Conductive Clips for Phased Array Antenna Thermal Expansion
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Solution Overview
Problem
Existing array antenna technologies face challenges in achieving compact design with embedded RF components, allowing for thermal expansion, and maintaining large scan angles without mismatch scanning issues, due to mechanical gaps acting as waveguides, and complex assembly with bolts that hinder maintenance and thermal expansion.
Innovation Solution
The use of 3D radiator packages with conductive resilient clips that allow for easy assembly, thermal expansion, and cooling, eliminating the need for bolts and minimizing RF gaps by providing galvanic contact between adjacent packages, thus preventing waveguide interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If mechanical gaps are left between radiator packages for thermal expansion, then thermal expansion is accommodated, but RF gaps act as waveguides causing interference and mismatch scanning problems
Solution Approach 1:
A conductive element acts as an intermediary between adjacent radiator packages, serving dual functions: it provides thermal expansion accommodation through mechanical compliance while simultaneously blocking RF electromagnetic fields to prevent waveguide interference. The conductive element is positioned within the mechanical gap to address both thermal and RF concerns simultaneously.
Solution Approach 2:
The electrical conductivity parameter of the gap-filling element is specifically selected to achieve RF shielding while maintaining thermal compliance. By changing the material parameter (using conductive material rather than insulator), the solution transforms the gap from an RF waveguide into an RF-blocking barrier while preserving thermal expansion capabilities.
2Object-generated harmful factors
If bolts with contact shims are used to suppress waveguide modes, then RF interference is reduced, but assembly complexity increases and thermal expansion is restricted
Solution Approach 1:
The complex bolt-and-shim assembly mechanism is extracted and replaced by a simpler conductive element that achieves the same RF shielding function without requiring multiple components, special tools, or complex assembly procedures. The solution removes unnecessary mechanical fastening elements while retaining the essential RF blocking capability.
Solution Approach 2:
The mechanical fastening parameter (bolts requiring tight fastening) is changed to a simpler retention parameter (retaining clips or adhesive), and the electrical conductivity parameter is optimized to provide RF shielding without requiring physical contact between radiator packages, thus allowing thermal expansion.
3Object-generated harmful factors
If bolts are tightly fastened to suppress waveguide modes, then RF interference is minimized, but thermal expansion is prevented
Solution Approach 1:
The conductive element serves as a mediator that decouples the RF shielding function from the thermal expansion constraint. It provides electrical continuity for RF blocking while its mechanical design (suspended or compliant mounting) allows thermal expansion of radiator packages without transmitting constraining forces.
Solution Approach 2:
The conductive element is designed with dynamic mechanical properties (compliance or suspension) that allow it to move with thermal expansion while maintaining its RF shielding position. This dynamic design enables the system to adapt to thermal changes without compromising RF performance.
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
Enables easy assembly and maintenance of scanning phased array antennas with large scan angles and bandwidth performance, while allowing for thermal expansion and reducing the complexity of assembly and cooling requirements.
Implementation Method 1
conductive resilient clips that allow for easy assembly, thermal expansion, and cooling, eliminating the need for bolts and minimizing RF gaps by providing galvanic contact between adjacent packages
Implementation Method 2
minimizing RF gaps by providing galvanic contact between adjacent packages, thus preventing waveguide interference
Data Source
Figure 1a~1b
Figure 2
AI summary
There is disclosed an apparatus comprising a plurality of three-dimensional radiator elements, each radiator element transmitting or receiving electromagnetic waves. The radiator elements are arranged so that at least one pair of adjacent radiator elements are separated by a gap, which behaves like a waveguide inducing by a coupling effect electromagnetic interferences with the waves. The apparatus comprises means to establish a galvanic contact between the adjacent radiator elements, so as to suppress the coupling effect, while allowing for the thermal expansion of the adjacent radiator elements. Application : detection, telecom.