A Ka-band waveguide three-way power divider

Abstract

The application discloses a Ka-band waveguide three-way power divider, and belongs to the technical field of microwave and millimeter wave, wherein a shielding box is provided with a combining port on the front side wall and three distribution ports on the rear side wall; the shielding box is provided with a co-planar magic T power divider, a co-planar magic T power combiner, a branch waveguide unequal power divider, an L-shaped waveguide, a Z-shaped waveguide and a half-waveguide-full-waveguide gradual change structure. The co-planar magic T power divider comprises an E-T junction waveguide cavity, two equal branch waveguide cavities, a microstrip probe and a power resistance load, and outputs two-way signals with equal amplitude and opposite phase; the branch waveguide unequal power divider comprises a four-branch waveguide directional coupler and a slanted wedge-shaped waveguide matching load, and the power ratio of the through output port to the coupling output port is 2:1. The application has the characteristics of symmetrical structure, good amplitude and phase consistency, small insertion loss, good port standing wave and high isolation.

Description

TECHNICAL FIELD

[0001] The application relates to a Ka-band waveguide three-way power divider, and belongs to the technical field of microwaves and millimeter waves, and is particularly suitable for being applied to a Ka-band solid-state power amplifier of a satellite communication microwave channel. BACKGROUND

[0002] At present, the maximum output power of a domestic Ka-band gallium nitride power amplifier chip is 20W (operated in a continuous wave mode), and in order to obtain greater power output, power synthesis must be performed on multiple chips. Traditional power synthesis is mainly implemented in a multi-stage binary (2 n ) power synthesis mode, and in actual engineering applications, the binary power synthesis mode has the following disadvantages: the output power of two-way (2 1 ) synthesis is insufficient; the output power of four-way (2 2 ) synthesis has a large margin, but the number of chips is doubled, leading to greater power consumption and higher overall cost.

[0003] In view of the above problems, domestic and foreign scholars have carried out research on waveguide three-way power dividers. In July 2012, Cai Bo published an article entitled “Design of a Ka-band waveguide three-way power divider” in the journal “Telemetry and Remote Control”, and proposed a Ka-band three-way equal power divider, which includes four waveguide T junctions, the first T junction is an equal power divider, the second and third T junctions are unequal power dividers, and the fourth T junction is an equal power combiner. In August 2012, Cai Bo applied for an invention patent “Waveguide three-way equal power divider / combiner”, with the application publication number CN102820509A. In October 2017, Zhao Qing and others applied for an invention patent “BJ320 one-to-three waveguide power divider”, with the authorization publication number CN207265208U, and disclosed a Ka-band (33.5GHz-36.5GHz) one-to-three waveguide power divider, which has a structure similar to that proposed by Cai Bo. In October 2022, Huang Xuelong and others published an article entitled “Development of a Ku-band 120W miniaturized power amplifier module” in the journal “Journal of Changchun Normal University”, and applied the structure proposed by Cai Bo to Ku-band six-way power synthesis after slight modification, and used six 30W gallium nitride power amplifier chips to perform power synthesis, with an output power of about 120W-131W and a synthesis efficiency of only 66.7%-72.8%. The waveguide three-way power dividers proposed in the above papers and patents use waveguide T junctions as three-port lossless devices, and therefore the overall structure has the following shortcomings: the isolation between the three output ports is poor, with an isolation degree of less than 10dB; and the standing wave ratio of the middle output port is very poor, with a return loss of only about 3dB, which means that when used as a combiner, half of the power of the power amplifier module connected to the middle port will be reflected, leading to low power synthesis efficiency of the overall machine and affecting the long-term reliability of the equipment. SUMMARY

[0004] In order to overcome the above-mentioned deficiencies of the prior art, the present application provides a Ka-band waveguide three-way power divider, which has the characteristics of good amplitude and phase consistency, small insertion loss, good port standing wave, and high isolation.

[0005] In order to achieve the above-mentioned purpose, the technical scheme adopted by the present application is as follows:

[0006] A Ka-band waveguide three-way power divider, comprising a shielding box, the shielding box is divided into an upper box body and a lower box body, and a cavity is arranged in the shielding box; a combining port is arranged on the front side wall of the shielding box, and three distribution ports are arranged on the rear side wall; a co-planar magic T power divider, a co-planar magic T power combiner, a branch waveguide unequal power divider, an L-shaped waveguide, a Z-shaped waveguide, and a half-waveguide-full-waveguide gradual structure are arranged in the shielding box.

