CN111883892B - Broadband liquid attenuator based on T-shaped resistance network - Google Patents
Broadband liquid attenuator based on T-shaped resistance network Download PDFInfo
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- CN111883892B CN111883892B CN202010716894.XA CN202010716894A CN111883892B CN 111883892 B CN111883892 B CN 111883892B CN 202010716894 A CN202010716894 A CN 202010716894A CN 111883892 B CN111883892 B CN 111883892B
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- 239000007788 liquid Substances 0.000 title claims abstract description 120
- 230000005540 biological transmission Effects 0.000 claims abstract description 54
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 30
- 230000008859 change Effects 0.000 claims abstract description 27
- 239000002184 metal Substances 0.000 claims description 9
- 229910052751 metal Inorganic materials 0.000 claims description 9
- FAPWRFPIFSIZLT-UHFFFAOYSA-M Sodium chloride Chemical compound [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 claims description 5
- 239000011780 sodium chloride Substances 0.000 claims description 5
- 230000007704 transition Effects 0.000 claims description 3
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 2
- 229910052802 copper Inorganic materials 0.000 claims description 2
- 239000010949 copper Substances 0.000 claims description 2
- 239000011347 resin Substances 0.000 claims description 2
- 229920005989 resin Polymers 0.000 claims description 2
- 230000017525 heat dissipation Effects 0.000 abstract description 8
- 239000000463 material Substances 0.000 abstract description 6
- 230000009471 action Effects 0.000 abstract description 3
- 238000005259 measurement Methods 0.000 abstract description 3
- 238000004088 simulation Methods 0.000 description 5
- 238000005034 decoration Methods 0.000 description 2
- 238000013461 design Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000002146 bilateral effect Effects 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000001788 irregular Effects 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 230000008054 signal transmission Effects 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
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Classifications
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01P—WAVEGUIDES; RESONATORS, LINES, OR OTHER DEVICES OF THE WAVEGUIDE TYPE
- H01P1/00—Auxiliary devices
- H01P1/22—Attenuating devices
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01P—WAVEGUIDES; RESONATORS, LINES, OR OTHER DEVICES OF THE WAVEGUIDE TYPE
- H01P1/00—Auxiliary devices
- H01P1/30—Auxiliary devices for compensation of, or protection against, temperature or moisture effects ; for improving power handling capability
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- Attenuators (AREA)
Abstract
The invention discloses a broadband liquid attenuator based on a T-shaped resistance network, which comprises: the ground plate, by the second liquid resistance and lie in the second liquid resistance left and right sides and symmetrical first liquid resistance T type resistance attenuation network that constitutes, the gradual change transmission line 4 that is connected with first liquid resistance, lie in the parallel plate transmission line between feed port and the gradual change transmission line, lie in water outlet and the water inlet of transparent whole container structure side and bottom surface respectively. Based on the T-shaped resistance attenuation network, the broadband liquid attenuator with the attenuation of 12dB and the working frequency of DC-3GHz is realized, and the fluctuation of the attenuation value within 2GHz is not more than 2.6 dB. The invention adopts the liquid attenuation material, can improve the heat dissipation efficiency of the attenuator through the self-circulation system, realizes the compact attenuator structure through the direct action of the microwave and the circulating liquid, and can be used for future high-power microwave measurement.
Description
Technical Field
The invention belongs to the technical field of radio frequency, and particularly relates to a liquid attenuator.
Background
With the increasing development of wireless communication systems, the requirements for microwave devices, especially high-power microwave devices, are increasing. The traditional attenuator is mainly designed by the idea of filling solid attenuation materials, the heat is concentrated, and the heat dissipation path is limited in many aspects. When high-power microwave measurement is carried out, particularly in the field of aerospace, high-power emitting devices are often involved, heat generated by absorbing microwave energy in the test process cannot be effectively dissipated in time, so that the temperature of an attenuation material is continuously increased until the attenuator is damaged, and the existing attenuator mainly adopts external water cooling or radiating fin loading for indirect heat dissipation and has a larger size. Therefore, the attenuator with high heat dissipation efficiency and compact structure is very important.
Disclosure of Invention
The purpose of the invention is as follows: aiming at the prior art, the broadband liquid attenuator based on the T-shaped resistor network is provided, and the problem that the traditional attenuator is insufficient in the aspects of heat dissipation efficiency and working bandwidth is solved.
