CN109461999A - A kind of microstrip waveguide transition for radar levelmeter - Google Patents
A kind of microstrip waveguide transition for radar levelmeter Download PDFInfo
- Publication number
- CN109461999A CN109461999A CN201811542028.2A CN201811542028A CN109461999A CN 109461999 A CN109461999 A CN 109461999A CN 201811542028 A CN201811542028 A CN 201811542028A CN 109461999 A CN109461999 A CN 109461999A
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- Prior art keywords
- layer
- microstrip
- mixed pressure
- wiring board
- waveguide transition
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- 230000007704 transition Effects 0.000 title claims abstract description 25
- 239000000523 sample Substances 0.000 claims abstract description 23
- 230000008878 coupling Effects 0.000 claims description 23
- 238000010168 coupling process Methods 0.000 claims description 23
- 238000005859 coupling reaction Methods 0.000 claims description 23
- 239000002184 metal Substances 0.000 claims description 19
- 229910052751 metal Inorganic materials 0.000 claims description 19
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 5
- 229910052802 copper Inorganic materials 0.000 claims description 3
- 239000010949 copper Substances 0.000 claims description 3
- 239000000463 material Substances 0.000 claims description 3
- PCHJSUWPFVWCPO-UHFFFAOYSA-N gold Chemical compound [Au] PCHJSUWPFVWCPO-UHFFFAOYSA-N 0.000 claims 1
- 239000010931 gold Substances 0.000 claims 1
- 229910052737 gold Inorganic materials 0.000 claims 1
- 238000003780 insertion Methods 0.000 abstract description 9
- 230000037431 insertion Effects 0.000 abstract description 9
- 238000004519 manufacturing process Methods 0.000 abstract description 4
- 229910000831 Steel Inorganic materials 0.000 abstract description 3
- 230000035945 sensitivity Effects 0.000 abstract description 3
- 239000010959 steel Substances 0.000 abstract description 3
- 238000006243 chemical reaction Methods 0.000 description 2
- 239000011889 copper foil Substances 0.000 description 2
- 238000005259 measurement Methods 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 230000005540 biological transmission Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000005684 electric field Effects 0.000 description 1
- 230000005284 excitation Effects 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01P—WAVEGUIDES; RESONATORS, LINES, OR OTHER DEVICES OF THE WAVEGUIDE TYPE
- H01P5/00—Coupling devices of the waveguide type
- H01P5/08—Coupling devices of the waveguide type for linking dissimilar lines or devices
- H01P5/10—Coupling devices of the waveguide type for linking dissimilar lines or devices for coupling balanced with unbalanced lines or devices
- H01P5/107—Hollow-waveguide/strip-line transitions
Abstract
The invention discloses a kind of microstrip waveguide transitions for radar levelmeter, it is related to microwave technical field, micro-strip signal directly can be converted to waveguide signal by the converter, using the probe structure of Insertion Loss advantageously, Insertion Loss and standing wave index that microwave signal transmits the stage from PCB to electromagnetic horn can be improved, to improve the sensitivity and investigative range of level meter, simultaneously, all installed using screw, reduce assembly difficulty, the operation for assembling half steel coaxial cable in small space is eliminated, production efficiency is improved.
Description
Technical field
The present invention relates to microwave technical field, especially a kind of microstrip waveguide transition for radar levelmeter.
Background technique
The radar levelmeter for carrying out liquid level or controlling level measurement for industry spot generally includes level meter ontology, loudspeaker
Antenna and the waveguide junction component for connecting level meter ontology and electromagnetic horn.In level meter ontology on radio-frequency line plate
Microwave signal by microstrip line it is converted after be sent to electromagnetic horn, usually this conversion using be mounted on it is micro- on radio frequency circuit board
Band-coaxial converter is converted into coaxial signal, then is converted by coaxial line through the coaxial-waveguide converter of the coaxial line other end
Waveguide signal is transmitted on electromagnetic horn by waveguide junction component.In this configuration, signal is from radio frequency circuit board to loudspeaker day
Line, needs that coaxial by micro-strip-and coaxial-waveguide is converted twice, unavoidably brings Insertion Loss and return loss problem, right
In radar levelmeter, especially with FMCW (CW with frequency modulation) mode work radar levelmeter for, the biggish Insertion Loss of signal
Measurement distance and precision are directly affected with poor standing wave.Meanwhile the usual small volume of higher-frequency radar level meter, micro-strip-are coaxial
Converter and coaxial-waveguide converter are all located in level meter shell, when production installation connect two converters coaxial line it is difficult
It spends also larger.