[0007] The branch waveguide unequal power divider is provided with two and is symmetrically arranged; each branch waveguide unequal power divider comprises a four-branch waveguide directional coupler and an inclined wedge-shaped waveguide matching load.

[0008] The input port of the four-branch waveguide directional coupler is connected through an L-shaped waveguide a, and then connected with an output port of the co-planar magic T power divider through a half-waveguide-full-waveguide gradual structure a.

[0009] The through output port of the four-branch waveguide directional coupler is connected with a distribution port on the rear side wall of the shielding box through a Z-shaped waveguide.

[0010] The coupling output port of the four-branch waveguide directional coupler is connected with an L-shaped waveguide b, and then connected with an input port of the co-planar magic T power combiner through a half-waveguide-full-waveguide gradual structure b.

[0011] The isolation output port of the four-branch waveguide directional coupler is connected with the corresponding inclined wedge-shaped waveguide matching load.

[0012] A four-seam coupling array is arranged between the input port and the coupling output port of the four-branch waveguide directional coupler.

[0013] Further, the co-planar magic T power divider and the co-planar magic T power combiner each comprise an E-T junction waveguide cavity, two equal-branch waveguide cavities, and a microstrip probe, wherein one end of the microstrip probe is inserted into the E-T junction waveguide cavity, and the other end is connected with a power resistance load; the connection between the equal-branch waveguide cavity and the E-T junction waveguide cavity is a half-size rectangular waveguide port, and the end port of the equal-branch waveguide cavity is connected with a half-waveguide-full-waveguide gradual structure.

[0014] Further, the L-shaped waveguide is two standard straight waveguides that are vertically intersected, and the corner at the intersection of the waveguides is 45° beveled.

[0015] Further, the Z-shaped waveguide is three standard straight waveguides which are vertically intersected in sequence, and the corners at the intersection of the waveguides are all chamfered by 45 degrees; one end of the Z-shaped waveguide is connected with a straight-through output port of the branch waveguide unequal power divider, and the other end is connected with one distribution port of the shielding box; by adjusting the length of the horizontal waveguide of the Z-shaped waveguide, it can be ensured that the three distribution ports of the shielding box output equal-amplitude and in-phase signals.

[0016] Further, the half-waveguide-full-waveguide gradual change structure is a square horn shape, and the structure change from a half-size waveguide to a full-size waveguide is realized.

[0017] Further, the power resistance load is a gallium nitride power resistance load suitable for the Ka frequency band, and can withstand 30W continuous wave power; the power resistance load is welded in the groove of the lower box body through gold-tin eutectic welding, and the end of the microstrip probe and the power resistance load are connected through a gold strip or multiple gold wires.

[0018] Further, the microstrip probe is placed on an RT / duroid 5880 dielectric plate with a thickness of 0.254mm, and the copper layer has a thickness of 18μm; the dielectric plate is adhered to the lower box body through conductive adhesive.

[0019] Further, the oblique wedge-shaped waveguide matching load is made of silicon carbide material; the silicon carbide material is adhered to the inner wall of the waveguide through GD414 silicone rubber; and the oblique wedge-shaped waveguide matching load can withstand 20W continuous wave power.

[0020] Further, the shielding box is made of brass and plated with gold; the microstrip probe and the power resistance load are located in the lower box body, and the upper box body is provided with corresponding cavity structures; the oblique wedge-shaped waveguide matching load is located in the waveguide cavity formed by the upper box body and the lower box body and is fixed through silicone rubber; the upper box body is provided with multiple counterbores, the lower box body is provided with corresponding threaded holes, and the upper box body and the lower box body are fixed through screws passing through the counterbores and the threaded holes, thereby forming the shielding box.

[0021] Compared with the prior art, the present application has the following advantages:

[0022] 1. The present application proposes a waveguide three-way power divider in the Ka frequency band (29GHz-31GHz), which equally divides the input signal in the Ka frequency band into three equal-amplitude and in-phase signals; the present application has the characteristics of structural symmetry, good amplitude and phase consistency, small insertion loss, good port standing wave, and high isolation, and solves the problems of low output port isolation and poor standing wave ratio of the existing waveguide three-way power divider.

