CN110261756B - Conversion structure for RF testing of millimeter wave radar circuit boards - Google Patents
Conversion structure for RF testing of millimeter wave radar circuit boards Download PDFInfo
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- CN110261756B CN110261756B CN201910468201.7A CN201910468201A CN110261756B CN 110261756 B CN110261756 B CN 110261756B CN 201910468201 A CN201910468201 A CN 201910468201A CN 110261756 B CN110261756 B CN 110261756B
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- millimeter wave
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/28—Testing of electronic circuits, e.g. by signal tracer
- G01R31/282—Testing of electronic circuits specially adapted for particular applications not provided for elsewhere
- G01R31/2822—Testing of electronic circuits specially adapted for particular applications not provided for elsewhere of microwave or radiofrequency circuits
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/28—Testing of electronic circuits, e.g. by signal tracer
- G01R31/2832—Specific tests of electronic circuits not provided for elsewhere
- G01R31/2836—Fault-finding or characterising
- G01R31/2844—Fault-finding or characterising using test interfaces, e.g. adapters, test boxes, switches, PIN drivers
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- 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
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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Waveguides (AREA)
- Radar Systems Or Details Thereof (AREA)
Abstract
本申请公开了一种毫米波雷达电路板射频测试的转换结构，包括结构主体以及圆弧弯波导。该结构主体包括介质层、形成短路面的覆铜层、设于所述介质层上的匹配结构以及固定在所述介质层上的固定座；所述覆铜层与所述匹配结构分别设于所述介质层的两侧，所述匹配结构的外围设有若干接地的金属过孔；所述固定座在与所述介质层连接一侧设有转换槽；该圆弧弯波导，一端与所述转换槽的一端连通，另一端用于与射频测试设备连接，以实现对毫米波雷达电路板的射频测试。本申请实施例可以降低了电路板射频测试的转换结构的复杂度，进而方便测试人员在射频测试工作中使用。
The present application discloses a conversion structure for radio frequency testing of a millimeter-wave radar circuit board, including a structural body and an arc-bend waveguide. The structural body includes a dielectric layer, a copper-clad layer forming a short-circuit surface, a matching structure arranged on the dielectric layer, and a fixing seat fixed on the dielectric layer; the copper-clad layer and the matching structure are respectively arranged on both sides of the dielectric layer, and a plurality of grounded metal vias are arranged on the periphery of the matching structure; the fixing seat is provided with a conversion groove on the side connected to the dielectric layer; the arc-bend waveguide, one end of which is connected to one end of the conversion groove, and the other end is used to connect to the radio frequency test equipment to realize the radio frequency test of the millimeter-wave radar circuit board. The embodiment of the present application can reduce the complexity of the conversion structure of the radio frequency test of the circuit board, thereby facilitating the use of testers in radio frequency testing work.
Description
Technical Field
The application relates to the field of radio frequency equipment, in particular to a conversion structure for radio frequency test of a millimeter wave radar circuit board.
Background
With the development of automatic driving assistance systems and future unmanned driving technologies, millimeter wave radars will be more and more popular in the automotive market in the future due to some advantages of millimeter wave radars over cameras and lidars.
Radio frequency testing of a millimeter wave radar PCB (Printed Circuit Board: circuit board) end, particularly testing of PCB radio frequency performance in a frequency range of 76GHz-81 GHz, inevitably requires a waveguide conversion interface for direct connection between a PCB radio frequency interface and an instrument interface, as shown in figure 1. Since the conversion structure principle is almost the same as that of the waveguide and the coaxial cable, the conversion structure is a conversion form that the microstrip line probe 111 formed by the microstrip line 110 is inserted into the waveguide port 210 close to the waveguide short-circuit surface 211, but the structure is complex to process and difficult to install, and in practical application, additional accessories are needed to be used as a cavity to use the radio frequency test at the circuit board end.
Therefore, the existing conversion structure for the radio frequency test of the circuit board is complex to use, and is not beneficial to the use of testers in the radio frequency test work.
Disclosure of Invention
The application provides a conversion structure for radio frequency test of a millimeter wave radar circuit board, which can be conveniently used by a tester in radio frequency test work.
