CN117878556B - Reflection type waveguide adjustable attenuator - Google Patents
Reflection type waveguide adjustable attenuator Download PDFInfo
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Abstract
The invention discloses a reflective waveguide adjustable attenuator, comprising: the device comprises a first multi-branch 3dB coupler, a second multi-branch 3dB coupler, a first connecting waveguide, a second connecting waveguide, a first bent waveguide, a second bent waveguide, a third bent waveguide, a fourth bent waveguide, a first metal diaphragm, a second metal diaphragm, a gear conversion structure and a diaphragm adjusting knob. The adjustable continuous attenuation device has good echo performance while meeting the requirement of the adjustable continuous attenuation of the broadband in the W frequency band, and solves the problems that the traditional structure is difficult to realize the characteristics of broadband matching, adjustable attenuation, excellent attenuation flatness and good echo performance at the same time in the millimeter wave frequency band. The invention has the advantages of wide bandwidth, excellent flatness, good echo performance and simple structure, and has wide application prospect in millimeter wave and terahertz measurement systems.
Description
Technical Field
The invention relates to a reflective waveguide adjustable attenuator, and belongs to the technical field of attenuators.
Background
The attenuator is used as an electronic device for introducing a preset attenuation circuit in a specified frequency range, and is widely applied to various radio frequency and microwave circuits. The attenuator can adjust the signal in the circuit in the test to protect the normal operation of the instrument, and can also improve the impedance matching and buffer the change of the impedance.
Currently, adjustable attenuators applicable to high frequency bands are classified into absorption attenuators and reflection attenuators according to different operating modes. The absorption type attenuator generally attenuates an input signal by utilizing a microwave absorption sheet inserted into a transmission line, has the advantages of simple structure, convenient processing and good echo performance, but the attenuation value is increased along with the increase of frequency, the attenuation flatness is poor, and the power capacity of the absorption type attenuator is small, the adjustable attenuation range is small, and the test requirement of the current millimeter wave field is difficult to meet because the absorbed signal power can generate heat; the reflection type attenuator adopts the microwave reflector plate inserted into the transmission line to reflect signals to achieve the effect of attenuation, and has the advantages of large adjustable attenuation range and large power capacity compared with the absorption type attenuator, but the attenuation amount of the attenuator is poor in flatness, the echo performance is poor, the echo loss is rapidly deteriorated along with the change of the attenuation amount, and the signal quality is deteriorated.
Therefore, a person skilled in the art needs to solve the technical problems that the reflection type attenuator has poor attenuation flatness and poor echo performance in the adjustable attenuation range, and is difficult to apply to the millimeter wave field.
Disclosure of Invention
The purpose is as follows: in order to overcome the defects in the prior art, the invention provides the reflective waveguide adjustable attenuator which has the advantages of simple structure, excellent flatness, wide bandwidth and good echo performance.
The technical scheme is as follows: in order to solve the technical problems, the invention adopts the following technical scheme:
A reflective waveguide tunable attenuator comprising: the input port of the first multi-branch 3dB coupler is connected with one end of a first curved waveguide, the free end of the first curved waveguide is used as the input port of the reflective waveguide adjustable attenuator, the output port of the first multi-branch 3dB coupler is connected with the input end of the first connecting waveguide, the coupling port of the first multi-branch 3dB coupler is connected with the input end of the second connecting waveguide, the isolation port of the first multi-branch 3dB coupler is connected with one end of a third curved waveguide, a wave absorbing material is arranged in the third curved waveguide, and the wave absorbing material in the third curved waveguide is used as a matching load.
The output end of the first connecting waveguide is connected with the coupling port of the second multi-branch 3dB coupler, the output end of the second connecting waveguide is connected with the output port of the second multi-branch 3dB coupler, the isolation port of the second multi-branch 3dB coupler is connected with one end of a fourth curved waveguide, a wave absorbing material is arranged in the fourth curved waveguide, the wave absorbing material of the fourth curved waveguide is used as a matched load, the input port of the second multi-branch 3dB coupler is connected with one end of the second curved waveguide, and the free end of the second curved waveguide is used as the output port of the reflective waveguide adjustable attenuator.
