CN115693070A - DC isolator and microwave transmission system - Google Patents
DC isolator and microwave transmission system Download PDFInfo
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- CN115693070A CN115693070A CN202110851130.6A CN202110851130A CN115693070A CN 115693070 A CN115693070 A CN 115693070A CN 202110851130 A CN202110851130 A CN 202110851130A CN 115693070 A CN115693070 A CN 115693070A
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Abstract
The present disclosure relates to a dc isolator and microwave transmission system, comprising two opposite and coaxially arranged waveguides; the two waveguide tubes are connected through an anti-flow joint, and a connecting part is arranged at one end of each waveguide tube, which is far away from the anti-flow joint; the anti-flow joint comprises a first connecting part and a second connecting part positioned on one side of the first connecting part, the first connecting part is connected with one end of one of the waveguide tubes in a matched mode, and the second connecting part is connected with one end of the other waveguide tube in a matched mode; the first connecting portion and the second connecting portion are arranged in an insulating mode, an annular groove is formed in one face, facing the second connecting portion, of the first connecting portion, and the annular groove is arranged on the periphery of the through hole in the first connecting portion in an enclosing mode. According to the electromagnetic wave isolation device, the anti-current joint is arranged between the two waveguide tubes, so that the wave source and a load to be heated are electrically isolated, the normal transmission of electromagnetic waves in the DC isolator is ensured, meanwhile, the reflection coefficient of the electromagnetic waves in the DC isolator is low, the microwave leakage is less, and the transmission efficiency of the electromagnetic waves is improved.
Description
Technical Field
The present disclosure relates to the field of microwave transmission technologies, and in particular, to a dc isolator and a microwave transmission system.
Background
The microwave transmission system is used for connecting a microwave source and a load to be heated and is a microwave transmission channel. For a microwave heating system, a wave source generally needs to be externally connected with a high-voltage power supply to generate microwaves, and therefore, in order to ensure safety, the ground potential of the wave source system is usually subjected to suspension treatment to ensure the safety of a region to be heated under a fault condition. Because the microwave output port of the wave source is at ground potential and is connected with the microwave transmission system, in order to isolate the electrical connection between the wave source and the region to be heated, a transmission component, namely a dc isolator, which can realize the electrical isolation is needed to be adopted in the transmission system, and the dc isolator can realize the electrical isolation between the wave source and the region to be heated. Although the existing DC blocking device can realize the electric isolation of a wave source and a region to be heated, the problems of high electromagnetic wave reflection coefficient and low transmission efficiency exist in the microwave transmission process, and meanwhile, for electromagnetic waves with specific wavelengths, the DC blocking device usually needs to be customized and processed, so that the cost is high, and the period is long.
Disclosure of Invention
To solve the above technical problem or at least partially solve the above technical problem, the present disclosure provides a dc block and a microwave transmission system.
The present disclosure provides a dc insulator, comprising two opposite and coaxially arranged waveguides; the two waveguides are connected through the anti-flow joint, and one end of each waveguide, which is far away from the anti-flow joint, is provided with a connecting part for connecting an external transmission line;
the anti-current joint comprises a first connecting part and a second connecting part positioned on one side of the first connecting part, the first connecting part is connected with one end of one of the waveguide tubes in a matching way, the second connecting part is connected with one end of the other waveguide tube in a matching way, and the first connecting part and the second connecting part are provided with through holes corresponding to the inner cavities of the waveguide tubes so as to communicate the inner cavities of the two waveguide tubes;
the first connecting portion and the second connecting portion are arranged in an insulating mode, an annular groove is formed in one face, facing the second connecting portion, of the first connecting portion, and the annular groove is arranged on the periphery of the through hole in the first connecting portion in an enclosing mode.
Optionally, an insulating gasket is arranged between the first connecting portion and the second connecting portion, an avoiding hole is formed in the position, corresponding to the through hole, of the insulating gasket, and the aperture of the avoiding hole is not smaller than the outer diameter of the annular groove.
Optionally, the first connecting portion and the second connecting portion are connected by an insulating bolt, and the insulating gasket has a mounting hole through which the insulating bolt can pass.
