A radial power combiner based on E-plane

Abstract

The present invention provides a radial power synthesizer based on an E-plane, the synthesizer includes a radial combining unit, a combining step waveguide unit, a microstrip to waveguide conversion circuit, and a coaxial to ridge waveguide unit; the combining rectangular branch structure is arranged radially symmetrically with the axis of the combining cylindrical waveguide as the axis; part of each of the two adjacent combining rectangular branch structures is covered by a third combining cylindrical waveguide; the microstrip to waveguide conversion circuit is used to receive a radio frequency signal, and transmit the signal to the combining step waveguide unit by means of a microstrip to waveguide; the combining step waveguide unit is used to convert the vertically transmitted signal transmission to the horizontal direction and transmit it to the combining rectangular branch structure. The overall structure of the radial power synthesizer provided by the present invention has a high degree of symmetry, resulting in a high degree of symmetry of the electromagnetic field in the transmission direction, so that the loss of the synthesizer is low, and secondly, the isolation between the branch structures is good, and no additional isolator is required, which can reduce the manufacturing cost.

Description

Technical Field

[0001] The present invention relates to the field of communications, and more particularly to an E-plane-based radial power combiner. Background Art

[0002] With the rapid development of the electronic information industry, the communication industry is developing rapidly. In the field of satellite communications, the requirements for the transmission system are getting higher and higher, and the power synthesis technology needs to meet the needs of its system;

[0003] Satellite communications are widely used in national defense construction, personal mobile communications, aerospace communications and other broad fields. Due to the limitations of process and heat dissipation conditions, the commonly used single power amplifier tube is far from meeting the power requirements of modern power amplifiers, and power synthesis has become a necessary condition for high-power power amplifiers. High-power power amplifiers have longer transmission distances and larger information capacity with large bandwidths. The demand for high power and large bandwidth is a development trend. The commonly used power synthesis methods are planar binary synthesis, spatial power synthesis, and radial waveguide synthesis.

[0004] Planar binary synthesis usually uses microstrip lines to transmit RF signals. To achieve ultra-wideband design, multiple impedance transformations are required. Microstrip lines require longer line lengths, which will increase conductor loss and dielectric loss. As the number of synthesis increases, the traditional planar synthesis loss is too large, which limits the use of high-power synthesis methods.

[0005] Spatial power synthesis is based on the design technology of low-loss broadband waveguide fin antenna array. Since broadband matching circuits usually use multi-stage matching to widen the bandwidth, a long transmission line is required when the frequency band is very wide. In addition, the spatial power synthesis of waveguide fin antenna array has poor isolation between channels, limited heat dissipation methods and working bandwidth, which limits the use of broadband high-power synthesis methods.

[0006] Radial waveguide power synthesis refers to the power synthesis of multiple microwave signals in the space within the waveguide cavity, which fully utilizes the characteristics of low waveguide loss and the advantages of flexible waveguide impedance transformation to achieve multi-channel and high-efficiency power synthesis. However, the previous radial waveguide synthesizer technology has the following disadvantages:

[0007] 1. The isolation between channels is poor and the standing wave of the sub-port is poor. To solve this problem, isolators have to be used when connecting the power amplifier units to avoid crosstalk and self-excitation. This reduces the efficiency of power amplifier synthesis and is not conducive to high-power power amplifier synthesis.

[0008] 2. Most high-power amplifier units have to use E-plane synthesis due to heat dissipation restrictions. When the H-plane-based radial waveguide synthesizer is connected to the amplifier unit, it is necessary to perform H-plane to E-plane conversion, so there will be a superposition of E-plane plus H-plane in the height direction. When the power amplifier works in the frequency band below ka, due to the large size of the waveguide, the H-plane-based radial waveguide synthesizer is not conducive to the miniaturization and integration trend required by the market, so it is limited to a certain extent in the communication field. Summary of the invention

[0009] The present invention aims to overcome at least one defect of the above-mentioned prior art and provide a radial power combiner based on E-plane to solve the problems that the existing radial waveguide combiner has poor isolation effect and the application scope of the radial waveguide combiner based on H-plane is limited.

