spatial arrangements within the ground plane, utilizing three-dimensional space to route cables away from each other. This spatial separation in multiple dimensions reduces electromagnetic coupling between cables while maintaining the MIMO antenna diversity configuration, thereby reducing cross-talk.
4Reliability
If vertically and horizontally polarized antennas are combined, then isolation between MIMO pairs is improved, but antenna system complexity increases
Solution Approach 1:
The antenna system employs asymmetric polarization configurations where adjacent antenna elements have orthogonal polarizations (vertical and horizontal). This asymmetric arrangement creates natural isolation between MIMO pairs through polarization diversity, improving reliability while the symmetric 2x2 matrix layout maintains overall structural simplicity for ease of manufacturing.
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 provides an architecture with tri-band capability, >43 dB cross-pair isolation, reduced gain ripple, and enhanced throughput without compromising radiation uniformity, supporting advanced applications like 4K video and IoT.
Implementation Method 1
feeding cables will typically cause undesired parasitic radiation, which could lead to undesired cross-talk between antennas
Implementation Method 2
The antenna system performance is further improved by applying a combination of differently polarized (horizontally and vertically polarized) antennas for enabling best isolation between separate MIMO pairs
Data Source
AI summary
The invention relates to a MIMO antenna system for IEEE 802.11 WiFi communication. The invention also relates to a wireless device, such as a wireless access point (AP), a router, a gateway, and/or a bridge, comprising at least one antenna system according to the invention. The invention further relates to a wireless communication system, comprising a plurality of antenna systems according to the invention, and, preferably, a plurality of wireless devices according to the invention.