CN114284672A - Waveguide conversion device, circuit module, and electromagnetic wave conversion method - Google Patents
Waveguide conversion device, circuit module, and electromagnetic wave conversion method Download PDFInfo
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- CN114284672A CN114284672A CN202111497643.8A CN202111497643A CN114284672A CN 114284672 A CN114284672 A CN 114284672A CN 202111497643 A CN202111497643 A CN 202111497643A CN 114284672 A CN114284672 A CN 114284672A
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Abstract
The application provides a waveguide conversion device, a circuit module and an electromagnetic wave conversion method, wherein the waveguide conversion device comprises a waveguide, a dielectric substrate, a waveguide conversion structure and a differential transmission line, wherein the waveguide is provided with a waveguide port perpendicular to the dielectric substrate; the metal layer of the dielectric substrate is provided with a first windowing and a transmission channel which are communicated, the peripheral sides of the first windowing and the transmission channel are provided with metal grounds, and the first windowing is arranged corresponding to the waveguide port and communicated with the waveguide port; the waveguide conversion structure is arranged in the first window; the differential transmission line is disposed within the transmission channel and connected to the waveguide transition structure. The waveguide conversion device is simple in structure, can be conveniently connected with a waveguide through a waveguide port, and can realize the electromagnetic wave transmission between the waveguide port and the differential transmission line through the waveguide conversion structure arranged in the first window.
Description
Technical Field
The present disclosure relates to the field of electromagnetic wave transmission technologies, and in particular, to a waveguide conversion device, a circuit module, and an electromagnetic wave conversion method.
Background
With the development of microstrip millimeter wave technology, in communication, radar, guidance and other fields, differential transmission lines are increasingly used, for example, antennas in the form of differential feeding are used, and interfaces of many chips are in the form of differential, and accordingly, the differential transmission lines are required to be used for electrical connection.
Meanwhile, in microwave circuits and systems, it is often necessary to transmit a microwave signal between a waveguide and a transmission line. In order to match the waveguide with the differential transmission line, a waveguide conversion device and a circuit module are required to be designed to realize propagation conversion between the waveguide and the differential transmission line.
Disclosure of Invention
The application provides a waveguide conversion device, a circuit module and an electromagnetic wave conversion method, which are used for realizing the propagation of electromagnetic waves between a waveguide and a differential transmission line.
A first aspect of the present application provides a waveguide conversion apparatus, including a waveguide, a dielectric substrate, a waveguide conversion structure, and a differential transmission line, wherein the waveguide has a waveguide port penetrating through the waveguide in a thickness direction; the dielectric substrate is arranged perpendicular to the waveguide port and is provided with a metal layer, the metal layer is provided with a first windowing and a transmission channel which are communicated, metal ground is arranged on the peripheral sides of the first windowing and the transmission channel, and the first windowing is arranged corresponding to the waveguide port and is communicated with the waveguide port; the waveguide conversion structure is arranged in the first window; the differential transmission line is arranged in the transmission channel and connected to the waveguide conversion structure; the waveguide conversion structure is used for realizing the propagation of electromagnetic waves between the waveguide port and the differential transmission line.
In some embodiments, the shape and position of the first fenestration matches the projection of the waveguide port on the dielectric substrate.
In some embodiments, the waveguide transition structure includes a matching member and an impedance transformation member connected, wherein the matching member is disposed opposite to the waveguide port and has an impedance width, and the impedance transformation member is connected to the differential transmission line.
In some embodiments, the waveguide port, the first window and the matching member are rectangular, the matching member has opposite wide sides and opposite narrow sides, the opposite wide sides are symmetrically formed with concave structures concave toward the middle, and the impedance width is formed between the two concave structures.
In some embodiments, the recessed feature is arcuate, triangular, or stepped.
In some embodiments, the metal ground is comprised of metalized vias disposed at intervals.
In some embodiments, the metalized vias disposed outside of the two broadsides have a one-to-one correspondence and satisfy:
wherein, WeffThe metal via holes are arranged on the outer sides of the two wide sides in a one-to-one correspondence mode, W is the length of the narrow sides, D is the hole diameter of the metal via holes, and S is the center distance between two adjacent metal via holes arranged at intervals.