[0010] The technical solution adopted by the present invention includes:

[0011] In the first aspect, the present invention provides an E-plane-based radial power combiner, comprising a radial combining unit, a combining step waveguide unit, a microstrip and waveguide conversion circuit, and a coaxial ridge waveguide unit; the radial combining unit comprises at least a first combining cylindrical waveguide, a second combining cylindrical waveguide and a third combining cylindrical waveguide coaxially arranged, and a plurality of combining rectangular branch structures; each combining rectangular branch structure is radially symmetrically arranged with the axis of the combining cylindrical waveguide as the axis, and is composed of a first combining rectangular waveguide branch and a second combining rectangular waveguide branch; in each combining rectangular branch structure, the position of the first combining rectangular waveguide branch is closer to the combining cylindrical waveguide than the second combining rectangular waveguide branch; a portion between two adjacent combining rectangular branch structures is covered by the third combining cylindrical waveguide; each The end of the combined rectangular branch structure away from the combined cylindrical waveguide is connected to a combined step waveguide unit and a microstrip to waveguide conversion circuit; the microstrip to waveguide conversion circuit is used to receive the radio frequency signal and transmit the signal to the combined step waveguide unit by means of the microstrip to waveguide; the combined step waveguide unit is used to convert the vertically transmitted signal to the horizontal direction and transmit it to the combined rectangular branch structure; the signal transmitted by each combined rectangular branch structure is combined into one signal at the combined cylindrical waveguide, and is transmitted to the coaxial to ridge waveguide unit after sequentially passing through the third combined cylindrical waveguide, the second combined cylindrical waveguide and the first combined cylindrical waveguide; the coaxial to ridge waveguide unit is coaxially arranged with the combined cylindrical waveguide, and is used to convert the coaxial signal combined by the radial combining unit into a standard rectangular waveguide and output it.

[0012] The present invention provides a radial power combiner. In order to solve the limitations of a combiner based on an H-plane, the radial power combiner is designed based on an E-plane, and includes a radial combining unit composed of a completely symmetrical combining rectangular branch structure and a plurality of symmetrical cylindrical waveguides, a coaxial ridge waveguide unit connected to the radial combining unit, and a combining step waveguide unit and a microstrip-to-waveguide conversion circuit connected to each combining rectangular branch structure. Each combining rectangular branch structure receives a signal, and through a microstrip-to-waveguide conversion circuit, an electromagnetic field is synthesized in a waveguide and then propagated. Through the microstrip-to-waveguide mode, the conversion of electromagnetic propagation from a plane to space can be realized, and the advantage of good heat dissipation of planar electromagnetic propagation can be inherited, and it is also conducive to integration with an external driving stage circuit, thereby realizing high integration within a small volume range, and the combining step waveguide unit converts the vertically transmitted signal into horizontal transmission, effectively realizing rectangular waveguide TE10 mode transmission with a broadband working bandwidth. Part of the adjacent combined rectangular branch structures are covered by the third combined cylindrical waveguide, thereby realizing the isolation port between the combined rectangular branch structures, making the port isolation between the combined rectangular branch structures higher and independent of each other. Finally, the signal of each combined rectangular branch structure is synthesized into one signal, which is input into the coaxial ridge waveguide unit after passing through the combined cylindrical waveguide. The coaxial ridge waveguide unit converts the mode of the coaxial waveguide from the TEM mode of the coaxial line to the TE10 mode of the waveguide by means of E-surface excitation. The overall structure of the radial power synthesizer provided by the present invention has high symmetry, resulting in the electromagnetic field having a high degree of symmetry in the transmission direction, which is not affected by the change of the electromagnetic field during the transmission of the TEM wave, so that the loss of the synthesizer is low, and at the same time, the phases of each branch port are the same and the amplitudes are equal during power synthesis. The isolation between the combined rectangular branch structures of the synthesizer is good, and no additional isolator is required, which can reduce the production cost.

[0013] Furthermore, the coaxial ridge-turned waveguide unit includes a coaxial metal cylinder, three-level metal steps and a standard waveguide connected in sequence.

