Dual-frequency high-power microwave beat wave synthesizer

Abstract

The invention provides a dual-frequency high-power microwave beat wave synthesizer, relates to a microwave synthesis device, and solves the technical problems of complex structure, large size and low power capacity of a beat wave synthesizer based on an over-mode circular waveguide filter adopted in the prior art. The beat-wave power divider comprises a beat-wave power segment, an output unit and a first rectangular waveguide, one input end of the beat wave power section is connected with the output end of the first input unit, and the other input end of the beat wave power section is connected with the output end of the second input unit; the first input unit comprises a first band-pass filter and is used for inputting high-power microwaves of a first frequency; the second input unit comprises a power divider synthesizer and is used for inputting high-power microwaves of a second frequency; the output unit comprises a beat wave synthesis section, one end of the beat wave synthesis section is a short circuit surface, and the other end is an output end; the input end of the first rectangular waveguide is connected with the output end of the beat wave power segment, and the output end is connected with the side wall of one end of the beat wave synthesis segment as the short circuit surface.

Description

Technical Field

[0001] The present invention relates to a microwave synthesis device, in particular to a dual-frequency high-power microwave beat wave synthesizer. Background Art

[0002] High-power microwaves typically refer to strong electromagnetic pulses with peak powers exceeding megawatts and frequencies between 1 GHz and 300 GHz. Their high power, short pulses, and wide bandwidth make them widely used in various fields, including medicine and industry.

[0003] With the development of high-power microwave technology, the output power and output energy of a single high-power microwave source are increasingly unable to meet application requirements. Research on high-power microwave synthesis technology has become a major development direction for high-power microwave technology. High-power microwave synthesis methods are divided into power synthesis and beat wave synthesis. Compared to power synthesis, beat wave synthesis has lower requirements for high-power microwave sources and is easier to implement. Therefore, beat wave synthesis is the main method used in existing technologies to synthesize high-power microwaves. In the beat wave synthesis process, the beat wave synthesizer is a key component of high-power microwave beat wave synthesis. Currently, beat wave synthesizers based on overmoded circular waveguide filters are mainly used to achieve high-power microwave synthesis. Microwaves of different frequencies are filtered through the overmoded circular waveguide filter, and then the filtered microwaves are beat wave synthesized. Finally, the synthesized microwaves are output through a radial waveguide structure. However, existing beat wave synthesizers based on overmoded circular waveguide filters have technical problems such as complex structure, large size, and low power capacity. Summary of the Invention

[0004] The purpose of the present invention is to solve the technical problems of the existing technology of the beat wave synthesizer based on the overmoded circular waveguide filter, such as complex structure, large volume and low power capacity, and to provide a dual-frequency high-power microwave beat wave synthesizer.

[0005] In order to achieve the above objectives, the technical solutions provided by the present invention are:

[0006] A dual-frequency high-power microwave beat-wave synthesizer is characterized in that it comprises a beat-wave power segment, an output unit coaxial with the beat-wave power segment, and a plurality of first rectangular waveguides arranged between the beat-wave power segment and the output unit;

[0007] One input end of the beat power segment is connected to the output end of the first input unit, and the other input end is connected to the output end of the second input unit;

[0008] The first input unit includes a first band-pass filter, the input end of the first band-pass filter is the first input end, and the output end is connected to an input end of the beat power segment, and is used to input high-power microwaves of a first frequency;

[0009] The second input unit includes a power divider combiner, the input end of the power divider combiner is the second input end, and the output end is connected to the input end of the second band pass filter; the output end of the second band pass filter is connected to another input end of the beat wave power divider segment, for inputting high-power microwaves of the second frequency;

[0010] The output unit includes a beat wave synthesis section, one end of which is set as a short circuit path, and the other end is an output end for outputting microwave beat waves;

[0011] The input ends of the plurality of first rectangular waveguides are connected to the output ends of the beat wave power segments, and the output ends are connected to a side wall of the beat wave synthesis segment which is set as a short-circuit surface.