Summary of the invention
The present inventor regarding to the issue above and technical need, proposes a kind of micro-strip waveguide transitions for radar levelmeter
Micro-strip signal directly can be converted to waveguide signal by device, the converter, using the probe structure of Insertion Loss advantageously, so that inserting
Damage and standing wave performance are obviously improved.
Technical scheme is as follows:
A kind of microstrip waveguide transition for radar levelmeter, the microstrip waveguide transition are based on multilayer mixed pressure route
Plate, microstrip line, coupling probe and ground via are provided on multilayer mixed pressure wiring board, and ground via runs through multilayer mixed pressure route
Plate, microstrip line and coupling probe are located at the top layer metallic layer of multilayer mixed pressure wiring board；Rectangular waveguide is pressed on multilayer by screw
The bottom metal layer of mixed pressure wiring board, it is intracavitary and become that microstrip line from the middle position of the broadside of rectangular wave guide cavity protrudes into rectangular waveguide
It is changed to coupling probe and realizes coupling, the multilayer mixed pressure wiring board positioned at rectangular wave guide cavity upright projection interior section removes top-level metallic
Outside the coupling probe of layer, remaining each layer metal layer is hollowed out, remaining each layer medium in addition to the dielectric layer below top layer metallic layer
Layer is also hollowed out；The short-circuit face structural member of microstrip waveguide transition is pressed on the top layer of multilayer mixed pressure wiring board by screw
Side.
Its further technical solution is that microstrip line passes through throat structure before protruding into rectangular wave guide cavity, throat structure
Width is 3 times of the width of microstrip line.
Its further technical solution is that rectangular waveguide uses standard BJ220 straight wave guide, and the length of rectangular wave guide cavity is
10.668mm width 4.318mm.
Its further technical solution is that coupling probe protrudes into rectangular wave guide cavity 1.65mm.
Its further technical solution is that the vertical range of surface to the short-circuit face structural member of microstrip line is operation wavelength
A quarter.
Its further technical solution is that multilayer mixed pressure wiring board uses four layers of mixed pressure circuit board structure, four layers of mixed pressure line
The hardened structure in road successively includes first medium floor, second dielectric layer and third dielectric layer, and the top of first medium layer is top-level metallic
Layer, the lower section of third dielectric layer are bottom metal layer, between first medium layer and second dielectric layer and second dielectric layer and the
It is respectively two layers of intermediate metal layer between three dielectric layers；First medium layer uses ROGERS RO4350B, other dielectric layers use
FR4 material.
Its further technical solution is, first medium layer with a thickness of 0.254mm, dielectric constant 3.66, four layers are mixed
The full plate thickness for pressing wiring board is 1.6mm, and the thickness of each layer metal layer is 1 ounce of copper thickness.
The method have the benefit that:
This application discloses a kind of microstrip waveguide transition for radar levelmeter, which can be directly by micro-strip
Signal is converted to waveguide signal, using the probe structure of Insertion Loss advantageously, can improve microwave signal from PCB to electromagnetic horn
The Insertion Loss and standing wave index in transmission stage, to improve the sensitivity and investigative range of level meter.Meanwhile all being pacified using screw
Dress, reduces assembly difficulty, eliminates the operation for assembling half steel coaxial cable in small space, improves production efficiency.
Detailed description of the invention
Fig. 1 is the stacking schematic cross-sectional view of multilayer mixed pressure wiring board.
Fig. 2 is the positive structure schematic of microstrip waveguide transition.
Fig. 3 is the structure schematic diagram of microstrip waveguide transition.
Specific embodiment
The following further describes the specific embodiments of the present invention with reference to the drawings.
This application discloses a kind of microstrip waveguide transition for radar levelmeter, which is based on more
Layer mixed pressure wiring board, microstrip line, coupling probe and ground via are provided on multilayer mixed pressure wiring board, and ground via runs through multilayer
Mixed pressure wiring board, microstrip line and coupling probe are located at the top layer metallic layer of multilayer mixed pressure wiring board.Rectangular waveguide is tight by screw
It is pressed in the bottom metal layer of multilayer mixed pressure wiring board, microstrip line protrudes into rectangular waveguide from the middle position of the broadside of rectangular wave guide cavity
Intracavitary and be transformed to coupling probe and realize coupling, the multilayer mixed pressure wiring board positioned at rectangular wave guide cavity upright projection interior section removes
Outside the coupling probe of top layer metallic layer, remaining each layer metal layer is hollowed out, in addition to the dielectric layer below top layer metallic layer remaining
Each layer dielectric layer is also hollowed out.As the circuit of this microstrip waveguide transition is a part of multilayer mixed pressure wiring board, micro-strip wave
The short-circuit face structural member for leading converter is also a part of multilayer mixed pressure wiring board, is pressed on multilayer mixed pressure route by screw
Above the top layer of plate, and the vertical range of the surface of microstrip line to short-circuit face structural member is a quarter of operation wavelength.
