CN216531261U - Cascade broadband liquid attenuator - Google Patents
Cascade broadband liquid attenuator Download PDFInfo
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- CN216531261U CN216531261U CN202122912611.1U CN202122912611U CN216531261U CN 216531261 U CN216531261 U CN 216531261U CN 202122912611 U CN202122912611 U CN 202122912611U CN 216531261 U CN216531261 U CN 216531261U
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Abstract
The utility model relates to a cascade broadband liquid attenuator, which comprises a grounding plate, a liquid load, a gradual change transmission line, a parallel flat transmission line, a feed port, a container, a water inlet and a water outlet, wherein the grounding plate is arranged on the container; the feed port sets up the both ends of ground plate, and the feed port still passes through parallel dull and stereotyped transmission connection gradual change transmission line, and the water inlet sets up in the bottom of ground plate, and the delivery port sets up on the upper portion of container, and gradual change transmission line, parallel dull and stereotyped transmission line and container form the enclosure space, are equipped with the liquid load in the enclosure space, and the liquid load includes first liquid resistance, second liquid resistance and third liquid resistance, and the liquid load is symmetrical structure. The utility model adopts the cascaded T-shaped resistance attenuation circuit, has compact structure, can realize larger attenuation, and simultaneously adopts the liquid load design to radiate heat through liquid circulation, thereby prolonging the service life of the attenuator.
Description
Technical Field
The utility model relates to the technical field of microwaves, in particular to a cascade broadband liquid attenuator.
Background
In the modern digital television wireless transmitting equipment, specified precision measurement is required to be carried out on energy and information parameters of an output signal, the measurement is mainly characterized by a high-power dynamic range, and a power attenuator works on the principle that microwave energy is converted into heat energy and released. In order to sufficiently and rapidly radiate heat of the microwave attenuator, a resistive attenuation material with high heat radiation efficiency is generally adopted for design, the heat radiation path of the attenuator is limited, and the cost of the resistive attenuation material is relatively high and is not easy to obtain. To improve heat dissipation efficiency while maintaining high attenuation, liquid materials may be incorporated into the design of conventional attenuators.
In recent years, water has been widely used in the field of microwave devices, such as liquid antennas, liquid loads, liquid filters, metamaterials and the like, due to its unique characteristics of fluidity, transparency, strong absorption, reconfigurability and the like. Previous research has focused primarily on the reconfigurability and high dielectric constant characteristics of water, and attempts to avoid or reduce electromagnetic losses of water during design. However, the electromagnetic loss of water is a great advantage in designing the attenuator, and the mobility thereof can improve the power bearing capacity of the water load. However, the liquid attenuator using water in the prior art generally has the problems of small attenuation and complex structure, so that a filter with compact structure and large attenuation needs to be designed.
SUMMERY OF THE UTILITY MODEL
In order to solve the technical problem in the prior art, the utility model provides a cascade broadband liquid attenuator.
The utility model specifically comprises the following contents: a cascade broadband liquid attenuator comprises a grounding plate, a liquid load, a gradual change transmission line, a parallel flat transmission line, a feed port, a container, a water inlet and a water outlet;
the feed port is arranged at two ends of the grounding plate and is also connected with the gradual change transmission line through the parallel flat transmission line, the water inlet is arranged at the bottom of the grounding plate, the water outlet is arranged at the upper part of the container,
gradual change transmission line, parallel dull and stereotyped transmission line and container form the enclosure space, be equipped with liquid load in the enclosure space, liquid load includes first liquid resistance, second liquid resistance and third liquid resistance, first liquid resistance is the hexahedron shape, the second liquid resistance is the pentaprism shape, the third liquid resistance is the quadrangular prism shape, liquid load includes first liquid resistance from the left side in proper order, the second liquid resistance, third liquid resistance, the second liquid resistance, the third liquid resistance, the second liquid resistance, first liquid resistance, liquid load is symmetrical structure, the first liquid resistance that is located both ends connects gradual change transmission line respectively.