The inner side surface of the first connecting waveguide is provided with a first through hole communicated with the internal waveguide, one end of the first metal diaphragm is inserted into the first through hole, the outer end face of the first metal diaphragm is connected with one end of the first connecting rod, and the rear end of the first connecting rod is connected with the first output end of the attenuation adjusting assembly.
The inside surface of the second connecting waveguide is provided with a second through hole communicated with the internal waveguide, one end of the second metal diaphragm is inserted into the second through hole, the outer end face of the second metal diaphragm is connected with one end of a second connecting rod, and the rear end of the second connecting rod is connected with a second output end of the attenuation adjusting assembly.
The attenuation amount adjusting assembly is used for enabling the first connecting rod to drive the first metal diaphragm to stretch in the first connecting waveguide, and the second connecting rod to drive the second metal diaphragm to stretch in the second connecting waveguide.
Preferably, the first through hole is disposed at a center position of an inner side surface of the first connection waveguide, and the second through hole is disposed at a center position of an inner side surface of the second connection waveguide.
Preferably, the first metal diaphragm is inserted into the first connecting waveguide to be adjusted between 0mm and 1.27mm, and the second metal diaphragm is inserted into the second connecting waveguide to be adjusted between 0mm and 1.27 mm.
As a preferable scheme, the first metal film sheet and the second metal film sheet are both arranged to be of a cube structure, and four edges of the side face of the cube structure are arranged to be round chamfer angles.
Preferably, the depth of the first metal film inserted into the first connection waveguide is smaller than the distance L1 between the outer side surface and the inner side surface inner wall of the first connection waveguide, and the depth of the second metal film inserted into the second connection waveguide is smaller than the distance L2 between the outer side surface and the inner side surface inner wall of the second connection waveguide.
Preferably, the height S1 of the first through hole is smaller than the distance N1 between the top surface and the bottom surface inner wall of the first connection waveguide, and the height S2 of the second through hole is smaller than the distance N2 between the top surface and the bottom surface inner wall of the second connection waveguide.
Preferably, the first multi-branch 3dB coupler and the second multi-branch 3dB coupler are both in a central symmetrical structure.
Preferably, the first multi-branch 3dB coupler and the second multi-branch 3dB coupler are both E-plane 3dB couplers.
Preferably, the first multi-branch 3dB coupler and the second multi-branch 3dB coupler each comprise six waveguide branches.
Preferably, the attenuation amount adjusting assembly includes: diaphragm adjust knob, gear conversion structure, the diaphragm adjust knob includes: the manual adjusting knob is used for adjusting the annular spiral ruler and simultaneously driving the first straight rack and the second straight rack to move up and down.
The gear conversion structure includes: the shell is internally provided with a first adjusting telescopic groove and a second adjusting telescopic groove, the first adjusting telescopic groove is movably connected with the third straight rack, and the second adjusting telescopic groove is movably connected with the fourth straight rack. The shell is also internally provided with a first conical straight-tooth gear set and a second conical straight-tooth gear set.
One end of the third straight rack is connected with the rear end of the first connecting rod, the other end of the third straight rack is meshed with the output end gear of the first conical straight rack gear set, and the input end gear of the first conical straight rack gear set is meshed with the first straight rack. The first connecting rod is used for driving the third straight rack to be connected with the first straight rack to horizontally stretch along with the upward and downward movement of the first straight rack.
One end of the fourth straight rack is connected with the rear end of the second connecting rod, the other end of the fourth straight rack is meshed with the output end gear of the second conical straight rack gear set, and the input end gear of the second conical straight rack gear set is meshed with the second straight rack. And the second connecting rod is used for driving the fourth straight rack to be connected with the second straight rack to horizontally stretch along with the upward and downward movement of the second straight rack.
The rotary motion of the pointer is corresponding to the up-and-down movement of the first straight rack and the second straight rack.