[0023] 2. The application is applied reversely, namely a Ka-band waveguide three-way power combiner. In the case of ensuring good heat dissipation of the shield box, the power resistor load can withstand 30W continuous wave power, and the rhombic waveguide matching load can withstand 20W continuous wave power, and the application can meet the needs of larger power combination.

[0024] 3. The application solves the shortcomings of the binary (2 n ) power combination mode. The application can realize six-way, nine-way, twelve-way, etc. non-binary power combination by combining and cascading with the traditional binary waveguide power distribution / combiner, that is, the number of power amplifier chips can be reasonably selected, which is conducive to improving the performance-price ratio of the power amplifier and reducing the cost of the whole machine. The application is particularly suitable for application in Ka-band solid-state power amplifiers, and has high popularization and application value. BRIEF DESCRIPTION OF DRAWINGS

[0025] Figure 1 is a schematic diagram of the external structure of the application;

[0026] Figure 2 is an exploded schematic diagram of the upper and lower box body structures of the application;

[0027] Figure 3 is a top view schematic diagram of the lower box body of the application;

[0028] Figure 4 is a bottom view schematic diagram of the upper box body of the application;

[0029] Figure 5 is a top view schematic diagram of the coplanar magic T equal power divider of the application;

[0030] Figure 6 is a top view schematic diagram of the branch waveguide unequal power divider of the application;

[0031] Figure 7 is an amplitude curve diagram of the output port II and port III of the application;

[0032] Figure 8 is a phase curve diagram of the output port II and port III of the application;

[0033] Figure 9 is an isolation degree curve diagram of the output port of the application;

[0034] Figure 10 is an input and output port return loss curve diagram of the application.

[0035] The combining port of the shield box is port I, and the three distribution ports are port III, port II and port IV from left to right, wherein the structures of port III and port IV are symmetrical, and the curves coincide, so Figures 7-10The curve of port IV is not presented in the figure, and reference can be made to the curve of port III. DETAILED DESCRIPTION

[0036] In order to help the skilled in the art to understand the technical content of the present application, the content of the present application is further described below in combination with the drawings.

[0037] Reference Figures 1-6 The present application is a Ka-band waveguide three-way power divider, which comprises a shielded box, the shielded box is divided into an upper box body 1 and a lower box body 2, and a cavity is arranged in the shielded box; a combining port is arranged on the front side wall of the shielded box, and three distribution ports are arranged on the rear side wall of the shielded box; a co-planar magic T power divider 3, a co-planar magic T power combiner 4, a branch waveguide unequal power divider 5, an “L”-shaped waveguide 6, a “Z”-shaped waveguide 7 and a half-waveguide-full-waveguide gradual change structure 8 are arranged in the shielded box.

[0038] The Ka-band waveguide three-way power divider is a left-right symmetrical structure; the combining port of the front side wall of the shielded box is connected with the input port of the co-planar magic T power divider 3; the two output ports of the co-planar magic T power divider 3 are connected with the half-waveguide-full-waveguide gradual change structure 8 respectively, then pass through the “L”-shaped waveguide 6 and are connected with the input ports of the two branch waveguide unequal power dividers 5 respectively; the through output port of the branch waveguide unequal power divider 5 in the left region passes through the “Z”-shaped waveguide 7 and is connected with the leftmost distribution port on the rear side wall of the shielded box; the through port of the branch waveguide unequal power divider 5 in the right region passes through the “Z”-shaped waveguide 7 and is connected with the rightmost distribution port on the rear side wall of the shielded box; the coupled output ports of the two branch waveguide unequal power dividers 5 pass through the “L”-shaped waveguide 6 respectively, are connected with the half-waveguide-full-waveguide gradual change structure 8 and then are connected with the two input ports of the co-planar magic T power combiner 4 respectively; the isolation ports of the two branch waveguide unequal power dividers 5 are connected with the oblique split waveguide matching loads 9 respectively; the output port of the co-planar magic T power combiner 4 is connected with the middle distribution port on the rear side wall of the shielded box.