Further, the front view and the back view of the first liquid resistor are two equal trapezoids; the side surface of the first liquid resistor, which is in contact with the gradient transmission line, is in an isosceles triangle shape, and the side surface of the first liquid resistor, which is in contact with the second liquid resistor, is in a rectangle shape; the top and the bottom of the second liquid resistor are pentagonal; the second liquid resistor is contacted with the grounding plate to form a square shape; the top and the bottom of the third liquid resistor are isosceles trapezoids, and the rest four surfaces are rectangles.
Furthermore, the gradual change transmission line and the parallel flat transmission line both comprise a positive plate and a negative plate, and the negative plates of the gradual change transmission line and the parallel flat transmission line form a part of the grounding plate and are respectively arranged on two sides of the grounding plate.
Further, the resistance value of the first liquid resistor is 26 Ω, the resistance value of the second liquid resistor is 35 Ω, and the resistance value of the third liquid resistor is 52 Ω.
Furthermore, the length of the bottom edge of an isosceles triangle formed by the contact of the first liquid resistor and the gradual change transmission line is 14mm, the length of the waist is 77.3mm, the length of a rectangle in contact with the second liquid resistor is 34.7mm, and the width of the rectangle is 14 mm; the upper bottom and the lower bottom of the trapezoid forming the first liquid resistor are respectively 19.4mm and 82mm, and the waist lengths of the two sides are respectively 34.7mm and 77.3 mm.
Furthermore, the side lengths of the pentagons at the top and the bottom of the second liquid resistor are respectively 34.7mm, 8.5mm, 14mm and 8.5mm, and the side length of the square formed by contacting the grounding plate is 14 mm.
Furthermore, the upper bottom of the isosceles trapezoid at the top and the bottom of the third liquid resistor is 32.6mm, the lower bottom is 46.6mm, and the waist length is 34.7 mm.
Furthermore, the feed port is connected with the grounding plate by adopting a cuboid metal block, a cylindrical groove is cut on the side surface of the cuboid metal block, the diameter of the side surface is 4.1mm, the length of the side surface is 7mm, the length of the grounding plate is 330mm, the width of the grounding plate is 116mm, and the integral size of the attenuator is 330 multiplied by 120 multiplied by 50mm3。
Further, the length of the gradual change transmission line is 69.3mm, the maximum section width is 116mm, the height is 42.5mm, the minimum section width is 43.7mm, the height is 8.8mm, and the gradual change angle is 23 degrees; the length of the parallel flat transmission line is 21mm, the section width is 42.5mm, the height is 8.8mm, and the section impedance is 50 omega; the wall of the container is 2mm thick and its overall dimensions are 290mm long, 120mm wide and 50mm high.
The utility model adopts the cascaded T-shaped resistance attenuation circuit, has compact structure, can realize larger attenuation, and simultaneously adopts the liquid load design to dissipate heat through liquid circulation, thereby prolonging the service life of the attenuator.
Drawings
The following further explains embodiments of the present invention with reference to the drawings.
FIG. 1 is a perspective view of a cascade broadband liquid attenuator of the present invention;
fig. 2 is a schematic plan view of a grounding plate of the present invention;
FIG. 3 is a schematic diagram of the structure of a liquid load of the present invention;
FIG. 4 is a schematic view of a container of the present invention;
FIG. 5 is S of a cascade broadband liquid attenuator of the present invention11And (5) a curve simulation graph.
FIG. 6 is S of a cascaded broadband liquid attenuator of the present invention21And (5) a curve simulation graph.
Detailed Description
As shown in fig. 1, the present embodiment discloses a cascaded broadband liquid attenuator, which employs a multi-stage T-type resistor attenuation network, and includes a ground plate 1, a liquid load (a first liquid resistor 2, a second liquid resistor 3, and a third liquid resistor 4), a gradual change transmission line 5, a parallel flat transmission line 6, a feed port 7, a container 8, a water inlet 9, and a water outlet 10.