The beneficial effects are that: the reflection type waveguide adjustable attenuator provided by the invention has good echo performance while meeting the broadband adjustable continuous attenuation requirement under the W frequency band, and solves the problems that the traditional structure is difficult to realize broadband matching, the attenuation is adjustable, the attenuation flatness is excellent and the echo performance is good at the same time under the millimeter wave frequency band. The invention has the advantages of wide bandwidth, excellent flatness, good echo performance and simple structure, and has wide application prospect in millimeter wave and terahertz measurement systems.
Drawings
Fig. 1 is a schematic structural diagram of a reflective waveguide adjustable attenuator according to the present invention.
Fig. 2 is a schematic structural view of a first connecting waveguide.
Fig. 3 is a schematic structural diagram of the first metal film.
Fig. 4 is a schematic structural view of a second connecting waveguide.
Fig. 5 is a schematic structural diagram of the second metal film.
Fig. 6 is a schematic structural view of the attenuation adjusting assembly.
FIG. 7 is a simulation result of attenuation in an embodiment.
Fig. 8 is a simulation result of the attenuation of the conventional cubic metal diaphragm attenuator.
Fig. 9 is a schematic diagram of a multi-branch 3dB coupler structure.
Fig. 10 is a graph of simulation results for a multi-drop 3dB coupler.
FIG. 11 is a graph showing the simulation of the attenuation of two metal diaphragms of an embodiment at different insertion depths.
Fig. 12 is a graph showing the return loss simulation of two metal diaphragms of the embodiment at different insertion depths.
In the figure: 1. a first multi-drop 3dB coupler; 2. a first connection waveguide; 3. a second connecting waveguide; 4. a second multi-drop 3dB coupler; 5. a first metal diaphragm; 6. a second metal diaphragm; 7. a first curved waveguide; 8. a second curved waveguide; 9. a diaphragm adjustment knob; 10a gear conversion structure; 11. a third curved waveguide; 12. and a fourth curved waveguide.
Detailed Description
The following description of the embodiments of the present invention will be made more apparent and fully by reference to the accompanying drawings, in which embodiments of the invention are shown, and in which it is evident that the embodiments shown are only some, but not all embodiments of the invention. All other embodiments, which can be made by a person skilled in the art without any inventive effort, are intended to be within the scope of the present invention.
The invention will be further described with reference to specific examples.
Example 1:
As shown in fig. 1, this embodiment describes a reflective waveguide tunable attenuator, including: a first multi-branch 3dB coupler 1, a second multi-branch 3dB coupler 4, a first connecting waveguide 2, a second connecting waveguide 3, a first curved waveguide 7, a second curved waveguide 8, a third curved waveguide 11, a fourth curved waveguide 12, a first metal diaphragm 5, a second metal diaphragm 6, a gear conversion structure 10, and a diaphragm adjustment knob 9.
The input port of the first multi-branch 3dB coupler 1 is connected with one end of a first curved waveguide 7, the free end of the first curved waveguide 7 is used as the input port of a reflection type waveguide adjustable attenuator, the output port of the first multi-branch 3dB coupler 1 is connected with the input end of a first connecting waveguide 2, the coupling port of the first multi-branch 3dB coupler 1 is connected with the input end of a second connecting waveguide 3, the isolation port of the first multi-branch 3dB coupler 1 is connected with one end of a third curved waveguide 11, a wave absorbing material is arranged in the third curved waveguide 11, and the wave absorbing material in the third curved waveguide 11 is used as a matching load.
The output end of the first connecting waveguide 2 is connected with the coupling port of the second multi-branch 3dB coupler 4, the output end of the second connecting waveguide 3 is connected with the output port of the second multi-branch 3dB coupler 4, the isolation port of the second multi-branch 3dB coupler 4 is connected with one end of the fourth curved waveguide 12, the wave absorbing material is arranged in the fourth curved waveguide 12, the wave absorbing material of the fourth curved waveguide 12 is used as a matched load, the input port of the second multi-branch 3dB coupler 4 is connected with one end of the second curved waveguide 8, and the free end of the second curved waveguide 8 is used as the output port of the reflective waveguide adjustable attenuator.
