Ka-band waveguide three-way power divider

Abstract

The invention discloses a Ka-band waveguide three-way power divider, which belongs to the technical field of microwave and millimeter waves, and is characterized in that a combining port is formed in the front side wall of a shielding box, and three distribution ports are formed in the rear side wall of the shielding box; a coplanar magic T equal power divider, a coplanar magic T equal 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 are arranged in the shielding box. Wherein the coplanar magic T equal 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 paths of signals with equal amplitude and opposite phases; the branch waveguide unequal power divider comprises a four-branch waveguide directional coupler and an inclined-wedge-shaped waveguide matching load, and the output power ratio of a straight-through output port to a coupling output port is 2: 1. The filter has the advantages of being symmetrical in structure, good in amplitude and phase consistency, small in insertion loss, good in port standing wave and high in isolation degree.

Description

Technical Field

[0001] The invention relates to a Ka-band waveguide three-way power distributor, belongs to the technical field of microwave 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 Art

[0002] At present, the maximum output power of domestic Ka-band GaN power amplifier chips is 20W (working in continuous wave mode). In order to obtain higher power output, multiple chips must be combined for power. Traditional power combination mainly adopts multi-level binary (2 n ) power synthesis method, but in actual engineering applications, the binary power synthesis method has the following shortcomings: using two (2 1 ) The combined output power is not enough; using four (2 2 ) The combined output power margin is large, but doubling the number of chips results in increased power consumption and higher overall machine cost.

[0003] In response to the above problems, domestic and foreign scholars have conducted research on waveguide three-way equal power dividers. In July 2012, Caibo published "A Design of a Ka-band Waveguide Three-way Power Divider" in the journal "Telemetry and Remote Control", proposing a Ka-band three-way equal power divider, including 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, Caibo applied for an invention patent "A Waveguide Three-way Equal Power Divider / Combiner", application publication number CN102820509A. In October 2017, Zhao Qing et al. applied for an invention patent "A BJ320 One-to-Three Waveguide Power Divider", authorization publication number CN207265208U, disclosing a Ka-band (33.5GHz~36.5GHz) one-to-three waveguide power divider, whose structure is similar to the structure proposed by Caibo. In October 2022, Huang Xuelong and others published "Development of Ku-band 120W Miniaturized Power Amplifier Module" in the Journal of Changchun Normal University. They slightly modified the structure proposed by Cai Bo and applied it to six-way power synthesis in the Ku-band. Six 30W GaN power amplifier chips were used for power synthesis, with an output power of about 120W to 131W, and a synthesis efficiency of only 66.7% to 72.8%. The waveguide three-way power divider proposed in the above papers and patents uses a waveguide T-junction as a three-port lossless device, so the overall structure has the following disadvantages: the isolation between the three output ports is poor, with an isolation of less than 10dB; the standing wave ratio of the middle output port is very poor, and the return loss is 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, which not only leads to low power synthesis efficiency of the whole machine, but also affects the long-term reliability of the equipment. Summary of the invention

[0004] In order to overcome the deficiencies of the above-mentioned prior art, the present invention proposes 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 object, the technical solution adopted by the present invention is:

[0006] A Ka-band waveguide three-way power divider comprises a shielding box, which is divided into an upper box body and a lower box body, and has a cavity inside; a front side wall of the shielding box is provided with a combining port, and a rear side wall is provided with three distribution ports; a coplanar magic T equal power divider, a coplanar magic T equal power combiner, a branch waveguide unequal power divider, an L-shaped waveguide, a Z-shaped waveguide and a half-waveguide-full-waveguide gradient structure are provided in the shielding box;

[0007] The branch waveguide unequal power dividers are provided with two and are symmetrically arranged; each branch waveguide unequal power divider includes a four-branch waveguide directional coupler and a wedge-shaped waveguide matching load;

[0008] The input ports of the four-branch waveguide directional coupler are connected through an L-shaped waveguide a, and then connected to an output port of a coplanar magic T power divider through a half-waveguide-full-waveguide gradient structure a;

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

[0010] The coupled output port of the four-branch waveguide directional coupler is connected to the L-shaped waveguide b, and then connected to an input port of a coplanar magic T power combiner through a half-waveguide-full-waveguide gradient structure b;

[0011] The isolated output port of the four-branch waveguide directional coupler is connected to the corresponding wedge-shaped waveguide matching load;

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

[0013] Furthermore, the coplanar magic T equal power divider and the coplanar magic T equal power combiner each include an ET junction waveguide cavity, two equal branch waveguide cavities and a microstrip probe, wherein one end of the microstrip probe is inserted into the ET junction waveguide cavity, and the other end is connected to the power resistor load; the connection between the equal branch waveguide cavity and the ET junction waveguide cavity is a half-size rectangular waveguide port, and the end port of the equal branch waveguide cavity is connected to the half-waveguide-full waveguide gradient structure

[0014] Furthermore, the L-shaped waveguide is two sections of standard straight waveguides intersecting vertically, and the corners of the waveguide intersection are beveled at 45°.