As shown in fig. 2, the ground plate 1 is a flat plate, and is composed of a tapered transmission line, a negative plate of a parallel flat transmission line, and a middle portion, wherein the middle portion is rectangular in a plan view, two ends of the rectangle are isosceles trapezoids, outer portions of the trapezoids at the two ends are rectangular, and finally the shape with a wide middle and narrow ends is formed. In this embodiment, the overall length of the grounding plate 1 is 330mm, the width thereof is 116mm, and a cylindrical groove is cut at the center of the grounding plate and communicated with the water inlet.
The feeding part of the attenuator is connected with the parallel flat transmission line through the coaxial probe, the left end and the right end of the grounding plate 1 are respectively connected with a feeding port 7, the feeding port 7 is respectively connected with the positive plate and the negative plate of the parallel flat transmission line 6, the feeding port is integrally a cuboid metal block, a cylindrical groove is cut on the side surface of the feeding port, the diameter of the cylindrical groove is 4.1mm, the length of the cylindrical groove is 7mm, and the cylindrical groove is used for fixing the coaxial probe.
The graded transmission line 5 and the parallel flat transmission line 6 are both composed of a positive plate and a negative plate. The parallel flat transmission line 6 is also used as a transition structure between the connection feed port 7 and the gradual change transmission line 5, the length of the line is 21mm, the width of the section of the transmission line is 42.5mm, the height of the transmission line is 8.8mm, and the section impedance of the transmission line is 50 omega, so that the connection with the coaxial probe is facilitated. The length of the gradual change transmission line 5 is 69.3mm, the maximum section width is 116mm, the height is 42.5mm, the minimum section width is 43.7mm, the height is 8.8mm, and the gradual change angle is 23 degrees, so that the impedance matching between the gradual change transmission line and the cascade T-shaped resistance attenuation network is favorably realized. In this embodiment, the grounding plate 1, the positive and negative plates of the transmission line are all cut from a metal plate with a thickness of 2mm, and the overall size of the attenuator is 330 × 120 × 50mm3(length × width × height).
As shown in fig. 3, the multi-stage T-type resistance attenuation network is formed by cascading three single-stage T-type resistance attenuation networks. The container 8 is a transparent irregular container, and the gradient transmission line 5, the parallel flat transmission line 6 and the container 8 form a closed space. And water outlets 10 are respectively arranged at the tops of the two gradual change transmission lines 5 and the corresponding positions of the container 8, the water outlets 10 are connected with the closed space, after liquid is injected into the closed space from the water inlet 9, redundant liquid flows out from the water outlets 10, the liquid is injected into the closed space to form communicated liquid loads, and the seven liquid loads are connected to form a multi-stage T-shaped resistance attenuation network.
The front and rear views of the first liquid resistance 2 are two equal trapezoids; the side surface of the first liquid resistor 2, which is in contact with the gradient transmission line, is in an isosceles triangle shape, and the side surface of the first liquid resistor, which is in contact with the second liquid resistor 3, is in a rectangle shape; the first second liquid resistor 3 is connected with the first liquid resistor 2 and the third liquid resistor 4 from the left side of the liquid attenuator, the second liquid resistor 3 is connected with two symmetrical third liquid resistors 4, and the third second liquid resistor 3 is connected with the third liquid resistor 4 and the first liquid resistor 2; the top and the bottom of the second liquid resistor 3 are pentagonal; the second liquid resistor 3 is contacted with the grounding plate 1 to form a square shape; the top and the bottom of the third liquid resistor 4 are isosceles trapezoids, and the other four surfaces are rectangles.
The length of the bottom edge of an isosceles triangle formed by the contact of the first liquid resistor 2 and the gradual change transmission line 5 is 14mm, the length of the waist is 77.3mm, the length of a rectangle in contact with the second liquid resistor 3 is 34.7mm, and the width of the rectangle is 14 mm; the upper bottom and the lower bottom of the trapezoid forming the first liquid resistor 2 are respectively 19.4mm and 82mm, and the waist lengths at two sides are respectively 34.7mm and 77.3 mm; the side lengths of the pentagons at the top and the bottom of the second liquid resistor 3 are respectively 34.7mm, 34.7mm, 8.5mm, 14mm and 8.5 mm; the side length of a square formed by the contact of the second liquid resistor 3 and the grounding plate 1 is 14 mm; the isosceles trapezoids at the top and bottom of the third liquid resistor 4 have an upper base of 32.6mm, a lower base of 46.6mm and a waist length of 34.7 mm.