In some embodiments, the arrangement of the metalized vias satisfies:
in some embodiments, the wavelength of the electromagnetic wave input to the waveguide conversion device is λ; a second window communicated with the waveguide is arranged on the waveguide corresponding to the transmission channel, a second window communicated with the waveguide corresponding to the transmission channel is arranged on the waveguide, the length of the second window in the thickness direction of the waveguide is H, and H satisfies the following conditions:
in some embodiments of the present invention, the,
in some embodiments, the second window has a first sub-section and a second sub-section connected in sequence, the first sub-section is close to the transmission channel and has a length H in a thickness direction of the waveguide, and the second sub-section has a length λ in the thickness direction of the waveguide.
In some embodiments, the waveguide and the dielectric substrate are provided with mounting holes, respectively.
In some embodiments, the waveguide and the dielectric substrate are further provided with positioning holes correspondingly.
Correspondingly, the second aspect of the present application also provides a circuit module, which includes at least one waveguide conversion device as described above and a printed circuit board, where the dielectric substrate of the waveguide conversion device is a part of the printed circuit board.
In some embodiments, the number of waveguide conversion devices is at least two, and at least two waveguide conversion devices are arranged side by side.
Accordingly, the third aspect of the present application also provides an electromagnetic wave conversion method, including the steps of: s110, providing the waveguide conversion device; and S120, inputting electromagnetic waves to the waveguide conversion device, wherein the waveguide conversion device enables the input electromagnetic waves to propagate between the waveguide and the differential transmission line.
The application has the following beneficial effects: in the waveguide conversion device, the circuit module, and the electromagnetic wave conversion method provided by the application, the waveguide conversion device has a simple structure, and the waveguide conversion structure arranged in the first window can realize the electromagnetic wave transmission between the waveguide port and the differential transmission line. For example, after coupling the E-plane of a waveguide to the waveguide port, the electromagnetic wave can propagate between the waveguide port and the differential transmission line through the waveguide conversion device, and the differential transmission line can be used for connecting to other structures with differential interfaces, so as to more conveniently exert the advantages of better common mode noise suppression, high linearity, high dynamic range and the like of the differential transmission line.
Meanwhile, because the waveguide conversion device has a simple integral structure, when a plurality of waveguide conversion devices are arranged in the circuit module side by side, the distance between the outlet ends of two adjacent transmission channels is small, so that the distance between two adjacent differential transmission lines is correspondingly small, which is beneficial to improving the integration level of the differential transmission lines and is convenient for practical application, such as the connection design of an antenna array.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
Fig. 1 schematically shows a structure of a waveguide conversion device according to the present application.
Fig. 2 schematically shows a top view of a dielectric substrate in the present application.
Fig. 3 schematically shows a structure of a medium substrate layer in the present application.
Fig. 4 exemplarily shows a partially enlarged view a of fig. 2.
Fig. 5 is a schematic view illustrating a structure of the mating member of the present application.
Fig. 6 is a schematic view illustrating still another structure of the mating member of the present application.
Fig. 7 is a schematic view illustrating still another structure of the mating member of the present application.
Fig. 8 schematically shows a half-section of a waveguide conversion device in the present application.
Fig. 9 schematically shows a flow chart of the electromagnetic wave conversion method in the present application.
The main reference numbers in the figures illustrate:
Waveguide port 111 and second window 112
Metallized via 1231 first metal layer 1201
Matching piece 131 of waveguide conversion structure 130
Impedance transformer 132 differential transmission line 140
Detailed Description
The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application. Furthermore, it should be understood that the detailed description and specific examples, while indicating exemplary embodiments of the invention, are given by way of illustration and explanation only, and are not intended to limit the scope of the invention. In the present application, unless otherwise specified, the use of directional terms such as "upper", "lower", "left" and "right" generally refer to upper, lower, left and right in the actual use or operation of the device, and specifically to the orientation of the drawing figures.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature.
The present application provides a waveguide conversion device, a circuit module, and an electromagnetic wave conversion method, which will be described in detail below. It should be noted that the following description of the embodiments is not intended to limit the preferred order of the embodiments of the present application. In the following embodiments, the descriptions of the respective embodiments have respective emphasis, and reference may be made to related descriptions of other embodiments for parts that are not described in detail in a certain embodiment.