As shown in fig. 2-3, a first through hole 202 for communicating with the internal waveguide is provided on the inner side surface 201 of the first connection waveguide 2, one end of the first metal film 5 is inserted into the first through hole, the outer end surface 501 of the first metal film 5 is connected with one end of a first connection rod, and the rear end of the first connection rod is connected with the first output end of the attenuation adjusting assembly.
As shown in fig. 4-5, a second through hole 302 for communicating with the internal waveguide is provided on the inner side surface 301 of the second connection waveguide 3, one end of the second metal diaphragm 6 is inserted into the second through hole, the outer end face 601 of the second metal diaphragm 6 is connected with one end of a second connection rod, and the rear end of the second connection rod is connected with the second output end of the attenuation adjusting assembly.
The attenuation adjusting assembly is used for enabling the first connecting rod to drive the first metal diaphragm 5 to stretch in the first connecting waveguide 2, and the second connecting rod to drive the second metal diaphragm 6 to stretch in the second connecting waveguide 3.
Preferably, the first through hole 202 is disposed at a center position of the inner side surface 201 of the first connecting waveguide 2, and the second through hole 302 is disposed at a center position of the inner side surface 301 of the second connecting waveguide 3.
Preferably, the depth of the first metal diaphragm 5 inserted into the first connecting waveguide 2 is adjusted between 0mm and 1.27mm, and the depth of the second metal diaphragm 6 inserted into the second connecting waveguide 3 is adjusted between 0mm and 1.27 mm.
As a preferred solution, the first metal film 5 and the second metal film 6 are both provided with a cube structure, and four edges of the side surface of the cube structure are provided with round chamfers for realizing flat attenuation characteristics.
Preferably, the depth of the first metal film 5 inserted into the first connection waveguide 2 is smaller than the distance L1 between the outer side surface and the inner side surface of the first connection waveguide 2, and the depth of the second metal film 6 inserted into the second connection waveguide 3 is smaller than the distance L2 between the outer side surface and the inner side surface of the second connection waveguide 3.
Preferably, the height S1 of the first through hole 202 is smaller than the distance N1 between the top surface and the bottom surface inner wall of the first connecting waveguide 2, and the height S2 of the second through hole 302 is smaller than the distance N2 between the top surface and the bottom surface inner wall of the second connecting waveguide 3.
Preferably, the first multi-branch 3dB coupler 1 and the second multi-branch 3dB coupler 4 are both in a central symmetrical structure.
Preferably, the first multi-branch 3dB coupler 1 and the second multi-branch 3dB coupler 4 are both E-plane 3dB couplers.
Preferably, the first multi-branch 3dB coupler 1 and the second multi-branch 3dB coupler 4 each comprise six waveguide branches.
Preferably, the wave absorbing material adopts a right triangle shape.
Preferably, as shown in fig. 6, the attenuation adjustment assembly includes: diaphragm adjust knob 9, gear conversion structure 10, diaphragm adjust knob 9 includes: the manual adjusting knob 901 is used for adjusting the annular screw rule 902, and the annular screw rule 902 and the first straight rack 903 and the second straight rack 904 simultaneously drive the first straight rack 903 and the second straight rack 904 to move up and down.
The gear conversion structure 10 includes: the casing is provided with first regulation expansion tank 1001, second regulation expansion tank 1002 in the casing, first regulation expansion tank 1001 is connected with the movement of third straight rack 1003, and second regulation expansion tank 1002 is connected with the movement of fourth straight rack 1004. A first conical spur gear set 1005 and a second conical spur gear set 1006 are also disposed in the housing.