Optionally, the cross section of the waveguide is rectangular, the groove depth of the annular groove is H, and H = λ p /4, wherein λ p The wavelength of the electromagnetic wave when the electromagnetic wave propagates in the annular groove; after the electromagnetic wave is transmitted out of the waveguide tube, the propagation distance along the radius direction of the annular groove is R, and R = lambda/4, wherein lambda is the working wavelength of the electromagnetic wave.
Optionally, the annular groove has an outer diameter D and an inner diameter D, and D =2 × (L/2 + λ/4), D ≧ a 2 +L 2 Wherein, L is the height of the inner cavity section of the waveguide tube, and a is the width of the inner cavity section of the waveguide tube.
Optionally, the waveguide has a width that gradually decreases in a direction from an end of the waveguide away from the choke to an end near the choke.
Optionally, in a direction from one end of the waveguide far away from the choke joint to one end close to the choke joint, the waveguide includes a first step section, a second step section and a third step section which are connected in sequence; the widths of the first step section, the second step section and the third step section are reduced in sequence.
Optionally, the width of the first step is a1, the width of the second step is a0, the width of the third step is a, and a, a1, and a0 satisfy the relational expression
Where λ is the operating wavelength of the electromagnetic wave.
Optionally, the length of the second step section is L1, and L1= λ/4.
The present disclosure further provides a microwave transmission system, including the above-mentioned dc blocking device.
Compared with the prior art, the technical scheme provided by the embodiment of the disclosure has the following advantages:
this is disclosed through relative and coaxial setting with two wave guides to connect through the anti-flow joint between two wave guides, and include first connecting portion and the second connecting portion that is located first connecting portion one side with the anti-flow joint, first connecting portion and second connecting portion insulation setting have guaranteed that the dc-blocking device can realize the separation to the direct current under the circumstances of normal transmission electromagnetic wave. Meanwhile, an annular groove is formed in one surface, facing the second connecting portion, of the first connecting portion, the annular groove is arranged around the periphery of the through hole of the first connecting portion, so that a choking structure of the choking connector is formed, a transmission path of electromagnetic waves in the choking connector can be equivalent to two sections of transmission lines, namely a transmission path along the radius direction of the annular groove and a transmission path along the inside of the annular groove, the electromagnetic waves are in short circuit at the terminals of the two sections of transmission lines, incident waves and reflected waves transmitted by the electromagnetic waves in the choking connector are basically counteracted, normal transmission of the electromagnetic waves in the waveguide is guaranteed, higher harmonics are restrained, and transmission efficiency of the electromagnetic waves in the waveguide is improved.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present disclosure and together with the description, serve to explain the principles of the disclosure.
In order to more clearly illustrate the embodiments or technical solutions in the prior art of the present disclosure, the drawings used in the embodiments or technical solutions in the prior art description will be briefly described below, and it is obvious for those skilled in the art that other drawings can be obtained according to these drawings without inventive labor.
Fig. 1 is a schematic structural view of a dc blocking device according to an embodiment of the disclosure;
fig. 2 is a schematic structural diagram of an anti-flow joint according to an embodiment of the disclosure;
FIG. 3 is a top view of a DC spacer according to an embodiment of the disclosure;
FIG. 4 isbase:Sub>A cross-sectional view taken along A-A of FIG. 3 according to an embodiment of the present disclosure;
FIG. 5 is an enlarged view of FIG. 4 at A according to an embodiment of the present disclosure;
FIG. 6 is a side view of a DC stop according to an embodiment of the disclosure;
FIG. 7 isbase:Sub>A cross-sectional view taken along A-A of FIG. 6 in accordance with an embodiment of the present disclosure;
fig. 8 is a schematic structural diagram of a waveguide according to an embodiment of the present disclosure.
Wherein, 1, waveguide; 11. a first step section; 12. a second step section; 13. a third step section; 2. an anti-flow connector; 21. a first connection portion; 22. a second connecting portion; 23. a through hole; 24. an annular groove; 3. a connecting portion; 4. an insulating spacer; 41. avoiding holes; 42. and (7) mounting holes.