FMCW formula radar levelmeter of the application in particular for 24GHz, therefore the microstrip waveguide transition of the application
Working frequency range is 23GHz~26GHz, centre frequency 24.5GHz.Structure is described in detail with following examples in the application:
Using four layers of mixed pressure circuit board structure, schematic cross-sectional view is laminated referring to FIG. 1, four layers of mixed pressure circuit board structure
It successively include first medium layer 11, second dielectric layer 12 and third dielectric layer 13, the top of first medium layer is top layer metallic layer
14, the lower section of third dielectric layer 13 is bottom metal layer 15, and between first medium layer 11 and second dielectric layer 12 and second is situated between
It is respectively two layers of intermediate metal layer 16 between matter layer 12 and third dielectric layer 13.Each metal layer in the application is usually copper foil
Layer, reference layer are next layer of metal layer of top layer metallic layer 14, and the reference layer of top layer metallic layer 14 is continuous copper foil plane.The
One dielectric layer 11 uses ROGERS RO4350B, other dielectric layers 12 and 13 use FR4 material.First medium layer 11 with a thickness of
The full plate thickness of 0.254mm, dielectric constant 3.66, four layers of mixed pressure wiring board are 1.6mm, and the thickness of four layers of metal layer is 1
Ounce copper is thick.When stepped construction difference, numerical value can be different.The Facad structure figure of microstrip waveguide transition as shown in Figure 2, it is micro-
Width with line 21 is 0.52mm, and the width of microstrip line 21 is merely illustrative.The end of microstrip line 21 is transformed to coupling probe 22, coupling
The top for closing probe 22 is transitioned into the shapes such as round or rectangle from microstrip line 21, and implementation is not unique, the application without limitation,
Fig. 2 is by taking circle as an example, and circular radius is 0.4mm.Rectangular waveguide is assemblied in the other side of microstrip line 21 and coupling probe 22, this
Application uses standard BJ220 straight wave guide, and the size of rectangular wave guide cavity 23 is according to standard BJ220 straight wave guide size design, reality
Length be 10.668mm, width 4.318mm.In order to inhibit higher mode, microstrip line 21 protrudes into warp before rectangular wave guide cavity 23
Throat structure 24 is crossed, the width of throat structure 24 is 3 times of the width of microstrip line 21, the length of throat structure 24 in the embodiment
For 6mm.Microstrip line 21 protrudes into intracavitary, coupling probe 22 from the broadside middle position of rectangular wave guide cavity 23 after throat structure 24
Partially protrude into 1.65mm in rectangular wave guide cavity 23.Fig. 3 shows the backside structure figure of microstrip waveguide transition, it can be seen that in square
It is all hollowed out from the upward all FR4 dielectric layers of bottom metal layer as empty slot in shape waveguide cavity 23, the size of empty slot is
10.27mm*3.92mm, the chamfer radius at four angles is 1mm, small compared to the size that waveguide cavity metal part hollows out.
The working principle of the invention is: microstrip line is inserted into rectangular waveguide cavity, forms probe excitation, TE10 mould is rectangular wave
Total basic mode is led, the quasi- TEM mould on microstrip line will motivate the TE10 mould of rectangular waveguide to waveguide incidence, otherwise similarly, it is elected to
The working frequency and size for selecting rectangular waveguide make wherein there was only TE10 mould, and coupling probe is inserted into from waveguide broadside center, is set
At TE10 mould electric field maximum position, it can be made most tight with the TE10 mode coupling of rectangular waveguide.Therefore micro-strip-wave in the application
It leads directly conversion and significantly improves return loss and Insertion Loss, return loss is increased to -20dB from original -15dB, and Insertion Loss is from 2dB
0.5dB is reduced to hereinafter, so as to improve the sensitivity of radar levelmeter and investigative range.All pacified simultaneously using screw
Dress can also use flange plate structure with the shell of radar levelmeter, reduce assembly difficulty, eliminate and fill in small space
Operation with half steel coaxial cable, improves production efficiency.
The above are merely the preferred embodiments of the application, and present invention is not limited to the above embodiments.It is appreciated that this field
The oher improvements and changes that technical staff directly exports or associates without departing from the spirit and concept in the present invention,
It is considered as being included within protection scope of the present invention.
