Rectangular waveguide power combiner

Abstract

The invention discloses a rectangular waveguide power combiner. The synthesizer comprises a main waveguide power combining module and mutually symmetrical secondary waveguide power combining modules, the main waveguide power combining module comprises a first short arm waveguide and first branch arm waveguides which are symmetrical to each other; the first short-arm waveguide comprises a first step waveguide unit and a first width gradient waveguide unit coupled with the first step waveguide unit; each first branch arm waveguide comprises a first standard rectangular waveguide unit and a length gradient waveguide unit coupled with the first standard rectangular waveguide unit; each secondary waveguide power combination module comprises a second short arm waveguide and second branch arm waveguides which are symmetrical to each other; each second short-arm waveguide comprises a second width gradient waveguide unit; each second branch arm waveguide comprises a second step waveguide unit and a second standard rectangular waveguide unit coupled with the second step waveguide unit; and each second width gradient waveguide unit is correspondingly coupled with each first standard rectangular waveguide unit.

Description

Technical Field

[0001] The embodiments of the present invention relate to the field of signal transmission technology, and in particular to a rectangular waveguide power synthesizer. Background Art

[0002] Power amplifiers are mostly used at the end of radar and microwave communication system transmitters to increase output power. For RF and microwave power amplifiers, the indicators that need to be considered are gain, efficiency, and output power. When designing a solid-state microwave power amplifier, the power output of a single transistor in a high-frequency band is limited. If a higher output power is required, multiple transistors can be combined using power synthesis technology. There are many methods for power synthesis technology, and the most commonly used are microstrip lines and metal waveguide structures. Microstrip structures are easy to integrate, small in size, and flexible in design methods, but they have large losses and low power capacity. On the contrary, traditional metal waveguide structures are closed metal structures, have no dielectric loss and radiation loss, have high power capacity, and have good heat dissipation properties. Based on the above advantages, traditional metal waveguide power synthesizers have been widely used in many microwave wireless communication fields.

[0003] The main indicators of power combiners include return loss, amplitude consistency, output phase consistency, etc. In engineering applications, power combiners play a vital role in whether the system can operate normally. In solid-state power amplifiers, power combiners with low insertion loss and high power capacity metal waveguide structures are often used to achieve low energy loss and high power signal output. At present, the return loss of power combiners in the existing technology is high, and the amplitude consistency and output phase consistency are poor. Summary of the invention

[0004] The present invention provides a rectangular waveguide power synthesizer to achieve high-power synthesis of four-way input signals in the Ku band (14-18GHz), with simple structure processing, low loss, high power capacity, and good amplitude consistency and phase consistency.

[0005] To achieve the above objectives, an embodiment of the present invention provides a rectangular waveguide power combiner, which includes: a main waveguide power combiner module and a mutually symmetrical secondary waveguide power combiner module;

[0006] The main waveguide power combining module comprises a first short arm waveguide and first branch arm waveguides which are symmetrical to each other; the first short arm waveguide comprises a first step waveguide unit and a first gradually changing width waveguide unit coupled to the first step waveguide unit; each of the first branch arm waveguides comprises a first standard rectangular waveguide unit and a gradually changing length waveguide unit coupled to the first standard rectangular waveguide unit;

[0007] Each of the sub-waveguide power combining modules includes a second short arm waveguide and a second branch arm waveguide that is symmetrical to each other; each of the second short arm waveguides includes a second gradually changing width waveguide unit; each of the second gradually changing width waveguides includes a second stepped waveguide unit and a second standard rectangular waveguide unit coupled to the second stepped waveguide unit; each of the second gradually changing width waveguide units is coupled to each of the first standard rectangular waveguide units;

[0008] The first short arm waveguide is impedance matched with each of the gradually changing length waveguide units; in any of the sub-waveguide power combining modules, the second gradually changing width waveguide unit is impedance matched with each of the second stepped waveguide units.

[0009] Optionally, the first stepped waveguide unit includes at least three levels of first stepped waveguide sub-units; wherein the widths of the first stepped waveguide sub-units are the same; along the extension direction of the first short arm waveguide, the heights of the first stepped waveguide sub-units increase in sequence from a standard height; and the height of the first standard rectangular waveguide unit is the standard height;

[0010] The first gradually-varying-width waveguide unit comprises at least three levels of first-width waveguide subunits; the heights of the first-width waveguide subunits are the same and are the highest heights of the first step waveguide subunits; along the extending direction of the first short arm waveguide, the widths of the first-width waveguide subunits decrease in sequence from the standard width; the width of the first standard rectangular waveguide unit is the standard width;

[0011] The length-varying waveguide unit includes at least three levels of length-varying waveguide sub-units; each of the length-varying waveguide sub-units has the same height and is the standard height; along the extension direction of the first short arm waveguide, the length of each of the length-varying waveguide sub-units increases sequentially.

