CN114142197A - Millimeter wave matching load based on grounded coplanar waveguide transmission line and millimeter wave radar - Google Patents
Millimeter wave matching load based on grounded coplanar waveguide transmission line and millimeter wave radar Download PDFInfo
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- CN114142197A CN114142197A CN202111537177.1A CN202111537177A CN114142197A CN 114142197 A CN114142197 A CN 114142197A CN 202111537177 A CN202111537177 A CN 202111537177A CN 114142197 A CN114142197 A CN 114142197A
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01P—WAVEGUIDES; RESONATORS, LINES, OR OTHER DEVICES OF THE WAVEGUIDE TYPE
- H01P1/00—Auxiliary devices
- H01P1/24—Terminating devices
- H01P1/26—Dissipative terminations
- H01P1/264—Waveguide terminations
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S13/00—Systems using the reflection or reradiation of radio waves, e.g. radar systems; Analogous systems using reflection or reradiation of waves whose nature or wavelength is irrelevant or unspecified
- G01S13/88—Radar or analogous systems specially adapted for specific applications
- G01S13/93—Radar or analogous systems specially adapted for specific applications for anti-collision purposes
- G01S13/931—Radar or analogous systems specially adapted for specific applications for anti-collision purposes of land vehicles
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Abstract
The invention discloses a millimeter wave matching load based on a grounded coplanar waveguide transmission line and a millimeter wave radar, and relates to the field of millimeter wave radars. The millimeter wave matching load comprises a lower metal ground, a dielectric substrate, a grounding coplanar waveguide transmission line and a wave absorbing module; the dielectric substrate is arranged on the lower metal ground; the grounded coplanar waveguide transmission line is arranged above the medium substrate, transmits energy to the wave-absorbing module, and interacts with the wave-absorbing module to perform impedance matching; the grounding coplanar waveguide transmission line comprises a plurality of metalized through holes and a coplanar metal ground, wherein the metalized through holes penetrate through the coplanar metal ground, the dielectric substrate and the lower layer metal ground, so that the metalized through holes are electrically connected with the coplanar metal ground and the lower layer metal ground; the wave absorbing module is fixedly arranged on the coplanar metal ground, is in contact with the grounded coplanar waveguide transmission line and absorbs energy transmitted from the grounded coplanar waveguide transmission line. Therefore, the millimeter wave matching load is miniaturized and integrated, and is easy to integrate with a microstrip antenna or a millimeter wave microstrip circuit.
Description
Technical Field
The invention relates to the technical field of millimeter wave radars, in particular to a millimeter wave matching load based on a grounded coplanar waveguide transmission line and a millimeter wave radar.
Background
The matching load is a termination device which absorbs all incident wave power, and is equivalent to a characteristic impedance line connected with the termination, and the frequency band is wide enough.
The matched load is a device commonly used in design and test of a microstrip antenna or a millimeter wave microstrip circuit. At present, vehicle-mounted millimeter wave radars work at 76-81GHz, and the sizes of antennas and circuits are small, so that millimeter wave matched loads are required to be miniaturized and integrated.
The traditional matched load is waveguide matched load, the matching performance of the traditional matched load is superior, but the waveguide matched load is large in size and weight, difficult to integrate, incapable of realizing miniaturization and integration, limited by the manufacturing process, high in cost and incapable of meeting the requirements of millimeter wave vehicle-mounted radars.
Disclosure of Invention
The embodiment of the invention aims to provide a millimeter wave matching load based on a grounded coplanar waveguide transmission line and a millimeter wave radar, wherein the grounded coplanar waveguide transmission line and a wave-absorbing module form the millimeter wave matching load, so that the millimeter wave matching load can realize miniaturization and integration, is easy to integrate with a microstrip antenna or a millimeter wave microstrip circuit, has low manufacturing cost, and is very suitable for a vehicle-mounted millimeter wave radar with the working frequency of 76-81 GHz.