The technical scheme is as follows: a broadband liquid attenuator based on a T-shaped resistor network is of a symmetrical three-dimensional structure and comprises a grounding plate, a first liquid resistor, a second liquid resistor, a gradual change transmission line, a parallel plate transmission line, a feed port, a transparent plate, a water inlet and a water outlet;
the gradual change transmission line and the parallel plate transmission line both comprise positive plates, and the grounding plate is simultaneously used as the negative plates of the gradual change transmission line and the parallel plate transmission line; the left side and the right side of the second liquid resistor are respectively connected with symmetrical first liquid resistors; the first liquid resistor is a triangular prism, and the top and the bottom of the first liquid resistor are respectively an isosceles triangle connected with the positive plate of the gradual change transmission line and the second liquid resistor; the second liquid resistor is composed of two triangular prisms which are symmetrically connected left and right, the tops and the bottoms of the two triangular prisms are respectively isosceles triangles connected with the first liquid resistor and the grounding plate, and the top isosceles triangles of the two triangular prisms are respectively completely superposed with the bottom isosceles triangle of the first liquid resistor;
the first liquid resistor and the second liquid resistor form a liquid container through a transparent plate, and the ground plate and the gradual change transmission line are wrapped in the transparent plate; the feed ports are positioned at two ends of the broadband liquid attenuator; the parallel plate transmission line part is wrapped by the transparent plate, and the parallel plate transmission line is used as a transition structure between the feed structure and the gradual change transmission line;
the water inlet is positioned at the bottom of the grounding plate and faces the center of the bottom of the second liquid resistor, and a through hole is formed in the position, facing the water inlet, of the grounding plate; the water outlets comprise two water outlets which are respectively positioned at the center positions of the tops of the left and right first liquid resistors.
Has the advantages that: compared with the traditional attenuator, the broadband liquid attenuator based on the T-shaped resistance network has the following remarkable advantages that: (1) the invention adopts the resistance type attenuation network, and has the characteristics of flexible design, stable performance, high reliability and the like; (2) the invention adopts the saline water as the liquid attenuation material, has the characteristics of low cost, easy acquisition and the like, and can realize the self-circulation heat dissipation of the liquid by utilizing the liquidity and the heat conductivity of the liquid; (3) the invention combines the T-shaped resistance attenuation network, adopts saline water as a liquid attenuation material, improves the heat dissipation efficiency of the attenuator through a self-circulation system, and ensures that the attenuator still has good attenuation and a compact structure under the high-power state through the direct action of microwaves and circulating liquid.
Drawings
FIG. 1 is a perspective view of a three-dimensional structure of a broadband liquid attenuator according to an embodiment of the present invention;
FIG. 2 is a plan view of a ground plate of a broadband liquid attenuator in accordance with an embodiment of the present invention;
FIG. 3 is a perspective view of a T-shaped liquid resistor of a broadband liquid attenuator in accordance with an embodiment of the present invention;
FIG. 4 is a front view of a T-shaped liquid resistor of a broadband liquid attenuator in accordance with an embodiment of the present invention;
FIG. 5 is a top view of a T-shaped liquid resistor of a broadband liquid attenuator in accordance with an embodiment of the present invention;
FIG. 6 is a left side view of a T-shaped liquid resistor of a broadband liquid attenuator in accordance with an embodiment of the present invention;
FIG. 7 is a bottom view of a T-shaped liquid resistor of a broadband liquid attenuator in accordance with an embodiment of the present invention;
FIG. 8 is a block diagram of a T-shaped liquid resistive transparent container of a broadband liquid attenuator in accordance with an embodiment of the present invention;
FIG. 9 is an exploded view of a T-shaped liquid resistive transparent container structure of a broadband liquid attenuator in accordance with an embodiment of the present invention;
FIG. 10 is a schematic diagram of a triangular prism constituting a second liquid resistor in the broadband liquid attenuator according to the embodiment of the present invention;
FIG. 11 is a view showing the construction of an integral container formed by a transparent plate in the broadband liquid attenuator in accordance with the embodiment of the present invention;
FIG. 12 is a cross-sectional view of FIG. 11;
FIG. 13 is a front view of an integral container formed by a transparent plate in a broadband liquid attenuator in accordance with an embodiment of the present invention;
FIG. 14 is a left side view of the integral container formed by the transparent plate in the broadband liquid attenuator of an embodiment of the present invention;
FIG. 15 is a perspective view of an integral container formed by a transparent plate in a broadband liquid attenuator in accordance with an embodiment of the present invention;
FIG. 16 is a T-type resistance attenuation network-based method according to an embodiment of the present inventionS of broadband liquid attenuator11A curve simulation graph;
FIG. 17 is S of a broadband liquid attenuator based on a T-type resistive attenuation network according to an embodiment of the present invention21And (5) a curve simulation graph.
