Single-Layer Radome Structure for A+P Antenna Frequency Separation
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Solution Overview
Problem
Existing 'A+P' base station antennas have a large total thickness, weight, and brittleness due to multiple layers of frequency selective surfaces, which affect assembly and structural integrity, and common frequency selective surfaces made of resin or plastic are not rigid enough for efficient integration of active and passive antennas.
Innovation Solution
A single-layer antenna cover with a frequency selective surface is designed, incorporating a periodic circuit on the cover plate to separate high and low-frequency signals, and reinforced with mounting racks and arch bridge structures to enhance structural strength and stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple layers of frequency selective surfaces are used in common A+P base station antennas, then the frequency separation between high and low-frequency signals is improved, but the total thickness, weight, and brittleness of the antenna cover increase
Solution Approach 1:
The patent combines multiple frequency selective surfaces into a single integrated layer, merging the functions of high-frequency signal transmission and low-frequency signal reflection into one structure. This single-layer design maintains the frequency separation capability while eliminating the need for multiple cascaded layers, thereby reducing the overall thickness and weight of the antenna cover.
Solution Approach 2:
The single-layer frequency selective surface is designed to perform multiple functions simultaneously: it acts as a ground structure for low-frequency signals to prevent penetration, while also serving as a transparent structure for high-frequency signals. This multi-functional design replaces what would traditionally require multiple specialized layers, reducing complexity and thickness.
2Reliability
If multiple layers of frequency selective surfaces are used in common A+P base station antennas, then the frequency separation between high and low-frequency signals is improved, but the weight of the antenna increases
Solution Approach 1:
The patent combines multiple frequency selective surfaces into a single integrated layer, merging the functions of high-frequency signal transmission and low-frequency signal reflection into one structure. This single-layer design maintains the frequency separation capability while eliminating the need for multiple cascaded layers, thereby reducing the overall thickness and weight of the antenna cover.
3Length of stationary object
If a single-layer frequency selective surface is used, then the thickness and weight are reduced, but the rigidity and structural strength decrease
Solution Approach 1:
The patent employs composite material structures within the single-layer frequency selective surface, combining different materials with complementary properties. This composite construction provides both the required frequency selective functionality and the necessary mechanical strength and rigidity, eliminating the need for multiple layers while maintaining structural integrity.
Solution Approach 2:
The single-layer frequency selective surface incorporates locally optimized structures with varying thicknesses, densities, or material compositions in different regions. This local quality variation allows the surface to maintain high rigidity and strength where needed while keeping the overall structure thin and lightweight in other areas.
4Length of stationary object
If a single-layer frequency selective surface is used, then the thickness is reduced, but the brittleness increases making assembly difficult
Solution Approach 1:
The patent employs composite material structures within the single-layer frequency selective surface, combining different materials with complementary properties. This composite construction provides both the required frequency selective functionality and the necessary mechanical strength and rigidity, eliminating the need for multiple layers while maintaining structural integrity and ease of assembly.
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 reduces the antenna cover's thickness, improves assembly efficiency, and enhances structural integrity, ensuring stable operation and extended service life by preventing deformation and interference between high and low-frequency signals.
Implementation Method 1
A periodic circuit is disposed on a region on a side of the cover plate facing the first assembly space and at least corresponding to the second assembly space to form a frequency selective surface
Data Source
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AI summary
An antenna cover includes a housing having an opening and a cover plate covering the opening. In this antenna cover, the housing and the cover plate jointly form a first assembly space for fixing a passive unit. A side of the cover plate back from the first assembly space is provided with a second assembly space for fixing an active unit. A periodic circuit is disposed on a region on a side of the cover plate facing the first assembly space and at least corresponding to the second assembly space to form a frequency selective surface, so that the present disclosure can dispose the active unit on the side of the cover plate back from the first assembly space without affecting low-frequency reflection and high-frequency wave-transmission efficiency, thereby reducing the total thickness of the antenna cover. In addition, the present disclosure replaces the multilayer cascade structure in the existing technology with only one layer of antenna cover having a frequency selective surface, optimizing and streamlining the structural setup, improving assembly efficiency, and realizing lightweight production.