In order to solve the above technical problems, embodiments of the present invention provide the following technical solutions: a millimeter wave matched load based on a grounded coplanar waveguide transmission line, the millimeter wave matched load comprising: the lower metal ground, the dielectric substrate, the grounded coplanar waveguide transmission line and the wave-absorbing module; wherein:
the dielectric substrate is arranged on the lower metal ground;
the grounded coplanar waveguide transmission line is arranged above the medium substrate and used for transmitting energy to the wave absorbing module and interacting with the wave absorbing module to perform impedance matching; the grounding coplanar waveguide transmission line comprises a plurality of metalized through holes and a coplanar metal ground, wherein the metalized through holes penetrate through the coplanar metal ground, the dielectric substrate and the lower layer metal ground, so that the metalized through holes are electrically connected with the coplanar metal ground and the lower layer metal ground;
the wave absorbing module is fixedly arranged on the coplanar metal ground, so that the wave absorbing module is in contact with the grounded coplanar waveguide transmission line and absorbs energy transmitted from the grounded coplanar waveguide transmission line.
Optionally, the coplanar metal ground extends inward from one side to form a through opening; the wave absorbing module is installed above the through opening of the coplanar metal ground.
Optionally, the grounded coplanar waveguide transmission line further comprises an input port, a transmission section and a tuning section; one end of the transmission section is connected with the input port, and the other end of the transmission section is connected with the tuning section; the tuning section is completely positioned below the wave absorbing module; wherein:
the input port is used for providing an input interface for receiving external energy and inputting the energy into the transmission section connected with the input port;
the transmission line is used for transmitting input energy to the tuning section;
and the tuning section is used for transmitting the input energy to the wave-absorbing module which is in contact with the tuning section for impedance matching.
Optionally, the transmission section and the tuning section constitute a grounded coplanar waveguide signal line, the shape of the grounded coplanar waveguide signal line matches the shape of the through opening of the coplanar metal ground, and a gap for signal transmission is provided between the grounded coplanar waveguide signal line and the through opening of the coplanar metal ground;
and a plurality of metalized through holes are distributed around the outer side of the through opening of the coplanar metal ground.
Optionally, the transmission section is entirely outside the wave absorbing module and does not extend below the wave absorbing module; or one part of the transmission section extends into the lower part of the wave absorbing module.
Optionally, the shape of the tuning section comprises one of: rectangular, fan-shaped, oval.
Optionally, the wave absorbing module is fixedly installed on the coplanar metal ground, and specifically includes: the wave-absorbing module is fixed on the coplanar metal ground through glue.
Optionally, the wave absorbing module is fixedly installed on the coplanar metal ground, and specifically includes: the wave absorbing module is fixed on the coplanar metal ground through a mounting fixture.
Optionally, the wave absorbing module is fixedly installed in the center of the coplanar metal ground.
In order to solve the above technical problems, embodiments of the present invention further provide the following technical solutions: a millimeter wave radar comprises a microstrip antenna or a millimeter wave microstrip circuit, wherein the microstrip antenna or the millimeter wave microstrip circuit comprises a millimeter wave matching load in any embodiment of the invention.
Compared with the prior art, the millimeter wave matching load and the millimeter wave radar based on the grounded coplanar waveguide transmission line provided by the embodiment of the invention provide the millimeter wave matching load based on the grounded coplanar waveguide, and the millimeter wave matching load comprises a lower metal ground, a dielectric substrate, a grounded coplanar waveguide transmission line and a wave-absorbing module; the dielectric substrate is arranged on the lower metal ground; the grounding coplanar waveguide transmission line is arranged above the dielectric substrate and comprises a plurality of metalized through holes and a coplanar metal ground, and the metalized through holes penetrate through the coplanar metal ground, the dielectric substrate and the lower layer metal ground so as to electrically connect the metalized through holes with the coplanar metal ground and the lower layer metal ground; the wave absorbing module is fixedly arranged on the coplanar metal ground, is in contact with the grounded coplanar waveguide transmission line, absorbs energy transmitted from the grounded coplanar waveguide transmission line, and interacts with the grounded coplanar waveguide transmission line to perform impedance matching. Therefore, the grounded coplanar waveguide transmission line and the wave-absorbing module form a millimeter wave matching load, the structure is simple, the size is small, the miniaturization and the integration can be realized, the millimeter wave matching load is easy to integrate with a microstrip antenna or a millimeter wave microstrip circuit, the manufacturing cost is low, the millimeter wave matching load has low reflectivity when working at 76-81GHz, the reflectivity is less than-36 dB, and the millimeter wave matching load is very suitable for a vehicle-mounted millimeter wave radar with the working frequency of 76-81 GHz.