The embodiment of the application provides a conversion structure for radio frequency test of a millimeter wave radar circuit board, which comprises the following components:
The structure body comprises a medium layer, a copper-clad layer forming a short circuit surface, a matching structure arranged on the medium layer and a fixing seat fixed on the medium layer, wherein the copper-clad layer and the matching structure are respectively arranged on two sides of the medium layer, a plurality of grounded metal through holes are arranged on the periphery of the matching structure, a conversion groove is arranged on one side, connected with the medium layer, of the fixing seat, and
And one end of the arc bent waveguide is communicated with one end of the conversion groove, and the other end of the arc bent waveguide is connected with radio frequency test equipment so as to realize radio frequency test of the millimeter wave radar circuit board.
Optionally, the matching structure is a grounded coplanar waveguide matching structure or a microstrip line matching structure.
Optionally, a clearance area extends outwards from the periphery of the matching structure, the shape of the clearance area at the matching structure is matched with the shape of the notch of the conversion part, and the metal runner Kong Wei is arranged at the periphery of the clearance area.
Optionally, the matching structure is provided with a plurality of rows of metal vias with equal space in a direction of vertically outward from each edge, and the trend of each row of metal vias is parallel to the edge of the matching structure.
Optionally, the edge that the structure main part is connected with the fixing base is still equipped with round metal via hole.
Optionally, the conversion slot includes an introduction portion and a conversion portion connected to each other, and the matching structure includes a strip portion and a matching portion;
When the fixing seat is connected with the dielectric layer, the leading-in part extends along the extending direction of the strip-shaped part of the matching structure, the conversion part is communicated with the arc-shaped curved waveguide, and a connection part is arranged between the conversion part and the leading-in part and is opposite to the conversion part between the strip-shaped part and the matching part in the matching structure.
Optionally, the engagement portion has a groove depth smaller than a groove depth of other positions of the introduction portion.
Optionally, a clearance area extends outwards from the periphery of the matching structure, the shape of the clearance area at the matching structure is matched with the shape of the notch of the conversion part, and the metal gap Kong Wei is arranged at the periphery of the clearance area;
the width of the clearance area of the engagement portion gradually increases from the strip portion toward the matching structure.
Optionally, the specification of the arc curved waveguide is matched with the frequency band of the millimeter wave.
Optionally, the frequency band of the millimeter wave is 76GHz-81 GHz.
As can be seen from the above, in the embodiment of the present application, the conversion is achieved by matching the curved waveguide of the arc in the conversion structure with the structural body without inserting the microstrip line probe into the waveguide port, so that the radio frequency conversion form of the millimeter wave antenna is changed, the complexity of the conversion structure of the radio frequency test of the circuit board is reduced, and the use of the test personnel in the radio frequency test work is facilitated.
Drawings
Fig. 1 is a schematic structural diagram of a conversion structure in the prior art according to an embodiment of the present application.
Fig. 2 is a schematic structural diagram of a conversion structure for radio frequency testing of a millimeter wave radar circuit board according to an embodiment of the present application.
Fig. 3 is a schematic top view of a conversion structure for radio frequency testing of a millimeter wave radar circuit board according to an embodiment of the present application.
Fig. 4 is a schematic cross-sectional view of a section A-A of a conversion structure for radio frequency testing of a millimeter wave radar circuit board according to an embodiment of the present application.
Fig. 5 is a schematic diagram of a part of a conversion structure for radio frequency testing of a millimeter wave radar circuit board according to an embodiment of the present application.
Detailed Description
The preferred embodiments of the present application will be described in detail below with reference to the attached drawings so that the advantages and features of the present application will be more readily understood by those skilled in the art, thereby more clearly defining the scope of the present application.
Referring to fig. 2, a conversion structure for radio frequency testing of a millimeter wave radar circuit board according to an embodiment of the present application is shown.
As shown in fig. 2, the conversion structure for radio frequency test of millimeter wave radar circuit board comprises a structural main body 1 and an arc bending waveguide 2 fixedly connected with the structural main body 1.
The structural main body 1 comprises a dielectric layer 11, a copper-clad layer 12 forming a short road surface, a matching structure 13 arranged on the dielectric layer 11 and a fixing seat fixed on the dielectric layer, wherein the copper-clad layer 12 and the matching structure 13 are respectively arranged on two sides of the dielectric layer 11, a plurality of metal through holes 14 are arranged on the periphery of the matching structure 13, and the metal through holes 14 are coupled with the copper-clad layer 12. The fixing base 15 may be a columnar structure, a prismatic table structure, or other types of structures, which is not limited in the present application.