[0012] Optionally, the second gradually-varying-width waveguide unit comprises at least three levels of second-width waveguide subunits; wherein the heights of the second-width waveguide subunits are the same and are the standard height; and the widths of the second-width waveguide subunits decrease in sequence along the extending direction of the first short arm waveguide;

[0013] The second stepped waveguide unit includes at least four levels of second step waveguide sub-units; the widths of the second step waveguide sub-units are the same; along the extension direction perpendicular to the first short arm waveguide, the heights of the second step waveguide sub-units decrease in sequence from the standard height.

[0014] Optionally, the first step waveguide subunit includes a first chamfered step waveguide subunit; the first width waveguide subunit includes a first chamfered width waveguide subunit.

[0015] Optionally, the second width waveguide subunit includes a second chamfered width waveguide subunit; and the second step waveguide subunit includes a second chamfered step waveguide subunit.

[0016] Optionally, the standard height H0 satisfies: 7.87mm≤H0≤7.93mm.

[0017] Optionally, the maximum height H of the first step waveguide subunit satisfies: 9mm≤H≤9.2mm.

[0018] Optionally, the standard width w0 satisfies: 15.77mm≤w0≤15.83mm.

[0019] Optionally, the material of the main waveguide power combining module is: metal material.

[0020] Optionally, the material of the sub-waveguide power combining module is: metal material.

[0021] In an embodiment of the present invention, when four RF input signals are transmitted to two second width gradient waveguide units through four second standard rectangular waveguide units and four second stepped waveguide units, four equal-amplitude and same-direction RF input signals are synthesized in pairs; the two synthesized output RF signals are then transmitted to the first short arm waveguide composed of the first stepped waveguide unit and the first width gradient waveguide unit through two first standard rectangular waveguide units and two length gradient waveguide units, and the two RF input signals are then power synthesized and output, thereby realizing power synthesis of the four input RF signals; since the first stepped waveguide unit, the first width gradient waveguide unit and the length gradient waveguide units are impedance matched; the second width gradient waveguide unit corresponds to the impedance matching of the second stepped waveguide units, thereby reducing the loss of power transmission, realizing high-power synthesis of the four input signals in the Ku band (14-18GHz), and high power capacity output.

[0022] It should be understood that the contents described in this section are not intended to identify the key or important features of the embodiments of the present invention, nor are they intended to limit the scope of the present invention. Other features of the present invention will become easily understood through the following description. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0024] Figure 1 is a schematic diagram of a three-dimensional structure of a rectangular waveguide power combiner provided by an embodiment of the present invention;

[0025] Figure 2 is a schematic diagram of a top view of a rectangular waveguide power combiner provided by an embodiment of the present invention;

[0026] Figure 3 It is a schematic diagram of return loss outputted by a first short arm waveguide of a rectangular waveguide power combiner provided in an embodiment of the present invention;

[0027] Figure 4 is a schematic diagram of field intensity distribution of a rectangular waveguide power combiner provided by an embodiment of the present invention;

[0028] Figure 5 This is a diagram showing the effect of consistent signal amplitude output by four second standard rectangular waveguide units in a rectangular waveguide power combiner provided by an embodiment of the present invention;

[0029] Figure 6 This is a diagram showing the effect of signal phase consistency output by four second standard rectangular waveguide units in a rectangular waveguide power combiner provided by an embodiment of the present invention;

[0030] Figure 7 It is a schematic diagram of the 3D structure of another rectangular waveguide power combiner provided in an embodiment of the present invention.

[0031] Figure 8 yes Figure 7 A schematic diagram of the partially enlarged structure of the second width waveguide subunit C and the second step waveguide subunit D. DETAILED DESCRIPTION

[0032] In order to enable those skilled in the art to better understand the scheme of the present invention, the technical scheme in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present invention.