Detailed Description
The invention is further explained below with reference to the drawings.
As shown in figure 1, the broadband liquid attenuator based on the T-shaped resistor network is a symmetrical three-dimensional structure and comprises a grounding plate 1, a first liquid resistor 2, a second liquid resistor 3, a gradual change transmission line 4, a parallel plate transmission line 5, a feed port 6, a transparent plate 7, a water inlet 8 and a water outlet 9.
The tapered transmission line 4 and the parallel-plate transmission line 5 each include a positive plate, and the ground plate 1 serves as both the negative plates of the tapered transmission line 4 and the parallel-plate transmission line 5. As shown in fig. 3 to 9, the first liquid resistors 2 are connected symmetrically to the left and right sides of the second liquid resistor 3. The first liquid resistor 2 is a triangular prism, and the top and the bottom of the first liquid resistor 2 are respectively an isosceles triangle connected with the positive plate of the gradual change transmission line 4 and the second liquid resistor 3. The second liquid resistor 3 is composed of two triangular prisms which are connected in bilateral symmetry and are shown in fig. 10, the tops and the bottoms of the two triangular prisms are isosceles triangles connected with the first liquid resistor 2 and the grounding plate 1 respectively, and the top isosceles triangles of the two triangular prisms are completely overlapped with the bottom isosceles triangles of the first liquid resistor 2 respectively.
The first liquid resistor 2 and the second liquid resistor 3 form a liquid container by a transparent plate 7, and the transparent plate 7 also wraps the grounding plate 1 and the gradual change transmission line 4 inside to form an integral container structure with the liquid container, as shown in figures 11-15. The feed port 6 is located at both ends of the broadband liquid attenuator. The parallel-plate transmission line 5 is partly surrounded by a transparent plate 7, the parallel-plate transmission line 5 acting as a transition between the feed structure 6 and the tapered transmission line 4 facilitating impedance continuity. The feed port 6 is connected with the grounding plate 1 by adopting a cuboid metal block; and a cylindrical groove is formed in the side face of the cuboid metal block, and the cylindrical groove is used for fixing the radio frequency coaxial connector. The water inlet 8 is positioned at the bottom of the grounding plate 1 and faces the central position of the bottom of the second liquid resistor 3, and a through hole is formed in the position, facing the water inlet 8, of the grounding plate 1. The water outlets 9 comprise two water outlets which are respectively positioned at the top center positions of the left first liquid resistor 2 and the right first liquid resistor 2.
In this embodiment, two first liquid resistors 2 and one second liquid resistor 3 form a T-shaped resistor attenuation network. Three side edges of the triangular prism of the first liquid resistor 2 are respectively 44mm, 22mm and 22mm in length, the bottom side of the top isosceles triangle is 14mm in length, the waist length is 53mm, the bottom side of the bottom isosceles triangle is 14mm in length, and the waist length is 20 mm. Three side edges of two triangular prisms respectively forming the second liquid resistor 3 are respectively 3mm, 20mm and 20mm in length, the bottom side length of the top isosceles triangle is 14mm, the waist length is 20mm, the bottom side length of the bottom isosceles triangle is 14mm, and the waist length is 11 mm. The first liquid resistor 2 and the second liquid resistor 3 are both prepared by using saline water with the conductivity of 3.53S/m, and for an attenuator with the attenuation of 12dB, the resistance value of the first liquid resistor 2 is 30 omega, and the resistance value of the second liquid resistor 3 is 27 omega. The first liquid resistor 2 is designed as a tapered structure so that the impedance changes gradually in the tapered transmission line 4, thereby reducing reflection.
