Level Sensing Device Using Dielectric Rod Signal Coupling
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Solution Overview
Problem
High-frequency radar systems for level sensing face challenges due to high construction costs, complex precision construction, and vulnerability of monolithic microwave integrated circuits (MMICs) in hostile environments, particularly when operating in limited aperture sizes for bulk materials or fluids, where maintenance is difficult.
Innovation Solution
A high-frequency radar system using a compact, encapsulated module with MMICs mounted on a carrier board via surface mount techniques, employing a dielectric rod for signal coupling instead of waveguide transitions, providing protection and screening, and operating in the millimeter band for improved resolution and gain.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional waveguide transitions are used for antenna connections, then signal transmission is achieved, but manufacturing complexity and cost increase significantly
Solution Approach 1:
The patent extracts the complex waveguide transition structure and replaces it with a simplified dielectric rod structure. The dielectric rod is a simple cylindrical component that can be easily manufactured and integrated, eliminating the need for complex precision-machined waveguide transitions while maintaining signal transmission functionality.
Solution Approach 2:
The dielectric rod is a simple, inexpensive component compared to precision waveguide transitions. It can be easily manufactured from standard dielectric materials and requires minimal precision machining, significantly reducing manufacturing cost and complexity while performing the necessary signal coupling function.
2Reliability
If MMICs are packaged as bare die for high frequency operation, then performance is improved, but construction cost and manufacturing complexity increase
Solution Approach 1:
The patent combines the MMIC, dielectric rod, and housing into a single integrated module. The MMIC is mounted directly on the housing structure itself, eliminating the need for separate carrier substrates and complex interconnections. This integration simplifies manufacturing while preserving the high-frequency performance of bare-die MMICs.
Solution Approach 2:
The housing structure serves multiple functions: it provides mechanical protection, acts as the mounting substrate for the MMIC, serves as part of the electromagnetic structure, and provides the interface for the dielectric rod. This multi-functionality reduces the total component count and manufacturing complexity.
3Measurement precision
If aperture size is increased for better resolution, then level sensing accuracy improves, but device size and cost increase
Solution Approach 1:
The patent changes the operating frequency parameter to the millimeter wave range (30-300 GHz). At these higher frequencies, the wavelength is much shorter, allowing for smaller aperture sizes to achieve the same angular resolution as larger apertures at lower frequencies. This enables high-resolution level sensing in compact devices suitable for container applications.
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 reduces manufacturing costs and complexity, enhances resolution and gain, and ensures reliable operation in harsh environments by encapsulating RF components and using a dielectric rod for signal extraction, allowing for efficient level sensing of bulk materials and fluids with improved accuracy and maintenance resilience.
Implementation Method 1
coupling means for channelling a radiated signal from the patch antenna out of the module, wherein the coupling means comprises a dielectric rod
Implementation Method 2
the components are encapsulated with a material which provides screening of the microwave components
Data Source
AI summary
A level sensing device with a high frequency radar system is provided. The radar system includes a radar high frequency module, a carrier board and a controller. The radar high frequency module is mounted on the carrier board using surface mount techniques. The controller includes a processor and the radar high frequency module has a plurality of components including one or more microwave integrated circuits, a radiating patch antenna, and coupling means for channeling a radiated signal from the patch antenna out of the module. The components are encapsulated to form the module and the coupling means includes a dielectric rod.