Base Station Antenna Reflector Strips for Active Array Integration
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Solution Overview
Problem
The existing passive base station antennas face challenges in maintaining structural rigidity and RF performance due to the large opening required for active beamforming arrays, which can lead to increased movement under high winds and interference with RF signals during electronic scanning.
Innovation Solution
The design incorporates longitudinally-extending tubular reflector strips with widened sections for mounting feedboard printed circuit boards, reducing the width of the reflector strips while maintaining structural integrity and improving electronic scanning performance by positioning radiating elements forward of the opening, and using dielectric auxiliary strips to reduce metal reflectivity and enhance azimuth scanning.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a large opening is provided in the passive reflector assembly for the active beamforming array, then the active antenna module can be mounted and RF signals can pass through, but the structural rigidity of the passive base station antenna is reduced, leading to increased movement under high winds
Solution Approach 1:
The passive base station antenna is divided into separate functional modules: a passive antenna module with radiating elements and a reflector assembly, and a removable active antenna module. This segmentation allows the opening to be optimized for active module mounting while the overall structure maintains rigidity through the distributed passive elements and reflector geometry.
Solution Approach 2:
The active antenna module is nested within the passive base station antenna structure, positioned at the focal point of the reflector assembly. The active module fits into the opening in the reflector, creating a nested configuration where the smaller active module is contained within the larger passive structure, allowing both to coexist without compromising overall structural integrity.
2Adaptability or versatility
If a large opening is provided in the passive reflector assembly, then the active beamforming array can be mounted, but the reflector strips may interfere with RF signals during electronic scanning
Solution Approach 1:
The reflector strips are designed with specific local properties: they are positioned and dimensioned to reflect RF signals from the passive radiating elements while minimizing interference with the active beamforming array's electronic scanning. The opening geometry and reflector strip placement create zones where passive reflection occurs without blocking active beam paths.
Solution Approach 2:
The solution addresses interference by operating in different spatial dimensions: the passive radiating elements and their reflected beams occupy different angular and spatial regions than the active beamforming array's scanned beams. The reflector strips are positioned to manipulate passive signals in one dimensional space while leaving other dimensions clear for active scanning operations.
3Strength
If the reflector strips are made wide to maintain structural integrity, then mechanical strength is improved, but the opening size for the active antenna module is reduced
Solution Approach 1:
The reflector strips are designed with curved or tapered geometries rather than simple straight rectangular forms. This curvature allows the strips to maintain structural strength through optimized stress distribution while reducing their projected width in the critical opening direction, thereby maximizing the available aperture for the active antenna module.
Solution Approach 2:
The reflector strip dimensions are optimized by changing key parameters: width, thickness, and positioning are adjusted to achieve the optimal balance between structural integrity and opening size. The strips are positioned at specific distances from the reflector face and have varying cross-sectional properties along their length to maintain strength while minimizing obstruction.
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 the mechanical support and RF performance of passive base station antennas, reducing the impact on active beamforming arrays and improving the structural integrity and scanning capabilities, especially under high wind conditions and wide electronic scanning angles.
Implementation Method 1
a passive reflector assembly that includes a main reflector that has a main reflecting surface
Data Source
AI summary
A base station antenna comprises a reflector assembly and a first radiating element having a first feed stalk and a first radiator. A base of the first feed stalk is adjacent the reflector assembly and the first radiator is adjacent a distal end of the first feed stalk. A center of the first radiator is offset from the base of the first feed stalk in a longitudinal direction that is parallel to a longitudinal axis of the base station antenna.