Modular Base Station Antenna With External Active Module Isolation
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Solution Overview
Problem
Current base station antennas face challenges in efficiently managing heat generated by integrated radios and maintaining performance across multiple frequency bands without increasing the number of antennas, while also requiring flexibility for different cellular service providers and frequency support.
Innovation Solution
The design incorporates a passive antenna assembly with a housing and a reflector, coupled with an active antenna module using RF chokes and capacitive/galvanic coupling, allowing for interchangeable active antenna modules and improved RF isolation, which helps in heat management and frequency band support.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If integrated radios are added to base station antennas for active beamforming, then beamforming capability and frequency band support are improved, but heat generation increases
Solution Approach 1:
The patent divides the base station antenna system into separate functional modules: passive antenna elements for radiation and active radio frequency (RF) modules for signal processing. This segmentation allows the RF modules to be positioned away from the main antenna body, with heat dissipation paths directed away from sensitive components, thereby managing thermal load while maintaining multi-band capability
Solution Approach 2:
The patent introduces intermediate structures such as RF shields and ground planes between active RF modules and passive antenna elements. These intermediaries provide both electromagnetic isolation to prevent interference and thermal management by creating heat dissipation pathways, allowing the system to support multiple frequency bands without excessive heat accumulation
2Adaptability or versatility
If multiple linear arrays of radiating elements are added to accommodate new frequency bands, then multi-band capability is improved, but device complexity increases
Solution Approach 1:
The patent designs a universal passive antenna structure that can support multiple frequency bands through the integration of separate active RF modules. Each RF module is configured for specific frequency bands, while the shared passive antenna structure provides common mechanical support and radiation elements, reducing overall system complexity compared to having separate antennas for each band
Solution Approach 2:
The patent segments the antenna system into modular RF units that can be independently configured for different frequency bands. This modular approach allows operators to selectively activate only the RF modules needed for their specific service requirements, simplifying the operational complexity while maintaining the capability to support multiple bands
3Temperature
If heat sinks are added to vent heat from integrated radios, then heat management is improved, but device complexity and size increase
Solution Approach 1:
The patent combines thermal management functions with existing structural components of the base station antenna. Heat sinks are integrated into the mounting brackets and support structures that already exist for securing the antenna to the tower, eliminating the need for separate, additional thermal management hardware and reducing overall device complexity
Solution Approach 2:
The patent utilizes the natural convection currents and ambient airflow present in the deployment environment to assist heat dissipation. The antenna structure is designed with open mounting configurations and spaced components that allow passive cooling through natural air circulation, reducing the need for active cooling mechanisms or complex thermal management systems
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 base station antenna's performance by allowing for interchangeable active antenna modules, efficient heat dissipation, and improved RF isolation, supporting multiple frequency bands without increasing the antenna's size or complexity.
Implementation Method 1
capacitive/galvanic coupling
Implementation Method 2
capacitive/galvanic coupling
Implementation Method 3
RF chokes
Implementation Method 4
The heat sinks 54 are thermally conductive
Implementation Method 5
Heat generated in the radios 50 passes to the heat sink 54 and spreads to the fins 54f. As shown in FIG. 2, the fins 54f are external to the antenna housing 10h. This allows the heat to pass from the fins 54f to the external environment.
Data Source
AI summary
Base station antennas include an externally accessible active antenna module releasably coupled to a rear of the housing. The base station antenna housing has a passive antenna assembly that cooperates with the active antenna module.