The positive plate and the ground plate 1 of the gradual change transmission line 4 and the parallel plate transmission line 5 are both formed by cutting a metal copper plate with the thickness of 2mm, and the whole volume of the attenuator is 164 multiplied by 104 multiplied by 46mm3Length x width x height. The gradual change transmission line 4 is selected as a signal transmission line, the length of the gradual change transmission line 4 on one side is 43.5mm, the maximum section width is 100mm, the height is 42mm, the minimum section width is 50mm, and the height is 14 mm. The gradual change angle of the gradual change transmission line 4 is 31 degrees, which is beneficial to realizing the impedance matching between the gradual change transmission line and the T-shaped resistance attenuation network. The length of the parallel plate transmission line 5 on one side is 21mm, the section width is 50mm, and the height is 14 mm. The cuboid metal block of the feed port 6 is 7mm long, 16mm wide and 18mm high, the diameter of the side surface of the cylindrical groove is 4.1mm, and the length is 7 mm; the feeding port adopts a 50 omega coaxial feeding interface. As shown in figure 2, the grounding plate 1 is a symmetrical structure, comprises a negative plate of a gradual change transmission line 4 and a parallel plate transmission line 5 and a middle cuboid metal plate, the overall length of the grounding plate is 164mm, the width of the grounding plate is 100mm, and a cylindrical groove is cut at the center of the grounding plate and is communicated with a water outlet 9. Accommodating a tapered transmission line 4, parallel plate transmissionThe transmission line 5 and the transparent irregular container of the liquid resistor are made of transparent resin, the dielectric constant is 2.7, and the thickness is 2 mm. The water inlet 8 and the water outlet 9 are hollow cylinders with the inner diameter of 2mm, the outer diameter of 6mm and the height of 20mm, and are used for liquid circulation in the T-shaped resistance attenuation network.
The application effect of the present invention will be described in detail with reference to the simulation.
FIG. 16 shows S of the simulation of the present embodiment11Versus frequency. It can be seen that the attenuator has S in the DC-3GHz frequency band11Typical values are less than-10 dB, indicating that the transmission line has good matching performance with the T-type resistive attenuation network.
FIG. 17 shows S of the simulation of the present embodiment21Versus frequency. It can be seen that the attenuation value (S) of the present invention21) The attenuation value is 12dB in a DC-3GHz frequency band and S in the frequency band21Has good flatness.
In conclusion, the attenuator is of a three-dimensional symmetrical structure, the T-shaped resistance attenuation network is combined, the saline water is used as the liquid attenuation material, the heat dissipation efficiency of the attenuator is improved through the self-circulation system, and the attenuator has good attenuation characteristics and a compact structure in a high-power state through the direct action of the microwaves and the circulating liquid. The design gives full play to the characteristics of liquid such as fluidity, conductivity, transparency and the like, and can be applied to high-power microwave measurement.
The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, various modifications and decorations can be made without departing from the principle of the present invention, and these modifications and decorations should also be regarded as the protection scope of the present invention.
Claims (6)
1. The broadband liquid attenuator based on the T-shaped resistor network is characterized by being of a symmetrical three-dimensional structure and comprising a grounding plate (1), a first liquid resistor (2), a second liquid resistor (3), a gradual change transmission line (4), a parallel plate transmission line (5), a feed port (6), a transparent plate (7), a water inlet (8) and a water outlet (9);
the gradual change transmission line (4) and the parallel plate transmission line (5) both comprise positive plates, and the grounding plate (1) is simultaneously used as the negative plates of the gradual change transmission line (4) and the parallel plate transmission line (5); the left side and the right side of the second liquid resistor (3) are respectively connected with a symmetrical first liquid resistor (2); the first liquid resistor (2) is a triangular prism, and the top and the bottom of the first liquid resistor (2) are respectively an isosceles triangle connected with the positive plate of the gradual change transmission line (4) and the second liquid resistor (3); the second liquid resistor (3) is composed of two triangular prisms which are symmetrically connected left and right, the tops and the bottoms of the two triangular prisms are respectively isosceles triangles connected with the first liquid resistor (2) and the grounding plate (1), and the top isosceles triangles of the two triangular prisms are respectively completely superposed with the bottom isosceles triangle of the first liquid resistor (2);
the first liquid resistor (2) and the second liquid resistor (3) form a liquid container through a transparent plate (7), and the ground plate (1) and the gradual change transmission line (4) are wrapped in the transparent plate (7); the feed ports (6) are positioned at two ends of the broadband liquid attenuator; the parallel plate transmission line (5) is partially wrapped by the transparent plate (7), and the parallel plate transmission line (5) is used as a transition structure between the feed port (6) and the gradual change transmission line (4); the water inlet (8) is positioned at the bottom of the grounding plate (1) and faces the center of the bottom of the second liquid resistor (3), and a through hole is formed in the position, facing the water inlet (8), of the grounding plate (1); the water outlets (9) comprise two water outlets which are respectively positioned at the center positions of the tops of the left and right first liquid resistors (2).