Drawings
One or more embodiments are illustrated by way of example in the accompanying drawings, which correspond to the figures in which like reference numerals refer to similar elements and which are not to scale unless otherwise specified.
FIG. 1 is a schematic structural diagram of a millimeter wave matching load based on a grounded coplanar waveguide transmission line according to the present invention;
FIG. 2 is a schematic diagram of a specific structure of a millimeter wave matching load based on a grounded coplanar waveguide transmission line according to the present invention;
FIG. 3 is a schematic perspective view of a millimeter wave matching load based on a grounded coplanar waveguide transmission line according to the present invention;
FIG. 4 is a schematic diagram of the effect of impedance matching of a millimeter wave matching load based on a grounded coplanar waveguide transmission line, which works at 76-81 GHz;
fig. 5 is a schematic diagram illustrating the effect of different lengths lA on impedance matching of a millimeter wave matching load wave-absorbing module based on a grounded coplanar waveguide transmission line provided by the invention;
FIG. 6 is a schematic diagram of the effect of different widths wA on impedance matching of a millimeter wave matching load wave-absorbing module based on a grounded coplanar waveguide transmission line according to the present invention;
FIG. 7 is a schematic diagram of the effect of different thicknesses tA on impedance matching of a millimeter wave matching load wave-absorbing module based on a grounded coplanar waveguide transmission line according to the present invention;
fig. 8 is a schematic structural diagram of a millimeter wave radar provided by the present invention.
Reference numerals:
Coplanar metal ground 135 through opening 1351
Wave-absorbing module 14 gap 2
Detailed Description
In order to facilitate an understanding of the invention, the invention is described in more detail below with reference to the accompanying drawings and specific examples. It will be understood that when an element is referred to as being "secured to" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may be present. As used in this specification, the terms "upper," "lower," "inner," "outer," "bottom," and the like are used in the orientation or positional relationship indicated in the drawings for convenience in describing the invention and simplicity in description, and do not indicate or imply that the referenced device or element must have a particular orientation, be constructed and operated in a particular orientation, and are not to be considered limiting of the invention. Furthermore, the terms "first," "second," "third," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.
Furthermore, the technical features mentioned in the different embodiments of the invention described below can be combined with each other as long as they do not conflict with each other.
The vehicle-mounted millimeter wave radar comprises a microstrip antenna or a millimeter wave microstrip circuit, and the millimeter wave matching load is a common device used in the design and test of the microstrip antenna or the millimeter wave microstrip circuit. At present, the vehicle-mounted millimeter wave radar works at 76-81GHz, and the sizes of an antenna and a circuit are small, so that the millimeter wave matching load is required to realize miniaturization and integration.
Because the traditional matched load is generally a waveguide matched load, the matching performance of the traditional matched load is superior, but the waveguide matched load is large in size and weight, difficult to integrate, incapable of realizing miniaturization and integration, limited by the manufacturing process, very high in cost and incapable of meeting the requirements of millimeter wave vehicle-mounted radars.
In view of the above, the invention provides a millimeter wave matching load based on a grounded coplanar waveguide transmission line and a vehicle-mounted millimeter wave radar, and the millimeter wave matching load is formed by the grounded coplanar waveguide transmission line and a wave-absorbing module, so that the millimeter wave matching load has a simple structure and a small size, can realize miniaturization and integration, is easy to integrate with a microstrip antenna or a millimeter wave microstrip circuit, has low manufacturing cost, has low reflectivity when the millimeter wave matching load works at 76-81GHz, is less than-36 dB in reflectivity, and is very suitable for the vehicle-mounted millimeter wave radar with the working frequency of 76-81 GHz.
