Asymmetric Snap-Fit Arch for Base Station Antenna
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Solution Overview
Problem
Existing arch structures for multi-band base station antennas face issues with assembly complexity, stability, and interference with dipole or dipole isolation walls due to snap-fits arranged in straight lines, leading to increased costs and potential breakage during assembly and wind load tests.
Innovation Solution
The arch structure features snap-fits arranged in non-linear configurations such as triangular, parallelogram, or trapezoidal layouts, with at least two snap-fits not on the projection mid-axis, and an I-shaped interface unit matching a U-shaped groove on the reflector, eliminating the need for extra rivets and enhancing stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If snap-fits are arranged horizontally in a straight line on the projection mid-axis, then the arch structure is simple to manufacture, but it causes interference with dipole or dipole isolation wall in multi-band base station antenna
Solution Approach 1:
The patent applies asymmetry by arranging snap-fits in non-linear configurations (triangular, parallelogram, or trapezoidal layouts) rather than symmetric straight-line arrangements. This asymmetric positioning moves snap-fits away from the projection mid-axis, eliminating interference with dipoles while maintaining manufacturing feasibility through standardized snap-fit components.
Solution Approach 2:
The patent transitions from one-dimensional linear arrangement of snap-fits to two-dimensional geometric patterns (triangles, parallelograms, trapezoids). This dimensional change allows snap-fits to be positioned at multiple locations across the arch width, avoiding dipole interference zones while distributing mechanical loads more effectively.
2Stability of the object's composition
If two extra rivets are used to connect the arch to both side edges of the reflector, then the arch structure is stable, but it increases assembly time and labor costs
Solution Approach 1:
The patent merges the functions of rivets and snap-fits by integrating side-edge connection capabilities directly into the snap-fit structure. The snap-fits are designed to engage with both the reflector bottom and side edges simultaneously, eliminating the need for separate riveting operations while maintaining structural stability.
Solution Approach 2:
The snap-fit structure is designed with multi-functionality to perform both primary fixation (bottom mounting) and secondary fixation (side-edge connection) roles. This universal design allows a single component to replace multiple fastening elements, reducing assembly steps and labor costs while ensuring arch stability.
3Ease of operation
If clips are used to fix the side edge of the reflector instead of rivet, then the assembly process is simpler, but the clips are more likely to break and the fit clearance causes frequent breakage
Solution Approach 1:
The patent employs curved or tapered engagement surfaces in the snap-fit design, allowing gradual stress distribution during assembly and operation. The curved geometry provides self-aligning features that reduce impact loads on the connection points, enhancing durability while maintaining ease of assembly through snap-fit engagement.
Solution Approach 2:
The snap-fit structure incorporates built-in compliance and stress-distribution features that cushion against impact loads and misalignment forces before they can cause failure. The flexible engagement design absorbs shock loads that would otherwise break brittle clip connections, improving reliability without complicating the assembly process.
Data Source
AI summary
The present invention provides an arch structure for multi-band base station antenna, the arch structure comprises two interface units for connecting with the side edge of a reflector, and a plurality of snap-fits for fixing with the bottom of the reflector, wherein at least two snap-fits in the plurality of snap-fits are not arranged on a projection mid-axis of the arch structure. According to the arch structure of the present invention, it can effectively avoid the interference between the arch structure and the dipole or dipole isolation wall, and enhance the stability of arch structure, so that the width of the arch structure can be reduced and the manufacturing cost can be saved.