[0039] Further, the co-planar magic T power divider 3 comprises an E-T junction waveguide cavity 10 and two equal branch waveguide cavities 11, and further comprises a microstrip probe 12, one end of the microstrip probe 12 is inserted into the E-T junction waveguide cavity 10 and the other end is connected with a power resistance load 13; the connection position between the equal branch waveguide cavity 11 and the E-T junction waveguide cavity 10 is a half-size rectangular waveguide port (7.12 mm x 1.78 mm), and the end port of the equal branch waveguide cavity 11 is connected with the half-waveguide-full-waveguide gradual change structure 8. The co-planar magic T power divider 3 functions to divide one input signal into two equal-amplitude and opposite-phase output signals. The co-planar magic T power combiner 4 is a reverse application of the co-planar magic T power divider 3, and functions to combine two equal-amplitude and opposite-phase input signals into one output signal.

[0040] Specifically, the microstrip probe 12 is placed on a RT / duroid 5880 dielectric plate with a thickness of 0.254 mm and a copper layer thickness of 18 μm; the dielectric plate is adhered to the lower box body 2 by conductive adhesive. The power resistor load 13 is a gallium nitride power resistor load suitable for the Ka frequency band, which can withstand 30 W continuous wave power; the power resistor load 13 is soldered in the groove of the lower box body 2 by gold-tin eutectic welding, and the end of the microstrip probe 12 and the power resistor load 13 are connected by a gold strip or multiple gold wires.

[0041] Further, the branch waveguide unequal power divider 5 includes a four-branch waveguide directional coupler 14 and a skew trowel-shaped waveguide matching load 9; the input port of the four-branch waveguide directional coupler 14 is connected with the "L" shaped waveguide 6; the straight-through output port is connected with a distribution port of the rear side wall of the shielded box after passing through the "Z" shaped waveguide 7; the coupled output port is connected with the "L" shaped waveguide 6, passes through the half-waveguide-full-waveguide gradual change structure 8, and is finally connected with an input port of the co-planar magic T equal power combiner 4; the isolation output port is connected with the skew trowel-shaped waveguide matching load 9; a four-slit coupling array is arranged between the input port and the coupled output port, the longitudinal dimensions of the four slits are 0.86 mm, 1.5 mm, 1.5 mm and 0.86 mm from bottom to top, the longitudinal dimensions of the three rectangular columns are 2.4 mm, 1.76 mm and 2.4 mm from bottom to top, and the transverse lengths of the slits and the rectangular columns are both 2.6 mm. The branch waveguide unequal power divider 5 functions to perform unequal power distribution on the input signal, the straight-through output port outputs two-thirds of the total power, and the coupled output port outputs one-third of the total power, that is, the output power ratio of the straight-through output port to the coupled output port is 2:1.

[0042] Specifically, the skew trowel-shaped waveguide matching load 9 is made of silicon carbide material and has a total length of 14.5 mm; the silicon carbide material is adhered to the inner wall of the waveguide by GD414 silicone rubber, absorbs microwave energy to convert it into heat, and transfers the heat to the shielded box by heat conduction; the skew trowel-shaped waveguide matching load 9 can withstand 20 W continuous wave power.

[0043] Further, the "L" shaped waveguide 6 is two standard straight waveguides that intersect perpendicularly, the corner at the intersection of the waveguides is beveled at 45°, and the transverse and longitudinal inscribed dimensions are both 2.87 mm, which can ensure that the "L" shaped waveguide 6 has the smallest insertion loss and the optimal return loss.

[0044] Further, the Z-shaped waveguide 7 is three standard straight waveguides which are vertically intersected in turn and has a shape similar to Z-shaped; the corners of the waveguide intersection are all chamfered by 45°, and the transverse and longitudinal inscribed sizes are both 2.87 mm, so as to ensure that the Z-shaped waveguide 7 has minimum insertion loss and optimal return loss; one end of the Z-shaped waveguide 7 is connected with the straight-through output port of the branch waveguide unequal power divider 5, and the other end is connected with one distribution port of the shield box; by adjusting the horizontal waveguide length of the Z-shaped waveguide 7, it can be ensured that the three distribution ports of the shield box output equal-amplitude and in-phase signals. In the embodiment, the distance between the longitudinal center line of the middle distribution port and the longitudinal center line of the branch waveguide unequal power divider 5 is 18 mm, and by adjusting the horizontal waveguide length of the Z-shaped waveguide 7, when the distance between the longitudinal center line of the right side area branch waveguide unequal power divider 5 and the center line of the right side distribution port is 22.22 mm, it can be ensured that the three distribution ports of the shield box output equal-amplitude and in-phase signals.