One end of the third straight rack 1003 is connected with the rear end of the first connecting rod, the other end of the third straight rack 1003 is meshed with the output end gear of the first conical straight rack gear set 1005, and the input end gear of the first conical straight rack gear set 1005 is meshed with the first straight rack 903. The first connecting rod is used for driving the third straight rack to be connected with the first straight rack to horizontally stretch along with the upward and downward movement of the first straight rack.
One end of the fourth straight rack 1004 is connected to the rear end of the second connecting rod, the other end of the fourth straight rack 1004 is meshed with the output end gear of the second conical straight rack gear set 1006, and the input end gear of the second conical straight rack gear set 1006 is meshed with the second straight rack 904. And the second connecting rod is used for driving the fourth straight rack to be connected with the second straight rack to horizontally stretch along with the upward and downward movement of the second straight rack.
Preferably, the device further comprises an attenuation indicating dial 905, wherein a pointer of the attenuation indicating dial 905 is linked with the annular spiral ruler 902, and the rotation of the pointer corresponds to the up and down movement of the first straight rack 903 and the second straight rack 904.
Example 2:
In this embodiment, a W-band reflection type adjustable attenuator is taken as an example, and its working principle is as follows: the free end of the first curved waveguide 7 is used as an input port of the reflective waveguide adjustable attenuator, a microwave signal input from the input port is divided into two paths by the first multi-branch 3dB coupler to flow out from the coupling end and the output end respectively, the two paths of flowing-out signals are reflected by metal films in the first connecting waveguide 2 and the second connecting waveguide 3 respectively, and a part of signals are coupled by the second multi-branch 3dB coupler and then output to the free end of the second curved waveguide 8, namely the output port of the reflective waveguide adjustable attenuator.
In this embodiment, by adjusting the depth of the metal film extending into the waveguide cavity to be zero, that is, not deep into the waveguide cavity, and not exceeding the length of the narrow side of the rectangular waveguide (that is, the depth in the y direction), the shallower the depth of the metal film entering the waveguide cavity, the smaller the signal reflection, the smaller the attenuation value of the attenuator, the greater the depth of the metal film entering the waveguide cavity, the greater the corresponding reflection, and the greater the attenuation amount of the corresponding attenuator.
The attenuation amount adjusting assembly enables the annular spiral ruler to rotate and drive the first straight rack and the second straight rack to move downwards through adjusting the manual adjusting knob, the first conical straight rack gear set and the second conical straight rack gear set which are meshed drive the third straight rack to horizontally move in the first adjusting telescopic slot, and the fourth straight rack is horizontally moved in the second adjusting telescopic slot, so that the insertion depth of the metal membrane is changed simultaneously, and the effect of attenuation amount control is achieved through adjusting reflection echoes.
Example 3:
As shown in fig. 7, the metal film sheet S (2, 1) of the present embodiment has a circular chamfer with a radius of 0.2mm. dB (S (2, 1)) represents the attenuation of the metal diaphragm S (2, 1) with different insertion depths lris _h between 75GHz and 110 GHz. The insertion depth lris _h was 0.2mm,0.4mm,0.6mm,0.8mm,1mm,1.2mm, respectively.
As shown in fig. 8, the conventional rectangular parallelepiped metal film S (2, 2), dB (S (2, 2)) represents the attenuation of the metal film S (2, 2) with different insertion depths lris _w1 between 75GHz and 110 GHz. The insertion depth lris _w1 was 0.2mm,0.4mm,0.6mm,0.8mm,1mm,1.2mm, respectively.
Through comparison, when the insertion depth h of the metal diaphragm is greater than 1.0mm and the attenuation is greater than 10dB, the attenuation flatness of the traditional cuboid metal diaphragm structure is about 3dB, the attenuation flatness of the metal diaphragm of the round chamfer cube structure is about 0.6dB, and under the condition that the insertion depths are the same, the attenuation flatness of the waveguide adjustable attenuator can be better improved, and the test requirements of the attenuator under the conditions of wide frequency band and high flatness can be better met in millimeter wave and terahertz measurement systems.