Referring to fig. 1 to 2, an embodiment of the present application provides a waveguide transformation device 100 for implementing propagation of electromagnetic waves between a waveguide and a differential transmission line 140, which includes a waveguide 110, a dielectric substrate 120, a waveguide transformation structure 130, and a differential transmission line 140.
The waveguide 110 has a waveguide opening 111 penetrating through the waveguide 110 in the thickness direction, the dielectric substrate 120 is disposed perpendicular to the waveguide opening 111 and has a metal layer, the metal layer has a first window 121 and a transmission channel 122 communicated with each other, the metal ground 123 is disposed on the peripheral sides of the first window 121 and the transmission channel 122, the first window 121 is disposed corresponding to the waveguide opening 111 and is communicated with the waveguide opening 111, the waveguide transition structure 130 is disposed in the first window 121, and the differential transmission line 140 is disposed in the transmission channel 122 and connected to the waveguide transition structure 130.
Here, the waveguide conversion structure 130 is used to realize propagation of electromagnetic waves between the waveguide port 111 and the differential transmission line 140. Illustratively, when the waveguide port 111 is used as an input electromagnetic wave, the waveguide transition structure 130 is used to propagate the electromagnetic wave to the differential transmission line 140 and output the electromagnetic wave by the differential transmission line 140. As another example, when the differential transmission line 140 is used as an input electromagnetic wave, the waveguide transition structure 130 is used to propagate the electromagnetic wave to the waveguide 110 and output the electromagnetic wave from the waveguide 110.
It can be seen that the waveguide conversion apparatus 100 provided in the embodiment of the present application has a simple structure, the waveguide 110 can be conveniently connected to the waveguide port 111, and the waveguide conversion structure 130 disposed in the first window 121 can realize the propagation of the electromagnetic wave between the waveguide port 111 and the differential transmission line 140. That is, the input electromagnetic wave can propagate between the waveguide port 111 and the differential transmission line 140 through the waveguide conversion apparatus 100, and the differential transmission line 140 can be used to connect to other structures with a differential interface, so as to more conveniently exert the advantages of better common mode noise suppression, high linearity and high dynamic range of the differential transmission line 140.
Meanwhile, because the waveguide conversion device 100 has a simple overall structure, when a plurality of waveguide conversion devices 100 are arranged side by side for use, the distance between the outlet ends of two adjacent transmission channels 122 is small, so that the distance between two adjacent differential transmission lines 140 is correspondingly small, which is beneficial to improving the integration level of the differential transmission lines 140 and is convenient for practical application, for example, for facilitating the connection design of an antenna array.
Hereinafter, the main part of the waveguide conversion device 100 will be described with reference to the drawings.
Referring to fig. 1, the waveguide 110 has a waveguide port 111 penetrating through the thickness direction thereof, and the waveguide port 111 is used for propagating electromagnetic waves.
Illustratively, since the rectangular waveguide has the characteristics of large power capacity, small loss, no radiation loss, simple structure, high quality factor, and the like, many microwave millimeter wave band devices use a standard rectangular waveguide as input or output, and thus the waveguide 110 may be a standard rectangular waveguide. Here, the waveguide port 111 is correspondingly provided in a rectangular shape. It is understood that in other embodiments, the waveguide 110 may have other forms of waveguides, and accordingly, the waveguide port 111 may have other shapes, such as a circular shape, an oval shape, or the like.
Referring to fig. 2, the dielectric substrate 120 is vertically connected to one end of the waveguide 110 in the thickness direction, and covers one end of the waveguide port 111 close to the dielectric substrate 120. Here, the dielectric substrate 120 is a multi-layer structure, and for example, as shown in fig. 3, the dielectric substrate 120 is a three-layer structure including a first metal layer 1201, a substrate layer 1202, and a second metal layer 1203, which are sequentially disposed from top to bottom. The first metal layer 1201 is provided with the first window 121, the transmission channel 122, and the metal ground 123. It is understood that in other embodiments, the dielectric substrate 120 may have other numbers of layers, which is not limited in this embodiment.