[0014] The combined coaxial signal passing through the cylindrical waveguide is converted into a standard rectangular waveguide after passing through the coaxial metal cylinder, three-level metal steps and standard waveguide in sequence, completing the conversion between TEM mode and TM10 mode. The coaxial ridge waveguide unit of this structure has low loss, wide bandwidth and compact structure, which can be easily processed in an integrated manner.

[0015] Furthermore, the microstrip to waveguide conversion circuit includes a 1 / 4 wavelength reflection cavity, a microstrip probe unit and a standard waveguide.

[0016] The input signal first enters through the microstrip probe unit, enters the 1 / 4 wavelength reflection cavity through the microstrip probe unit, and finally enters the standard waveguide for synthesis and output. The microstrip to waveguide conversion circuit inserts the microstrip probe unit deep into the standard waveguide, and synthesizes the electromagnetic field in the waveguide and propagates it through the microstrip to waveguide method. The insertion loss of the electromagnetic field propagating in the waveguide is very small. Through the microstrip to waveguide method, it can not only realize the conversion of electromagnetic propagation from plane to space, but also inherit the advantages of good heat dissipation of planar electromagnetic propagation, and it is also conducive to integration with the external driver circuit, thereby achieving high integration within a small volume.

[0017] Furthermore, the combining step waveguide unit is composed of three-level step waveguides.

[0018] In the combined step waveguide unit, the input signal enters the highest-level step waveguide vertically, passes through the three-level step waveguide input combined rectangular branch structure, and is converted to horizontal transmission in the combined rectangular branch structure. By adjusting the three-level step waveguide, the rectangular waveguide with broadband working bandwidth can be effectively transmitted in TE10 mode.

[0019] Furthermore, the radial combining unit further includes a fourth combining cylindrical waveguide and a fifth combining cylindrical waveguide which are coaxially arranged.

[0020] The signal does not pass through the fourth combining cylindrical waveguide and the fifth combining cylindrical waveguide during transmission, but the setting of the radius length and height of the fourth and fifth combining cylindrical waveguides can improve the matching of the entire radial combining unit and eliminate the influence of high-order modes in the rectangular waveguide and coaxial ridge waveguide units.

[0021] Furthermore, the coaxial metal cylinder includes a first cylinder, a second cylinder and an air cavity; the width of the second cylinder is the same as that of the air cavity, and a section of the first cylinder is spaced between the air cavity and the second cylinder.

[0022] The first cylinder is a waveguide-to-coaxial, and the signal is transmitted along the surface of the first cylinder to the second cylinder.

[0023] Furthermore, the resistance of the first cylinder segment is 50 ohms.

[0024] Furthermore, the standard waveguide is a WR159 waveguide.

[0025] Compared with the prior art, the present invention has the following beneficial effects:

[0026] The present invention provides a radial power synthesizer based on an E-plane. The design based on the E-plane can solve the limitations brought by the synthesizer based on the H-plane, has great advantages in integration and miniaturization, and can be directly integrated with the subsequent circuit in the same plane. Wherein, the power synthesizer includes a radial unit composed of a completely symmetrical rectangular branch structure and a plurality of symmetrical cylindrical waveguides, a coaxial ridge waveguide unit connected to the radial unit, and a step waveguide unit and a microstrip to waveguide conversion circuit connected to each rectangular branch structure. The microstrip to waveguide conversion circuit can realize the conversion of electromagnetic propagation from plane to space by means of microstrip to waveguide, and can inherit the advantages of good heat dissipation of planar electromagnetic propagation, and is also conducive to integration with an external driving stage circuit, thereby realizing high integration within a small volume. Parts of adjacent rectangular branch structures are covered by a third cylindrical waveguide, thereby realizing isolated ports between rectangular branch structures, and the port isolation between rectangular branch structures is higher and independent of each other, without the need to add additional isolators, even if the power amplifier matched with it is damaged, other power amplifiers can still work, and the output power of the synthesizer decreases by a certain proportion. The overall structure of the radial power combiner provided by the present invention has high symmetry, resulting in a high degree of symmetry of the electromagnetic field in the transmission direction, which is not affected by changes in the electromagnetic field during TEM wave transmission, resulting in lower losses for the combiner, and also making the phases and amplitudes of each branch port the same during power synthesis. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is a schematic diagram of the three-dimensional structure of the radial power combiner based on the E-plane in Example 1 of the present invention.