Detailed Description
In order that the above objects, features and advantages of the present disclosure may be more clearly understood, aspects of the present disclosure will be further described below. It should be noted that the embodiments and features of the embodiments of the present disclosure may be combined with each other without conflict.
In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present disclosure, but the present disclosure may be practiced in other ways than those described herein; it is to be understood that the embodiments disclosed in the specification are only a few embodiments of the present disclosure, and not all embodiments.
The present disclosure provides a dc blocking device, as shown in fig. 1 and fig. 3, including two opposite and coaxially disposed waveguide tubes 1, where the waveguide tubes 1 are made of metal, and the coaxial arrangement can ensure normal transmission of electromagnetic waves in the waveguide tubes 1. The two waveguides 1 are connected through the choke connector 2, and the choke connector 2 is used to improve the transmission efficiency of electromagnetic waves in the waveguides 1 and to achieve electrical isolation of the two waveguides 1. The two waveguides 1 are provided with connecting parts 3 at the ends far away from the choke joint 2, that is, the connecting parts 3 are provided at the two ends of the dc isolator, and the connecting parts 3 are used for connecting an external transmission line.
Specifically, the connecting portion 3 may have a flange structure, which may be a square flange, a circular flange, or the like. The DC insulator can also determine whether the flange structure needs vacuum sealing according to the transmission requirement. The connecting part 3 can also be other structures which can realize the fixed connection of the external transmission line and the DC-DC isolator.
As shown in fig. 2, the choke connector 2 includes a first connection portion 21 and a second connection portion 22 on the side of the first connection portion 21. The first connecting portion 21 is connected to one end of one of the waveguides 1 in a matching manner, and the second connecting portion 22 is connected to one end of the other waveguide 1 in a matching manner. Through holes 23 corresponding to the inner cavities of the waveguides 1 are formed in the first connecting portion 21 and the second connecting portion 22, so that the inner cavities of the two waveguides 1 are communicated, and normal transmission of electromagnetic waves is guaranteed.
The first connection portion 21 and the second connection portion 22 are engaged to ensure normal transmission of electromagnetic waves and to ensure that direct current cannot pass through. The first connection portion 21 and the second connection portion 22 are provided with insulation therebetween, and mating surfaces of the first connection portion 21 and the second connection portion 22 are perpendicular to the axial direction of the waveguide 1. The annular groove 24 is formed in the surface, facing the second connecting portion 22, of the first connecting portion 21, and the annular groove 24 forms a choking structure of the choking joint 2, so that higher harmonics can be suppressed in the transmission process of electromagnetic waves, interference of the higher harmonics to peripheral electronic equipment is prevented, and the transmission efficiency of the electromagnetic waves in the waveguide 1 is guaranteed. And at this time, the transmission direction of the electromagnetic wave is transmitted from the waveguide 1 provided with the first connection portion 21 to the other waveguide 1. The annular groove 24 is arranged around the periphery of the through hole 23 of the first connecting portion 21 and is located at the center of the end face where the first connecting portion 21 and the second connecting portion 22 are matched.
In other embodiments, the annular groove 24 may also be disposed on a surface of the second connecting portion 22 facing the first connecting portion 21, and the transmission direction of the electromagnetic wave is transmitted from the waveguide 1 provided with the second connecting portion 22 to another waveguide 1, that is, the opening direction of the annular groove 24 and the transmission direction of the electromagnetic wave are the same.
In the embodiment, the two waveguides 1 are arranged oppositely and coaxially, and the two waveguides 1 are connected through the choke joint 2, the choke joint 2 comprises the first connecting part 21 and the second connecting part 22 located on one side of the first connecting part 21, and the first connecting part 21 and the second connecting part 22 are arranged in an insulating manner, so that the direct current can be blocked by the direct current blocking device under the condition of normal transmission of electromagnetic waves. Meanwhile, an annular groove 24 is formed in one surface of the first connecting portion 21 facing the second connecting portion 22, the annular groove 24 is arranged around the periphery of the through hole 23 of the first connecting portion 21, so that a choking structure of the choking connector 2 is formed, a transmission path of electromagnetic waves in the choking connector 2 can be equivalent to two sections of transmission lines, namely a transmission path along the radius direction of the annular groove 24 and a transmission path along the inside of the annular groove 24, the electromagnetic waves are short-circuited at the terminals of the two sections of transmission lines, incident waves and reflected waves transmitted by the electromagnetic waves in the choking connector 2 are basically counteracted, normal transmission of the electromagnetic waves in the waveguide is guaranteed, higher harmonics are suppressed, and the transmission efficiency of the electromagnetic waves in the waveguide 1 is improved.
