Gas-Tight Waveguide Coupling for High-Frequency Radar
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Solution Overview
Problem
Existing field devices for level measurement in high-frequency ranges above 60 GHz lack effective explosion protection and efficient signal transmission, leading to potential hazards and reduced signal quality.
Innovation Solution
A gas-tight waveguide coupling with a dielectric sealing element and a planar radiator element, where the waveguide is designed with a widened initial area to accommodate a larger radiation surface, ensuring gas-tight separation and improved signal quality by using a dielectric sealing element that is either milled out, cylindrical, conical, or stepped, and metallically coated for secure connections.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional coaxial conductor bushing is used for gas-tight coupling, then explosion protection is provided, but signal transmission efficiency deteriorates at frequencies above 60 GHz
Solution Approach 1:
A dielectric sealing element is introduced as an intermediary component between the waveguide and the measurement environment. This dielectric material provides gas-tight sealing while maintaining electromagnetic signal transmission at high frequencies, replacing the conventional metallic coaxial bushing that blocked effective signal propagation above 60 GHz.
Solution Approach 2:
The invention changes the material parameter of the sealing element from conductive metal to non-conductive dielectric material. This parameter change allows the sealing element to be transparent to high-frequency electromagnetic signals while still providing gas-tight explosion protection, resolving the contradiction between sealing effectiveness and signal transmission.
2Manufacturing precision
If the waveguide initial area is enlarged to accommodate larger radiator element, then signal quality improves, but device complexity increases
Solution Approach 1:
The waveguide initial area is enlarged in the radial dimension to accommodate a larger planar radiator element. This dimensional change allows the radiator element to achieve better impedance matching and wider bandwidth without increasing the longitudinal complexity of the waveguide structure. The enlarged cross-sectional area provides improved signal quality while maintaining manageable device complexity.
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 reliable explosion protection and enhanced signal quality with a relative bandwidth of over 5% at 79 GHz, ensuring safe and accurate level measurements in high-frequency applications.
Implementation Method 1
radiated by a planar radiator element of the waveguide coupling
Implementation Method 2
The waveguide coupling has a dielectric sealing element (111) which seals the waveguide (104, 105) in a gas-tight manner
Data Source
Figure 1~3
Figure 4~6
Figure 7~8
AI summary
The coupling (100) has a planar radiator element (102) i.e. patch antenna, arranged on a carrier plate (101) and for radiating an electromagnetic signal. Waveguides (105) transfer the radiated electromagnetic signal. A dielectric seal element (111) seals the waveguides in a gastight manner and made of a printed circuit board. The dielectric seal element comprises a stepped surface and a cylindrical- or a rectangular region at which the seal element is gastightly connected with the waveguides. The planar radiator element is arranged in or directly in front of an initial region (104). The dielectric seal element is a cylindrical- or rectangular plastic part and a cone shaped-, pyramidal-, twin-cone shaped or twin-pyramidal plastic part.