Grid Reflector Base Station Antennas With FSS Band Separation
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Solution Overview
Problem
Current base station antennas face challenges in efficiently managing multiple frequency bands and heat dissipation, particularly with the integration of active and passive antenna modules, which can lead to performance limitations and overheating issues.
Innovation Solution
The implementation of a base station antenna design featuring a grid reflector with a frequency selective surface (FSS) and feed boards that allow high-band radiating elements to propagate while reflecting lower-band signals, along with a configuration that includes coaxial cables and radiating elements to manage heat dissipation through a die-cast heat sink.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a frequency selective surface (FSS) with feed board apertures is used to allow high-band signals to propagate while reflecting lower-band signals, then frequency band management is enhanced and the need for additional filters is reduced, but the structural complexity of the antenna increases
Solution Approach 1:
The frequency selective surface (FSS) with feed board apertures serves multiple functions simultaneously: it acts as a frequency filter to separate high-band and low-band signals, serves as a reflector for low-band signals, and provides structural support for mounting radiating elements. This multi-functionality reduces the need for separate filter components while managing multiple frequency bands effectively.
2Productivity
If integrated base station antennas with active and passive modules are deployed to accommodate increasing cellular communications volume, then capacity is increased, but heat dissipation becomes more difficult leading to overheating issues
Solution Approach 1:
The base station antenna is divided into separate active and passive modules, each with its own heat management considerations. The active module containing radios and amplifiers is physically separated from passive radiating elements, allowing targeted cooling strategies for each section and improving overall thermal management efficiency.
3Quantity of substance
If multiple linear arrays of radiating elements are integrated into a single base station antenna to increase capacity without adding more antennas, then the number of base station antennas is reduced, but the device complexity increases
Solution Approach 1:
Multiple linear arrays of radiating elements are nested within a single antenna housing structure. The passive and active modules are arranged in a nested configuration where radiating elements are positioned in front of reflectors, and active components are integrated behind the passive structures, all contained within one unified antenna unit.
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 design enhances frequency band management, reduces the need for additional filters, and effectively dissipates heat, improving the overall performance and efficiency of the base station antenna system.
Implementation Method 1
The grid reflector may be configured as a frequency selective surface (FSS) with feed board apertures that allow high band radiating elements to propagate electromagnetic waves therethrough and reflect lower band signal from lower band radiating elements
Implementation Method 2
reflect lower band signal from lower band radiating elements in front of the reflector
Implementation Method 3
configuration that includes coaxial cables and radiating elements to manage heat dissipation through a die-cast heat sink
Data Source
AI summary
Base station antennas include at least one internal grid reflector with a feed board aperture covered by a feed board and that is configured to transmit RF energy from an array of mMIMO radiating elements through the grid reflector and out a front radome of the base station antenna while reflecting RF energy from low band and/or mid band radiating elements in a different frequency band(s) from the mMIMO radiating elements.