[0033] It should be noted that the terms "first", "second", etc. in the specification and claims of the present invention and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the data used in this way can be interchanged where appropriate, so that the embodiments of the present invention described herein can be implemented in an order other than those illustrated or described herein. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions, for example, a process, method, system, product or device that includes a series of steps or units is not necessarily limited to those steps or units that are clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0034] Figure 1 is a schematic diagram of a three-dimensional structure of a rectangular waveguide power combiner provided by an embodiment of the present invention, Figure 2 FIG. 1 is a schematic diagram of a top view of a rectangular waveguide power combiner provided by an embodiment of the present invention. Figure 1-2 As shown, the rectangular waveguide power combiner includes: a main waveguide power combiner module 10 and a secondary waveguide power combiner module 20 which are symmetrical to each other;

[0035] The main waveguide power combining module 10 includes a first short arm waveguide 11 and first branch arm waveguides 12 that are symmetrical to each other; the first short arm waveguide 11 includes a first stepped waveguide unit 111 and a first gradually-varying width waveguide unit 112 coupled to the first stepped waveguide unit 111; each first branch arm waveguide 12 includes a first standard rectangular waveguide unit 121 and a gradually-varying length waveguide unit 122 coupled to the first standard rectangular waveguide unit 121;

[0036] Each sub-waveguide power combining module 20 includes a second short arm waveguide 21 and second branch arm waveguides 22 that are symmetrical to each other; each second short arm waveguide 21 includes a second gradually-varying width waveguide unit 211; each second gradually-varying width waveguide unit 222 includes a second stepped waveguide unit 221 and a second standard rectangular waveguide unit 222 coupled to the second stepped waveguide unit 221; each second gradually-varying width waveguide unit 211 is coupled to each first standard rectangular waveguide unit 121;

[0037] The first short arm waveguide 11 is impedance matched with each length gradient waveguide unit 122 ; in any waveguide power combining module 20 , the second width gradient waveguide unit 211 is impedance matched with each second step waveguide unit 221 .

[0038] In the prior art, the first short arm waveguide 11 and the mutually symmetrical first branch arm waveguides 12 are both continuous structures (non-step and non-gradient structures), and the impedance matching of the first short arm waveguide 11 and the mutually symmetrical first branch arm waveguides 12 is poor. When the radio frequency signal passes through the first short arm waveguide 11 and enters each first branch arm waveguide 12, a large amount of transmission signals will be generated, resulting in a large amount of insertion loss, which will reduce the total power output from each first branch arm waveguide 12;

[0039] In this embodiment, when four RF input signals are transmitted to two second width gradient waveguide units 211 through four second standard rectangular waveguide units 222 and four second stepped waveguide units 221, the four RF input signals are synthesized in pairs; the two synthesized output RF signals are then transmitted to the first short arm waveguide 11 composed of the first stepped waveguide unit 111 and the first width gradient waveguide unit 112 through two first standard rectangular waveguide units 121 and two length gradient waveguide units 122, and the two RF input signals are then power synthesized and output, thereby realizing power synthesis of the four input RF signals;

[0040] Since the second width gradient waveguide unit 211 and each second step waveguide unit 221 in any waveguide power combining module 20 are both discontinuous structures, the second width gradient waveguide unit 211 in any waveguide power combining module 20 corresponds to the impedance matching of each second step waveguide unit 221; thus, when four RF input signals are transmitted to two second width gradient waveguide units 211 through four second standard rectangular waveguide units 222 and four second step waveguide units 221, the four RF input signals are synthesized in pairs; the power loss of the synthesized two RF signals is low, and the power output of the synthesized two RF signals is high; at the same time, since the first step waveguide unit 11 1. The main waveguide module 10 composed of the first gradually changing width waveguide unit 112 and each first branch arm waveguide 12 composed of each gradually changing length waveguide unit 122 are non-continuous structures. At the same time, the main waveguide module 10 composed of the first stepped waveguide unit 111 and the first gradually changing width waveguide unit 112 are impedance matched with each gradually changing length waveguide unit 122. In this way, the two RF signals are correspondingly transmitted to the first short arm waveguide 11 composed of the first stepped waveguide unit 111 and the first gradually changing width waveguide unit 112 through the two first standard rectangular waveguide units 121 and the two gradually changing length waveguide units 122. The two RF input signals are then power synthesized and output, and the power loss of the synthesized signal is low ( Figure 3 Schematic diagram of return loss of a first short arm waveguide output of a rectangular waveguide power combiner provided in an embodiment of the present invention; Figure 3The overall return loss of the rectangular waveguide power combiner is less than -19dB in the entire operating frequency band, thus achieving high-power synthesis of four-way input signals in the Ku band (14-18GHz) and high power capacity output ( Figure 4 Schematic diagram of field intensity distribution of a rectangular waveguide power combiner provided by an embodiment of the present invention; Figure 4 , the field strength of the first short arm waveguide of the rectangular waveguide power combiner is significantly higher than the field strength of the second branch arm waveguide of the rectangular waveguide power combiner). At the same time, since the second width gradient waveguide unit 211 and each second step waveguide unit 221 in any waveguide power combiner module 20 are discontinuous structures, since the main waveguide module 10 composed of the first step waveguide unit 111 and the first width gradient waveguide unit 112 and each first branch arm waveguide 12 composed of each length gradient waveguide unit 122 are discontinuous structures, the cross-sectional dimensions of each unit vary in the signal transmission direction, so that the combiner can adapt to a wide range of frequencies, that is, it can also widen the bandwidth.

