Microstrip waveguide converter for radar level meter
A waveguide converter and microstrip technology, applied in the microwave field, can solve the problems of difficult coaxial lines and small size, and achieve the effects of improving sensitivity and detection range, reducing assembly difficulty, and improving insertion loss and standing wave indicators.
Pending Publication Date: 2019-03-12
智驰华芯(无锡)传感科技有限公司 +1
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Problems solved by technology
In this structure, the signal needs to go through microstrip-coaxial and coaxial-waveguide conversion twice from the radio frequency circuit board to the horn antenna, which inevitably brings problems of insertion loss and return loss. For radar level gauges, Especially for radar level gauges working in FMCW (frequency modulated continuous wave) mode, the large insertion loss and poor standing wave of the signal directly affect the measurement distance and accuracy
At the same time, high-frequency radar level gauges are usually small in size, and both the microstrip-coaxial converter and the coaxial-waveguide converter are located in the housing of the level gauge, and it is difficult to install the coaxial line connecting the two converters during production. Big
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[0017] The specific embodiments of the present invention will be further described below in conjunction with the drawings.
[0018] This application discloses a microstrip waveguide converter for a radar level meter. The microstrip waveguide converter is based on a multilayer mixed voltage circuit board, and the multilayer mixed voltage circuit board is provided with a microstrip line, a coupling probe and Ground vias, ground vias penetrate through the multilayer hybrid circuit board, and the microstrip line and coupling probes are located on the top metal layer of the multilayer hybrid circuit board. The rectangular waveguide is pressed tightly on the bottom metal layer of the multilayer mixed-voltage circuit board by screws, and the microstrip line extends from the middle of the wide side of the rectangular waveguide cavity into the rectangular waveguide cavity and transforms into a coupling probe to achieve coupling. It is located in the rectangular waveguide cavity Except for...
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Abstract
The invention discloses a microstrip waveguide converter for a radar level meter, relating to the technical field of microwave. The converter can directly convert a microstrip signal into a waveguidesignal, and adopts a probe structure with an advantageous insertion loss to improve the insertion loss and standing wave index of the microwave signal from the PCB to the horn antenna transmission stage, thereby improving the sensitivity and detection range of the level meter. At the same time, the installation is realized all by screws, which reduces the assembly difficulty, eliminates the assembly of semi-steel coaxial cables in a narrow space, and improves the production efficiency.
Description
Technical field [0001] The invention relates to the field of microwave technology, in particular to a microstrip waveguide converter for radar level gauges. Background technique [0002] A radar level gauge used for liquid level or material level height measurement in an industrial field usually includes a level gauge body, a horn antenna, and a waveguide structure that connects the level gauge body and the horn antenna. The microwave signal on the radio frequency circuit board in the level meter body is converted to the horn antenna through the microstrip line. Usually this conversion is converted into a coaxial signal by a microstrip-coaxial converter installed on the radio frequency circuit board. The coaxial line is converted into a waveguide signal by the coaxial-waveguide converter at the other end of the coaxial line, and is transmitted to the horn antenna through the waveguide structure. In this structure, the signal from the radio frequency circuit board to the horn ant...
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Login to View More IPC IPC(8): H01P5/107
CPCH01P5/107
Inventor 靳文汇
Owner 智驰华芯(无锡)传感科技有限公司