In some embodiments, the waveguide 110 and the dielectric substrate 120 are correspondingly provided with mounting holes 150, and the mounting holes 150 are used for connecting the waveguide 110 to the dielectric substrate 120 and the waveguide through fasteners (for example, screws). Illustratively, referring to fig. 1 and 2, three mounting holes 150 are correspondingly formed on the waveguide 110 and the dielectric substrate 120, and the waveguide 110 and the dielectric substrate 120 can be connected by the fastening member.
It is understood that, in other embodiments, the connection between the waveguide 110 and the dielectric substrate 120 is not limited to the above connection, and other methods such as bolting, welding, clamping, etc. may be adopted, which is not limited by this embodiment.
In some embodiments, on the basis of the installation hole 150, positioning holes 160 are correspondingly formed on the waveguide 110 and the dielectric substrate 120, and the positioning holes 160 are used for positioning the waveguide 110 and the dielectric substrate 120 and the waveguide by positioning members (for example, positioning pins) to ensure assembly accuracy among the waveguide, the waveguide 110 and the dielectric substrate 120. For example, referring to fig. 1 and fig. 2, four positioning holes 160 are correspondingly circumferentially disposed on the waveguide 110 and the dielectric substrate 120, and the positioning between the waveguide 110 and the dielectric substrate 120 can be realized by the positioning element.
As described above, referring to fig. 2 to 3, for the first window 121 disposed on the dielectric substrate 120, the first window 121 is disposed corresponding to the waveguide opening 111, that is, the shape and the position of the first window 121 match the projection of the waveguide opening 111 on the dielectric substrate 120. In other words, the first window 121 is substantially the same as the projection shape and the position of the waveguide port 111 on the dielectric substrate 120. Illustratively, the projection of the waveguide opening 111 on the dielectric substrate 120 covers the first opening window 121, for example, the first opening window 121 is slightly smaller than the projection of the waveguide opening 111 on the dielectric substrate 120.
The transmission channel 122 has two opposite ends, one end of which is connected to the first window 121 and the other end of which is used as an outlet end of the differential transmission line 140, and exemplarily, the transmission channel 122 may be disposed substantially perpendicular to the waveguide port 111.
Meanwhile, a metal ground 123 is further disposed on the first window 121 and the peripheral side of the transmission channel 122, and the metal ground 123 contributes to energy concentration so as to better realize transmission of electromagnetic waves.
In some embodiments, the metal ground 123 may be formed by metalized vias 1231 disposed at intervals.
For example, referring to fig. 4, the waveguide conversion structure 130 includes a matching member 131, and details of the matching member 131 will be described later. Here, in order to make the dielectric waveguide cavity between the matching member 131 and the metal ground 123 have a desired resonance frequency, the metalized vias 1231 disposed outside two wide sides of the rectangular matching member 131 have a one-to-one correspondence and satisfy:
wherein, WeffThe center distances between the metalized vias 1231 on the outer sides of the two wide sides, that is, the center distances between the metalized vias 1231 on the upper and lower sides of the first window 121 in fig. 3, W is the length of the narrow side, D is the hole diameter of the metalized via 1231, and S is the center distance between the metalized vias 1231 disposed at two adjacent intervals.
In a further embodiment, with continued reference to fig. 4, in order to prevent the electromagnetic wave energy in the first window 121 from leaking too much to reduce the energy loss rate, the arrangement of the metalized vias 1231 on the upper and lower sides and the right side of the first window 121 in fig. 3 and the arrangement of the metalized vias 1231 on the upper and lower sides of the transmission channel 122 in fig. 3 are satisfied:
here, the arrangement of the metalized via 1231 can ensure that the dielectric waveguide cavity between the matching member 131 and the metal ground 123 can have a desired resonant frequency, and at the same time, the electromagnetic wave energy in the first window 121 does not leak too much, so that the waveguide transition structure 130 has a better electromagnetic wave propagation capability, and the input electromagnetic wave can be effectively propagated between the waveguide 110 and the differential transmission line 140 with low loss.
As described above, the waveguide transition structure 130 is used to realize propagation of electromagnetic waves between the waveguide port 111 and the differential transmission line 140, and is specifically disposed in the first window 121.
Referring to fig. 2 and 4, the waveguide transformation structure 130 includes a matching element 131 and an impedance transformation element 132 connected to each other and connected to the first window 121 of the dielectric substrate 120, wherein the matching element 131 is disposed opposite to the waveguide opening 111 and has an impedance width, the impedance width is set corresponding to a desired impedance value, and the impedance transformation element 132 is connected to the differential transmission line 140.