[0012] Furthermore, in order to meet the power capacity requirements, the beat wave power segment includes a first connecting segment, a mounting portion and a second connecting segment connected in sequence. The first connecting segment and the second connecting segment are symmetrically arranged, and each includes a frustum-shaped waveguide and a circular waveguide connected to the small end of the frustum-shaped waveguide at one end. The other end of the circular waveguide is connected to the mounting portion, and a chamfer is provided at the connection; the mounting portion includes a first radial line, one end of the first radial line is connected to the circular waveguide, and the other end is connected to one end of a first rectangular waveguide. The size of the first radial line matches the size of the first rectangular waveguide; the large end of the frustum-shaped waveguide of the first connecting segment constitutes an input end of the beat wave power segment, the large end of the frustum-shaped waveguide of the second connecting segment constitutes another input end of the beat wave power segment, and the other end of the first radial line constitutes an output end of the beat wave power segment.

[0013] Furthermore, the first bandpass filter is segmentally coaxial with the beat wave power, and includes a first circular waveguide, a second circular waveguide, a third circular waveguide, a fourth circular waveguide and a fifth circular waveguide connected in sequence, with frustum transitions between any two adjacent circular waveguides; the input end of the first circular waveguide constitutes the input end of the first bandpass filter, and the output end of the fifth circular waveguide constitutes the output end of the first bandpass filter.

[0014] Furthermore, the second band-pass filter is segmentally coaxial with the beat wave power, and includes a sixth circular waveguide, a seventh circular waveguide, an eighth circular waveguide, a ninth circular waveguide and a tenth circular waveguide connected in sequence, and a frustum transition is formed between each adjacent circular waveguide; the input end of the sixth circular waveguide constitutes the input end of the second band-pass filter, and the output end of the tenth circular waveguide constitutes the output end of the second band-pass filter.

[0015] Furthermore, the beat wave synthesis section is coaxial with the beat wave power segment and is spaced apart from the second bandpass filter, comprising a first connection portion, an installation portion, a second connection portion and a transition portion connected in sequence, the first connection portion and the second connection portion being symmetrically arranged, each comprising a frustum-shaped waveguide and a circular waveguide, the small end of the frustum-shaped waveguide being connected to one end of the circular waveguide, a chamfer being provided at the connection, the other end of the circular waveguide being connected to one end of the installation section, and the connection being transitioned through a chamfer; the installation section comprising a second radial line, one end of the second radial line being connected to the circular waveguide, and the other end being respectively connected to the other end of a first rectangular waveguide, the size of the second radial line matching the size of the first rectangular waveguide; the transition section being a circular waveguide, one end of which is an output end, and the other end being connected to the large end of the frustum-shaped waveguide; the large end of the frustum-shaped waveguide of the first connection portion constituting a short-circuit surface of the beat wave synthesis section, and one end of the circular waveguide of the transition section constituting the other end of the beat wave synthesis section, for outputting microwave beat waves.

[0016] Furthermore, the main sections of the multiple first rectangular waveguides are parallel to the axis of the beat wave power segment, and their input ends are respectively connected to the other end of the first radial line of the beat wave power segment, and their output ends are respectively connected to the other end of the second radial line of the beat wave synthesis segment; the outer turning points of the main section of each first rectangular waveguide are all right-angle turns, and the right-angle turns are provided with chamfers.

[0017] Furthermore, the power divider and combiner is perpendicular to the axis of the beat wave power segment and includes a plurality of second rectangular waveguides located between the input end and the output end thereof, and each second rectangular waveguide is inserted between two adjacent first rectangular waveguides.

[0018] Furthermore, the second input end is parallel to the axis of the beat power segment.

[0019] Furthermore, the number of the first rectangular waveguides is 8.

[0020] Furthermore, the number of the second rectangular waveguides is 8.

[0021] Beneficial effects of the present invention:

[0022] 1. The present invention provides a dual-frequency high-power microwave beat wave synthesizer, which selects and extracts high-power microwaves through a first bandpass filter and a second bandpass filter with simple structures, thereby simplifying the structure of the beat wave synthesizer.

[0023] 2. The present invention provides a dual-frequency high-power microwave beat wave synthesizer, which performs beat wave synthesis on high-power microwaves of different frequencies through a first radial line and a second radial line, thereby greatly improving the power capacity of the beat wave synthesizer.

