Multi-Sector Base Station Antenna with Alternating Polarizations
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Solution Overview
Problem
The Air-To-Ground cellular communications network faces limitations in call handling capacity and reliability due to a single radio frequency link between aircraft and terrestrial base stations, leading to congestion and service interruptions, especially when multiple aircraft are in close proximity, resulting in a need for enhanced system availability and capacity.
Innovation Solution
The Multi-Link Aircraft Cellular System addresses this by establishing simultaneous communication links with multiple terrestrial cells or sectors using multiple antennas on aircraft and optimized base station antenna patterns, employing orthogonal polarizations and Walsh code domain separation to increase capacity and reliability, thereby distributing traffic load across multiple cells and sectors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a single radio frequency link is used between aircraft and terrestrial base stations, then device complexity is reduced, but call handling capacity and system reliability are limited
Solution Approach 1:
The patent segments the single radio frequency link into multiple simultaneous links between aircraft and terrestrial base stations. Each link operates independently with its own transceiver and antenna system, allowing traffic to be distributed across multiple paths. This segmentation increases system reliability by eliminating the single point of failure while managing complexity through modular, independent link structures.
Solution Approach 2:
The patent introduces a new dimension to the communication architecture by establishing multiple spatial links between aircraft and different terrestrial base stations simultaneously. Instead of relying on a single vertical link, the system creates a multi-dimensional communication mesh that includes horizontal and diagonal paths, thereby improving reliability without proportionally increasing device complexity at any single point.
2Productivity
If multiple sectors per terrestrial base station are implemented, then call handling capacity is increased, but device complexity and interference management become more challenging
Solution Approach 1:
The patent applies local quality by assigning different polarizations to different sectors of terrestrial base stations. Each sector is optimized with a specific polarization characteristic (horizontal, vertical, or circular) matched to its geographic orientation and traffic patterns. This allows each sector to operate independently with tailored properties, increasing overall call handling capacity while managing interference through localized polarization differentiation rather than uniform system-wide complexity.
3Object-affected harmful factors
If alternating polarizations are assigned to adjacent sectors, then co-channel interference is reduced, but system complexity and polarization management increase
Solution Approach 1:
The patent changes the polarization parameter as a distinguishing characteristic between adjacent sectors. By systematically varying the polarization state (horizontal, vertical, right-hand circular, left-hand circular) across different sectors, the system reduces co-channel interference through orthogonal signal separation. This parameter-based differentiation manages interference efficiently without requiring complex spatial or temporal multiplexing, thereby controlling system complexity while effectively reducing harmful interference.
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 approach significantly enhances call handling capacity and system reliability by spreading traffic load across multiple links, reducing the risk of service interruptions and improving overall network throughput, even during peak demand from multiple aircraft.
Implementation Method 1
employing orthogonal polarizations and Walsh code domain separation to increase capacity and reliability
Data Source
Figure 1~1C
Figure 2~2B
Figure 3~3B
AI summary
The Multi-Link Aircraft Cellular System makes use of multiple physically separated antennas mounted on the aircraft, as well as the use of additional optional signal isolation and optimization techniques to improve the call handling capacity of the Air-To-Ground cellular communications network These additional techniques can include polarization domain and ground antenna pattern shaping (in azimuth, in elevation, or in both planes) Further, if code domain separation is added, dramatic increases in capacity are realized Thus, the Air-To-Ground cellular communications network can increase its capacity on a per aircraft basis by sharing its traffic load among more than one cell or sector and by making use of multiple physically separated antennas mounted on the aircraft, as well as the use of additional optional signal isolation and optimization techniques