[0028] Figure 2 It is a schematic diagram of the back structure of the radial power combiner based on the E-plane in Example 1 of the present invention.

[0029] Figure 3 It is another back side structural schematic diagram of the radial power combiner based on the E plane in Embodiment 1 of the present invention.

[0030] Figure 4 Schematic diagram of the structure of the coaxial metal cylinder 303 in Example 1 of the present invention.

[0031] Figure 5 Schematic diagram of the isolation of each combining rectangular branch structure 400 of the power combiner in Embodiment 1 of the present invention.

[0032] Figure 6 Schematic diagram of return loss at the common end of the power combiner in Example 1 of the present invention. DETAILED DESCRIPTION

[0033] The drawings of the present invention are only for illustrative purposes and should not be construed as limiting the present invention. In order to better illustrate the following embodiments, some parts of the drawings may be omitted, enlarged or reduced, and do not represent the size of the actual product; it is understandable to those skilled in the art that some well-known structures and their descriptions in the drawings may be omitted.

[0034] Example 1

[0035] This embodiment provides a radial power combiner based on an E-plane. The combiner includes a radial combining unit 100 , a coaxial ridge waveguide unit 300 , a combining step waveguide unit 500 , and a microstrip to waveguide conversion circuit 600 .

[0036] like Figure 1 As shown, the radial combining unit 100 at least includes a first combining cylindrical waveguide 101 , a second combining cylindrical waveguide 102 and a third combining cylindrical waveguide 103 which are coaxially arranged, and a plurality of combining rectangular branch structures 400 .

[0037] In a preferred embodiment, Figure 3 As shown, the radial combining unit 100 further includes a fourth combining cylindrical waveguide 201 and a fifth combining cylindrical waveguide 202 which are coaxially arranged.

[0038] Each combined rectangular branch structure 400 is radially symmetrically arranged around the axis of the first combined cylindrical waveguide 101 , the second combined cylindrical waveguide 102 or the third combined cylindrical waveguide 103 , and consists of a first combined rectangular waveguide branch 401 and a second combined rectangular waveguide branch 402 .

[0039] like Figure 1 As shown, in each combined rectangular branch structure 400 , the first combined rectangular waveguide branch 401 is located closer to the first combined cylindrical waveguide 101 , the second combined cylindrical waveguide 102 and the third combined cylindrical waveguide 103 than the second combined rectangular waveguide branch 402 .

[0040] Part of the space between two adjacent combined rectangular branch structures 400 is covered by the third combined cylindrical waveguide 103. Figure 1 The dashed box shows ( Figure 1 The coverage between the adjacent combined rectangular branch structures 400 and the third combined cylindrical waveguide 303 is not shown). The adjacent combined rectangular branch structures 400 are partially covered by the third combined cylindrical waveguide 103, so that the isolated ports between the combined rectangular branch structures 400 are realized, so that the port isolation between the combined rectangular branch structures 400 is higher and independent of each other.

[0041] In a specific embodiment, Figure 1As shown, there are 8 combined rectangular branch structures 400, and they are all arranged radially symmetrically with the axis of the combined cylindrical waveguide as the axis. The first combined cylindrical waveguide 101, the second combined cylindrical waveguide 102, the third combined cylindrical waveguide 103, the fourth combined cylindrical waveguide 201 and the fifth combined cylindrical waveguide 202 together form a radial combined cylinder.

[0042] like Figure 1 As shown, the coaxial ridge waveguide unit 300 is coaxially arranged with the first combining cylindrical waveguide 101, the second combining cylindrical waveguide 102 and the third combining cylindrical waveguide 103, and is used to convert the coaxial signal synthesized by the radial combining unit 100 into a standard rectangular waveguide and output it.