Specifically, as shown in fig. 2, an insulating spacer 4 is disposed between the first connecting portion 21 and the second connecting portion 22, the insulating spacer 4 may be made of teflon, and a avoiding hole 41 is disposed at a position of the insulating spacer 4 corresponding to the through hole 23 to ensure normal transmission of electromagnetic waves in the waveguide 1. The aperture of the avoiding hole 41 is not smaller than the outer diameter of the annular groove 24, so as to ensure that the avoiding hole 41 does not cover the annular groove 24, and the anti-flow function of the annular groove 24 is not affected.
For the thickness setting of the insulating spacer 4, the electromagnetic wave transmission performance simulation verification may be performed on the dc blocking device first to determine the optimal thickness of the insulating spacer 4, so as to achieve electrical isolation on the premise of ensuring higher electromagnetic wave transmission efficiency of the dc blocking device. If the thickness of the insulating spacer 4 is too small, the function of effective electrical isolation cannot be achieved, and if the thickness of the insulating spacer 4 is too large, a large amount of electromagnetic waves leak from the insulating spacer 4, which affects the transmission efficiency of the electromagnetic waves.
Further, first connecting portion 21 is connected through insulating bolt (not shown in the figure) with second connecting portion 22, and insulating bolt can be made by insulating materials such as nylon, plastics, is provided with the installation through-hole of mutually supporting on first connecting portion 21 and the second connecting portion 22, and the quantity of installation through-hole can set up according to actual need. The insulating gasket 4 has mounting holes 42 through which insulating bolts can pass, and the arrangement positions and the number of the mounting holes 42 match with those of the mounting through holes. Carry out fixed connection with first connecting portion 21 and second connecting portion 22 through insulating bolt, under the function of guaranteeing first connecting portion 21 and second connecting portion 22 to realize electric isolation, still guaranteed the structural strength of dc spacer.
In other embodiments, the first connection portion 21 and the second connection portion 22 may be insulated and connected in other manners, for example, the first connection portion 21 and the second connection portion 22 may be adhered together by the insulating gasket 4.
Specifically, the first connecting portion 21 is a first flange, and the annular groove 24 is disposed on an end surface of the first flange facing the second connecting portion 22, and the first flange has a certain thickness to ensure that the annular groove 24 has a sufficient depth. The second connecting portion 22 is a second flange plate that is fitted to the first flange plate, and the first flange plate and the second flange plate are connected in an insulated manner. In this embodiment, the first flange and the second flange are configured to be rectangular, but they may also be circular, oval, or other shapes.
As shown in fig. 4 and 5, the annular groove 24 has a groove depth H, and H = λ p /4, where λ p Is the wavelength at which the electromagnetic wave propagates in the annular groove 24. After the electromagnetic wave of the annular groove 24 is transmitted out of the waveguide 1, the propagation distance along the radius direction of the annular groove 24 is R, and R = λ/4, where λ is the operating wavelength of the electromagnetic wave. As shown in fig. 7, fig. 7 isbase:Sub>A sectional view of the first connection portion 21 in thebase:Sub>A-base:Sub>A direction of fig. 6. The outer diameter of the annular groove 24 is D, the inner diameter is D, the section of the inner cavity of the waveguide tube 1 is a rectangular structure, the width of the rectangular structure is a, and the height of the rectangular structure is L. The width direction of the rectangular structure refers to the horizontal direction perpendicular to the axial direction of the waveguide tube, and the height direction of the rectangular structure refers to the vertical direction perpendicular to the axial direction of the waveguide tube. The annular groove 24 has an outer diameter D =2 (L/2 + lambda/4) and an inner diameter D ≧ (a) 2 +L 2 ). The transmission path of the electromagnetic wave in the choke plug 2 may be equivalent to two transmission lines, namely, a transmission path R along the radius direction of the annular groove 24 and a transmission path H along the inside of the annular groove 24, where R = λ/4 and H = λ p And/4, the electromagnetic wave is short-circuited at the terminals of the two transmission lines. The short-circuit terminal of the waveguide 1 is spaced from the input end of the electromagnetic wave at the choke joint 2 by about lambda/2, namely, the incident wave and the reflected wave transmitted by the electromagnetic wave in the choke joint 2 are basically resistedTherefore, the input end of the choke joint 2 can be equivalently short-circuited, and the normal transmission of electromagnetic waves in the waveguide is ensured.