[0015] Furthermore, the Z-shaped waveguide is three sections of standard straight waveguides that intersect vertically in sequence, and the corners at the intersections of the waveguides are all beveled at 45°; one end of the Z-shaped waveguide is connected to the straight-through output port of the branch waveguide unequal power divider, and the other end is connected to a distribution port of the shielding box; by adjusting the horizontal waveguide length of the Z-shaped waveguide, it can be ensured that the three distribution ports of the shielding box output signals of equal amplitude and phase.

[0016] Furthermore, the half-waveguide-full-waveguide gradient structure is in a square trumpet shape, realizing the structural transformation from a half-size waveguide to a full-size waveguide.

[0017] Furthermore, the power resistor load is a gallium nitride power resistor load suitable for the Ka band and can withstand 30W continuous wave power; the power resistor load is welded in the groove of the lower box body by gold-tin eutectic welding, and the end of the microstrip probe and the power resistor load are bonded by a gold ribbon or multiple gold wires.

[0018] Furthermore, the microstrip probe is placed on a RT / duroid 5880 dielectric board with a thickness of 0.254 mm, and the copper layer thickness is 18 μm; the dielectric board is bonded to the lower box body by conductive adhesive.

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

[0020] Furthermore, the shielding box is made of brass material with gold plating on the surface; the microstrip probe and power resistor load are located in the lower box body, and the upper box body is provided with a corresponding cavity structure; the oblique wedge 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 countersunk holes, and the lower box body is provided with corresponding threaded holes, and the upper box body and the lower box body are fixed by screws passing through the countersunk holes and the threaded holes to form a shielding box.

[0021] Compared with the prior art, the present invention has the following beneficial effects:

[0022] 1. The present invention proposes a waveguide three-way power divider in Ka frequency band (29GHz-31GHz), and its effect is to divide the Ka frequency band input signal into three-way signals of equal amplitude and phase; The present invention has the characteristics of symmetric structure, good amplitude-phase consistency, little insertion loss, good port standing wave and high isolation, and solves the problem that the output port isolation of existing waveguide three-way power divider is low and the standing wave ratio is poor.

[0023] 2. The present invention is applied in reverse, that is, a Ka-band waveguide three-way power combiner. Under the condition of ensuring good heat dissipation of the shielding box, the power resistor load can withstand 30W continuous wave power, and the wedge-shaped waveguide matching load can withstand 20W continuous wave power. The present invention can meet the needs of larger power synthesis.

[0024] 3. The present invention solves the problem of binary (2 n ) The shortcomings of the power synthesis method. The present invention is combined and cascaded with the traditional binary waveguide power distributor / synthesizer to achieve non-binary power synthesis such as six-way, nine-way, and twelve-way, that is, to achieve a reasonable selection of the number of power amplifier chips, which is beneficial to improving the cost performance of the power amplifier and reducing the cost of the whole machine. The present invention is particularly suitable for application in Ka-band solid-state power amplifiers and has a high value of promotion and application. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a schematic diagram of the appearance structure of the present invention;

[0026] Figure 2 It is a schematic diagram of the upper and lower box structures of the present invention;

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

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

[0029] Figure 5 It is a schematic diagram of the top view of the coplanar magic T power divider of the present invention;

[0030] Figure 6 It is a schematic diagram of the top view of the structure of the branch waveguide unequal power divider of the present invention;

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

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

[0033] Fig. 9 is an output port isolation curve diagram of the present invention;

[0034] Fig.10 It is a return loss curve diagram of the input and output ports of the present invention.

[0035] The combined port of the shielding box is port I, and the three distribution ports are port III, port II and port IV from left to right. Among them, the structures of port III and port IV are symmetrical, and the curves overlap, so Figure 7-10The curve of port IV is not shown, but the curve of port III can be used for reference. DETAILED DESCRIPTION

[0036] To facilitate those skilled in the art to understand the technical content of the present invention, the present invention is further described below with reference to the accompanying drawings.