[0041] It should be noted that when a single signal is input to the first short arm waveguide 11 in the main waveguide module 10 of the rectangular waveguide power synthesizer, the signal is divided into two signals after passing through the two first branch arm waveguides 12; the two signals are then divided into four signals through the second short arm waveguide 21, and the four signals are output through the four second branch arm waveguides 22, thus achieving signal separation; similarly, due to the impedance matching of the first step waveguide unit 111, the first width gradient waveguide unit 112 and each length gradient waveguide unit 122; the second width gradient waveguide unit 211 corresponds to the impedance matching of each second step waveguide unit 221, thus reducing the power transmission loss, and at the same time, due to the symmetrical arrangement of each waveguide in the rectangular waveguide power synthesizer, the equal amplitude separation of the signal is achieved, and the output amplitude consistency of the four signals is achieved ( Figure 5 : is a diagram showing the effect of consistent signal amplitude output by four second standard rectangular waveguide units in a rectangular waveguide power combiner provided by an embodiment of the present invention; Figure 5 , the output amplitude imbalance of the four-way signal of the rectangular waveguide power combiner is less than ±0.3dB). In addition, the signal transmission path is related to the phase of the signal; in this embodiment, due to the symmetrical arrangement of the waveguides in the rectangular waveguide power combiner, the lengths of the signal transmission paths are the same, and the phase consistency of the output four-way signal can also be ensured ( Figure 6 : is a diagram showing the effect of phase consistency of signals output by four second standard rectangular waveguide units in a rectangular waveguide power combiner provided by an embodiment of the present invention; Figure 6, the phase imbalance of the four signals of the rectangular waveguide power synthesizer is less than ±3°. For example, at the same frequency of 15.3 Hz, the difference between the maximum phase 114.42° and the minimum phase 113.98° in the four second standard rectangular waveguide units is 0.44°, that is, the phase imbalance is 0.44°; at the same frequency of 16.12 Hz, the difference between the maximum phase 136.06° and the minimum phase 135.81° in the four second standard rectangular waveguide units is 0.25°, that is, the phase imbalance is 0.25°).

[0042] Optionally, based on the above embodiments, the specific structure of each waveguide is described; continue to refer to Figure 1-2 , the first stepped waveguide unit 111 includes at least three first stepped waveguide subunits A; wherein the width w1 of each first stepped waveguide subunit A is the same; along the extension direction x of the first short arm waveguide 11, the height h1 of each first stepped waveguide subunit A increases sequentially from the standard height H0; the height h2 of the first standard rectangular waveguide unit 121 is the standard height;

[0043] The first gradually-varying-width waveguide unit 112 includes at least three levels of first-width waveguide subunits B; the height h3 of each first-width waveguide subunit B is the same and is the highest height H of the first step waveguide subunit; along the extension direction x of the first short arm waveguide, the width w2 of each first-width waveguide subunit B decreases in sequence from the standard width w0; the width w3 of the first standard rectangular waveguide unit 121 is the standard width;

[0044] The length-varying waveguide unit 122 includes at least three levels of length-varying waveguide subunits C; each length-varying waveguide subunit C has the same height h4 and is a standard height; along the extension direction x of the first short arm waveguide, the length l1 of each length-varying waveguide subunit C increases sequentially.

