Frequency Selective Radome With Gas-Filled Gap
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Solution Overview
Problem
Current radome technologies face challenges in reducing signal loss while maintaining frequency selectivity, particularly for multimode sensors that require protection from environmental interference and efficient transmission of IR and millimeter-wave signals, with existing solutions being costly and prone to manufacturing complexities.
Innovation Solution
A frequency selective radome design featuring a first and second dielectric layer separated by an inner gas-filled gap, where the thickness of the gap and layers are determined using simulation to allow desired signal transmission while rejecting other wavelengths, eliminating the need for direct contact between dielectric layers and reducing manufacturing costs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If wire grids are inserted between two layers of dielectric material to achieve frequency selectivity, then frequency selectivity is improved, but signal loss increases and manufacturing complexity increases
Solution Approach 1:
The patent removes the wire grid component entirely from the radome structure. Instead of inserting wire grids between dielectric layers, the invention uses only dielectric layers with precisely controlled thicknesses and a gas-filled gap to achieve frequency selectivity through constructive and destructive interference of electromagnetic waves, thereby eliminating the signal loss and manufacturing issues associated with wire grids
Solution Approach 2:
The patent achieves frequency selectivity by precisely controlling the thickness parameters of the dielectric layers and the gap between them. By adjusting these dimensional parameters, the radome creates specific resonance conditions that allow desired frequencies to pass while blocking others, replacing the need for wire grids with parameter-based frequency control
2Ease of manufacture
If two dielectric layers are placed in direct contact to form a frequency selective radome, then manufacturing is simplified, but manufacturing precision becomes difficult to achieve due to tolerance requirements
Solution Approach 1:
The patent introduces a gas-filled gap as an intermediary between the two dielectric layers. This gap acts as a mediator that eliminates the need for direct surface contact between the dielectric layers, thereby removing the stringent tolerance requirements for surface flatness and contact uniformity while still maintaining the frequency selective functionality through the controlled gap thickness
3Adaptability or versatility
If wire grids are used in the radome structure to achieve frequency selectivity, then frequency filtering is improved, but device complexity and manufacturing cost increase
Solution Approach 1:
The patent extracts and removes the wire grid component from the radome structure entirely. The frequency filtering capability is achieved solely through the dielectric layers and gas-filled gap configuration, eliminating the structural complexity and manufacturing costs associated with wire grids while maintaining the essential frequency selective functionality
4Ease of manufacture
If small spaces appear between dielectric layers due to machining tolerances, then manufacturing becomes easier, but interference effects occur that spoil the IR image
Solution Approach 1:
The gas-filled gap serves as an intermediary that intentionally creates a controlled space between the dielectric layers. This designed gap eliminates the problematic unintended small spaces that occur with direct contact, providing a uniform medium that prevents interference effects while accommodating normal machining tolerances without compromising the IR image quality
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 radome achieves minimal signal loss and cost-effectiveness by allowing selective transmission of IR and millimeter-wave signals while rejecting other wavelengths, improving performance and reducing manufacturing complexities compared to prior art radomes.
Implementation Method 1
The thickness of the gap is determinative of a selective transmission of a desired millimeter wavelength passband
Implementation Method 2
allow both IR and millimeter wave radar signals to be transmitted
Data Source
AI summary
A system including a first dielectric layer comprising a solid material configured to form a first layer of a radome, and a second dielectric layer comprising a solid material configured to form a second layer of the radome. The first dielectric layer and the second dielectric layer are spaced apart to provide an inner gap configured as a third layer of the radome. The inner gap is exclusively filled with a gas. The radome is configured to provide for the radome to be frequency selective. A radome and method are also disclosed.