[0037] See also Figure 1-Figure 6 The present invention is a Ka-band waveguide three-way power divider, comprising a shielding box, which is divided into an upper box body 1 and a lower box body 2, and has a cavity inside; the front side wall of the shielding box is provided with a combining port, and the rear side wall is provided with three distribution ports; the shielding box is provided with a coplanar magic T equal power divider 3, a coplanar magic T equal power synthesizer 4, a branch waveguide unequal power divider 5, an "L"-shaped waveguide 6, a "Z"-shaped waveguide 7, and a half-waveguide-full waveguide gradient structure 8.

[0038] The Ka-band waveguide three-way power divider is a bilaterally symmetrical structure; the combining port on the front side wall of the shielding box is connected to the input port of the coplanar magic T equal power divider 3; the two output ports of the coplanar magic T equal power divider 3 are respectively connected to the half-waveguide-full-waveguide gradient structure 8, and then pass through the "L"-shaped waveguide 6 to be connected to the input ports of the two branch waveguide unequal power dividers 5 respectively; the straight-through output port of the branch waveguide unequal power divider 5 in the left area passes through the "Z"-shaped waveguide 7 and is connected to the leftmost distribution port on the rear side wall of the shielding box; The through port of the branch waveguide unequal power divider 5 passes through the "Z"-shaped waveguide 7 and is connected to the rightmost distribution port on the rear side wall of the shielding box; the coupled output ports of the two branch waveguide unequal power dividers 5 pass through the "L"-shaped waveguide 6 respectively, connected to the half-waveguide-full-waveguide gradient structure 8, and then are respectively connected to the two input ports of the coplanar magic T equal power synthesizer 4; the isolation ports of the two branch waveguide unequal power dividers 5 are respectively connected to the oblique waveguide matching load 9; the output port of the coplanar magic T equal power synthesizer 4 is connected to the distribution port in the middle of the rear side wall of the shielding box.

[0039] Furthermore, the coplanar magic T equal power divider 3 includes an ET junction waveguide cavity 10 and two equal branch waveguide cavities 11, and also includes a microstrip probe 12, one end of the microstrip probe 12 is inserted into the ET junction waveguide cavity 10, and the other end is connected to the power resistor load 13; the equal branch waveguide cavity 11 is connected to the ET junction waveguide cavity 10 at a half-size rectangular waveguide port (7.12mm×1.78mm), and the end port of the equal branch waveguide cavity 11 is connected to the half-waveguide-full waveguide gradient structure 8. The function of the coplanar magic T equal power divider 3 is to split one input signal into two output signals of equal amplitude and anti-phase. The coplanar magic T equal power synthesizer 4 is the reverse application of the coplanar magic T equal power divider 3, and its function is to synthesize two input signals of equal amplitude and anti-phase into one output signal.

[0040] Specifically, the microstrip probe 12 is placed on a RT / duroid5880 dielectric board with a thickness of 0.254 mm, and the copper layer thickness is 18 μm; the dielectric board is bonded to the lower box body 2 by conductive glue. The power resistor load 13 is a gallium nitride power resistor load suitable for the Ka band, which can withstand 30W continuous wave power; the power resistor load 13 is welded 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 ribbon or multiple gold wires.

[0041] Furthermore, the branch waveguide unequal power divider 5 includes a four-branch waveguide directional coupler 14 and a slash-shaped waveguide matching load 9; the input port of the four-branch waveguide directional coupler 14 is connected to the "L"-shaped waveguide 6; the straight-through output port passes through the "Z"-shaped waveguide 7 and is connected to a distribution port on the rear side wall of the shielding box; the coupled output port is connected to the "L"-shaped waveguide 6, passes through a half-waveguide-full-waveguide gradient structure 8, and is finally connected to an input port of a coplanar magic T equal power synthesizer 4; the isolated output port is connected to the slash-shaped waveguide matching load 9; a four-slit coupling array is provided between the input port and the coupled output port, and the longitudinal dimensions of the four slots are 0.86 mm, 1.5 mm, 1.5 mm and 0.86 mm from bottom to top, respectively, and the longitudinal dimensions of the three rectangular columns are 2.4 mm, 1.76 mm and 2.4 mm from bottom to top, respectively, and the transverse lengths of the slots and the rectangular columns are both 2.6 mm. The function of the branch waveguide unequal power divider 5 is to distribute the input signal in unequal power, with the through output port outputting two-thirds of the total power and the coupled output port outputting one-third of the total power, that is, the output power ratio of the through output port to the coupled output port is 2:1.