Claims (7)
1. a kind of microstrip waveguide transition for radar levelmeter, which is characterized in that the microstrip waveguide transition is based on more
Layer mixed pressure wiring board, is provided with microstrip line, coupling probe and ground via, the ground via on the multilayer mixed pressure wiring board
Through the multilayer mixed pressure wiring board, the microstrip line and the coupling probe are located at the top layer gold of the multilayer mixed pressure wiring board
Belong to layer；Rectangular waveguide is pressed on the bottom metal layer of the multilayer mixed pressure wiring board by screw, and the microstrip line is from rectangular wave
It is intracavitary and be transformed to the coupling probe and realize coupling that the rectangular waveguide is protruded into the middle position of the broadside of guide cavity, is located at described
The multilayer mixed pressure wiring board of rectangular wave guide cavity upright projection interior section in addition to the coupling probe of the top layer metallic layer,
Remaining each layer metal layer is hollowed out, remaining each layer dielectric layer is also hollowed out in addition to the dielectric layer below the top layer metallic layer；Institute
The short-circuit face structural member for stating microstrip waveguide transition is pressed on above the top layer of the multilayer mixed pressure wiring board by screw.
2. microstrip waveguide transition according to claim 1, which is characterized in that the microstrip line protrudes into the rectangular waveguide
Pass through throat structure before chamber, the width of the throat structure is 3 times of the width of the microstrip line.
3. microstrip waveguide transition according to claim 1, which is characterized in that the rectangular waveguide uses standard BJ220
Straight wave guide, the length of the rectangular wave guide cavity are 10.668mm, width 4.318mm.
4. microstrip waveguide transition according to claim 3, which is characterized in that the coupling probe protrudes into the rectangular wave
Guide cavity 1.65mm.
5. microstrip waveguide transition according to claim 1, which is characterized in that the surface of the microstrip line to the short circuit
The vertical range of face structural member is a quarter of operation wavelength.
6. microstrip waveguide transition according to claim 1, which is characterized in that the multilayer mixed pressure wiring board uses four layers
Mixed pressure circuit board structure, four layers of mixed pressure circuit board structure successively include first medium layer, second dielectric layer and third medium
Layer, the top of the first medium layer are the top layer metallic layer, and the lower section of the third dielectric layer is the bottom metal layer,
Distinguish between the first medium layer and the second dielectric layer and between the second dielectric layer and the third dielectric layer
For two layers of intermediate metal layer；The first medium layer uses ROGERS RO4350B, other dielectric layers use FR4 material.
7. microstrip waveguide transition according to claim 6, which is characterized in that the first medium layer with a thickness of
The full plate thickness of 0.254mm, dielectric constant 3.66, four layers of mixed pressure wiring board are 1.6mm, and the thickness of each layer metal layer is 1
Ounce copper is thick.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811542028.2A CN109461999A (en) | 2018-12-17 | 2018-12-17 | A kind of microstrip waveguide transition for radar levelmeter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811542028.2A CN109461999A (en) | 2018-12-17 | 2018-12-17 | A kind of microstrip waveguide transition for radar levelmeter |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN109461999A true CN109461999A (en) | 2019-03-12 |
Family
ID=65613516
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201811542028.2A Pending CN109461999A (en) | 2018-12-17 | 2018-12-17 | A kind of microstrip waveguide transition for radar levelmeter |
Country Status (1)
| Country | Link |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110261756A (en) * | 2019-05-31 | 2019-09-20 | 惠州市德赛西威汽车电子股份有限公司 | The transformational structure of millimetre-wave radar circuit board radio frequency testing |
| CN110518340A (en) * | 2019-08-30 | 2019-11-29 | 维沃移动通信有限公司 | A kind of antenna element and terminal device |
| CN113721127A (en) * | 2021-08-18 | 2021-11-30 | 荣耀终端有限公司 | Circuit board and detection system |
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| EP1367668A1 (en) * | 2002-05-30 | 2003-12-03 | Siemens Information and Communication Networks S.p.A. | Broadband microstrip to waveguide transition on a multilayer printed circuit board |
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| CN209088044U (en) * | 2018-12-17 | 2019-07-09 | 智驰华芯(无锡)传感科技有限公司 | A kind of microstrip waveguide transition for radar levelmeter |
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2018
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| EP1367668A1 (en) * | 2002-05-30 | 2003-12-03 | Siemens Information and Communication Networks S.p.A. | Broadband microstrip to waveguide transition on a multilayer printed circuit board |
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| CN110261756A (en) * | 2019-05-31 | 2019-09-20 | 惠州市德赛西威汽车电子股份有限公司 | The transformational structure of millimetre-wave radar circuit board radio frequency testing |
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