The copper-clad layer 12 may be grounded to form a short road surface, the metal via 14 may be grounded by being connected to ground, and the structural body 1 may be grounded through the metal via 14. The dielectric layer 11 may be a conventional PCB board or other non-conductive material to provide a distance between the copper-clad layer 12 and the antenna. The thickness of the dielectric layer 11 can be set according to the radio frequency requirement.
Specifically, the matching structure 13 of the structural body 1 may be a grounded coplanar waveguide matching structure 13 or a microstrip line matching structure 13. The frequency band of the millimeter wave matching structure is located in 76GHz-81 GHz. In some embodiments, when the matching structure 13 of the structural body 1 is a grounded coplanar waveguide matching structure 13, the copper-clad layer 12 is located on two sides of the dielectric layer 11, and the uniformity of the grounding performance is achieved through the metal via.
The microstrip line matching structure 13 is formed by processing a signal conductor line on the top of the dielectric layer 11, and a ground conductor surface on the bottom of the dielectric layer 11. In the grounded coplanar waveguide matching structure 13, two additional ground planes are added on top of the dielectric layer 11, and the signal conductors are located in the two ground planes and are spaced apart from each other, except for the ground plane at the bottom of the dielectric layer 11. Consistent grounding performance is achieved by connecting the top and bottom ground planes through metal vias 14.
It can be understood that the specific form of the millimeter wave matching structure and the frequency band of the millimeter wave matching structure can be set according to the actual situation.
The arc-shaped bent waveguide 2 is fixedly connected with the dielectric layer 11. In some embodiments, the dimensions of the curved waveguide 2 match the frequency band of the millimeter wave. For example, if the millimeter wave band is 76 ghz-81 ghz, the curved waveguide 2 should be configured to conduct millimeter wave signals in the millimeter wave band, so as to reduce loss in the conducting process. The fixing base 15 may be fixedly connected to the structural body 1 by setting screws, buckles or other fixing members in the fixing holes 152. Further, the fixing base 15 and the curved waveguide 2 may be an integral structure.
Referring to fig. 3, a top view structure of a conversion structure for radio frequency testing of a millimeter wave radar circuit board provided by the embodiment of the application is shown, and referring to fig. 4, a cross-sectional a-section cross-sectional structure of a conversion structure for radio frequency testing of a millimeter wave radar circuit board provided by the embodiment of the application is shown.
Referring to fig. 3-4, a conversion groove 151 opposite to the matching structure 13 is disposed on a side of the fixing base 15 connected to the dielectric layer 1, one end of the conversion groove 151 is connected to one end of the curved arc waveguide 2, and the other end of the curved arc waveguide 2 is connected to the radio frequency testing device, so as to convert the radio frequency emitted by the matching structure 13 into the radio frequency testing device.
Specifically, when the fixing base 15 is fixedly connected with the structural body 1, the position of the conversion slot 151 of the fixing base 15 is opposite to the matching structure, so that the radio frequency generated by the matching structure 13 is converted to the radio frequency test device through the conversion slot 151.
In some embodiments, the matching structure 13 may include a strip portion 131 and a matching portion 132, and the conversion groove 151 extends to be close to one end of the curved waveguide 2 along an extending direction of the strip portion 131 and communicates with one end of the curved waveguide 2. The matching portion 132 of the matching structure 13 may be disposed opposite to one end of the curved waveguide 2.
Specifically, the transition groove 151 may include an introduction portion 151a, an engagement portion 151b, and a transition portion 151c connected to each other, the introduction portion 151a extending along the extending direction of the strip portion 131 of the matching structure 13 when the holder 15 is connected to the dielectric layer 1, the transition portion 151c communicating with the curved waveguide 2, the engagement portion 151b being provided between the introduction portion 151a and the transition portion 151c and opposite to the transition 133 between the strip portion 131 and the matching portion 132 in the matching structure 13.
Further, the groove depth of the engagement portion 151b is smaller than the groove depth of the introduction portion 151a to achieve radio frequency conversion. In some embodiments, the groove depth of the introducing portion 151a is between 1.5cm and 3.5 cm, and the groove depth of the engaging portion 151b is between 0.1cm and 0.8 cm. The groove width of the lead-in portion 151a may be slightly wider than the engagement portion 151 b.