It should be noted that the present embodiment is designed by taking the W frequency band as an example, and a technician can also adjust the radius, the height and the thickness of the rounded corner of the metal diaphragm according to the embodiment, so as to realize the adjustment of the attenuation under different frequency bands.
Example 4:
As shown in fig. 9, the multi-branch 3dB coupler of the present embodiment includes a main waveguide W1 and a sub-waveguide W2 disposed parallel to each other, and a first waveguide branch W3, a second waveguide branch W4, a third waveguide branch W5, a fourth waveguide branch W6, a fifth waveguide branch W7, and a sixth waveguide branch W8 disposed parallel between coupling surfaces of the main waveguide W1 and the sub-waveguide W2.
As shown in FIG. 10, the working bandwidth of the multi-branch 3dB coupler can cover 75GHz-110GHz, the standing wave ratio in the W frequency band is 1.22, the embodiment adopts a six-branch waveguide structure, wherein dB (W (1, 1)) represents the echo performance of the input port of the multi-branch 3dB coupler, dB (W (2, 1)) represents the transmission performance of the output port of the multi-branch 3dB coupler, and dB (W (3, 1)) represents the transmission performance of the coupling port of the multi-branch 3dB coupler, so that the working bandwidth of the six-branch waveguide structure is wide, the echo performance of the adjustable waveguide attenuator can be improved, and the test requirements of wide frequency band and good echo performance in millimeter wave and terahertz measurement systems are met.
It should be noted that the present embodiment is designed by taking the W frequency band as an example, and a technician can also adjust the width, length and number of waveguide branches according to the embodiment, so as to implement different operating bandwidths in other frequency bands.
Example 5:
Fig. 11 is an S21 attenuation simulation curve of the reflection type adjustable attenuator with the embodiment, and it can be seen from the graph that the reflection type adjustable attenuator with the reflection type adjustable attenuator has the advantage of high flatness when the insertion depth h is smaller than 1.26mm, and covers the whole W frequency band, which proves that the proposed invention can realize the attenuation requirements of broadband, adjustable attenuation and excellent flatness under the millimeter wave frequency band.
Fig. 12 is an S11 echo simulation curve of the reflection type adjustable attenuator of the present embodiment, and it can be seen from the graph that, in the 75GHz-110GHz frequency band, the echo loss of the reflection type adjustable attenuator of the present embodiment is not lower than 15dB in the adjustable attenuation, which illustrates that the present invention solves the problem that the echo rapidly deteriorates with the attenuation change of the conventional reflection type adjustable attenuator, and can realize the test requirements of wideband and good echo performance in millimeter wave and terahertz measurement systems.
It should be noted that the present embodiment is designed by taking the W frequency band as an example, and a skilled person can adjust the shape of the connecting waveguide according to the present embodiment, and implement the method in other frequency bands.
The foregoing is only a preferred embodiment of the invention, it being noted that: it will be apparent to those skilled in the art that various modifications and adaptations can be made without departing from the principles of the present invention, and such modifications and adaptations are intended to be comprehended within the scope of the invention.