[0042] Specifically, the slashed waveguide matching load 9 is made of silicon carbide material with a total length of 14.5 mm; the silicon carbide material is bonded to the inner wall of the waveguide through GD414 silicone rubber, absorbs microwave energy and converts it into heat, and transfers the heat to the shielding box by heat conduction; the slashed waveguide matching load 9 can withstand 20W continuous wave power.

[0043] Furthermore, the "L"-shaped waveguide 6 is composed of two standard straight waveguides intersecting vertically, the corners of the waveguide intersection are 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 minimum insertion loss and the optimal return loss.

[0044] Further, the "Z"-shaped waveguide 7 is three sections of standard straight waveguides intersecting vertically in sequence, and the shape is similar to a "Z" shape; the corners at the intersection of the waveguides are all beveled at 45°, and the transverse and longitudinal inscribed dimensions are both 2.87mm to ensure that it has the minimum insertion loss and the optimal return loss; one end of the "Z"-shaped waveguide 7 is connected to the straight-through output port of the branch waveguide unequal power divider 5, and the other end is connected to a distribution port of the shielding box; by adjusting the horizontal waveguide length of the "Z"-shaped waveguide 7, it can be ensured that the three distribution ports of the shielding box output signals of equal amplitude and phase. In this embodiment, the distance between the longitudinal center line of the central distribution port and the longitudinal center line of the branch waveguide unequal power divider 5 is 18mm, and the horizontal waveguide length of the "Z"-shaped waveguide 7 is adjusted. When the distance between the longitudinal center line of the branch waveguide unequal power divider 5 in the right area and the center line of the right distribution port is 22.22mm, it can be ensured that the three distribution ports of the shielding box output signals of equal amplitude and phase.

[0045] Furthermore, the half-waveguide-full-waveguide gradient structure 8 is in a square trumpet shape, realizing the structural transformation from a half-size waveguide (7.12mm×1.78mm) to a full-size waveguide (7.12mm×3.56mm); after software optimization, the length of the half-waveguide-full-waveguide gradient structure 8 is 7.5mm, and has the characteristics of small insertion loss and excellent return loss.

[0046] Furthermore, the shielding box is made of brass material and is gold-plated on the surface; the shielding box is composed of an upper box body 1 and a lower box body 2 that are interlocked, the microstrip probe 12 and the power resistor load 13 are located in the lower box body 2, and a corresponding cavity structure is provided on the upper box body 1; the oblique wedge 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 countersunk holes, and 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 countersunk holes and the threaded holes to form a shielding box.

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

[0048] Figure 7-Figure 9 They are respectively the output port amplitude curve, phase curve and isolation curve of the present invention, Fig.10 It is a return loss curve of the input and output ports. It can be seen from the figure that within the Ka band (29GHz-31GHz), the amplitude difference of the three output ports of the present invention is within 0.1dB; the phase difference is within 6.1°; the isolation between port II and port III, port II and port IV is better than 23dB, and the isolation between port III and port IV is better than 29dB; the return loss of the input and output ports is better than 22dB.

[0049] The conversion relationship between return loss (RL) and standing wave ratio (VSWR) is shown in formula (1).

[0050]

[0051] According to formula (1), the return loss of 22dB corresponds to a standing wave ratio of 1.17.

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

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

[0054] A Ka-band signal with a power of P is input from a combining port on the front side wall of the shielding box, and the combining port is connected to an input port of a coplanar magic T equal power divider 3; the coplanar magic T equal power divider 3 branches the Ka-band input signal into two output signals of equal amplitude and opposite phase; after passing through a half-waveguide-full-waveguide gradient structure 8 and an "L"-shaped waveguide 6, the signals are transformed into two signals of equal amplitude and same phase, i.e., the power of each signal is P / 2, and they enter two branch waveguide unequal power dividers 5 respectively; the branch waveguide unequal power divider 5 performs unequal power distribution on the P / 2 signal, and the output power ratio between the through output port and the coupled output port is 2:1. , that is, 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 coupled output port signals of the two branch waveguide unequal power dividers 5 are two equal-amplitude and in-phase signals, which become two equal-amplitude and in-phase signals after passing through the "L"-shaped waveguide 6 and the half-waveguide-full-waveguide gradient structure 8, and each signal power is P / 6; the two equal-amplitude and in-phase signals pass through the coplanar magic T equal power synthesizer 4 and are synthesized into one signal with an output power of P / 3; at the same time, the horizontal waveguide length of the "Z"-shaped waveguide 7 is adjusted to make the phases of the output signals of the three distribution ports on the rear side wall of the shielding box consistent. In summary, the three distribution ports of the Ka-band waveguide three-way power divider output three equal-amplitude and in-phase signals.