In some embodiments, the waveguide opening 111, the first window 121 and the matching member 131 are rectangular, where the rectangular matching member 131 has opposite wide sides and opposite narrow sides, wherein the resonant frequency of the matching member 131 can be adjusted by changing the length of the wide sides. As shown in fig. 5 to 7, concave structures that are concave toward the middle are symmetrically formed on the opposite wide sides, and the impedance width is formed between the two concave structures. The impedance width, i.e. the distance between the two broad sides, can be varied by adjusting the dimensions of the recess structure to match the impedance of the waveguide. Specifically, by adjusting the size of the recess structure, the width of the gap between the matching member 131 and the surrounding ground area can be changed, thereby changing the capacitance, modifying the equivalent resonant circuit, and increasing the operating bandwidth of the matching member 131. Illustratively, the size of the recessed structure can be obtained by simulation with HFSS simulation software.
Illustratively, as shown in fig. 5, the two concave structures are symmetrically arranged in an arc shape, and the wide side is an arc of the arc-shaped concave structure, where the wide side presents a continuously changing arc shape, so that the matching member 131 has a continuously changing impedance value, i.e., the impedance change of the matching member 131 is continuous, and the working bandwidth of the matching member 131 is relatively effectively improved. For another example, please refer to fig. 6, the two concave structures are symmetrically arranged in a triangle, the wide side includes two straight sides, and the lengths of the two straight sides are equal to form the concave structure in the shape of an isosceles triangle. Still exemplarily, referring to fig. 7, two of the concave structures are symmetrically arranged in a step shape, and the wide side includes a plurality of step edges.
The impedance transformation element 132 is used for connecting the matching element 131 and the differential transmission line 140, and implementing impedance transformation between the matching element 131 and the differential transmission line 140.
Illustratively, the impedance transformer 132 may be a quarter-impedance transformer. It is understood that, in other embodiments, the impedance transformation element 132 may also be used to implement three-quarter impedance transformation, five-eighth impedance transformation, or the like, and the present embodiment is not limited thereto.
In some embodiments, referring to fig. 1 and 8, a second window 112 is disposed on the waveguide 110 corresponding to the transmission channel 122 and is communicated with the transmission channel, and the second window 112 is used to prevent a metal wall of the waveguide 110 from contacting the differential transmission line 140 to cause a short circuit. It is to be understood that, in fig. 8, the waveguide conversion structure 130 and the differential transmission line 140 are not shown for the convenience of viewing.
Here, in order to reduce energy leakage in the waveguide conversion apparatus 100, the length of the second window 112 in the thickness direction of the waveguide 110 is H, and H satisfies:
where λ is the wavelength of the electromagnetic wave input to the waveguide conversion device 100.
Illustratively, H is
Also illustratively, H is
Further exemplary, H is
The data of H taken above is only a part of the data, and not all the data of H. In other embodiments, H may take on other values.
In a further embodiment, please refer to fig. 8, on the basis of providing the second window 112, the second window 112 has a first sub-segment 1121 and a second sub-segment 1122 connected in sequence, where the first sub-segment 1121 is close to the transmission channel 122 and has a length H in the thickness direction of the waveguide 110, and the second sub-segment 1122 has a length λ in the thickness direction of the waveguide 110. Here, the height of the second sub-segment 1122 is adapted to the wavelength of the input electromagnetic wave, so that the loss of the electromagnetic wave in the waveguide conversion device 100 can be smaller.
Here, by the specific structural arrangement of the second window 112, while preventing contact with the differential transmission line 140 to cause a short circuit, good electromagnetic wave propagation efficiency is achieved, and propagation loss of electromagnetic waves in the waveguide conversion device 100 is reduced.
In order to better apply the waveguide conversion device 100, embodiments of the present application also provide a circuit module including at least one of the aforementioned waveguide conversion devices 100 and a printed circuit board.
The dielectric substrate 120 of the waveguide conversion apparatus 100 is a part of the printed circuit board, that is, the printed circuit board has the dielectric substrate 120.
