Multi-feed MIMO Antenna Resonator Isolation
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Solution Overview
Problem
MIMO systems face challenges in maximizing capacity due to channel correlation caused by mutual coupling between antennas, which is exacerbated by size limitations and environmental factors like reflections and scatterings, and require efficient multi-band operation without increasing device size and cost.
Innovation Solution
A multi-feed multi-band MIMO antenna system utilizing in-band and out-of-band resonators, along with feeding-type diversity, to mitigate mutual coupling and provide additional isolation between frequency bands, eliminating the need for costly diplexers by using orthogonal antenna positioning and distinct feeding mechanisms for each band.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If antennas are placed far apart to reduce mutual coupling, then channel correlation decreases, but device size increases
Solution Approach 1:
The patent introduces resonators as intermediary elements positioned between the antennas to cancel mutual coupling effects. These resonators act as mediators that manipulate the electromagnetic fields between antennas, providing channel decorrelation without requiring large antenna spacing, thus maintaining compact device size while achieving reliable MIMO performance
Solution Approach 2:
The patent employs resonators that are tuned to specific frequencies to cancel mutual coupling at those frequencies. By adjusting the resonator parameters (frequency, quality factor, coupling strength), the system dynamically optimizes the electromagnetic environment between antennas, achieving frequency-selective decorrelation in compact configurations
2Adaptability or versatility
If diplexers are used to separate frequency bands, then multi-band operation is achieved, but device complexity and cost increase
Solution Approach 1:
The patent designs resonators that simultaneously serve multiple functions: they cancel mutual coupling between antennas, provide frequency-selective filtering for multi-band operation, and reduce out-of-band interference. This multi-functionality eliminates the need for separate diplexers, reducing device complexity while maintaining adaptability across multiple frequency bands
Solution Approach 2:
The patent combines the functions of mutual coupling cancellation and frequency band separation into a single integrated resonator structure. By merging these previously separate functions into one component, the system achieves multi-band operation without the added complexity of traditional diplexer-based solutions
3Reliability
If resonators are added to cancel mutual coupling, then antenna isolation improves, but device complexity increases
Solution Approach 1:
The patent implements resonators using printed circuit board (PCB) techniques, creating thin, flexible resonant structures that can be easily integrated into the antenna assembly. These planar resonator designs minimize structural complexity while effectively canceling mutual coupling, maintaining simple manufacturing processes and compact form factors
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 reduces mutual coupling and out-of-band interference, achieving isolation comparable to commercial diplexers while reducing device size and cost, thus enhancing the capacity and efficiency of MIMO systems in Wi-Fi and other wireless applications.
Implementation Method 1
utilizing in-band resonators to suppress the mutual coupling between the antennas
Implementation Method 2
the first resonator is operable to filter out the second frequency range and the second resonator is operable to filter out the first frequency range
Implementation Method 3
at least a first antenna and a second antenna orthogonally positioned with respect to each other, wherein the first antenna is configured to operate over a first frequency range and the second antenna is configured to operate over a second frequency range
Implementation Method 4
out of band resonators to reject the unwanted currents generated by the 5 GHz port, which is disrupting the operation of the 2.4 GHz port and vice versa
Data Source
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AI summary
According to aspects of the disclosure, a multi-feed multi-band MIMO antenna system comprises at least two antennas orthogonally positioned with respect to each other, which are operating over two different frequency ranges; at least two out-of-band resonators coupled with the two antennas respectively; and, at least two other in-band resonators coupled with the two antennas respectively and designed to decrease mutual coupling in the frequency ranges, where the first resonator filters out signals having the second frequency range leaking into a first antenna, while the second resonator filters out other signals having the first frequency range leaking into a second antenna.