CN116014402A - Radial power synthesizer based on E face - Google Patents
Radial power synthesizer based on E face Download PDFInfo
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Abstract
The invention provides a radial power synthesizer based on an E surface, which comprises a radial combining unit, a combining step waveguide unit, a microstrip-to-waveguide conversion circuit and a coaxial-to-ridge waveguide unit, wherein the combining step waveguide unit is connected with the radial combining unit; the combined rectangular branch structure is arranged radially and symmetrically by taking the axis of the combined cylindrical waveguide as the axis; a part of the third combined cylindrical waveguide covers the space between two adjacent combined rectangular branch structures; the microstrip-to-waveguide conversion circuit is used for receiving radio frequency signals and transmitting the signals to the combining step waveguide unit in a microstrip-to-waveguide mode; the combining step waveguide unit is used for transmitting the vertically transmitted signal to the combining rectangular branch structure from the horizontal direction. The radial power synthesizer overall structure provided by the invention has higher symmetry, so that the electromagnetic field has high symmetry in the transmission direction, the loss of the synthesizer is lower, and the isolation between the branch structures is good, and an isolator is not required to be additionally arranged, so that the manufacturing cost can be reduced.
Description
Technical Field
The invention relates to the field of communication, in particular to a radial power synthesizer based on an E surface.
Background
Along with the high-speed development of the electronic information industry, the development of the communication industry is gradually changed, the requirements on a transmitting system are higher and higher in the satellite communication field, and the power synthesis technology is required to meet the requirements of the system;
the satellite communication is widely applied to the wide fields of national defense construction, personal mobile communication, aerospace communication and the like, is limited by process and heat dissipation conditions, a single power amplifying tube which is commonly used can not meet the power requirement of a modern power amplifier far, the power synthesis becomes the necessary condition of a high-power amplifier, the transmission distance of the high-power amplifier is farther, the large bandwidth carries larger information capacity, the high power and the requirement of a large bandwidth are development trends, and the common power synthesis modes are planar binary synthesis, space power synthesis and radial waveguide synthesis;
the planar binary synthesis generally adopts a microstrip line to transmit radio frequency signals, the ultra-wideband design is realized by multiple impedance transformations, the microstrip line requires longer line length, the conductor loss and the dielectric loss are increased, and the traditional planar synthesis loss is overlarge along with the increase of synthesis times; thereby limiting the use of high power synthesis modes.
Space power synthesis is based on a low-loss broadband waveguide different-surface fin line antenna array design technology. The broadband matching circuit usually adopts a multi-section matching mode to widen the bandwidth, long transmission lines are needed when the frequency band is very wide, the isolation degree difference between channels exists in the space power synthesis of the waveguide different-surface fin line antenna array, the heat dissipation mode and the working bandwidth are limited, and the use of a broadband high-power synthesis mode is limited.
The radial waveguide power synthesis-based power synthesis method is characterized in that power synthesis is carried out on multipath microwave signals in a space in a waveguide cavity, the characteristic of small waveguide loss is fully utilized, meanwhile, the advantage of flexible waveguide impedance transformation is exerted, and the power synthesis with multiple paths and high efficiency is realized, but the technology of the conventional radial waveguide synthesizer has the following defects:
1. the defects of poor isolation between channels and poor standing wave of split ports are solved, and in order to solve the problems, an isolator is required to be used when a power amplification unit is connected so as to avoid mutual crosstalk self-excitation, so that the efficiency of power amplification synthesis is lower, and the high-power amplification synthesis is not facilitated;
2. most high-power amplifier units have to use an E-plane synthesis mode due to the limitation of a heat dissipation mode, and H-plane-to-E-plane conversion is needed when a radial waveguide synthesizer based on an H plane is connected with the power amplifier units, so that superposition of an E plane and an H plane exists in the height direction. When the power amplifier works in the frequency band below ka, the radial waveguide synthesizer based on the H surface is unfavorable for the miniaturization and integration trend required by the market due to the large waveguide size, so that the application in the communication field is limited to a certain extent.
Disclosure of Invention
The invention aims to overcome at least one defect of the prior art, and provides a radial power combiner based on an E surface, which is used for solving the problems that the existing radial waveguide combiner is poor in isolation effect and the application range of the radial waveguide combiner based on an H surface is limited.