For the purpose of promoting an understanding of the principles of the invention, reference will now be made in detail to the embodiments illustrated in the drawings.
In one embodiment, as shown in fig. 1 and 2, the present invention provides a millimeter wave matching load based on a grounded coplanar waveguide transmission line, the millimeter wave matching load 1 comprising: the wave absorbing device comprises a lower metal ground 11, a dielectric substrate 12, a grounded coplanar waveguide transmission line 13 and a wave absorbing module 14; wherein:
the dielectric substrate 12 is arranged on the lower metal ground 11;
the grounded coplanar waveguide transmission line 13 is arranged above the dielectric substrate 12, and is used for transmitting energy to the wave-absorbing module 14 and interacting with the wave-absorbing module 14 to perform impedance matching; the grounded coplanar waveguide transmission line 13 comprises a plurality of metalized via holes 134 and a coplanar metal ground 135, wherein the metalized via holes 134 penetrate through the coplanar metal ground 135, the dielectric substrate 12 and the lower metal ground 11, so that the metalized via holes 134 are electrically connected with the coplanar metal ground 135 and the lower metal ground 11;
the wave absorbing module 14 is fixedly installed on the coplanar metal ground 135, so that the wave absorbing module 14 is in contact with the grounded coplanar waveguide transmission line 13 to absorb the energy transmitted from the grounded coplanar waveguide transmission line 13.
In this embodiment, a millimeter wave matching load based on a grounded coplanar waveguide transmission line is provided, which includes a lower metal ground, a dielectric substrate, a grounded coplanar waveguide transmission line, and a wave-absorbing module; the dielectric substrate is arranged on the lower metal ground; the grounding coplanar waveguide transmission line is arranged above the dielectric substrate and comprises a plurality of metalized through holes and a coplanar metal ground, and the metalized through holes penetrate through the coplanar metal ground, the dielectric substrate and the lower layer metal ground so as to electrically connect the metalized through holes with the coplanar metal ground and the lower layer metal ground; the wave absorbing module is fixedly arranged on the coplanar metal ground, is in contact with the grounded coplanar waveguide transmission line, absorbs energy transmitted from the grounded coplanar waveguide transmission line, and interacts with the grounded coplanar waveguide transmission line to perform impedance matching. Therefore, the grounded coplanar waveguide transmission line and the wave-absorbing module form a millimeter wave matching load, the structure is simple, the size is small, the miniaturization and the integration can be realized, the millimeter wave matching load is easy to integrate with a microstrip antenna or a millimeter wave microstrip circuit, the manufacturing cost is low, the millimeter wave matching load has low reflectivity when working at 76-81GHz, the reflectivity is less than-36 dB, and the millimeter wave matching load is very suitable for a vehicle-mounted millimeter wave radar with the working frequency of 76-81 GHz.
In one embodiment, the dielectric substrate 12 is disposed on the lower metal ground 11, and in particular, the dielectric substrate 12 completely covers the lower metal ground 11.
In one embodiment, the grounded coplanar waveguide transmission line 13 is disposed above the dielectric substrate 12.
Specifically, the grounded coplanar waveguide transmission line 13 is formed by deposition above the dielectric substrate 12, and is a special energy transmission system, which can be seen as an evolution from a two-conductor transmission line, that is, an infinitely thin conductor plate is vertically inserted into the middle of a two-conductor, because the conductor plate is perpendicular to all power lines, the field distribution of the original industry is not affected, and the grounded coplanar waveguide transmission line is formed by transforming a conductor cylinder into a conductor strip and adding a dielectric material between the conductor strips.
The shape and width of the conduction band of the grounded coplanar waveguide transmission line 13 are determined according to the design, and the specific adopted process is as follows: the first is making plate by photo, photoetching and corroding, making the micro-strip blank plate into a circuit; the other is formed by evaporating specific patterns of determined conduction band shapes and widths onto a substrate by adopting a vacuum coating technology.
Preferably, the length and width of the grounded coplanar waveguide transmission line 13 are equal to those of the dielectric substrate 12.
