Dielectric Reflectarray Antenna Fabrication via Substrate Integration
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Solution Overview
Problem
Dielectric reflectarray antennas for millimeter-wave operations face challenges in accurately mounting small dielectric reflector elements, leading to performance misalignment issues, and materials with low dielectric constants result in large antenna size and low gain.
Innovation Solution
A method involving a substrate with a dielectric layer and metallic layers to form an array of dielectric reflector elements through laser or chemical etching and milling, eliminating the need for separate alignment and attachment of elements, using a high dielectric constant substrate to enhance gain and reduce size.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If separate dielectric reflector elements are mounted individually, then assembly flexibility is improved, but manufacturing precision deteriorates due to alignment errors
Solution Approach 1:
The patent merges multiple separate dielectric reflector elements into a single integrated substrate structure. The reflector elements are formed as part of the substrate itself through patterning, eliminating the need for separate mounting operations and ensuring precise relative positioning without alignment errors.
Solution Approach 2:
While the substrate is integrated, the reflector elements themselves are segmented into distinct functional regions with different dielectric properties or geometries. This segmentation allows each element to perform its specific phase-shifting function while maintaining precise spatial relationships through the unified substrate fabrication process.
2Ease of manufacture
If materials with low dielectric constants are used, then ease of manufacture is improved, but antenna gain deteriorates and antenna size increases
Solution Approach 1:
The patent changes the dielectric constant parameter of the substrate material to a higher value. This parameter change enables compact antenna size and high gain performance, as the higher dielectric constant allows for smaller electrical dimensions while maintaining the same operating frequency and phase characteristics.
3Volume of moving object
If dielectric reflector elements are made small for millimeter-wave operation, then antenna size is reduced, but manufacturing precision deteriorates due to mounting difficulty
Solution Approach 1:
The patent combines the miniaturized reflector elements with the substrate into a single integrated structure. This merging eliminates the separate mounting step that would be required for individual small elements, thereby avoiding alignment errors while maintaining the compact size necessary for millimeter-wave operation.
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 method allows for the fabrication of a high-gain dielectric reflectarray antenna with improved accuracy and cost-effectiveness, achieving a measured peak antenna gain of 23.9 dBi and reducing fabrication complexity and errors.
Implementation Method 1
the dielectric constants (or relative permittivities) of materials suitable for use in 3D printing are usually low... using a high dielectric constant substrate to enhance gain and reduce size
Data Source
AI summary
The invention relates to a method for making a dielectric reflectarray antenna, and a dielectric reflectarray antenna made using such method. The method includes removing, from a substrate having a dielectric layer and a first outer metallic layer arranged on one side of the dielectric layer, the first outer metallic layer to form an intermediate substrate. The method also includes cutting the intermediate substrate to integrally form a dielectric reflectarray with an array of dielectric reflector elements of the dielectric reflectarray antenna.