[0024] 3. The dual-frequency high-power microwave beat wave synthesizer provided by the present invention utilizes a power splitter to inject high-power microwaves of the second frequency, thereby making the structure of the beat wave synthesizer more compact. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 1 is a schematic diagram of the overall structure of an embodiment of a dual-frequency high-power microwave beat wave synthesizer of the present invention;

[0026] Figure 2 Schematic diagram of the structure of the first input unit, the beat wave power segment, the second bandpass filter, the first rectangular waveguide and the output unit in an embodiment of the present invention;

[0027] Figure 3 yes Figure 2 AA section view;

[0028] Figure 4 is a schematic structural diagram of a first radial line in an embodiment of the present invention;

[0029] Figure 5 is a schematic diagram of the dimensions of the first bandpass filter in an embodiment of the present invention;

[0030] Figure 6 is a schematic diagram of the dimensions of the second bandpass filter in an embodiment of the present invention;

[0031] Figure 7 2. It is a schematic diagram of the dimensions of the beat wave power segment in an embodiment of the present invention;

[0032] Figure 8 1 is a diagram of S-parameter simulation results of an embodiment of the present invention;

[0033] Figure 9 This is a cross-sectional electric field distribution diagram of an embodiment of the present invention when high-power microwaves at a first frequency are injected;

[0034] Figure 10 This is a cross-sectional electric field distribution diagram of an embodiment of the present invention when high-power microwaves at a second frequency are injected.

[0035] Figure Number:

[0036] 1-beat wave power segment, 11-first radial line, 2-output unit, 21-beat wave synthesis section, 22-output end, 3-first rectangular waveguide, 31-turn, 4-first input unit, 41-first bandpass filter, 411-first circular waveguide, 412-second circular waveguide, 413-third circular waveguide, 414-fourth circular waveguide, 415-fifth circular waveguide, 42-first input end, 5-second input unit, 51-power divider and combiner, 511-second rectangular waveguide, 52-second input end, 53-second bandpass filter, 531-sixth circular waveguide, 532-seventh circular waveguide, 533-eighth circular waveguide, 534-ninth circular waveguide, 535-tenth circular waveguide. DETAILED DESCRIPTION

[0037] The present invention will be described in further detail below with reference to the accompanying drawings and specific embodiments:

[0038] A dual-frequency high-power microwave beat-wave synthesizer, such as Figure 1 As shown, it includes a beat wave power segment 1, an output unit 2 coaxial with the beat wave power segment 1, and a plurality of first rectangular waveguides 3 arranged between the beat wave power segment 1 and the output unit 2; one input end of the beat wave power segment 1 is connected to the output end of the first input unit 4, and the other input end is connected to the output end of the second input unit 5; the first input unit 4 includes a first bandpass filter 41, the input end of the first bandpass filter is the first input end 42, and the output end is connected to an input end of the beat wave power segment 1 for inputting high-power microwaves of a first frequency; the second input unit 5 includes a power divider and a combiner The power divider and combiner 51 has an input end which is a second input end 52, and an output end which is connected to an input end of a second band-pass filter 53; an output end of the second band-pass filter 53 is connected to another input end of the beat wave power segment 1 for inputting high-power microwaves of a second frequency; the output unit 2 includes a beat wave synthesis segment 21, one end of the beat wave synthesis segment 21 is set as a short circuit surface, and the other end is an output end 22 for outputting microwave beat waves; the input ends of the plurality of first rectangular waveguides 3 are connected to the output end of the beat wave power segment 1, and the output end is connected to a side wall of one end of the beat wave synthesis segment 21 which is set as a short circuit surface.

[0039] like Figures 1 to 3 As shown, the beat wave power segment 1 includes a first connecting segment, a mounting portion, and a second connecting segment connected in sequence. The first connecting segment and the second connecting segment are symmetrically arranged, each including a frustum-shaped waveguide and a circular waveguide connected to the small end of the frustum-shaped waveguide at one end, and the other end of the circular waveguide is connected to the mounting portion, and a chamfer is provided at the connection; as shown Figure 4 As shown, the mounting portion includes a first radial line 11, one end of the first radial line 11 is connected to the circular waveguide, and the other end is connected to one end of a first rectangular waveguide 3, and the size of the first radial line 11 matches the size of the first rectangular waveguide 3; the large end of the frustum-shaped waveguide of the first connecting section constitutes an input end of the beat wave power segment 1, the large end of the frustum-shaped waveguide of the second connecting section constitutes the other input end of the beat wave power segment 1, and the other end of the first radial line 11 constitutes the output end of the beat wave power segment 1.