[0045] Among them, the standard height H0 can satisfy 7.87mm≤H0≤7.93mm; the standard width w0 can satisfy: 15.77mm≤w0≤15.83mm; the first step waveguide unit 111 is designed as a multi-level first step waveguide sub-unit A; the first width gradient waveguide unit 112 is designed as a multi-level first width waveguide sub-unit B; and the length gradient waveguide unit 122 is designed as a multi-level length gradient waveguide sub-unit C, so that the first short arm waveguide 11 composed of the first step waveguide unit 111 and the first width gradient waveguide unit 112 can be well impedance matched with the two length gradient waveguide units 122, thereby reducing the return loss, so that the two RF input signals output from the two waveguide modules 20 are power synthesized and output again, and the power loss of the synthesized signal is low.

[0046] In actual design, the impedance matching result can be changed by changing the increase in the height h1 of each first step waveguide subunit A, or by changing the decrease in the width w2 of each first width waveguide subunit B, or by changing the increase in the length l1 of each length gradient waveguide subunit C, so as to adjust the return loss to a lower value. This embodiment does not make specific restrictions on this, and each change amount can be determined according to the size of the return loss required; preferably, the highest height H of the first step waveguide subunit satisfies: 9≤H≤9.2mm.

[0047] Optional, continue to refer to Figure 1-2 The second width gradient waveguide unit 211 includes at least three levels of second width waveguide subunits D; wherein the height h5 of each second width waveguide subunit D is the same and is a standard height; along the extension direction x of the first short arm waveguide, the width w4 of each second width waveguide subunit D decreases in sequence;

[0048] The second stepped waveguide unit 221 includes at least four second stepped waveguide subunits E; the width w5 of each second stepped waveguide subunit E is the same; along the direction x perpendicular to the extension direction of the first short arm waveguide, the height h6 of each second step waveguide subunit decreases from the standard height in sequence.

[0049] The second width gradient waveguide unit 211 is designed as a multi-level second width waveguide sub-unit D, and the second step waveguide unit 221 is designed as a multi-level second step waveguide sub-unit E, so that the second width gradient waveguide unit 211 and the second step waveguide unit 221 can be well impedance matched, so that the four-way RF input signals are synthesized in pairs; the power loss of the synthesized two-way RF signals is low, and the power output of the synthesized two-way RF signals is high;

[0050] Similarly, in actual design, the impedance matching result can be changed by changing the reduction amount of the width w4 of each second width waveguide subunit D, or by changing the height reduction amount of each second step waveguide subunit, so as to adjust the return loss to a lower amount. This embodiment does not make specific limitations on this, and each change amount can be determined according to the size of the return loss required.

[0051] Optional, Figure 7 is a schematic diagram of a three-dimensional structure of another rectangular waveguide power combiner provided by an embodiment of the present invention, Figure 8 yes Figure 7 A schematic diagram of the partially enlarged structure of the second width waveguide subunit C and the second step waveguide subunit D; Figure 7-8As shown, the second width waveguide subunit C includes a second chamfered width waveguide subunit (including a chamfered area C11); the second step waveguide subunit D includes a second chamfered step waveguide subunit (including a chamfered area D11); the first step waveguide subunit A includes a first chamfered step waveguide subunit (not shown in the figure); the first width waveguide subunit B includes a first chamfered width waveguide subunit (not shown in the figure); wherein, the first step waveguide subunit A is designed as a first chamfered step waveguide subunit, and the first width waveguide subunit B is designed as a first chamfered width waveguide subunit; the second width waveguide subunit C is designed as a second chamfered width waveguide subunit; and the second step waveguide subunit D is designed as a second chamfered step waveguide subunit, which can facilitate the later processing and milling, and can further reduce the reflection of electromagnetic waves during the transmission process.

[0052] Optional, continue to refer to Figure 1-2 and Figure 7-8 , the material of the main waveguide power combiner module 10 is: metal material; the material of the secondary waveguide power combiner module 20 is: metal material. Among them, the advantage of using metal materials for the main waveguide power combiner module 10 and the secondary waveguide power combiner module 20 is that: the conductivity of the rectangular waveguide power combiner can be improved, so that the signal transmission in the high frequency band of the Ku band can be well performed; preferably, the conductivity ρ of the metal material satisfies: 10^5S / m≤ρ≤10^7S / m; such as: the metal material can be selected as copper material, or aluminum material and other materials with higher conductivity; in some other embodiments, the surface of the main waveguide power combiner module 10 and each secondary waveguide power combiner module 20 can also be gold-plated, so as to improve the conductivity of the waveguide port of the rectangular waveguide power combiner, and at the same time improve the corrosion resistance and oxidation resistance of the rectangular waveguide power combiner.

