Screw Assembly for Phased Array Antenna Spacing Control
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Solution Overview
Problem
In applications like phased array antennas, maintaining precise spacing between components is challenging due to manufacturing variations, leading to performance degradation and instability, as small variations in spacing can significantly impact the effectiveness and optimization of the antenna's performance characteristics.
Innovation Solution
A screw assembly with a first screw having a right-hand or left-hand thread and a second screw with a corresponding opposite thread, allowing for the maintenance of a constant gap between components by engaging and securing them through a friction device, ensuring accurate positioning and alignment of radiating elements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If traditional stacking methods are used to assemble adjacent components, then manufacturing simplicity is maintained, but spacing precision and locational tolerances deteriorate due to manufacturing variations
Solution Approach 1:
A spacer component is introduced as an intermediary element between adjacent structural components. The spacer maintains a constant gap distance and compensates for manufacturing variations in the primary components, thereby achieving precise spacing without requiring high-precision manufacturing of the main structural elements.
Solution Approach 2:
The spacer is pre-configured with the exact gap distance required before assembly. By establishing the spacing relationship in advance through the spacer design, the system eliminates the need for post-assembly adjustments and ensures consistent spacing tolerances across all adjacent components.
2Manufacturing precision
If clearance is increased between adjacent plates to reduce spacing inconsistencies, then spacing precision improves, but structural connection strength deteriorates
Solution Approach 1:
The spacer serves as a mediator that provides both the clearance needed for spacing consistency and the structural connection path. By incorporating threading features and engagement mechanisms, the spacer maintains the required gap while still enabling strong mechanical connection between adjacent plates through rotational engagement.
Solution Approach 2:
The connection mechanism transitions from a static rigid connection to a dynamic adjustable connection. The threaded engagement allows for rotational adjustment and incremental tightening, enabling the connection to adapt to manufacturing variations while maintaining both the required clearance and structural strength.
3Strength
If adjacent components are stacked in contact to improve structural strength, then connection strength improves, but spacing precision deteriorates due to manufacturing variations compounding
Solution Approach 1:
The spacer acts as a buffer intermediary that decouples the spacing relationship from the structural connection. By placing the spacer between adjacent components, the system achieves both goals: the spacer provides the constant gap distance for spacing precision while its threading features enable strong mechanical engagement for structural strength.
Solution Approach 2:
The connection system is segmented into distinct functional elements: the spacer provides spacing function, while the threading and engagement features provide connection strength. This segmentation allows each element to optimize its specific function without compromising the other, resolving the contradiction between spacing precision and structural strength.
Data Source
AI summary
A screw assembly for maintaining a substantially constant gap between adjacent components includes a first screw including: an exterior surface including a first threaded surface; and an inner wall defining a bore, the bore being coaxial with a longitudinal axis of the first screw, the inner wall including a second threaded surface, wherein one of the first threaded surface or the second threaded surface is arranged with a right-hand thread, and the other one of the first threaded surface or the second threaded surface is arranged with a left-hand thread.