Thin-Film Reflectarray Structure for Lightweight Curved Mounting
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Solution Overview
Problem
Existing reflectarrays are not designed to be thinner and lighter, which poses challenges in production and installation.
Innovation Solution
A reflectarray design comprising a ground layer, dielectric layer, and element pattern layer, where the thickness of the dielectric layer and element length satisfy the relational formula l ≥ 4.4 × t and 0.001 < t < 0.25, using materials like Cu and Al to reduce weight and thickness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Weight of moving object
If conventional reflectarray designs are used, then the reflectarray can effectively reflect electromagnetic waves, but the reflectarray becomes thicker and heavier, making installation difficult and limiting production methods
Solution Approach 1:
The patent employs thin film structures for the ground layer and element pattern layer, replacing conventional thick metallic structures. The ground layer uses thin conductive films (e.g., sputtered Cu or Al films with thickness of several micrometers), and the element patterns are formed as thin conductive traces on the dielectric substrate. This thin-film approach dramatically reduces the overall thickness and weight of the reflectarray while maintaining its electromagnetic wave reflection functionality through optimized film conductivity and pattern design.
Solution Approach 2:
The patent changes the physical parameters of the reflectarray structure by reducing the thickness of conductive layers from conventional millimeter-scale metal plates to micrometer-scale thin films. The element pattern dimensions, spacing, and dielectric layer thickness are optimized to specific ranges that maintain reflection performance at the target frequency while enabling the overall structure to be thin and flexible. This parameter optimization allows the reflectarray to achieve both thinness and functional reliability.
2Ease of manufacture
If the reflectarray is made thinner and lighter, then flexibility and ease of installation improve, but production complexity increases due to thin film fabrication requirements
Solution Approach 1:
The patent replaces conventional mechanical metal fabrication processes (cutting, bending, assembling metal plates) with thin film deposition and patterning techniques. The ground layer and element patterns are formed using vacuum deposition (sputtering) or similar thin film technologies, followed by photolithographic patterning. This substitution enables the reflectarray to be manufactured as a thin, flexible laminate that can be easily cut, bent, and installed on various surfaces, eliminating the need for complex mechanical assembly of thick metal components.
Solution Approach 2:
By adopting thin film structures for all conductive elements, the patent creates a inherently flexible and lightweight reflectarray that can be easily handled and installed. The thin film nature allows the reflectarray to conform to curved surfaces and be integrated into applications where weight and flexibility are critical, while the thin-film fabrication processes are well-established in the electronics industry, making production feasible despite the specialized requirements.
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 design results in a thinner and lighter reflectarray with improved flexibility and reduced conductor loss, enabling installation on curved surfaces and facilitating roll-to-roll production.
Implementation Method 1
a reflectarray that reflects an incident wave in a desired direction
Implementation Method 2
each of the plurality of elements has an element structure including at least a patch and a ground plate, an element spacing of first neighboring elements is different from an element spacing of second neighboring elements
Data Source
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Figure 3
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AI summary
The present invention has been made to provide a thinner and lighter reflectarray. One of representative reflectarrays according to the present invention includes: a ground layer; a dielectric layer; and an element pattern layer having a plurality of element patterns, wherein a thickness t (mm), which is a thickness of the dielectric layer and an element length 1 (mm), which is a length of each of the plurality of element patterns, satisfy the following relational formula. The ground layer has a surface resistance of 100 Ω/□ or less. At least one of the ground layer and the element pattern layer is made of Cu or Al.