Claims (10)
1. A reflective waveguide adjustable attenuator, characterized by: comprising the following steps: the input port of the first multi-branch 3dB coupler (1) is connected with one end of a first curved waveguide (7), the free end of the first curved waveguide (7) is used as the input port of the reflection type waveguide adjustable attenuator, the output port of the first multi-branch 3dB coupler (1) is connected with the input end of a first connecting waveguide (2), the coupling port of the first multi-branch 3dB coupler (1) is connected with the input end of a second connecting waveguide (3), the isolation port of the first multi-branch 3dB coupler (1) is connected with one end of a third curved waveguide (11), a wave absorbing material is arranged in the third curved waveguide (11), and the wave absorbing material in the third curved waveguide (11) is used as a matching load;
The output end of the first connecting waveguide (2) is connected with the coupling port of the second multi-branch 3dB coupler (4), the output end of the second connecting waveguide (3) is connected with the output port of the second multi-branch 3dB coupler (4), the isolation port of the second multi-branch 3dB coupler (4) is connected with one end of a fourth curved waveguide (12), a wave absorbing material is arranged in the fourth curved waveguide (12), the wave absorbing material of the fourth curved waveguide (12) is used as a matching load, the input port of the second multi-branch 3dB coupler (4) is connected with one end of a second curved waveguide (8), and the free end of the second curved waveguide (8) is used as the output port of the reflective waveguide adjustable attenuator;
A first through hole (202) for communicating the internal waveguide is formed in the inner side surface (201) of the first connecting waveguide (2), one end of the first metal diaphragm (5) is inserted into the first through hole, the outer end face (501) of the first metal diaphragm (5) is connected with one end of a first connecting rod, and the rear end of the first connecting rod is connected with a first output end of the attenuation adjusting assembly;
a second through hole (302) for communicating the internal waveguide is formed in the inner side surface (301) of the second connecting waveguide (3), one end of the second metal diaphragm (6) is inserted into the second through hole, the outer end face (601) of the second metal diaphragm (6) is connected with one end of a second connecting rod, and the rear end of the second connecting rod is connected with a second output end of the attenuation adjusting assembly;
the attenuation amount adjusting assembly is used for enabling the first connecting rod to drive the first metal diaphragm (5) to stretch in the first connecting waveguide (2), and the second connecting rod to drive the second metal diaphragm (6) to stretch in the second connecting waveguide (3).
2. A reflective waveguide tunable attenuator according to claim 1, wherein: the first through hole (202) is arranged at the center of the inner side surface (201) of the first connecting waveguide (2), and the second through hole (302) is arranged at the center of the inner side surface (301) of the second connecting waveguide (3).
3. A reflective waveguide tunable attenuator according to claim 1, wherein: the depth of the first metal diaphragm (5) inserted into the first connecting waveguide (2) is adjusted between 0mm and 1.27mm, and the depth of the second metal diaphragm (6) inserted into the second connecting waveguide (3) is adjusted between 0mm and 1.27 mm.
4. A reflective waveguide tunable attenuator according to claim 1, wherein: the first metal membrane (5) and the second metal membrane (6) are both arranged to be of a cube structure, and four edges of the side face of the cube structure are arranged to be round chamfer angles.
5. A reflective waveguide tunable attenuator according to claim 1, wherein: the depth of the first metal diaphragm (5) inserted into the first connecting waveguide (2) is smaller than the distance L1 between the outer side surface and the inner side surface inner wall of the first connecting waveguide (2), and the depth of the second metal diaphragm (6) inserted into the second connecting waveguide (3) is smaller than the distance L2 between the outer side surface and the inner side surface inner wall of the second connecting waveguide (3).
6. A reflective waveguide tunable attenuator according to claim 1, wherein: the height S1 of the first through hole (202) is smaller than the distance N1 between the top surface and the bottom surface inner wall of the first connecting waveguide (2), and the height S2 of the second through hole (302) is smaller than the distance N2 between the top surface and the bottom surface inner wall of the second connecting waveguide (3).
7. A reflective waveguide tunable attenuator according to claim 1, wherein: the first multi-branch 3dB coupler (1) and the second multi-branch 3dB coupler (4) are of central symmetry structures.
8. A reflective waveguide tunable attenuator according to claim 1, wherein: the first multi-branch 3dB coupler (1) and the second multi-branch 3dB coupler (4) are E-plane 3dB couplers.
9. A reflective waveguide tunable attenuator according to claim 1, wherein: the first multi-branch 3dB coupler (1) and the second multi-branch 3dB coupler (4) comprise six waveguide branches.