[0040] like Figure 5 As shown, the first bandpass filter 41 is coaxial with the beat wave power segment 1, and includes a first circular waveguide 411, a second circular waveguide 412, a third circular waveguide 413, a fourth circular waveguide 414, and a fifth circular waveguide 415 connected in sequence, with a frustum transition between any two adjacent circular waveguides. Definition: The radii of the first circular waveguide 411, the second circular waveguide 412, the third circular waveguide 413, the fourth circular waveguide 414, and the fifth circular waveguide 415 are r0, r1, r2, r3, r4, r5, r6, r7, r8, r9, r10, r11, r12, r13, r14, r15, r16, r17, r18, r19, r20, r21, r22, r23, r24, r25, r26, r27, r 11 、r 12 、r13 、r 14 , the lengths are l0, l 11 、l 12 、l 13 、l 14 ; then: r 14 =r0, r0<r 12 <r 13 <r 11 ; l 14 =l0,l 13 <l 12 <l0<l 11 The input end of the first circular waveguide 411 constitutes the input end of the first bandpass filter 41, and the output end of the fifth circular waveguide 415 constitutes the output end of the first bandpass filter 41.

[0041] like Figure 6 As shown, the second bandpass filter 53 is coaxial with the beat wave power segment 1 and includes a sixth circular waveguide 531, a seventh circular waveguide 532, an eighth circular waveguide 533, a ninth circular waveguide 534 and a tenth circular waveguide 535 connected in sequence, with a frustum transition between any two adjacent circular waveguides. It is defined that the radii of the sixth circular waveguide 531, the seventh circular waveguide 532, the eighth circular waveguide 533, the ninth circular waveguide 534 and the tenth circular waveguide 535 are r 20 、r 21 、r 22 、r 23 、r 24 , the lengths are l 20 、l 21 、l 22 、l 23 、l 24 ; then: r 24 =r 20 =r0, r 20 <r 21 <r 23 <r 22 ; l 24 =l 20 =l0,l 23 <l 22 <l 21 <l 20 The input end of the sixth circular waveguide 531 constitutes the input end of the second bandpass filter 53, and the output end of the tenth circular waveguide 535 constitutes the output end of the second bandpass filter 53.

[0042] The beat wave synthesis section 21 is coaxial with the beat wave power segment 1 and spaced apart from the second bandpass filter 53. It includes a first connecting portion, a mounting portion, a second connecting portion, and a transition portion, which are sequentially connected. The first and second connecting portions are symmetrically arranged and each include a frustum-shaped waveguide and a circular waveguide. The small end of the frustum-shaped waveguide is connected to one end of the circular waveguide, with a chamfered connection. The other end of the circular waveguide is connected to one end of the mounting portion, with a chamfered transition. The mounting portion includes a second radial line, one end of which is connected to the circular waveguide and the other end is connected to the other end of each first rectangular waveguide 3. The dimensions of the second radial line match those of the first rectangular waveguide 3. The transition section is a circular waveguide, one end of which is the output end and the other end is connected to the large end of the frustum-shaped waveguide. The large end of the frustum-shaped waveguide in the first connecting portion forms the short-circuit path of the beat wave synthesis section 21, and one end of the circular waveguide in the transition portion forms the other end of the beat wave synthesis section 21, which is used to output the microwave beat wave. The second radial line has a similar structure to the first radial line 11.

[0043] The main sections of the multiple first rectangular waveguides 3 are parallel to the axis of the beat wave power segment 1, and their input ends are respectively connected to the other end of the first radial line 11 of the beat wave power segment 1, and their output ends are respectively connected to the other end of the second radial line of the beat wave synthesis segment 21; the outer turning points 31 of the main section of each first rectangular waveguide 3 are all right-angle turns, and the right-angle turns are provided with chamfers.