[0043] like Figures 1 to 3 As shown, the coaxial ridge-turned waveguide unit 300 is composed of a standard rectangular waveguide 301, a three-level metal step 302, and a coaxial metal cylinder 303. In a specific implementation, the standard rectangular waveguide 301 is a standard WR159 waveguide.

[0044] like Figure 4 As shown, the coaxial metal cylinder 303 is composed of a first cylinder 3031, a second cylinder 3032 and an air cavity 3033, wherein the width of the second cylinder 3032 is the same as that of the air cavity 3033, and the first cylinder 3031 is spaced between the air cavity 3033 and the second cylinder 3032. Figure 4 The oblique line shading indicates that, in a specific implementation, the resistance of the first cylinder 3031 is 50 ohms.

[0045] like Figure 1 As shown, each combined rectangular branch structure 400 is connected to a combined step waveguide unit 500 and a microstrip to waveguide conversion circuit 600 at one end away from the first combined cylindrical waveguide 101 , the second combined cylindrical waveguide 102 or the third combined cylindrical waveguide 103 .

[0046] like Figure 1 As shown, the combined step waveguide unit 500 is used to convert the vertically transmitted signal transmission to the horizontal direction and transmit it to the combined rectangular branch structure, such as Figure 1 As shown, specifically, the combining step waveguide unit 500 is composed of three-level step waveguides, namely a first-level step waveguide 501 , a second-level step waveguide 502 and a third-level step waveguide 503 .

[0047] The microstrip-to-waveguide conversion circuit 600 is used to receive radio frequency signals and transmit the signals to the combined step waveguide unit 500 by means of microstrip-to-waveguide conversion. Figure 1As shown, specifically, the microstrip to waveguide conversion circuit 600 is composed of a 1 / 4 wavelength reflection cavity 601, a microstrip probe unit 602, and a standard waveguide 603. In a specific implementation, the standard waveguide 603 is a standard WR159 waveguide.

[0048] In the radial power combiner based on the E-plane provided in this embodiment, the signal flow direction is as follows:

[0049] The input signal is generally a power-amplified RF signal, which first enters through the microstrip probe unit 602, then enters the 1 / 4 wavelength reflection cavity 601 through the microstrip probe unit 602, and finally enters the standard waveguide 603 to be synthesized and vertically output to the combined step waveguide unit 500.

[0050] The microstrip-to-waveguide conversion circuit 600 inserts the microstrip probe unit 602 into the standard waveguide 603, and synthesizes the electromagnetic field in the waveguide and propagates it through the microstrip-to-waveguide method. The insertion loss of the electromagnetic field propagating in the waveguide is very small. Through the microstrip-to-waveguide method, it can not only realize the conversion of electromagnetic propagation from plane to space, but also inherit the advantage of good heat dissipation of planar electromagnetic propagation, and it is also conducive to integration with the external driving stage circuit, thereby achieving high integration within a small volume.

[0051] In the combined step waveguide unit 00, the signal is vertically transmitted to the third-level step waveguide 503, and sequentially transmitted through the third-level step waveguide 503, the second-level step waveguide 502 and the first-level step waveguide 501, and after reaching the first-level step waveguide 501, it is turned to the horizontal direction and transmitted to the combined rectangular branch structure 400. The adjustment of the three-level step waveguide can effectively realize the transmission of the rectangular waveguide with a broadband working bandwidth in the TE10 mode.

[0052] In the combined rectangular branch structure 400 , signals are sequentially input into the second combined rectangular waveguide branch 402 and the first combined rectangular waveguide branch 401 . The signals transmitted through the rectangular branch structure 400 are combined into one signal in the combined cylindrical waveguide and input into the third combined cylindrical waveguide 103 .

[0053] The signal is transmitted to the coaxial ridge-turned waveguide unit 300 after sequentially passing through the third combined cylindrical waveguide 103 , the second combined cylindrical waveguide 102 and the first combined cylindrical waveguide 101 .