[0055] Those skilled in the art will appreciate that the embodiments described are intended to help readers understand the principles of the present invention, and should be understood that the scope of protection of the present invention is not limited to the embodiments described. For those skilled in the art, the present invention may have various changes and variations. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of the claims of the present invention.

Claims

1. A Ka-band waveguide three-way power divider, comprising a shielding box, characterized in that: The shielding box is divided into an upper box body and a lower box body, and a cavity is provided inside the upper box body; a combining port is provided on the front side wall of the shielding box, and three distribution ports are provided on the rear side wall; a coplanar magic T equal power divider, a coplanar magic T equal power combiner, a branch waveguide unequal power divider, an L-shaped waveguide, a Z-shaped waveguide and a half-waveguide-full-waveguide gradient structure are provided inside the shielding box; The branch waveguide unequal power dividers are provided with two and are symmetrically arranged; each branch waveguide unequal power divider includes a four-branch waveguide directional coupler and a wedge-shaped waveguide matching load; The input ports of the four-branch waveguide directional coupler are connected through an L-shaped waveguide a, and then connected to an output port of a coplanar magic T power divider through a half-waveguide-full-waveguide gradient structure a; The straight-through output port of the four-branch waveguide directional coupler is connected to a distribution port on the rear side wall of the shielding box through a Z-shaped waveguide; The coupled output port of the four-branch waveguide directional coupler is connected to the L-shaped waveguide b, and then connected to an input port of a coplanar magic T power combiner through a half-waveguide-full-waveguide gradient structure b; The isolated output port of the four-branch waveguide directional coupler is connected to the corresponding wedge-shaped waveguide matching load; A four-slot coupling array is arranged between the input port and the coupled output port of the four-branch waveguide directional coupler.

2. A Ka-band waveguide three-way power divider according to claim 1, characterized in that: The coplanar magic T equal power divider and the coplanar magic T equal power combiner both include an ET junction waveguide cavity, two equal branch waveguide cavities and a microstrip probe, wherein one end of the microstrip probe is inserted into the ET junction waveguide cavity, and the other end is connected to the power resistor load; the connection between the equal branch waveguide cavity and the ET junction waveguide cavity is a half-size rectangular waveguide opening, and the end port of the equal branch waveguide cavity is connected to a half-waveguide-full waveguide gradient structure.

3. A Ka-band waveguide three-way power divider according to claim 1, characterized in that: The L-shaped waveguide is composed of two sections of standard straight waveguides intersecting vertically, and the corners at the intersection of the waveguides are beveled at 45°.

4. A Ka-band waveguide three-way power divider according to claim 1, characterized in that: The Z-shaped waveguide is composed of three sections of standard straight waveguides intersecting vertically in sequence, and the corners at the intersections of the waveguides are all beveled at 45°; one end of the Z-shaped waveguide is connected to the straight-through output port of the branch waveguide unequal power divider, and the other end is connected to a distribution port of the shielding box; by adjusting the horizontal waveguide length of the Z-shaped waveguide, it can be ensured that the three distribution ports of the shielding box output signals of equal amplitude and phase.

5. The Ka-band waveguide three-way power divider according to claim 1, characterized in that: The half-waveguide-full-waveguide gradient structure is in a square trumpet shape, realizing the structural transformation from a half-size waveguide to a full-size waveguide.

6. A Ka-band waveguide three-way power divider according to claim 1, characterized in that: The power resistor load is a gallium nitride power resistor load suitable for the Ka 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 bonded and connected by a gold ribbon or multiple gold wires.

7. The Ka-band waveguide three-way power divider according to claim 1, characterized in that: The microstrip probe is placed on a RT / duroid 5880 dielectric board with a thickness of 0.254 mm, and the copper layer thickness is 18 μm; the dielectric board is bonded to the lower box body by conductive adhesive.

8. The Ka-band waveguide three-way power divider according to claim 1, characterized in that: The oblique-wedge-shaped waveguide matching load is made of silicon carbide material; the silicon carbide material is bonded 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 according to claim 1, characterized in that: The shielding box is made of brass material with gold plating on the surface; the microstrip probe and the power resistor load are located in the lower box body, and the upper box body is provided with a corresponding cavity structure; the oblique wedge 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 countersunk holes, and the lower box body is provided with corresponding threaded holes, and the upper box body and the lower box body are fixed by screws passing through the countersunk holes and the threaded holes to form a shielding box.

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