[0044] The power divider / combiner 51 is perpendicular to the axis of the beat wave power segment 1 and includes multiple second rectangular waveguides 511 located between its input and output ends. Each second rectangular waveguide 511 is interposed between two adjacent first rectangular waveguides 3. The connection between the output of the power divider / combiner 51 and the input of the second bandpass filter 53 is a radial line structure. The second input end 52 is parallel to the axis of the beat wave power segment 1.

[0045] The beat wave synthesizer is used to synthesize high-power microwave beat waves of two different frequencies in the X-band into one channel for output. The input / output ports of the first bandpass filter 41 and the second bandpass filter 53 are both overmoded circular waveguides, and the input / output microwave modes are both TM01 mode.

[0046] In this embodiment, the number of the first rectangular waveguides 3 and the number of the second rectangular waveguides 511 are both 8. The outer chamfer radius of the right-angled bend of the first rectangular waveguide 3 is 27.87 mm, and the inner chamfer radius is 12.1 mm.

[0047] like Figure 4As shown, the thickness of the first radial line 11 is consistent with the narrow side of the BJ84 standard-sized rectangular waveguide. The radius of the first radial line 11 is 41.71 mm. Eight first rectangular waveguides 3 are evenly distributed circumferentially along the first radial line 11. To improve power handling, the intersection of the first radial line 11 and the first rectangular waveguide 3 is chamfered with a chamfer radius of 1 mm. The wide side of the BJ84 standard-sized rectangular waveguide is 28.5 mm, and the narrow side is 12.63 mm.

[0048] like Figure 7 As shown in the figure, the beat power segment 1 is a bilaterally symmetrical structure, with only the length of the matching section connecting the two ends of the filter being different. The dimensions of each part of the beat power segment are: the matching section radius r0 is 20mm, the length l 1p 15.6mm, l 2p The length l of the cone-shaped waveguide between the first connecting section and the second connecting section is 17.49 mm. gd is 30.1mm, the circular waveguide length l1 is 11.12mm, the circular waveguide radius r1 is 19.8mm, and the chamfer radius r at the connection between the circular waveguide and the mounting part is dj 9mm.

[0049] like Figure 5 As shown, the first circular waveguide and the fifth circular waveguide have the same size, with a radius r0 of 24.75 mm and a length l0 of 20 mm. The radius r 11 43.43mm, length l 11 is 26.63 mm; the radius of the third circular waveguide r 12 29.93mm, length l 12 is 15.92 mm; the radius of the fourth circular waveguide r 13 42.59mm, length l 13 The angle between the side and bottom of the frustum of the transition between two adjacent circular waveguides is 45 degrees. The first bandpass filter 41 has a passband of 9.3 GHz to 9.5 GHz and a stopband of 9.9 GHz to 10.1 GHz.

[0050] like Figure 6 As shown, the sixth and tenth circular waveguides have the same size, with radius r0 of 24.75 mm and length l0 of 20 mm. The radius r of the seventh circular waveguide is 21 25.63mm, length l 21 is 18.31 mm; the radius of the eighth circular waveguide r 22 42.27mm, length l 22 is 15.54 mm; the radius of the ninth circular waveguide r 23 29.49mm, length l 23The angle between the side and bottom of the frustum of the transition between two adjacent circular waveguides is 45 degrees. The second bandpass filter 53 has a stop band of 9.3 GHz to 9.5 GHz and a pass band of 9.9 GHz to 10.1 GHz.

[0051] like Figure 2 As shown, the beat wave synthesizer of this embodiment has an overall length of 647 mm. The output end 22 is a 20 mm long circular waveguide with a diameter of 49.5 mm. It transitions to a 42 mm diameter circular waveguide through a 30 mm long frustum-shaped waveguide and enters the second radial line. The thickness of the second radial line is 12.63 mm, and the outer diameter of the second radial line is 87 mm. Eight first rectangular waveguides 3 are evenly distributed around the circumference of the second radial line. The chamfer radius at the intersection of the first rectangular waveguide 3 and the second radial line is 1 mm. The waveguide diameter at the intersection from the second radial line to the short-circuit board is 42 mm. The front end of the short-circuit board is connected to a frustum with a bottom diameter of 27 mm and a top diameter of 4 mm. The chamfer radius at the connection between the bottom of the frustum and the short-circuit board waveguide is 3 mm. To meet the high power capacity requirement of 5 GW, the transition from the circular waveguide to the second radial line is chamfered, with a chamfer radius of 12.5 mm on one side and 9 mm on the other.