In other embodiments, the cross section of the waveguide 1 may also be circular or other shapes, which is not limited herein.
As shown in fig. 1, when the dimensions of the choke joint 2 and the waveguide 1 are not matched, for example, the dimensions of the waveguide 1 are too large, and the dimensions of the choke joint 2 are too small to be processed and installed, the width of the waveguide 1 may be gradually reduced in a direction from an end of the waveguide 1 far from the choke joint 2 to an end near the choke joint 2, wherein the width direction of the waveguide 1 refers to a horizontal direction perpendicular to the axial direction of the waveguide in fig. 1. By changing the width of the waveguide tube 1, the waveguide tube 1 and the choke joint 2 can be processed and installed, and the waveguide tube 1 can realize impedance matching, so that electromagnetic waves can more efficiently pass through the DC isolator, and the transmission efficiency of the DC isolator to the electromagnetic waves is improved.
Specifically, as shown in fig. 8, the waveguide 1 includes a first step section 11, a second step section 12, and a third step section 13 connected in this order in a direction from an end of the waveguide 1 far from the choke joint 2 to an end near the choke joint 2. The widths of the first step 11, the second step 12 and the third step 13 are reduced in order. The width of the first step 11 is a1, the width of the second step 12 is a0, and the width of the third step 13 is a. The impedance matching between the step sections of the DC blocking device is ensured according to the impedance matching principle, and the electromagnetic wave propagation mode in the DC blocking device is supposed to be TE10 single-mode transmission according to the impedance matching principle
(Z is the impedance of the third step 13, Z 1 Is the impedance of the first step 11, Z 0 Is the impedance of the second step section 12,
eta is the dielectric wave impedance, lambda c Is a cut-off wavelength), wherein a, a1, a0 satisfy the relation
The impedance matching among the step sections of the DC blocking device can ensure the transmission efficiency of the electromagnetic waves, and the widths of the first step section 11, the second step section 12 and the third step section 13 are calculated according to the impedance matching principle so as to improve the transmission efficiency of the electromagnetic waves.
Preferably, the length of the second step 12 is L1, and L1= λ/4, and the lengths of the first step 11 and the third step 13 are set as required, and are not particularly limited herein.
Optionally, the dc-blocking device further comprises a cooling device (not shown in the figure), which is arranged at the mating position of the first connecting portion 21 and the second connecting portion 22. The cooling device is used for absorbing electromagnetic waves leaked from the matching part of the first connecting part 21 and the second connecting part 22 and heat deposited on the first connecting part and the second connecting part so as to prevent the DC blocking device from being overheated and affecting the performance of the DC blocking device.
Specifically, the cooling device is a cooling water pipe surrounding the matching position of the first connecting portion 21 and the second connecting portion 22. The cold water pipe may be disposed inside the first connection portion 21, or may be separately disposed outside a portion where the first connection portion 21 and the second connection portion 22 are engaged.
The embodiment also provides a microwave transmission system which comprises the DC-isolator.
By arranging the DC isolator, the electromagnetic waves in the microwave transmission system can be efficiently transmitted to a load area from a wave source, the transmission of higher harmonics can be effectively inhibited, the transmission of direct current on the DC isolator can be prevented, and the transmission efficiency of the electromagnetic waves is improved.
It is noted that, in this document, relational terms such as "first" and "second," and the like, may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, 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 phrases "comprising a," "8230," "8230," or "comprising" does not exclude the presence of additional like elements in a process, method, article, or apparatus that comprises the element.
