Recessed Active Antenna Module for Multi-Band Base Station Arrays
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Solution Overview
Problem
The increasing number of frequency bands and sectorization in cellular communications systems leads to a need for more base station antennas, but physical constraints such as zoning ordinances and weight limitations restrict the number of antennas that can be deployed, necessitating the development of multi-band antennas that efficiently manage different frequency bands without increasing the number of physical antennas.
Innovation Solution
The design of base station antennas with a passive antenna assembly and a separate active antenna module that can be externally coupled, utilizing a frequency selective surface or substrate to manage RF energy across different frequency bands, allowing for interchangeable active antenna modules to be easily installed or replaced, thereby optimizing antenna performance without increasing physical antenna count.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the number of base station antennas is increased to accommodate more frequency bands and sectors, then the frequency coverage and service capacity are improved, but the weight and wind loading on the antenna tower increase beyond acceptable limits
Solution Approach 1:
The patent combines multiple frequency band capabilities into a single multi-band antenna system. The antenna integrates low-band, mid-band, and high-band radiating elements within one physical structure, allowing the base station to support multiple frequency bands without deploying separate antennas for each band. This merging approach maintains frequency coverage while reducing the total number of antennas and their associated weight on the tower.
Solution Approach 2:
The antenna is designed with universal functionality to operate across multiple frequency bands simultaneously. By incorporating radiating elements that support low-band (617-960 MHz), mid-band (1427-2690 MHz), and high-band (3.3-4.2 GHz) operations, a single antenna structure performs the function of multiple specialized antennas, thereby reducing tower load while maintaining service capacity.
2Adaptability or versatility
If multiple linear arrays are deployed to support different frequency bands, then the multi-band service capability is improved, but the number of base station antennas increases beyond what zoning ordinances and tower constraints allow
Solution Approach 1:
The patent merges multiple linear arrays that would traditionally require separate antenna installations into a single integrated antenna structure. The multi-band antenna incorporates low-band, mid-band, and high-band linear arrays within one physical unit, reducing the number of discrete antenna installations needed while maintaining the ability to support multiple frequency bands simultaneously.
Solution Approach 2:
The antenna achieves universal multi-band capability through a single device that can transmit and receive signals across low-band, mid-band, and high-band frequencies. This multi-functional design eliminates the need for deploying multiple single-band antennas, thereby reducing device complexity and the number of antenna installations required to meet zoning ordinances and tower constraints.
3Device complexity
If a single linear array is used to provide service in multiple frequency bands, then the device complexity is reduced, but the performance and efficiency in handling different frequency bands simultaneously deteriorates
Solution Approach 1:
The antenna structure is segmented into distinct radiating element groups, each optimized for specific frequency bands (low-band, mid-band, high-band). This segmentation allows each segment to efficiently handle its designated frequency range while the overall antenna system maintains a unified, relatively simple structure. The segmented design enables simultaneous operation across multiple bands without the complexity of multiple separate antenna systems.
Solution Approach 2:
Different portions of the antenna structure are designed with local quality variations to optimize performance for specific frequency bands. The radiating elements are configured with different geometries and arrangements in different regions of the antenna, allowing each local region to efficiently handle its assigned frequency band while contributing to the overall multi-band capability of the single antenna system.
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 configuration enhances the capacity of base station antennas to handle multiple frequency bands efficiently, allowing for flexible and cost-effective upgrades and installations while maintaining a compact form factor, thus addressing the physical constraints and increasing demand for frequency coverage.
Implementation Method 1
utilizing a frequency selective surface or substrate to manage RF energy across different frequency bands
Data Source
AI summary
Base station antennas include an externally accessible active antenna module releasably coupled to a recessed segment that is over a chamber in the base station antenna and that is longitudinally and laterally extending along and across a rear of a base station antenna housing. The base station antenna housing has a passive antenna assembly that cooperates with the active antenna module.