By the structure, the radio frequency signal generated by the structural main body 1 can be smoothly converted, and the radio frequency signal is converted into the arc-shaped curved waveguide 2 through the conversion groove 151, so that the radio frequency conversion effect of the matching structure 13 is improved.
To further ensure the rf conversion effect, in some embodiments, a clearance area 17 extends outwardly from the periphery of the matching structure 13, the clearance area forming part of the matching structure. The shape of the clearance area 17 is matched with the shape of the notch of the conversion groove 151, and the metal via 14 is arranged around the periphery of the clearance area 17. Preferably, the width of the clearance area 17 of the transition 133 may also gradually increase from the strip portion 131 toward the mating portion 132.
Referring to fig. 5, a part of a structure of a conversion structure for radio frequency testing of a millimeter wave radar circuit board according to an embodiment of the present application is shown.
In some embodiments, as shown in fig. 5, the matching structure 13 is arranged with a plurality of columns of metal vias 14 with equal spacing along the vertical outward direction on each side, and each column of metal vias 14 runs parallel to the edge of the matching structure 13. The structural body 1 further includes a mounting hole 16 fixedly coupled to the fixing hole 152 of the conversion structure 2.
Specifically, 3-5 columns of metal vias 14 may extend from each edge of the matching structure 13, where the metal vias 14 may further improve the grounding performance of the matching structure 13. Further, the spacing between each two columns of metal vias 14 may be related to the frequency band of millimeter waves to better match the radio frequency signals.
In other embodiments, as shown in fig. 5, the structural body 1 is further provided with a circle of metal vias 14 at the edge connected with the fixing base 15. The conversion effect of the radio frequency can be further improved by the ring of metal vias 14.
In the use process, the matching structure 13 can be firstly arranged on the PCB board, a copper-clad layer is laid on the other surface of the PCB board (if the matching structure 13 is a grounded coplanar waveguide matching structure, copper-clad layers are laid on both surfaces of the PCB board), the copper-clad layer is grounded, and the periphery of the matching structure 13 is provided with grounded metal vias 14 to complete the setting of the matching structure 13. Then, the fixing base 15 with the arc-shaped curved waveguide is installed on the PCB board, so that the conversion groove 151 of the fixing base 15 is opposite to the matching structure, and then the other end of the arc-shaped curved waveguide 2 of the fixing base 15 is connected to the radio frequency test equipment. The mode does not need to be inserted into a waveguide port by a microstrip line probe to realize conversion, so that the test structure and the use complexity are reduced.
During testing, the radio frequency signal sent by the matching structure 13 is subjected to radio frequency matching conversion through the conversion groove 151 of the fixing seat 15, and is converted into radio frequency testing equipment from the arc curved waveguide 2, so that radio frequency testing of the millimeter wave radar circuit board is realized.
As can be seen from the above, in the embodiment of the present application, the conversion is achieved by matching the curved waveguide of the arc in the conversion structure with the structural body without inserting the microstrip line probe into the waveguide port, so that the radio frequency conversion form of the millimeter wave antenna is changed, the complexity of the conversion structure of the radio frequency test of the circuit board is reduced, and the use of the test personnel in the radio frequency test work is facilitated.
The embodiments of the present application have been described in detail with reference to the drawings, but the present application is not limited to the above embodiments, and various changes can be made within the knowledge of those skilled in the art without departing from the spirit of the present application.
Claims (6)
1. The utility model provides a conversion structure of millimeter wave radar circuit board radio frequency test which characterized in that includes:
The structure main body comprises a medium layer, a copper-clad layer forming a short circuit surface, a matching structure arranged on the medium layer and a fixing seat fixed on the medium layer, wherein the copper-clad layer and the matching structure are respectively arranged on two sides of the medium layer, a plurality of grounded metal through holes are arranged on the periphery of the matching structure, a conversion groove opposite to the matching structure is arranged on one side, connected with the medium layer, of the fixing seat, and
The arc bending waveguide is communicated with one end of the conversion groove, and the other end of the arc bending waveguide is used for being connected with radio frequency test equipment so as to realize radio frequency test of the millimeter wave radar circuit board;
The matching structure comprises a strip-shaped part and a matching part, the conversion groove extends along the direction of the strip-shaped part and is communicated with one end of the arc-shaped curved waveguide, and the matching part is arranged opposite to one end of the arc-shaped curved waveguide;
The transition groove comprises an introduction part, a connection part and a transition part which are connected with each other, wherein the introduction part extends along the extending direction of the strip-shaped part, and the transition part is communicated with the arc-shaped curved waveguide;
The specification of the arc curved waveguide is matched with the frequency band of the millimeter wave, the groove depth of the connecting part is smaller than that of the guiding part, the groove width of the guiding part is larger than that of the connecting part, and the groove height of the guiding part is larger than that of the connecting part.
