Reflector Strip Assembly for Hybrid Base Station Antenna Openings
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Solution Overview
Problem
Passive base station antennas with large openings for active beamforming arrays compromise structural support, leading to reduced rigidity and potential damage under high winds, and interfere with RF performance, especially during electronic scanning.
Innovation Solution
The design incorporates longitudinally-extending tubular reflector strips with widened sections for feedboard printed circuit boards and tilted radiating elements, along with dielectric auxiliary strips to enhance structural support and reduce RF interference, allowing for improved mechanical and RF performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If large openings are provided in the passive reflector assembly for active beamforming arrays, then RF performance and electronic scanning capability are improved, but structural integrity and rigidity deteriorate under high winds
Solution Approach 1:
The reflector assembly is segmented into multiple longitudinal strips that are spaced apart to form openings. These strips are connected by transverse strips, creating a modular structure that maintains structural integrity while providing necessary openings for active beamforming arrays and electronic scanning capability.
Solution Approach 2:
The reflector strips are positioned specifically to balance structural support and RF performance. The longitudinal strips provide structural rigidity while the spaces between them allow RF energy transmission. The transverse connecting strips are placed at strategic locations to maintain overall structure without blocking RF paths.
2Adaptability or versatility
If large openings are provided in the passive reflector assembly for active beamforming arrays, then active antenna function is enabled, but structural support and rigidity are compromised
Solution Approach 1:
The reflector assembly is divided into multiple longitudinal strips with spaces between them, creating a segmented structure that provides openings for active beamforming arrays while maintaining overall structural support through the distributed strip configuration.
Solution Approach 2:
The reflector assembly uses a composite structure of multiple strips (both passive and active) arranged in a specific pattern. This composite configuration allows the structure to provide both mechanical support and enable active antenna functions through the integrated design of strips and openings.
3Strength
If reflector strips are positioned close to the opening, then structural support is improved, but RF performance deteriorates due to interference
Solution Approach 1:
The reflector strips are positioned at specific locations that optimize the balance between structural support and RF performance. The strips are close enough to provide structural rigidity but spaced and dimensioned to minimize interference with RF energy transmission paths for both passive and active arrays.
Solution Approach 2:
The positioning of reflector strips is optimized to accommodate dynamic electronic scanning operations. The strips are placed to provide structural support while allowing sufficient clearance for the electronic beam steering operations of the active array without causing harmful RF interference.
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 enhanced reflector assembly provides increased structural integrity and reduced RF interference, maintaining performance even under high winds and during wide electronic scanning angles, while supporting both passive and active antenna functions effectively.
Implementation Method 1
passive base station antennas that include both passive and active linear arrays... passive linear arrays that generate antenna beams... main reflector... reflector strips
Implementation Method 2
tilted radiating elements... pointing angle of the generated antenna beams in the elevation (vertical) plane
Data Source
Figure 1A
Figure 1B
Figure 1C
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.