[0052] like Figure 8 As shown, the difference loss at 9.38 GHz and 9.97 GHz is less than 0.03 dB, the reflection coefficient at 9.38 GHz and 9.97 GHz is less than -20 dB, and the transmission coefficient from the first input end 42 to the second input end 52 and the transmission coefficient from the second input end 52 to the first input end 42 are both less than -30 dB.

[0053] The cross-sectional electric field distribution of the beat wave synthesizer at a frequency of 9.4 GHz and an injection power of 0.5 W is shown in the figure below. Figure 9 As shown, when converted to 5 GW, the maximum electric field on the wall is 620 kV / cm at the chamfer of the beat power segment. The electric field at the bend of the first rectangular waveguide 3 is 700 kV / cm. The electric field at the bottom of the resonant cavity of the first bandpass filter 41 is also high. Due to the injected power of 2.5 GW, the maximum field strength there is 566 kV / cm, allowing for smoothing during processing.

[0054] The cross-sectional electric field distribution of the beat wave synthesizer at a frequency of 10.0 GHz and an injection power of 0.5 W is shown in the figure below. Figure 10 As shown, when converted to 5 GW, the maximum electric field on the wall is 660 kV / cm at the chamfer of the short-circuit surface of the beat wave synthesis section. The electric field at the bend of the first rectangular waveguide 3 is 630 kV / cm.

[0055] Two microwaves of different frequencies are inputted from the first input unit and the second input unit respectively, and then synthesized into beat waves in the beat wave power section, and then outputted from the output unit through the first rectangular waveguide.

[0056] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any changes or substitutions within the technical scope disclosed in the present invention shall be covered by the scope of protection of the present invention. Therefore, the scope of protection of the present invention shall be subject to the scope of protection of the claims.

Claims

1. A dual-frequency high-power microwave beat-wave synthesizer, characterized in that: It comprises a beat wave power segment (1), an output unit (2) coaxial with the beat wave power segment (1), and a plurality of first rectangular waveguides (3) arranged between the beat wave power segment (1) and the output unit (2); One input end of the beat power segment (1) is connected to the output end of the first input unit (4), and the other input end is connected to the output end of the second input unit (5); The first input unit (4) includes a first bandpass filter (41), the input end of the first bandpass filter is a first input end (42), and the output end is connected to an input end of the beat power segment (1) for inputting high-power microwaves of a first frequency; The second input unit (5) includes a power divider (51), the input end of the power divider (51) is a second input end (52), and the output end is connected to the input end of the second band-pass filter (53); the output end of the second band-pass filter (53) is connected to the other input end of the beat wave power segment (1) for inputting high-power microwaves of a second frequency; The output unit (2) comprises a beat wave synthesis section (21), one end of the beat wave synthesis section (21) is set as a short-circuit surface, and the other end is an output end (22) for outputting microwave beat waves; The input ends of the plurality of first rectangular waveguides (3) are connected to the output end of the beat wave power segment (1), and the output end is connected to a side wall of one end of the beat wave synthesis segment (21) which is set as a short-circuit surface.

2. The dual-frequency high-power microwave beat wave synthesizer according to claim 1, characterized in that: The beat wave power segment (1) comprises a first connecting segment, a mounting portion, and a second connecting segment connected in sequence. The first connecting segment and the second connecting segment are symmetrically arranged, each comprising a frustum-shaped waveguide and a circular waveguide connected to the small end of the frustum-shaped waveguide at one end, the other end of the circular waveguide being connected to the mounting portion, and a chamfer being provided at the connection; the mounting portion comprises a first radial line (11), one end of the first radial line (11) being connected to the circular waveguide, and the other end being connected to one end of a first rectangular waveguide (3), the size of the first radial line (11) matching the size of the first rectangular waveguide (3); the large end of the frustum-shaped waveguide of the first connecting segment constitutes an input end of the beat wave power segment (1), the large end of the frustum-shaped waveguide of the second connecting segment constitutes the other input end of the beat wave power segment (1), and the other end of the first radial line (11) constitutes the output end of the beat wave power segment (1).