[0054] In the specific implementation process, when selecting the height of the third combined cylindrical waveguide 103, its height is determined to meet the half length of the minimum working wavelength of the power combiner, so that the main mode is the TM00 mode when the electromagnetic field passes through the cylindrical waveguide, and the height of the third combined cylindrical waveguide 103 can determine the working mode of the power combiner. Selecting its height to be less than the normal working wavelength can effectively suppress high-order modes. The radius length and height of the first combined cylindrical waveguide 101, the second combined cylindrical waveguide 102, the third combined cylindrical waveguide 103, the fourth combined cylindrical waveguide 201 and the fifth combined cylindrical waveguide 202 can improve the matching of the entire radial combined cylinder, and eliminate the influence of the high-order modes in the rectangular waveguide and the coaxial metal cylinder 303.

[0055] Since adjacent combined rectangular branch structures 400 are partially covered by the third combined cylindrical waveguide 103, isolated ports between the combined rectangular branch structures 400 are realized, so that the port isolation between the combined rectangular branch structures 400 is higher and independent of each other, so that the entire power combiner does not need to add an additional isolator, such as Figure 5 The figure shows the isolation degree of each combined rectangular branch structure 400 of the power combiner provided by the present embodiment. At the same time, when a power amplifier unit used to cooperate with the power combiner is damaged, the remaining power amplifier units used to cooperate with the power combiner can still work normally, and the output power of the power combiner only decreases at a certain ratio, thereby improving the stability and reliability of the power combiner. In addition, since no additional isolator is required, the combiner has higher efficiency and lower manufacturing cost.

[0056] Adjusting the radius of the third combined cylindrical waveguide 103, the width and length of the first combined rectangular waveguide branch 401, and the width of the second combined rectangular waveguide branch 402 can effectively determine the operating frequency of the power combiner. The first combined rectangular waveguide branch 401 determines the transmission wavelength in the rectangular waveguide. Properly adjusting its width and length can reduce the influence of the mode change of the wide waveguide connecting the narrow waveguide, and can also increase the wavelength of the lower frequency band. In this embodiment, the second combined rectangular waveguide branch 402 is a standard working wavelength waveguide.

[0057] In the coaxial-to-ridge waveguide unit 300 , the combined coaxial signal outputted from the first combined cylindrical waveguide 101 sequentially passes through the coaxial metal cylinder 303 , the three-level metal step 302 , and the standard waveguide 301 , and then is converted into a standard rectangular waveguide and outputted.

[0058] When the signal passes through the coaxial metal cylinder 303, it is transmitted along the surface of the first cylinder 3031 to the second cylinder 3032. The first cylinder 3031 is a waveguide-to-coaxial, and the electromagnetic field excites an ideal TEM wave. When the signal is output through the standard waveguide 301, the conversion between the TEM mode and the TM10 mode is completed. In the coaxial-to-ridge waveguide unit 300, the ridge waveguide conversion is mainly mode conversion and impedance matching, and the main mode of the ridge waveguide is the TE10 mode.

[0059] The first cylinder 3031 in the coaxial metal cylinder 303 determines the minimum power capacity of the power combiner, such as Figure 4 As shown, appropriately increasing the radius of the first cylinder 3031 in the oblique line shaded portion can increase the power capacity, and selecting a low-loss dielectric material (such as gold-plated surface) can effectively reduce the loss of the skin effect during transmission. The coaxial ridge waveguide unit 300 of this structure has low loss, wide bandwidth and compact structure, and can be easily processed in an integrated manner.

[0060] When the TEM wave passes through the connection of the standard waveguide 301, a large change in the electromagnetic field will occur. However, since the radial combining unit 100 has several completely symmetrical combining rectangular branch structures 400 and multiple symmetrical cylindrical waveguides, its electromagnetic field has a high degree of symmetry in the transmission direction, so that when power is combined, the phases and amplitudes of each combining rectangular branch structure 400 are the same and equal, and are not affected by the change in the electromagnetic field, helping the entire combiner to achieve lower losses.