Here, when a plurality of waveguide conversion devices 100 are arranged side by side in the circuit module, the interval between the transmission channels 122 is substantially limited only by the size of the dielectric substrate 120, and when a plurality of waveguide conversion devices 100 are adjacently arranged, the interval between the transmission channels 122 is small, so that the outlet ends of the transmission channels 122 are arranged closer to each other, and thus higher integration of the outlet ends can be achieved.
It is understood that the terms in the circuit module of the present embodiment have the same meanings as those in the waveguide conversion device 100, and specific implementation details may refer to descriptions in the embodiment of the waveguide conversion device 100, and the exemplary descriptions and technical effects shown in the foregoing embodiments can be implemented correspondingly for the circuit module, which is not described again in this embodiment.
In order to facilitate the application of the waveguide conversion apparatus 100, correspondingly, referring to fig. 9, an embodiment of the present application further provides an electromagnetic wave conversion method for implementing propagation conversion of an electromagnetic wave between a waveguide and a differential transmission line, which includes the following steps S110 to S130.
In step S110, a waveguide conversion device 100 is provided, the waveguide conversion device 100 includes a waveguide 110, a dielectric substrate 120, a waveguide conversion structure 130 and a differential transmission line 140, the waveguide 110 has a waveguide opening 111, the dielectric substrate 120 has a metal layer, the metal layer has a first window 121 and a transmission channel 122 communicated with each other, the metal ground 123 is disposed on the peripheral side of the first window 121 and the transmission channel 122, the first window 121 is disposed corresponding to and communicated with the waveguide opening 111, the waveguide conversion structure 130 is disposed in the first window 121, and the differential transmission line 140 is disposed in the transmission channel 122 and connected to the waveguide conversion structure 130.
In step S120, an electromagnetic wave is input to the waveguide conversion device 130, and the waveguide conversion device 130 causes the electromagnetic wave to propagate between the waveguide 110 and the differential transmission line 140.
In some embodiments, the step S120 includes a step S121, in which an electromagnetic wave is input through the waveguide port 111, and the waveguide transition structure 130 is configured to propagate the input electromagnetic wave to the differential transmission line 140 and output the electromagnetic wave from the differential transmission line 140 in the step S121.
In some embodiments, the step S120 includes a step S122, in the step S122, an electromagnetic wave is input through the differential transmission line 140, and the waveguide transition structure 130 is configured to propagate the input electromagnetic wave to the waveguide port 111 and output the electromagnetic wave through the waveguide port 111.
It is understood that the terms in the electromagnetic wave conversion method of the present embodiment have the same meanings as those in the waveguide conversion device 100, and specific implementation details can refer to the descriptions in the embodiment of the waveguide conversion device 100, and the exemplary descriptions and technical effects shown in the foregoing embodiment can be correspondingly implemented by the electromagnetic wave conversion method, which is not described again in this embodiment.
Application example 1
In an application example one, there is provided a waveguide conversion apparatus 100, where the waveguide 110 is a standard rectangular waveguide, and accordingly the waveguide port 111 of the waveguide 110 is rectangular. The matching member 131 of the waveguide conversion structure 130 is substantially rectangular, and the concave structure of the matching member 131 is arcuate, so as to have better continuity of impedance change.
Application example two
In the second application example, the structure of the waveguide conversion apparatus 100 is substantially the same as that in the first application example. The difference is that in the present application example, the waveguide conversion device 100 is applied to a WR-10 type rectangular waveguide of a W band, and the waveguide port 111 and the first slot are approximately set to be 2.54 × 1.27mm in size to match the WR-10 type rectangular waveguide.
Application example three
In a third application example, the waveguide conversion device 100 provided in the second application example is applied to a circuit module of a radar, the circuit module includes a plurality of waveguide conversion devices 100, the plurality of waveguide conversion devices 100 are arranged side by side on a printed circuit board, a distance between center lines of the transmission channels 122 of two adjacent waveguide conversion devices 100 is 1.27mm, that is, the arrangement of the transmission channels 122 is compact, so that a distance between the differential transmission lines 140 extending from two adjacent transmission channels 122 is small, and an integration degree of outer ends of the differential transmission lines 140 in the circuit module is high.
