Multi-Band MIMO Antenna With Dynamic Beam Steering
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Solution Overview
Problem
Current MIMO antenna systems face challenges in maintaining isolation and de-correlated radiation patterns across multiple frequency bands, especially in mobile devices where antenna detuning occurs due to various use cases, impacting communication throughput.
Innovation Solution
A multi-band antenna system with a transmission line network incorporating filters, switches, and active components that dynamically adjust correlation and isolation between antennas, enabling beam steering and optimal radiation pattern alteration using active modal antennas and filter blocks controlled by a processor.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If multiple antennas are collocated in a mobile device for MIMO systems, then communication throughput is improved, but antenna isolation and de-correlated radiation patterns deteriorate
Solution Approach 1:
The patent implements dynamic beam steering capability that allows the radiation patterns of collocated antennas to be actively adjusted and steered in different directions. This dynamic control enables the system to maintain de-correlated radiation patterns across multiple frequency bands by adapting the antenna patterns to the specific operating band and environmental conditions, thereby preserving antenna isolation while utilizing multiple antennas for MIMO throughput improvement
2Volume of moving object
If antenna elements are placed closer together to reduce device volume, then device compactness is improved, but antenna isolation and efficiency deteriorate
Solution Approach 1:
The patent employs dynamic beam steering and pattern adjustment mechanisms that allow closely-spaced antenna elements to achieve their full potential by electronically controlling their radiation patterns. This enables the system to compensate for the reduced physical separation by actively shaping and steering the beams in different directions, thereby maintaining antenna efficiency and isolation performance despite the compact form factor
Solution Approach 2:
The patent utilizes parameter changes in the radiation patterns of the antenna elements through beam steering control. By dynamically adjusting parameters such as beam direction, width, and shape, the system can optimize the performance of closely-spaced antenna elements, ensuring they maintain adequate isolation and efficiency even when physically constrained in a compact mobile device
3Reliability
If antenna configuration is optimized for one frequency band, then performance at that band is improved, but multi-band operation capability deteriorates
Solution Approach 1:
The patent implements a universal antenna system with dynamic beam steering capability that can adapt to multiple frequency bands. The same antenna elements and control mechanism serve all frequency bands, with the system automatically adjusting the beam patterns and steering angles appropriate for each band's characteristics. This multi-functional approach enables optimized performance across LTE bands 2, 4, 5, 7, and 17 without requiring separate dedicated antenna configurations for each band
Solution Approach 2:
The patent employs dynamic adaptation of radiation patterns that allows the antenna system to optimize its performance for the currently active frequency band. The beam steering control dynamically adjusts the radiation characteristics based on the operating band, ensuring optimal performance whether operating at lower or higher frequencies, thereby achieving both band-specific optimization and multi-band versatility
Data Source
AI summary
An active antenna system and algorithm is described that provides for dynamic tuning and optimization of antenna system parameters for a MIMO system where correlation and isolation between antennas in the system are dynamically altered to provide for greater throughput. As one or multiple antennas are loaded or de-tuned due to environmental changes, corrections to correlation and/or isolation are made by selecting the optimal antenna radiation pattern and by adjusting electrical length and/or reactive loading of transmission lines connecting the antennas. Multiple Isolated Magnetic Dipole (IMD) antennas are co-located and connected with a feed network that can include switches that adjust phase length for transmission lines connecting the antennas. Filtering is integrated into the feed network to improve rejection of unwanted frequencies. Filtering can also be implemented on the antenna structure.