[0045] Further, the half-waveguide-full-waveguide gradual change structure 8 is square horn-shaped, and realizes the structure transformation from a half-size waveguide (7.12 mm*1.78 mm) to a full-size waveguide (7.12 mm*3.56 mm); by software optimization, the length of the half-waveguide-full-waveguide gradual change structure 8 is 7.5 mm, and the half-waveguide-full-waveguide gradual change structure 8 has the characteristics of small insertion loss and optimal return loss.

[0046] Further, the shield box is made of brass and has a gold-plated surface; the shield box is composed of an upper box body 1 and a lower box body 2 which are buckled together, the microstrip probe 12 and the power resistance load 13 are located on the lower box body 2, and the upper box body 1 is provided with a corresponding cavity structure; the miter-shaped waveguide matching load 9 is located in the waveguide cavity formed by the upper box body 1 and the lower box body 2 and is fixed by silicone rubber; the upper box body 1 is provided with a plurality of counterbores, the lower box body 2 is provided with corresponding threaded holes, and the upper box body 1 and the lower box body 2 are fixed by screws passing through the counterbores and the threaded holes, thereby forming the shield box.

[0047] Further, the combining port and the distribution port are both standard WR28 waveguide ports, and the waveguide port size is 7.12 mm*3.56 mm.

[0048] Figures 7-9 respectively are the amplitude curve diagram, the phase curve diagram and the isolation curve diagram of the output port of the application, Figure 10 is the return loss curve diagram of the input and output ports. As shown in the figure, in the Ka frequency band (29 GHz-31 GHz) range, the amplitude difference of the three output ports of the application is within 0.1 dB; the phase difference is within 6.1°; the isolation between port II and port III, and between port II and port IV is better than 23 dB, and the isolation between port III and port IV is better than 29 dB; the return loss of the input and output ports is better than 22 dB.

[0049] The conversion relationship between the return loss (RL) and the VSWR is shown in equation (1).

[0050]

[0051] According to the calculation of equation (1), the return loss of 22dB corresponds to the VSWR of 1.17.

[0052] In summary, the present application has the characteristics of symmetrical structure, good amplitude and phase consistency, small insertion loss, good port VSWR and high isolation, which solves the problems of low isolation and poor VSWR of the existing waveguide three-way power divider.

[0053] The present application proposes a Ka-band waveguide three-way power divider, and the brief working principle is as follows:

[0054] A Ka-band signal with power P is input from the combining port of the front side wall of the shielding box, and the combining port is connected with the input port of the co-planar magic T equal power divider 3; the co-planar magic T equal power divider 3 divides the Ka-band input signal into two equal-amplitude and opposite-phase output signals; after passing through the half-waveguide-full-waveguide gradual change structure 8 and the “L”-shaped waveguide 6, the two signals become two equal-amplitude and in-phase signals, i.e. the power of each signal is P / 2, and the two signals enter two branch waveguide unequal power dividers 5 respectively; the branch waveguide unequal power dividers 5 perform unequal power division on the P / 2 signals, and the output power ratio of the straight-through output port to the coupled output port is 2:1, i.e. the output power of the straight-through output port is P / 3, and the output power of the coupled output port is P / 6; the signals of the coupled output ports of the two branch waveguide unequal power dividers 5 are two equal-amplitude and in-phase signals, which become two equal-amplitude and opposite-phase signals after passing through the “L”-shaped waveguide 6 and the half-waveguide-full-waveguide gradual change structure 8, and the power of each signal is P / 6; the two equal-amplitude and opposite-phase signals pass through the co-planar magic T equal power combiner 4 and are combined into one signal with an output power of P / 3; at the same time, the horizontal direction waveguide length of the “Z”-shaped waveguide 7 is adjusted to make the phases of the signals output from the three distribution ports of the rear side wall of the shielding box consistent. As can be seen from the above, the Ka-band waveguide three-way power divider outputs three equal-amplitude and in-phase signals from the three distribution ports.

[0055] Those skilled in the art will appreciate that the embodiments described are for the purpose of helping the reader to understand the principles of the present application and should be understood as not limiting the scope of protection of the present application to the embodiments described. The present application can have various modifications and changes for those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the present application should be included in the scope of protection of the claims of the present application.

