Multilayered Cavity Resonators With Conductive Boards for Low-Loss RF Design
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Solution Overview
Problem
Conventional RF and microwave cavity resonators are heavy, expensive, bulky, and environmentally inefficient due to metal fabrication, with connectors causing performance degradation and limited design flexibility.
Innovation Solution
Multilayered cavity structures constructed from dielectric/diamagnetic materials and electrically conducting layers, allowing for compact, lightweight designs with integrated connectors and reduced material waste, using stacked flat boards with openings and conducting layers to form cavities.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional metal fabrication techniques are used to manufacture cavity resonators, then the structural strength and electrical conductivity are improved, but the weight, cost, and environmental impact worsen
Solution Approach 1:
The cavity resonator is constructed using composite materials: a non-conductive substrate material (such as ceramic or plastic) combined with conductive materials (such as metal plating or conductive paint) applied to the inner surfaces. This composite structure provides the necessary electrical conductivity for RF/microwave operation while significantly reducing the overall weight compared to solid metal construction.
2Reliability
If conventional metal fabrication techniques are used to manufacture cavity resonators, then the structural strength and electrical conductivity are improved, but the manufacturing cost and material waste worsen
Solution Approach 1:
The use of composite materials allows for more efficient manufacturing processes. Non-conductive substrates can be manufactured using standard molding or fabrication techniques, and conductive layers can be applied through plating, coating, or printing methods. This approach reduces material waste compared to machining metal blocks and lowers overall manufacturing costs while maintaining the required electrical conductivity.
3Adaptability or versatility
If connectors are introduced in the resonant cavities to couple with system components, then the system integration is improved, but the RF performance degradation worsens
Solution Approach 1:
The connector structures are designed to be minimally intrusive, extracted or removed from the main RF signal path where possible. Alternative coupling methods such as capacitive coupling, inductive coupling, or waveguide interfaces are employed to eliminate or reduce the need for traditional mechanical connectors that disrupt the RF field distribution and degrade performance.
4Ease of manufacture
If conventional manufacturing techniques are used, then the cavity structures can be made with traditional materials, but the design flexibility and environmental efficiency worsen
Solution Approach 1:
The composite construction enables greater design flexibility by allowing the substrate material to be optimized for mechanical properties and the conductive layers to be optimized for electrical properties independently. Different substrate materials (ceramics, plastics, composites) and conductive materials can be selected and combined based on specific application requirements, enabling customized designs that conventional monolithic metal fabrication cannot achieve.
5Ease of manufacture
If conventional manufacturing techniques are used, then the cavity structures can be made with traditional materials, but the material waste and environmental impact worsen
Solution Approach 1:
The composite material approach allows for more efficient use of materials. Non-conductive substrates can be manufactured with minimal waste using molding techniques, and conductive layers are applied only where needed on the inner surfaces through plating or coating processes. This targeted application of materials significantly reduces waste compared to conventional metal block machining where large portions of material are removed and discarded.
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 solution provides lightweight, cost-effective, and environmentally friendly cavity resonators with improved performance and design flexibility, reducing material and manufacturing costs while minimizing electromagnetic losses.
Implementation Method 1
the inner surfaces of the resonant cavities and cavity structures are coated with good electrically conducting plating such as, but not limited to, silver, gold, copper, and suchlike. to increase reflectivity, hence, reduce losses of the electromagnetic waves
Implementation Method 2
cavity resonators are typically closed electrically conducting structures (e.g., metal box) that reinforce standing-wave in the cavity filled with air/gas, or another dielectric/diamagnetic material, and configured to trap electromagnetic waves thereinside
Data Source
Figure 1A~1C
Figure 1D~1G
Figure 2A~2C
AI summary
A cavity device is disclosed comprising a plurality of flat boards stacked one on top of the other to form a multilayered structure. At least some of the flat boards comprise at least one opening or perforations having one or more layers of electrically conducting materials configured to establish electrical conduction with one or more layers of electrically conducting materials of another one of the flat boards, to thereby form electrically conducting patterns in the multilayered structure for interacting with electromagnetic radiation introduced into the cavity device.