In one embodiment, as shown in fig. 2 and 3, the grounded coplanar waveguide transmission line 13 further includes an input port 131, a transmission section 132, a tuning section 133; wherein, one end of the transmission section 132 is connected to the input port 131, and the other end is connected to the tuning section 133; the tuning section 133 is located entirely below the wave-absorbing module 14.
The coplanar metal ground 135 extends inward from one side to form a through opening 1351;
the wave-absorbing module 14 is fixedly installed on the coplanar metal ground 135, and specifically, the installation position of the wave-absorbing module 14 is located above the through opening 1351 of the coplanar metal ground 135.
The transmission section 132 and the tuning section 133 constitute a grounded coplanar waveguide signal line having a shape matching the shape of the through opening 151 of the coplanar metal ground 15, and a gap 2 for signal transmission is provided between the grounded coplanar waveguide signal line and the through opening 1351 of the coplanar metal ground 135, the gap 2 having a width g 1.
The width wS of the tuning section 133 is greater than the width of the transmission section 132, and the width of the gap 2 at the connection point of the tuning section 133 and the transmission section 132 is g 2.
A number of the metallized vias 134 are distributed around the outside of the through opening 1351 of the coplanar metal ground 135.
The input port 131 is used for providing an input interface for receiving external energy and inputting the energy into the transmission section 132 connected thereto.
The transmission line 132 is used to transmit the input energy to the tuning section 133. Preferably, the transmission section 132 may be entirely outside the wave-absorbing module 14 and does not extend below the wave-absorbing module 14, or a part of the transmission section 132 extends below the wave-absorbing module 14 by an extension length il as shown in fig. 3.
The tuning section 133 is configured to transmit the input energy to the wave absorbing module 14 in contact therewith for impedance matching.
Preferably, the shape of the tuning section 133 may include: rectangular, fan-shaped, oval, and the like. Accordingly, the shape of the through opening 151 of the coplanar metal ground 15 matches the shape of the tuning section 133.
In the present embodiment, the shape of the tuning section 133 is illustrated by taking a rectangle as an example, and the length lS and the width wS of the tuning section 133 may affect the impedance matching effect.
In this embodiment, the tuning section 133 is located below the wave-absorbing module 14, so as to transmit the input energy to the wave-absorbing module 14 in contact with the tuning section for impedance matching. After the wave-absorbing module 14 gradually absorbs the energy input by the tuning section 133, the purpose of impedance matching is achieved by influencing the characteristic impedance of the grounded coplanar waveguide transmission line 13.
In one embodiment, the wave absorbing module 14 performs impedance matching according to gradual absorption of energy transmitted from the grounded coplanar waveguide transmission line 13.
Specifically, after the wave absorbing module 14 gradually absorbs the energy input by the tuning section 133, the characteristic impedance of the grounded coplanar waveguide transmission line 13 is affected, so as to achieve the purpose of impedance matching.
The size and shape of the wave-absorbing module 14 can be adjusted accordingly according to actual conditions, and the wave-absorbing effect is only affected within a certain range, but the characteristic impedance of the grounded coplanar waveguide transmission line 13 can still be affected, so as to achieve the purpose of impedance matching.
Preferably, the wave absorbing module 14 is an injection-molded wave absorbing plate. The wave-absorbing module 14 can also be replaced by other wave-absorbing materials.
Specifically, taking the wave-absorbing module 14 as an injection wave-absorbing plate as an example, the technical scheme of the millimeter wave matching load based on the grounded coplanar waveguide transmission line provided by the invention is further described in detail.
In this embodiment, the dielectric substrate 12 is Rogers Ro3003G2, the thickness of the dielectric substrate 12 is 0.127mm, and the copper-clad thickness is 0.5 oz; the size of the grounding coplanar waveguide signal line is lL-0.4 mm, lS-1.3 mm, wS-0.7 mm, the width of the 50 ohm transmission line is 0.3mm, g 1-0.15 mm, and g 2-0.3 mm; the injection-molded wave-absorbing sheet material is DX04490R of SABIC, the size is wA which is 3mm, lA which is 3mm, and tA which is 2 mm.
