Polarized Antenna Circuitry for mmWave MIMO Alignment
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Solution Overview
Problem
MIMO performance in mmWave frequencies is affected by environmental changes and antenna orientation, leading to reduced throughput due to misalignment of polarization orthogonality between user equipment and base station antennas.
Innovation Solution
An apparatus with an antenna array and circuitry that adjusts the gain and orientation of polarized RF signals to align the polarization of beams, using transceiver circuitry and phase shifters to dynamically control the orientation of orthogonal polarizations, ensuring optimal alignment with the channel for improved MIMO performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If mmWave frequencies are used to increase bandwidth and throughput, then data transmission capacity is improved, but MIMO performance deteriorates due to increased sensitivity to environmental changes and antenna orientation
Solution Approach 1:
The patent implements dynamic beam orientation adjustment by varying the gain of RF signals conveyed between signal feeds and front end circuitry. This allows the system to adapt beam orientation in real-time to environmental changes and maintain optimal MIMO performance while using mmWave frequencies for high throughput transmission
2Device complexity
If fixed antenna orientation is used to simplify device structure, then device complexity is reduced, but MIMO throughput deteriorates due to polarization misalignment between user equipment and base station
Solution Approach 1:
The patent employs dynamic gain variation of RF signals to adjust beam orientation adaptively. This dynamic adjustment mechanism maintains polarization orthogonality alignment between user equipment and base station antennas, ensuring optimal MIMO throughput without requiring complex fixed multi-orientation antenna structures
3Reliability
If gain variation circuitry is added to adjust beam orientation, then MIMO performance is improved through maintained polarization alignment, but device complexity increases
Solution Approach 1:
The patent varies the gain parameter of RF signals conveyed between signal feeds and front end circuitry to adjust beam orientation. By controlling the gain parameter dynamically, the system maintains polarization alignment and Cross Polarization Discrimination without requiring structurally complex circuitry
Solution Approach 2:
The gain variation circuitry is integrated into the existing transceiver architecture, allowing the same circuit components to serve multiple functions: signal amplification, beam orientation adjustment, and polarization maintenance. This multi-functionality approach improves MIMO performance without proportionally increasing overall device complexity
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
This solution enhances MIMO throughput by maintaining maximum antenna gain and Cross Polarization Discrimination (XPD) across various alignments, reducing unwanted cross-couplings and ensuring maximum MIMO Rank and throughput regardless of channel orthogonality orientation.
Implementation Method 1
an antenna array of antenna elements having signal feeds configured to convey a pair of radio frequency (RF) signals related to a pair of polarised beams; and circuitry coupled to the signal feeds and configured to vary a gain of the pair of radio frequency signals conveyed between the signal feeds and front end circuitry to vary an orientation of the pair of polarised beams
Data Source
Figure 1a~2d
Figure 3a~4b
Figure 5A
AI summary
An apparatus, comprising an antenna array of antenna elements having signal feeds configured to convey a pair of radio frequency signals related to a pair of polarised beams; and circuitry coupled to the signal feeds and configured to vary a gain of the pair of radio frequency signals conveyed between the signal feeds and front end circuitry to vary an orientation of the pair of polarised beams.