Claims

1. A Ka-band waveguide three-way power divider comprising a shielded box, characterized in that: The shielding box is divided into an upper box body and a lower box body, and a cavity is arranged in the shielding box; a combining port is arranged on the front side wall of the shielding box, and three distribution ports are arranged on the rear side wall; a coplanar magic T power divider, a coplanar magic T power combiner, branch waveguide unequal power dividers, L-shaped waveguides, Z-shaped waveguides and half-waveguide-full-waveguide gradual change structures are arranged in the shielding box. The two branch waveguide unequal power dividers are symmetrically arranged; each branch waveguide unequal power divider comprises a four-branch waveguide directional coupler and an oblique wedge-shaped waveguide matching load. The input port of the four-branch waveguide directional coupler is connected with the L-shaped waveguide a, and then connected with an output port of the coplanar magic T power divider through the half-waveguide-full-waveguide gradual change structure a. The through output port of the four-branch waveguide directional coupler is connected with one distribution port on the rear side wall of the shielding box through the Z-shaped waveguide. The coupling output port of the four-branch waveguide directional coupler is connected with the L-shaped waveguide b, and then connected with an input port of the coplanar magic T power combiner through the half-waveguide-full-waveguide gradual change structure b. The isolation output port of the four-branch waveguide directional coupler is connected with the corresponding oblique wedge-shaped waveguide matching load. A four-seam coupling array is arranged between the input port and the coupling output port of the four-branch waveguide directional coupler.

2. The Ka-band waveguide three-way power divider of claim 1, wherein, The coplanar magic T power divider and the coplanar magic T power combiner each comprise an E-T junction waveguide cavity, two equal-branch waveguide cavities and a microstrip probe, wherein one end of the microstrip probe is inserted into the E-T junction waveguide cavity, and the other end is connected with a power resistor load; the connection between the equal-branch waveguide cavity and the E-T junction waveguide cavity is a half-size rectangular waveguide port, and the end port of the equal-branch waveguide cavity is connected with a half-waveguide-full-waveguide gradual change structure.

3. The Ka-band waveguide three-way power divider of claim 1, wherein, The L-shaped waveguide is composed of two standard straight waveguides which are vertically intersected, and the corners of the waveguide intersection are 45° beveled.

4. The Ka-band waveguide three-way power divider of claim 1, wherein, The Z-shaped waveguide is composed of three standard straight waveguides which are vertically intersected in sequence, and the corners of the waveguide intersection are 45° beveled; one end of the Z-shaped waveguide is connected with the through output port of the branch waveguide unequal power divider, and the other end is connected with one distribution port of the shielding box; by adjusting the horizontal waveguide length of the Z-shaped waveguide, the equal-amplitude and in-phase signals output from the three distribution ports of the shielding box can be ensured.

5. The Ka-band waveguide three-way power divider of claim 1, wherein, The half-waveguide-full-waveguide gradual change structure is square horn-shaped, and realizes the structure transformation from a half-size waveguide to a full-size waveguide.

6. The Ka-band waveguide three-way power divider of claim 2, wherein, The power resistor load is a gallium nitride power resistor load suitable for the Ka frequency band, and can withstand 30W continuous wave power; the power resistor load is welded in the groove of the lower box body through gold-tin eutectic welding, and the end of the microstrip probe and the power resistor load are connected through a gold strip or multiple gold wires.

7. The Ka-band waveguide three-way power divider of claim 2, wherein, The microstrip probe is arranged on an RT / duroid 5880 dielectric plate with a thickness of 0.254mm, and the copper layer has a thickness of 18μm; the dielectric plate is adhered to the lower box body through conductive adhesive.

8. The Ka-band waveguide three-way power divider of claim 1, wherein, The oblique wedge-shaped waveguide matching load is made of silicon carbide material; the silicon carbide material is adhered to the inner wall of the waveguide through GD414 silicone rubber; the oblique wedge-shaped waveguide matching load can withstand 20W continuous wave power.

9. The Ka-band waveguide three-way power divider of claim 2, wherein, The shielding box is made of brass material and plated with gold on the surface; the microstrip probe and the power resistance load are located in the lower box body, and corresponding cavity structures are arranged on the upper box body; the oblique wedge-shaped waveguide matching load is located in the waveguide cavity formed by the upper box body and the lower box body and is fixed by silicone rubber; the upper box body is provided with a plurality of counterbores, the lower box body is provided with corresponding threaded holes, and the upper box body and the lower box body are fixed by screws penetrating through the counterbores and the threaded holes, thereby forming the shielding box.

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