[0061] The E-plane-based radial power combiner provided in this embodiment divides the input signal into multiple signals with consistent amplitude and phase through the symmetrically structured combining rectangular branch structures 400, and realizes high-efficiency, low-loss and high-power capacity power distribution through combining cylindrical waveguides, while effectively suppressing high-order modes. Adjacent combining rectangular branch structures 400 are partially covered by the third combining cylindrical waveguide 103, thereby realizing isolated ports between the combining rectangular branch structures 400, making the port isolation between the combining rectangular branch structures 400 higher, effectively suppressing the signal reflection of the combining rectangular branch structures 400, solving the return loss of the combining rectangular branch structures 400 and the signal crosstalk between the combining rectangular branch structures 400, and making the multi-channel high-efficiency power synthesis more stable and reliable, such as Figure 6 The figure shows the return loss diagram of the common end of the power combiner provided in this embodiment. The combiner reduces the setting of the external isolator, which can effectively shorten the size of the whole machine and improve the efficiency of the power amplifier, and has a great competitive advantage in economic cost. Since the power combiner adopts the E-plane combining unit, it has great advantages in integration and miniaturization, and can be directly integrated with the subsequent circuit on the same plane.

[0062] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the technical solution of the present invention, and are not intended to limit the specific implementation methods of the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the claims of the present invention shall be included in the protection scope of the claims of the present invention.

Claims

1. A radial power combiner based on an E-plane, characterized in that: It includes radial combining unit, combining step waveguide unit, microstrip to waveguide conversion circuit, and coaxial to ridge waveguide unit; The radial combining unit comprises at least a first combining cylindrical waveguide, a second combining cylindrical waveguide and a third combining cylindrical waveguide which are coaxially arranged, and a plurality of combining rectangular branch structures; Each combined rectangular branch structure is arranged radially symmetrically with the axis of the combined cylindrical waveguide as the axis, and is composed of a first combined rectangular waveguide branch and a second combined rectangular waveguide branch; In each combined rectangular branch structure, the first combined rectangular waveguide branch is located closer to the combined cylindrical waveguide than the second combined rectangular waveguide branch; Parts between two adjacent combined rectangular branch structures are covered by the third combined cylindrical waveguide; Each combined rectangular branch structure is connected to a combined step waveguide unit and a microstrip to waveguide conversion circuit at one end away from the combined cylindrical waveguide; The microstrip-to-waveguide conversion circuit is used to receive radio frequency signals and transmit the signals to the combined step waveguide unit by means of microstrip-to-waveguide conversion; The combined step waveguide unit is used to transmit the vertically transmitted signal horizontally to the combined rectangular branch structure; The signals transmitted by each combined rectangular branch structure are combined into one signal at the combined cylindrical waveguide, and are sequentially transmitted through the third combined cylindrical waveguide, the second combined cylindrical waveguide and the first combined cylindrical waveguide to the coaxial ridge waveguide unit; The coaxial ridge waveguide unit is coaxially arranged with the combining cylindrical waveguide, and is used to convert the coaxial signal synthesized by the radial combining unit into a standard rectangular waveguide and output it; The coaxial ridge-turned waveguide unit comprises a coaxial metal cylinder, three-level metal steps and a standard waveguide; The coaxial metal cylinder comprises a first cylinder, a second cylinder and an air cavity; the width of the second cylinder is the same as that of the air cavity, and a section of the first cylinder is spaced between the air cavity and the second cylinder.

2. The E-plane based radial power combiner according to claim 1, characterized in that: The microstrip-to-waveguide conversion circuit comprises a 1 / 4 wavelength reflection cavity, a microstrip probe unit and a standard waveguide.

3. The E-plane based radial power combiner according to claim 1, characterized in that: The combined step waveguide unit is composed of three-level step waveguides.

4. The E-plane based radial power combiner according to any one of claims 1 to 3, characterized in that: The radial combining unit further comprises a fourth combining cylindrical waveguide and a fifth combining cylindrical waveguide which are coaxially arranged.

5. The E-plane based radial power combiner according to claim 1, characterized in that: The resistance of the first cylinder is 50 ohms.

6. The E-plane based radial power combiner according to any one of claims 1 or 5, characterized in that: The standard waveguide is the WR159 waveguide.

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