Application example four
In a fourth application example, the waveguide switching device 100 provided in the second application example is applied to a circuit module for testing, the circuit module for testing includes the waveguide switching device 100 and a radar rf board chip connected to the differential transmission line 140, a connection antenna can be coupled to the waveguide port 111, and the connection antenna can be tested by testing an electromagnetic wave signal received by the radar rf board chip.
The waveguide conversion device 100, the circuit module and the electromagnetic wave conversion method provided in the present application are described in detail above, and the principles and embodiments of the present application are explained herein by applying specific examples, and the description of the above embodiments is only used to help understand the method and the core concept of the present application; meanwhile, for a person skilled in the art, according to the idea of the present application, there may be variations in the specific embodiments and the application scope, and in summary, the content of the present specification should not be construed as a limitation to the present application.
Claims (10)
1. A waveguide conversion apparatus, comprising,
a waveguide having a waveguide opening penetrating a thickness direction of the waveguide;
the dielectric substrate is arranged perpendicular to the waveguide port and provided with a metal layer, the metal layer is provided with a first windowing and a transmission channel which are communicated, the peripheral sides of the first windowing and the transmission channel are provided with metal grounds, and the first windowing is arranged corresponding to the waveguide port and communicated with the waveguide port;
a waveguide conversion structure disposed within the first fenestration; and
a differential transmission line disposed within the transmission channel and connected to the waveguide transition structure;
wherein the waveguide transition structure is used for realizing the propagation of electromagnetic waves between the waveguide port and the differential transmission line.
2. The waveguide conversion device of claim 1, wherein the shape and position of the first window matches a projection of the waveguide port on the dielectric substrate.
3. The waveguide conversion apparatus of claim 2, wherein the waveguide conversion structure comprises a matching member and an impedance transformation member connected, wherein the matching member is disposed opposite the waveguide port and has an impedance width, and the impedance transformation member is connected to the differential transmission line.
4. The waveguide conversion device according to claim 3, wherein the waveguide port, the first window and the matching member are rectangular, the matching member has opposite wide sides and opposite narrow sides, the opposite wide sides are symmetrically formed with concave structures concave toward the middle, and the matching member is formed with the impedance width between the two concave structures.
5. The waveguide conversion device according to claim 4, wherein the recessed structure has an arcuate, triangular or stepped shape.
6. The waveguide conversion device according to claim 3, wherein the metal ground is comprised of metalized vias disposed at intervals.
7. The waveguide conversion device according to claim 6, wherein the metalized vias disposed outside the two broadsides have a one-to-one correspondence and satisfy:
wherein, WeffThe metal via holes are arranged on the outer sides of the two wide sides in a one-to-one correspondence mode, W is the length of the narrow sides, D is the hole diameter of the metal via holes, and S is the center distance between two adjacent metal via holes arranged at intervals.
8. The waveguide conversion apparatus of claim 1,
the wavelength of the electromagnetic wave input into the waveguide conversion device is lambda;
a second window communicated with the waveguide corresponding to the transmission channel is arranged on the waveguide, the length of the second window in the thickness direction of the waveguide is H, and H satisfies the following conditions:
9. a circuit module, comprising:
at least one waveguide conversion device according to any one of claims 1-8; and
the waveguide conversion device comprises a printed circuit board, wherein a dielectric substrate of the waveguide conversion device is a part of the printed circuit board.
10. An electromagnetic wave conversion method, comprising the steps of:
s110, providing a waveguide conversion device according to any one of claims 1 to 8;
and S120, inputting electromagnetic waves to the waveguide conversion device, wherein the waveguide conversion device enables the input electromagnetic waves to propagate between the waveguide and the differential transmission line.
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| CN112467326A (en) * | 2020-12-07 | 2021-03-09 | 之江实验室 | Broadband rectangular waveguide-microstrip converter |
| CN113745787A (en) * | 2021-08-23 | 2021-12-03 | 格兰康希微电子系统(上海)有限公司 | Signal converter and microstrip line-waveguide signal conversion device |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112467326A (en) * | 2020-12-07 | 2021-03-09 | 之江实验室 | Broadband rectangular waveguide-microstrip converter |
| CN113745787A (en) * | 2021-08-23 | 2021-12-03 | 格兰康希微电子系统(上海)有限公司 | Signal converter and microstrip line-waveguide signal conversion device |
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