In this embodiment, each single-stage attenuation network has 10dB of attenuation, and the corresponding resistance value of the first liquid resistor 2 is 26 Ω, the resistance value of the second liquid resistor 3 is 35 Ω, and the resistance value of the third liquid resistor 4 is 52 Ω. The load of the utility model is prepared by brine with the conductivity of 3.53S/m, and the first liquid resistor 2 is designed into a gradual change structure, so that the impedance is gradually changed in the gradual change transmission line 5, thereby reducing the port reflection.
As shown in FIG. 4, the container 8 is made of transparent resin, has a dielectric constant of about 3, has a wall thickness of 2mm, a length of 290mm, a width of 120mm and a height of 50mm, and has cylindrical grooves cut in its side surfaces and bottom for circulating the liquid.
The application effect of the present invention will be described in detail with reference to the simulation.
FIG. 5 shows the S of the simulation of the present invention11Versus frequency. It can be seen that the attenuator has S in the DC-2GHz frequency band11Typical values are less than-10 dB, which shows that the transmission line and the cascade T-shaped resistance attenuation network have good matching performance.
FIG. 6 shows the S of the simulation of the present invention21Versus frequency. As can be seen, the attenuation (S21) of the utility model in the DC-2GHz frequency band is 30dB, and S in the working frequency range21Has good flatness.
The cascade broadband liquid attenuator is based on a T-shaped attenuation network, and the attenuation of 30dB is realized by adopting a cascade mode and a liquid load, the working frequency of the cascade broadband liquid attenuator is DC-2GHz, and the fluctuation of an attenuation value in a working frequency band is not more than 3.8 dB. The liquid load is applied to the design of the attenuator, the attenuator has the characteristics of low cost, easiness in obtaining and the like, the circulating heat dissipation can be performed by fully utilizing the water mobility, and the service life of the attenuator is prolonged. Compared with the traditional waveguide attenuator, the liquid load attenuator is not limited by cut-off frequency, the working frequency can be started from direct current, and in addition, the size of the liquid load is reduced by adopting a cascading mode. Therefore, the attenuator has the characteristics of compact structure, high attenuation, high heat dissipation performance, wide frequency band and the like, and has a good application prospect in high-power microwave measurement.
In the previous description, numerous specific details were set forth in order to provide a thorough understanding of the present invention. The foregoing description is only a preferred embodiment of the utility model, which can be embodied in many different forms than described herein, and therefore the utility model is not limited to the specific embodiments disclosed above. And that those skilled in the art may, using the methods and techniques disclosed above, make numerous possible variations and modifications to the disclosed embodiments, or modify equivalents thereof, without departing from the scope of the claimed embodiments. Any simple modification, equivalent change and modification of the above embodiments according to the technical essence of the present invention are within the scope of the technical solution of the present invention.
Claims (9)
1. A cascaded broadband liquid attenuator, characterized by: the device comprises a grounding plate (1), a liquid load, a gradual change transmission line (5), a parallel flat transmission line (6), a feed port (7), a container (8), a water inlet (9) and a water outlet (10);
the feed port (7) is arranged at two ends of the grounding plate (1), the feed port (7) is also connected with the gradual change transmission line (5) through the parallel flat transmission line (6), the water inlet (9) is arranged at the bottom of the grounding plate (1), the water outlet (10) is arranged at the upper part of the container (8),
gradual change transmission line (5), dull and stereotyped transmission line (6) and container (8) form the enclosure space, be equipped with liquid load in the enclosure space, liquid load includes first liquid resistance (2), second liquid resistance (3) and third liquid resistance (4), first liquid resistance (2) are the hexahedron shape, second liquid resistance (3) are the pentaprism shape, third liquid resistance (4) are the quadrangular shape, liquid load includes first liquid resistance (2) from the left side in proper order, second liquid resistance (3), third liquid resistance (4), second liquid resistance (3), first liquid resistance (2), liquid load is symmetrical structure, the gradual change transmission line (5) is connected respectively in first liquid resistance (2) that are located both ends.
