Base Station Radiating Element Layout for Broadband Decoupling
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Solution Overview
Problem
The increasing number of frequency bands and sectorization in cellular communications systems leads to challenges in implementing multi-band base station antennas due to interaction between different arrays, which affects antenna beam shape and size constraints, making it difficult to meet customer requirements.
Innovation Solution
The design of base station antennas with radiating elements that include overlapping conductive paths and parasitic elements, configured to operate in different frequency bands, with specific conductive path arrangements to suppress currents in higher frequency bands while allowing low-band currents to flow freely, thereby reducing signal scattering and maintaining antenna performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple arrays of radiating elements are deployed to support service in different frequency bands, then the number of supported frequency bands increases, but the arrays interact with each other causing challenges in meeting customer requirements relating to antenna size and width
Solution Approach 1:
The patent places multiple conductive paths (first and second conductive paths) in overlapping or nested configurations within the same spatial footprint. The first conductive path includes multiple segments that overlap with corresponding segments of the second conductive path, allowing multiple frequency bands to be supported without proportionally increasing antenna width.
Solution Approach 2:
The patent transitions from a two-dimensional planar arrangement to a three-dimensional stacked configuration by positioning conductive paths at different heights (first conductive path above second conductive path). This vertical stacking allows multiple frequency bands to be supported while maintaining a compact horizontal footprint.
2Adaptability or versatility
If different arrays of radiating elements are used to support service in different frequency bands, then frequency band coverage increases, but signal scattering between arrays occurs affecting antenna beam shape
Solution Approach 1:
The patent extracts and eliminates the harmful interaction between frequency bands by using overlapping conductive paths that are configured to suppress currents in higher frequency bands while allowing low-band currents to flow freely. This separation of current paths prevents signal scattering between bands.
Solution Approach 2:
The patent applies different current suppression characteristics to different segments of the conductive paths. The overlapping segments are specifically configured to suppress higher frequency currents while maintaining low-band current flow, creating localized quality differences that prevent signal scattering.
3Productivity
If the number of base station antennas is increased to accommodate increasing volume of cellular communications, then communication capacity increases, but weight and wind loading constraints for antenna towers limit further deployment
Solution Approach 1:
The patent merges multiple frequency band functions into a single multi-band antenna structure. By integrating first and second conductive paths that support different frequency bands into one antenna assembly, the need for multiple separate antennas is eliminated, reducing overall tower weight and wind loading.
Solution Approach 2:
The patent creates a universal antenna structure that can support service in multiple frequency bands simultaneously. The radiating element with overlapping conductive paths serves multiple functions (supporting different frequency bands) that would traditionally require separate dedicated antennas.
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
The solution enables reduced scattering between radiating elements operating in different frequency bands, maintaining optimal antenna beam patterns and reducing the number of antennas needed, thus lowering tower leasing costs.
Implementation Method 1
reduced scattering between radiating elements operating in different frequency bands
Data Source
AI summary
An antenna comprises first and second radiating elements that are configured to operate in respective first and second operating frequency bands, and a parasitic element that includes a overlapping first and second conductive paths. The first conductive path includes a plurality of first segments and the second conductive path includes a plurality of second segments. A subset of the first segments overlap respective ones of the second segments to form a plurality of pairs of overlapping first and second segments and at least some of these pairs are configured so that an instantaneous direction of a first current formed on the first segment in response RF radiation emitted by the second radiating element will be opposite an instantaneous direction of a second current formed on the second segment in response to the RF radiation emitted by the second radiating element.