Fig. 4 is a schematic diagram illustrating the effect of impedance matching of the millimeter wave matching load based on the grounded coplanar waveguide transmission line, which operates at 76-81GHz according to the above embodiment of the present invention.
As can be seen from FIG. 4, the millimeter wave matching load has low reflectivity when working at 76-81GHz, the reflectivity is less than-36 dB, the millimeter wave matching load is easy to integrate with a microstrip antenna or a millimeter wave microstrip circuit, and the millimeter wave matching load is very suitable for a vehicle-mounted millimeter wave radar with the working frequency of 76-81 GHz.
As shown in fig. 5 to 7, the effect of different lengths lA, different widths wA, and different thicknesses tA of the wave-absorbing module on impedance matching are respectively shown in schematic diagrams.
As can be seen from fig. 5 to 7, the wave-absorbing module affects the wave-absorbing effect in a certain range at different lengths lA, different widths wA and different thicknesses tA, has a certain effect on impedance matching, can affect the characteristic impedance of the grounded coplanar waveguide transmission line 13, but still can achieve the purpose of impedance matching, and has low reflectivity at 76-81GHz, and the reflectivity is less than-36 dB.
As shown in fig. 5, when the width wA and the thickness tA of the wave-absorbing module are not changed, the optimal impedance matching effect can be obtained when the length lA of the wave-absorbing module is 3 mm.
As shown in fig. 6, when the length lA and the thickness tA of the wave-absorbing module are not changed, the optimal impedance matching effect can be obtained when the width wA of the wave-absorbing module is 3 mm.
As shown in fig. 7, when the length lA and the width wA of the wave-absorbing module are not changed, an optimal impedance matching effect can be obtained when the thickness tA of the wave-absorbing module is 2 mm.
In one embodiment, as shown in fig. 2 and 3, the wave-absorbing module 14 is fixedly mounted on the coplanar metal ground 135, specifically: the wave-absorbing module 14 can be fixed on the coplanar metal ground 135 by gluing or mounting a clamp. Preferably, the wave absorbing module 14 is fixedly mounted in the center of the coplanar metal ground 135.
Based on the same concept, in one embodiment, as shown in fig. 8, the present invention provides a millimeter wave radar, which includes a microstrip antenna or a millimeter wave microstrip circuit, where the microstrip antenna or the millimeter wave microstrip circuit includes the millimeter wave matching load 1 described in any of the above embodiments.
In this embodiment, the millimeter wave matching load 1 is the same as the millimeter wave matching load 1 described in any embodiment, and the specific structure and function may refer to the millimeter wave matching load 1 described in any embodiment, which is not described herein again.
In this embodiment, the millimeter wave radar includes a microstrip antenna or a millimeter wave microstrip circuit, the microstrip antenna or the millimeter wave microstrip circuit includes a millimeter wave matched load, and the millimeter wave matched load includes a lower metal ground, a dielectric substrate, a grounded coplanar waveguide transmission line, and a wave-absorbing module; the dielectric substrate is arranged on the lower metal ground; the grounding coplanar waveguide transmission line is arranged above the dielectric substrate and comprises a plurality of metalized through holes and a coplanar metal ground, and the metalized through holes penetrate through the coplanar metal ground, the dielectric substrate and the lower layer metal ground so as to electrically connect the metalized through holes with the coplanar metal ground and the lower layer metal ground; the wave absorbing module is fixedly arranged on the coplanar metal ground, is in contact with the grounded coplanar waveguide transmission line, absorbs energy transmitted from the grounded coplanar waveguide transmission line, and interacts with the grounded coplanar waveguide transmission line to perform impedance matching. Therefore, the grounded coplanar waveguide transmission line and the wave-absorbing module form a millimeter wave matching load, the structure is simple, the size is small, the miniaturization and the integration can be realized, the millimeter wave matching load is easy to integrate with a microstrip antenna or a millimeter wave microstrip circuit, the manufacturing cost is low, the millimeter wave matching load has low reflectivity when working at 76-81GHz, the reflectivity is less than-36 dB, and the millimeter wave matching load is very suitable for a vehicle-mounted millimeter wave radar with the working frequency of 76-81 GHz.