2. The conversion structure for radio frequency testing of millimeter wave radar circuit boards according to claim 1, wherein the matching structure is a grounded coplanar waveguide matching structure or a microstrip matching structure.
3. The converting structure for radio frequency testing of millimeter wave radar circuit board according to claim 2, wherein said matching structure is provided with a plurality of rows of metal vias of equal spacing in a direction perpendicular to the outward direction of each edge, and each row of said metal vias is oriented parallel to the edge of said matching structure.
4. The converting structure for radio frequency testing of millimeter wave radar circuit board according to claim 3, wherein the structural body is further provided with a circle of metal via holes at the edge connected with the fixing seat.
5. The converting structure for radio frequency testing of millimeter wave radar circuit board according to claim 1, wherein a clearance area extends outwards from the periphery of said matching structure, the shape of the clearance area at said matching portion matches the shape of the notch of said converting portion, and said metal vias Kong Wei are provided at the periphery of said clearance area;
the width of the clearance area at the transition gradually increases from the strip-shaped portion toward the matching structure.
6. The conversion structure for radio frequency testing of a millimeter wave radar circuit board according to claim 5, wherein the frequency band of the millimeter wave is 76 ghz-81 ghz.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201910468201.7A CN110261756B (en) | 2019-05-31 | 2019-05-31 | Conversion structure for RF testing of millimeter wave radar circuit boards |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201910468201.7A CN110261756B (en) | 2019-05-31 | 2019-05-31 | Conversion structure for RF testing of millimeter wave radar circuit boards |
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| CN110261756B true CN110261756B (en) | 2025-01-07 |
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| CN114142197A (en) * | 2021-12-15 | 2022-03-04 | 深圳市道通智能汽车有限公司 | Millimeter wave matching load based on grounded coplanar waveguide transmission line and millimeter wave radar |
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| CN207967269U (en) * | 2018-03-08 | 2018-10-12 | 广州合智瑞达科技有限公司 | A kind of Waveguide-microbelt converter suitable for V/W wave bands |
| CN210923886U (en) * | 2019-05-31 | 2020-07-03 | 惠州市德赛西威汽车电子股份有限公司 | Conversion structure for millimeter wave radar circuit board radio frequency test |
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| CN201134491Y (en) * | 2007-10-18 | 2008-10-15 | 北京天瑞星际技术有限公司 | Probe converting microstrip to wave-guide, amplifier and digital microwave outdoor unit |
| CN102074772B (en) * | 2011-01-07 | 2014-01-29 | 中国电子科技集团公司第十研究所 | Strip line waveguide switch |
| JP6526509B2 (en) * | 2015-07-23 | 2019-06-05 | 株式会社東芝 | Waveguide bend and radio equipment |
| CN105514556A (en) * | 2015-12-29 | 2016-04-20 | 大连楼兰科技股份有限公司 | Conversion device and method between microstrip line and metal rectangular waveguide |
| CN207303311U (en) * | 2017-10-09 | 2018-05-01 | 上海英恒电子有限公司 | Microstrip waveguide transition for E wave bands |
| CN208507906U (en) * | 2018-07-27 | 2019-02-15 | 武汉虹信通信技术有限责任公司 | A kind of micro-strip Waveguide conversion device and radio circuit |
| CN109193092A (en) * | 2018-10-24 | 2019-01-11 | 云南大学 | Snakelike substrate integration groove gap waveguide structure |
| CN109449550A (en) * | 2018-11-28 | 2019-03-08 | 北京遥测技术研究所 | A kind of W frequency range waveguide-strip line transformational structure |
| CN109461999A (en) * | 2018-12-17 | 2019-03-12 | 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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| CN207967269U (en) * | 2018-03-08 | 2018-10-12 | 广州合智瑞达科技有限公司 | A kind of Waveguide-microbelt converter suitable for V/W wave bands |
| CN210923886U (en) * | 2019-05-31 | 2020-07-03 | 惠州市德赛西威汽车电子股份有限公司 | Conversion structure for millimeter wave radar circuit board radio frequency test |
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