2. The broadband liquid attenuator based on the T-shaped resistance network according to claim 1, characterized in that the grounding plate (1) has an overall length of 164mm and a width of 100 mm; the length of the gradual change transmission line (4) on one side is 43.5mm, the maximum section width is 100mm, the height is 42mm, the minimum section width is 50mm, and the height is 14 mm; the gradual change angle of the gradual change transmission line (4) is 31 degrees; the length of the parallel plate transmission line (5) on one side is 21mm, the section width is 50mm, and the height is 14 mm.
3. The broadband liquid attenuator based on the T-shaped resistor network as claimed in claim 2, wherein the three side edges of the triangular prism of the first liquid resistor (2) are respectively 44mm, 22mm and 22mm long, the bottom side length of the top isosceles triangle is 14mm, the waist length is 53mm, the bottom side length of the bottom isosceles triangle is 14mm, and the waist length is 20 mm; three side edges of two triangular prisms respectively forming the second liquid resistor (3) are respectively 3mm, 20mm and 20mm in length, the bottom side length of the top isosceles triangle is 14mm, the waist length is 20mm, the bottom side length of the bottom isosceles triangle is 14mm, and the waist length is 11 mm; the first liquid resistor (2) and the second liquid resistor (3) are both prepared from saline with the conductivity of 3.53S/m, the resistance value of the first liquid resistor (2) is 30 omega, and the resistance value of the second liquid resistor (3) is 27 omega.
4. The broadband liquid attenuator based on the T-shaped resistor network as claimed in claim 3, wherein the transparent plate (7) is made of transparent resin, has a dielectric constant of 2.7 and a thickness of 2 mm; the water inlet (8) and the water outlet (9) are hollow cylinders, the inner diameter is 2mm, the outer diameter is 6mm, and the height is 20 mm.
5. The broadband liquid attenuator based on the T-shaped resistance network according to claim 3, wherein the positive plate of the graded transmission line (4) and the parallel plate transmission line (5) and the grounding plate (1) are all cut by a metal copper plate with the thickness of 2 mm.
6. The broadband liquid attenuator based on the T-shaped resistance network as claimed in claim 3, wherein the feed port (6) is connected with the grounding plate (1) by adopting a cuboid metal block; a cylindrical groove is formed in the side face of the cuboid metal block, and the cylindrical groove is used for fixing the radio frequency coaxial connector; the cuboid metal block is 7mm long, 16mm wide and 18mm high, the diameter of the side surface of the cylindrical groove is 4.1mm, and the length is 7 mm; the feeding port adopts a 50 omega coaxial feeding interface.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010716894.XA CN111883892B (en) | 2020-07-23 | 2020-07-23 | Broadband liquid attenuator based on T-shaped resistance network |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010716894.XA CN111883892B (en) | 2020-07-23 | 2020-07-23 | Broadband liquid attenuator based on T-shaped resistance network |
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| CN111883892A CN111883892A (en) | 2020-11-03 |
| CN111883892B true CN111883892B (en) | 2021-05-25 |
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Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101950835A (en) * | 2010-08-31 | 2011-01-19 | 电子科技大学 | Liquid-type high-power microwave rectangular waveguide attenuator |
| CN108879052A (en) * | 2018-07-03 | 2018-11-23 | 安徽帮创智能科技有限公司 | A kind of liquid waveguide adjustable attenuator |
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2020
- 2020-07-23 CN CN202010716894.XA patent/CN111883892B/en active Active
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101950835A (en) * | 2010-08-31 | 2011-01-19 | 电子科技大学 | Liquid-type high-power microwave rectangular waveguide attenuator |
| CN108879052A (en) * | 2018-07-03 | 2018-11-23 | 安徽帮创智能科技有限公司 | A kind of liquid waveguide adjustable attenuator |
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| CN111883892A (en) | 2020-11-03 |
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