Antenna Isolation Network for Close-Spaced Multi-Antenna Layouts
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Solution Overview
Problem
Modern wireless communication devices face challenges in placing multiple antennas with good performance due to limited space, poor isolation, and impedance matching issues, especially with the increasing frequency bandwidths of Wi-Fi 6E and 5G technologies.
Innovation Solution
An antenna assembly with an isolation network is introduced, featuring a conductive structure and isolation circuit between antennas, allowing closer spacing and improved impedance matching, using components like resistors, capacitors, and inductors to enhance performance across wider frequency bands.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If antennas are placed close to each other to reduce device size, then device dimensions are reduced, but isolation between antennas deteriorates causing poor wireless throughput
Solution Approach 1:
The patent introduces an isolation network as an intermediary component between adjacent antennas. This network includes a conductive structure with specific geometry (such as a U-shaped or C-shaped configuration) that acts as a mediator to reduce mutual coupling between antennas. The conductive structure is coupled to ground and positioned between the antennas to provide isolation without requiring large spacing between the antenna elements.
2Area of stationary object
If antennas are placed close to each other to save space, then area occupied by antennas is reduced, but impedance matching deteriorates due to mutual coupling
Solution Approach 1:
The isolation network serves as a mediator that decouples the electromagnetic interaction between adjacent antennas. The conductive structure, when coupled to ground, creates an electromagnetic barrier that reduces mutual coupling effects. This allows each antenna to maintain its designed impedance characteristics even when placed in close proximity to other antennas, thereby achieving good impedance matching without requiring large separation distances.
3Adaptability or versatility
If more antennas are added to support Wi-Fi 6E and 5G technologies, then wireless communication capability is enhanced, but device complexity increases making placement challenging
Solution Approach 1:
The patent segments the isolation structure into modular conductive elements that can be independently designed and positioned between different antenna pairs. This segmentation allows the isolation network to be adapted to various antenna configurations and layouts. The modular approach simplifies the integration process when adding multiple antennas for Wi-Fi 6E and 5G support, as each isolation element can be independently optimized and placed without redesigning the entire antenna system.
Solution Approach 2:
The isolation network provides localized isolation between specific antenna pairs rather than requiring global spacing adjustments. By placing conductive structures only where needed between adjacent antennas, the design maintains local isolation quality without increasing overall device complexity. This localized approach allows flexible arrangement of multiple antennas while maintaining performance.
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 improved isolation and reduced return loss, enabling thinner and lighter device designs while supporting multiple wireless communication protocols, including 5G and Wi-Fi 6E, with reduced spacing requirements and enhanced coexistence with other system components.
Implementation Method 1
an isolation circuit coupled between the conductive structure and the ground plane, wherein the isolation circuit includes a resistor and a capacitor
Data Source
Figure 1~2
Figure 3A~3B
Figure 3C
AI summary
Various embodiments provide an antenna assembly and associated systems, devices, and methods. The antenna assembly may include two or more antennas, including a first antenna and a second antenna, coupled to a ground plane. The antenna assembly may further include an isolation network coupled to the ground plane between the first and second antennas. The isolation network may include a conductive structure between conductive antenna portions of the first and second antennas, and an isolation circuit coupled between the conductive structure and the ground plane. The isolation circuit may include a resistor, an inductor, and/or a capacitor (e.g., coupled in parallel with one another). Other embodiments may be described and claimed.