2. The cascade broadband liquid attenuator of claim 1, wherein: the front and rear views of the first liquid resistance (2) are two equal trapezoids; the side surface of the first liquid resistor (2) in contact with the gradual change transmission line (5) is in an isosceles triangle shape, and the side surface of the first liquid resistor in contact with the second liquid resistor (3) is in a rectangle shape; the top and the bottom of the second liquid resistor (3) are pentagonal; the second liquid resistor (3) is contacted with the grounding plate (1) to form a square shape; the top and the bottom of the third liquid resistor (4) are isosceles trapezoids, and the rest four surfaces are rectangles.
3. The cascade broadband liquid attenuator of claim 2, wherein: the gradual change transmission line (5) and the parallel flat plate transmission line (6) both comprise a positive plate and a negative plate, and the negative plates of the gradual change transmission line and the parallel flat plate transmission line form a part of the grounding plate and are respectively arranged on two sides of the grounding plate.
4. The cascade broadband liquid attenuator of claim 3, wherein: the resistance value of the first liquid resistor (2) is 26 omega, the resistance value of the second liquid resistor (3) is 35 omega, and the resistance value of the third liquid resistor (4) is 52 omega.
5. The cascade broadband liquid attenuator of claim 1, wherein: the length of the bottom edge of an isosceles triangle formed by the contact of the first liquid resistor (2) and the gradual change transmission line (5) is 14mm, the length of the waist is 77.3mm, the length of a rectangle contacted with the second liquid resistor (3) is 34.7mm, and the width is 14 mm; the upper bottom and the lower bottom of the trapezoid of the first liquid resistor (2) are respectively 19.4mm and 82mm, and the waist lengths of the two sides are respectively 34.7mm and 77.3 mm.
6. The cascade broadband liquid attenuator of claim 5, wherein: the side lengths of the pentagons at the top and the bottom of the second liquid resistor (3) are respectively 34.7mm, 8.5mm, 14mm and 8.5mm, and the side length of the square formed by contacting the grounding plate (1) is 14 mm.
7. The cascade broadband liquid attenuator of claim 6, wherein: the upper bottom of the isosceles trapezoid at the top and the bottom of the third liquid resistor (4) is 32.6mm, the lower bottom is 46.6mm, and the waist length is 34.7 mm.
8. The cascade broadband liquid attenuator of claim 1, wherein: the feed port (7) is connected with the grounding plate (1) by adopting a cuboid metal block, a cylindrical groove is cut on the side surface of the cuboid metal block, and the side surfaceThe diameter is 4.1mm, the length is 7mm, the length of the grounding plate (1) is 330mm, the width is 116mm, and the overall size of the attenuator is 330 multiplied by 120 multiplied by 50mm3。
9. The cascade broadband liquid attenuator of claim 8, wherein: the length of the gradual change transmission line (5) is 69.3mm, the maximum section width is 116mm, the height is 42.5mm, the minimum section width is 43.7mm, the height is 8.8mm, and the gradual change angle is 23 degrees; the length of the parallel flat transmission line (6) is 21mm, the section width is 42.5mm, the height is 8.8mm, and the section impedance is 50 omega; the container (8) has a wall thickness of 2mm and an overall dimension of 290mm in length, 120mm in width and 50mm in height.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122912611.1U CN216531261U (en) | 2021-11-25 | 2021-11-25 | Cascade broadband liquid attenuator |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122912611.1U CN216531261U (en) | 2021-11-25 | 2021-11-25 | Cascade broadband liquid attenuator |
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| Publication Number | Publication Date |
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| CN216531261U true CN216531261U (en) | 2022-05-13 |
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| CN202122912611.1U Active CN216531261U (en) | 2021-11-25 | 2021-11-25 | Cascade broadband liquid attenuator |
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| CN (1) | CN216531261U (en) |
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- 2021-11-25 CN CN202122912611.1U patent/CN216531261U/en active Active
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