The foregoing are merely exemplary embodiments of the present disclosure, which enable those skilled in the art to understand or practice the present disclosure. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the disclosure. Thus, the present disclosure is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (10)
1. A dc-isolator, characterized by comprising two opposite and coaxially arranged waveguides (1); the two waveguide tubes (1) are connected through an anti-flow joint (2), and one end of each waveguide tube (1) far away from the anti-flow joint (2) is provided with a connecting part (3) for connecting an external transmission line;
the anti-current connector (2) comprises a first connecting part (21) and a second connecting part (22) positioned on one side of the first connecting part (21), the first connecting part (21) is connected with one end of one waveguide tube (1) in a matching way, the second connecting part (22) is connected with one end of the other waveguide tube (1) in a matching way, and through holes (23) corresponding to the inner cavities of the waveguide tubes (1) are formed in the first connecting part (21) and the second connecting part (22) so as to enable the inner cavities of the two waveguide tubes (1) to be communicated;
first connecting portion (21) with insulating the setting between second connecting portion (22), just first connecting portion (21) face be provided with annular groove (24) on the one side of second connecting portion (22), annular groove (24) enclose establish first connecting portion (21) the periphery of through-hole (23).
2. The DC isolator according to claim 1, wherein an insulating gasket (4) is arranged between the first connecting portion (21) and the second connecting portion (22), an avoiding hole (41) is formed in a position, corresponding to the through hole (23), of the insulating gasket (4), and the diameter of the avoiding hole (41) is not smaller than the outer diameter of the annular groove (24).
3. The DC-spacer according to claim 2, characterized in that the first connecting portion (21) and the second connecting portion (22) are connected by an insulating bolt, and the insulating washer (4) has a mounting hole (42) through which the insulating bolt can pass.
4. The DC-isolator according to claim 1, characterized in that the waveguide (1) has a rectangular cross-section, the annular groove (24) has a groove depth H, and H = λ p /4, where λ p Is the wavelength of the electromagnetic wave when propagating in the annular groove (24); after the electromagnetic wave is transmitted out of the waveguide tube (1), the propagation distance along the radius direction of the annular groove (24) is R, and R = lambda/4, wherein lambda is the working wavelength of the electromagnetic wave.
5. The DC-spacer as claimed in claim 4, characterized in that the annular groove (24) has an outer diameter D and an inner diameter D, and D =2 x (L/2 + λ/4), D ≧ a 2 +L 2 Wherein L is the height of the section of the inner cavity of the waveguide tube (1), and a is the width of the section of the inner cavity of the waveguide tube (1).
6. The DC-isolator according to claim 1, characterized in that the width of the waveguide (1) decreases gradually in a direction from the end of the waveguide (1) remote from the choke joint (2) to the end close to the choke joint (2).
7. The DC-isolator according to claim 6, characterized in that the waveguide (1) comprises a first step section (11), a second step section (12) and a third step section (13) connected in sequence in the direction from the end of the waveguide (1) far away from the anti-flow joint (2) to the end near the anti-flow joint (2); the widths of the first step section (11), the second step section (12) and the third step section (13) are reduced in sequence.
8. The DC-spacer according to claim 7, wherein the width of the first step (11) is a1, the width of the second step (12) is a0, the width of the third step (13) is a, and a, a1, a0 satisfy the relation
Where λ is the operating wavelength of the electromagnetic wave.
9. The DC-spacer according to claim 7, characterized in that the length of the second step (12) is L1, and L1= λ/4.
10. A microwave transmission system comprising a dc block according to any one of claims 1 to 9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110851130.6A CN115693070A (en) | 2021-07-27 | 2021-07-27 | DC isolator and microwave transmission system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110851130.6A CN115693070A (en) | 2021-07-27 | 2021-07-27 | DC isolator and microwave transmission system |
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| Publication Number | Publication Date |
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| CN115693070A true CN115693070A (en) | 2023-02-03 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202110851130.6A Pending CN115693070A (en) | 2021-07-27 | 2021-07-27 | DC isolator and microwave transmission system |
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| CN (1) | CN115693070A (en) |
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- 2021-07-27 CN CN202110851130.6A patent/CN115693070A/en active Pending
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