10. A reflective waveguide tunable attenuator according to claim 1, wherein: the delta attenuation adjustment assembly includes: diaphragm adjust knob (9), gear conversion structure (10), diaphragm adjust knob (9) include: the automatic transmission device comprises a manual adjusting knob (901), an annular screw rule (902), a first straight rack (903) and a second straight rack (904), wherein the manual adjusting knob (901) is adjusted to drive the annular screw rule (902) to rotate, and the rotating annular screw rule (902) simultaneously drives the first straight rack (903) and the second straight rack (904) to move up and down;
The gear change structure (10) includes: the shell is internally provided with a first adjusting telescopic groove (1001) and a second adjusting telescopic groove (1002), the first adjusting telescopic groove (1001) is movably connected with a third straight rack (1003), and the second adjusting telescopic groove (1002) is movably connected with a fourth straight rack (1004); a first conical straight-tooth gear set (1005) and a second conical straight-tooth gear set (1006) are also arranged in the shell;
One end of the third straight rack (1003) is connected with the rear end of the first connecting rod, the other end of the third straight rack (1003) is meshed with an output end gear of the first conical straight gear set (1005), and an input end gear of the first conical straight gear set (1005) is meshed with the first straight rack (903); the first connecting rod is used for driving the third straight rack to be connected with the first straight rack to horizontally stretch along with the upward and downward movement of the first straight rack;
One end of the fourth straight rack (1004) is connected with the rear end of the second connecting rod, the other end of the fourth straight rack (1004) is meshed with an output end gear of the second conical straight gear set (1006), and an input end gear of the second conical straight gear set (1006) is meshed with the second straight rack (904); and the second connecting rod is used for driving the fourth straight rack to be connected with the second straight rack to horizontally stretch along with the upward and downward movement of the second straight rack.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202410270404.6A CN117878556B (en) | 2024-03-11 | 2024-03-11 | Reflection type waveguide adjustable attenuator |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202410270404.6A CN117878556B (en) | 2024-03-11 | 2024-03-11 | Reflection type waveguide adjustable attenuator |
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| CN117878556A CN117878556A (en) | 2024-04-12 |
| CN117878556B true CN117878556B (en) | 2024-05-24 |
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| CN202410270404.6A Active CN117878556B (en) | 2024-03-11 | 2024-03-11 | Reflection type waveguide adjustable attenuator |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB692591A (en) * | 1950-12-21 | 1953-06-10 | British Thomson Houston Co Ltd | Wave guide attenuator |
| JP2006128810A (en) * | 2004-10-26 | 2006-05-18 | Kyocera Corp | Attenuator and high frequency transmitter-receiver using the same, radar apparatus, radar apparatus mounter vehicle, and radar apparatus mounter small ship |
| CN204947048U (en) * | 2015-08-24 | 2016-01-06 | 江苏贝孚德通讯科技股份有限公司 | A kind of novel waveguide attenuator |
| CN116826336A (en) * | 2023-06-15 | 2023-09-29 | 中电科思仪科技股份有限公司 | Miniaturized large-range high-precision adjustable attenuator and working method thereof |
| CN116865697A (en) * | 2023-05-31 | 2023-10-10 | 西安空间无线电技术研究所 | Ku frequency band broadband multiport power amplifier |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20220407200A1 (en) * | 2021-06-22 | 2022-12-22 | California Institute Of Technology | Waveguide based submillimmeter-wave and terahertz variable attenuator |
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Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB692591A (en) * | 1950-12-21 | 1953-06-10 | British Thomson Houston Co Ltd | Wave guide attenuator |
| JP2006128810A (en) * | 2004-10-26 | 2006-05-18 | Kyocera Corp | Attenuator and high frequency transmitter-receiver using the same, radar apparatus, radar apparatus mounter vehicle, and radar apparatus mounter small ship |
| CN204947048U (en) * | 2015-08-24 | 2016-01-06 | 江苏贝孚德通讯科技股份有限公司 | A kind of novel waveguide attenuator |
| CN116865697A (en) * | 2023-05-31 | 2023-10-10 | 西安空间无线电技术研究所 | Ku frequency band broadband multiport power amplifier |
| CN116826336A (en) * | 2023-06-15 | 2023-09-29 | 中电科思仪科技股份有限公司 | Miniaturized large-range high-precision adjustable attenuator and working method thereof |
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| CN117878556A (en) | 2024-04-12 |
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