It should be noted that the millimeter wave radar embodiment and the millimeter wave matching load embodiment belong to the same concept, and the specific implementation process is described in the millimeter wave matching load embodiment, and the technical features in the millimeter wave matching load embodiment are all applicable in the millimeter wave radar embodiment, which is not described herein again.
It should be noted that, in this document, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element.
Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; within the idea of the invention, also technical features in the above embodiments or in different embodiments may be combined, steps may be implemented in any order, and there are many other variations of the different aspects of the invention as described above, which are not provided in detail for the sake of brevity; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.
Claims (10)
1. A millimeter wave matched load based on a grounded coplanar waveguide transmission line, the millimeter wave matched load comprising: the lower metal ground, the dielectric substrate, the grounded coplanar waveguide transmission line and the wave-absorbing module; wherein:
the dielectric substrate is arranged on the lower metal ground;
the grounded coplanar waveguide transmission line is arranged above the medium substrate and used for transmitting energy to the wave absorbing module and interacting with the wave absorbing module to perform impedance matching; the grounding coplanar waveguide transmission line comprises a plurality of metalized through holes and a coplanar metal ground, wherein the metalized through holes penetrate through the coplanar metal ground, the dielectric substrate and the lower layer metal ground, so that the metalized through holes are electrically connected with the coplanar metal ground and the lower layer metal ground;
the wave absorbing module is fixedly arranged on the coplanar metal ground, so that the wave absorbing module is in contact with the grounded coplanar waveguide transmission line and absorbs energy transmitted from the grounded coplanar waveguide transmission line.
2. The millimeter-wave matched load of claim 1, wherein the coplanar metallic ground extends inwardly from one side to form a through opening; the wave absorbing module is installed above the through opening of the coplanar metal ground.
3. The millimeter-wave matched load of claim 2, wherein the grounded coplanar waveguide transmission line further comprises an input port, a transmission section, and a tuning section; one end of the transmission section is connected with the input port, and the other end of the transmission section is connected with the tuning section; the tuning section is completely positioned below the wave absorbing module; wherein:
the input port is used for providing an input interface for receiving external energy and inputting the energy into the transmission section connected with the input port;
the transmission line is used for transmitting input energy to the tuning section;
and the tuning section is used for transmitting the input energy to the wave-absorbing module which is in contact with the tuning section for impedance matching.
4. The millimeter wave matched load of claim 3, wherein the transmission section and the tuning section constitute a grounded coplanar waveguide signal line, the shape of which matches the shape of the through opening of the coplanar metal ground, and a gap for signal transmission is provided between the grounded coplanar waveguide signal line and the through opening of the coplanar metal ground;
and a plurality of metalized through holes are distributed around the outer side of the through opening of the coplanar metal ground.
5. The millimeter wave matched load of claim 3, wherein the transmission section is entirely outside the wave absorbing module and does not extend below the wave absorbing module; or one part of the transmission section extends into the lower part of the wave absorbing module.
6. The millimeter-wave matched load of claim 3, wherein the shape of the tuning section comprises one of: rectangular, fan-shaped, oval.
7. The millimeter wave matched load according to claim 1, wherein the wave absorbing module is fixedly mounted on the coplanar metal ground, and specifically comprises: the wave-absorbing module is fixed on the coplanar metal ground through glue.
8. The millimeter wave matched load according to claim 1, wherein the wave absorbing module is fixedly mounted on the coplanar metal ground, and specifically comprises: the wave absorbing module is fixed on the coplanar metal ground through a mounting fixture.
9. The millimeter wave matched load of claim 1, wherein the wave absorbing module is fixedly mounted in the center of the coplanar metal ground.
10. A millimeter-wave radar comprising a microstrip antenna or a millimeter-wave microstrip circuit comprising a millimeter-wave matched load according to any one of claims 1 to 9.
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