3. The dual-frequency high-power microwave beat wave synthesizer according to claim 2, wherein: The first band-pass filter (41) is coaxial with the beat wave power segment (1), and comprises a first circular waveguide (411), a second circular waveguide (412), a third circular waveguide (413), a fourth circular waveguide (414), and a fifth circular waveguide (415) connected in sequence, with frustum transitions between adjacent circular waveguides; the input end of the first circular waveguide (411) constitutes the input end of the first band-pass filter (41), and the output end of the fifth circular waveguide (415) constitutes the output end of the first band-pass filter (41).

4. The dual-frequency high-power microwave beat wave synthesizer according to claim 3, wherein: The second band-pass filter (53) is coaxial with the beat wave power segment (1), and comprises a sixth circular waveguide (531), a seventh circular waveguide (532), an eighth circular waveguide (533), a ninth circular waveguide (534), and a tenth circular waveguide (535) connected in sequence, with frustum transitions between adjacent circular waveguides; the input end of the sixth circular waveguide (531) constitutes the input end of the second band-pass filter (53), and the output end of the tenth circular waveguide (535) constitutes the output end of the second band-pass filter (53).

5. The dual-frequency high-power microwave beat wave synthesizer according to claim 2, characterized in that: The beat wave synthesis section (21) is coaxial with the beat wave power segment (1) and is spaced apart from the second bandpass filter (53), and comprises a first connection portion, a mounting section, a second connection portion and a transition section connected in sequence, wherein the first connection portion and the second connection portion are symmetrically arranged and each comprises a frustum-shaped waveguide and a circular waveguide, wherein the small end of the frustum-shaped waveguide is connected to one end of the circular waveguide, and a chamfer is provided at the connection, and the other end of the circular waveguide is connected to one end of the installation section, and the connection is transitioned through a chamfer; the installation section comprises a second radial line, wherein one end of the second radial line is connected to the circular waveguide, and the other end is respectively connected to the other end of a first rectangular waveguide (3), and the size of the second radial line matches the size of the first rectangular waveguide (3); the transition section is a circular waveguide, one end of which is an output end, and the other end is connected to the large end of the frustum-shaped waveguide; the large end of the frustum-shaped waveguide of the first connection portion constitutes a short-circuit surface of the beat wave synthesis section (21), and one end of the circular waveguide of the transition section constitutes the other end of the beat wave synthesis section (21), and is used for outputting microwave beat waves.

6. The dual-frequency high-power microwave beat wave synthesizer according to claim 5, characterized in that: The main sections of the plurality of first rectangular waveguides (3) are parallel to the axis of the beat wave power segment (1), and the input ends thereof are respectively connected to the other end of the first radial line (11) of the beat wave power segment (1), and the output ends thereof are respectively connected to the other end of the second radial line of the beat wave synthesis segment (21); and the outer turning point (31) of the main section of each first rectangular waveguide (3) is a right-angle turn, and the right-angle turn is provided with a chamfer.

7. The dual-frequency high-power microwave beat wave synthesizer according to claim 6, characterized in that: The power splitter (51) is perpendicular to the axis of the beat wave power segment (1), and comprises a plurality of second rectangular waveguides (511) located between the input end and the output end thereof, each second rectangular waveguide (511) being inserted between two adjacent first rectangular waveguides (3).

8. The dual-frequency high-power microwave beat wave synthesizer according to claim 1, wherein: The second input end (52) is parallel to the axis of the beat power segment (1).

9. The dual-frequency high-power microwave beat wave synthesizer according to claim 7, characterized in that: The number of the first rectangular waveguides (3) is 8.

10. The dual-frequency high-power microwave beat wave synthesizer according to claim 7, characterized in that: The number of the second rectangular waveguides (511) is 8.

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