[0053] Note that the above are only preferred embodiments of the present invention and the technical principles used. Those skilled in the art will understand that the present invention is not limited to the specific embodiments described herein, and that various obvious changes, readjustments and substitutions can be made by those skilled in the art without departing from the scope of protection of the present invention. Therefore, although the present invention has been described in more detail through the above embodiments, the present invention is not limited to the above embodiments, and may include more other equivalent embodiments without departing from the concept of the present invention, and the scope of the present invention is determined by the scope of the appended claims.

Claims

1. A rectangular waveguide power combiner, characterized in that: include: A main waveguide power combining module and mutually symmetrical secondary waveguide power combining modules; The main waveguide power combining module comprises a first short arm waveguide and first branch arm waveguides which are symmetrical to each other; the first short arm waveguide comprises a first step waveguide unit and a first gradually changing width waveguide unit coupled to the first step waveguide unit; each of the first branch arm waveguides comprises a first standard rectangular waveguide unit and a gradually changing length waveguide unit coupled to the first standard rectangular waveguide unit; Each of the sub-waveguide power combining modules includes a second short arm waveguide and a second branch arm waveguide that is symmetrical to each other; each of the second short arm waveguides includes a second gradually changing width waveguide unit; each of the second gradually changing width waveguides includes a second stepped waveguide unit and a second standard rectangular waveguide unit coupled to the second stepped waveguide unit; each of the second gradually changing width waveguide units is coupled to each of the first standard rectangular waveguide units; The first short arm waveguide is impedance matched with each of the gradually changing length waveguide units; in any of the sub-waveguide power combining modules, the second gradually changing width waveguide unit is impedance matched with each of the second stepped waveguide units.

2. The rectangular waveguide power combiner according to claim 1, characterized in that: The first stepped waveguide unit includes at least three first stepped waveguide subunits; wherein the widths of the first stepped waveguide subunits are the same; along the extension direction of the first short arm waveguide, the heights of the first stepped waveguide subunits increase in sequence from a standard height; the height of the first standard rectangular waveguide unit is the standard height; The first gradually-varying-width waveguide unit comprises at least three levels of first-width waveguide subunits; the heights of the first-width waveguide subunits are the same and are the highest heights of the first step waveguide subunits; along the extending direction of the first short arm waveguide, the widths of the first-width waveguide subunits decrease in sequence from the standard width; the width of the first standard rectangular waveguide unit is the standard width; The length-varying waveguide unit includes at least three levels of length-varying waveguide sub-units; each of the length-varying waveguide sub-units has the same height and is the standard height; along the extension direction of the first short arm waveguide, the length of each of the length-varying waveguide sub-units increases sequentially.

3. The rectangular waveguide power combiner according to claim 2, characterized in that: The second gradually-varying-width waveguide unit comprises at least three levels of second-width waveguide subunits; wherein the heights of the second-width waveguide subunits are the same and are the standard heights; and the widths of the second-width waveguide subunits decrease in sequence along the extending direction of the first short arm waveguide; The second stepped waveguide unit includes at least four levels of second step waveguide sub-units; the widths of the second step waveguide sub-units are the same; along the extension direction perpendicular to the first short arm waveguide, the heights of the second step waveguide sub-units decrease in sequence from the standard height.

4. The rectangular waveguide power combiner according to claim 2, characterized in that: The first step waveguide subunit includes a first chamfered step waveguide subunit; the first width waveguide subunit includes a first chamfered width waveguide subunit.

5. The rectangular waveguide power combiner according to claim 3, characterized in that: The second width waveguide subunit includes a second chamfered width waveguide subunit; and the second step waveguide subunit includes a second chamfered step waveguide subunit.

6. The rectangular waveguide power combiner according to claim 2, characterized in that: The standard height H0 satisfies: 7.87 mm ≤ H0 ≤ 7.93 mm.

7. The rectangular waveguide power combiner according to claim 2, characterized in that: The maximum height H of the first step waveguide subunit satisfies: 9mm≤H≤9.2mm.

8. The rectangular waveguide power combiner according to claim 2, characterized in that: The standard width w0 satisfies: 15.77 mm ≤ w0 ≤ 15.83 mm.

9. The rectangular waveguide power combiner according to claim 1, characterized in that: The material of the main waveguide power combining module is: metal material.

10. The rectangular waveguide power combiner according to claim 1, characterized in that: The material of the sub-waveguide power combining module is: metal material.

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