The technical scheme adopted by the invention comprises the following steps:
in a first aspect, the invention provides a radial power combiner based on an E surface, which comprises 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 at least comprises a first combining cylindrical waveguide, a second combining cylindrical waveguide, a third combining cylindrical waveguide and a plurality of combining rectangular branch structures which are coaxially arranged; each path of combined rectangular waveguide branch structure is arranged in radial symmetry by taking the axis of the combined cylindrical waveguide as the axis, and consists of a first combined rectangular waveguide branch and a second combined rectangular waveguide branch; in each combined rectangular branch structure, the position of the first combined rectangular waveguide branch is closer to the combined cylindrical waveguide than the position of the second combined rectangular waveguide branch; a part of the third combined cylindrical waveguide covers the space between two adjacent combined rectangular branch structures; each path of combined rectangular branch structure is connected with a combined step waveguide unit and a microstrip-to-waveguide conversion circuit at one end far away from the combined cylindrical waveguide; the microstrip-to-waveguide conversion circuit is used for receiving radio frequency signals and transmitting the signals to the combining step waveguide unit in a microstrip-to-waveguide mode; the combining step waveguide unit is used for converting the vertically transmitted signal transmission into the horizontal transmission to the combining rectangular branch structure; the signal transmitted by each path of combined rectangular branch structure is combined into one path of signal at the combined cylindrical waveguide, and the signal sequentially passes through the third combined cylindrical waveguide, the second combined cylindrical waveguide and the first combined cylindrical waveguide and then is transmitted to the coaxial ridge waveguide unit; the coaxial ridge-turning waveguide unit is coaxially arranged with the combined cylindrical waveguide and is used for converting coaxial signals synthesized by the radial combined unit into standard rectangular waveguides and outputting the standard rectangular waveguides.
The invention provides a radial power synthesizer, which aims to solve the limitation brought by H-plane-based synthesizers and is based on E-plane design, and comprises a radial combining unit consisting of a completely symmetrical combining rectangular branch structure and a plurality of symmetrical cylindrical waveguides, a coaxial ridge-turning waveguide unit connected with the radial combining unit, and a combining step waveguide unit and a microstrip-to-waveguide conversion circuit connected with each combining rectangular branch structure. Each path of combined rectangular branch structure receives signals, and propagates an electromagnetic field after being synthesized in a waveguide through a microstrip-waveguide conversion circuit, and can realize conversion of plane-to-space electromagnetic propagation, inherit the advantage of good heat dissipation of plane electromagnetic propagation, and is beneficial to integration with an external push-stage circuit, so that high integration in a small volume range is realized, and a combined step waveguide unit converts a vertically transmitted signal into horizontal transmission, and rectangular waveguide TE10 mode transmission of broadband working bandwidth is effectively realized. And parts of the adjacent combined rectangular branch structures are covered by the third combined cylindrical waveguide, so that isolation ports between the combined rectangular branch structures are realized, the port isolation between the combined rectangular branch structures is higher, and the ports are independent. And finally, synthesizing a signal by the signals of each path of combined rectangular branch structure, inputting the signals into a coaxial ridge-turning waveguide unit after passing through a combined cylindrical waveguide, and converting the mode of the coaxial waveguide from a TEM mode of the coaxial line to a TE10 mode of the waveguide by the coaxial ridge-turning waveguide unit in an E-plane excitation mode. The radial power synthesizer integral structure provided by the invention has higher symmetry, so that the electromagnetic field has high symmetry in the transmission direction, is not influenced by electromagnetic field change in the transmission process of TEM waves, has lower loss, simultaneously has equal phase and amplitude of each split port during power synthesis, has good isolation between the combined rectangular branch structures of the synthesizer, does not need to be additionally provided with an isolator, and can reduce the manufacturing cost.
Further, the coaxial ridge waveguide unit comprises a coaxial metal cylinder, three-stage metal steps and a standard waveguide which are connected in sequence.
The combined coaxial signal passing through the cylindrical waveguide is sequentially converted into a standard rectangular waveguide after passing through the coaxial metal cylinder, the three-stage metal step and the standard waveguide, and the conversion from the TEM mode to the TM10 mode is completed. The coaxial ridge waveguide unit with the structure has the advantages of small loss, wide frequency band and compact structure, and can be conveniently and integrally processed.
Further, the microstrip to waveguide conversion circuit comprises a 1/4 wavelength reflection cavity, a microstrip probe unit and a standard waveguide.
The input signal firstly enters through the microstrip probe unit, enters into the 1/4 wavelength reflecting cavity through the microstrip probe unit, and finally is input into the standard waveguide to be synthesized and output. The microstrip to waveguide conversion circuit stretches the microstrip probe unit into the standard waveguide, and the electromagnetic field is synthesized in the waveguide in a microstrip to waveguide mode and then propagates. The electromagnetic field has small propagation insertion loss in the waveguide, and can realize the conversion of plane to space electromagnetic propagation by a mode of converting the microstrip into the waveguide, inherit the advantage of good heat dissipation of plane electromagnetic propagation, and is beneficial to being integrated with an external push-stage circuit, thereby realizing high integration in a small volume range.
Further, the combining step waveguide unit is composed of three-stage step waveguides.
In the combined step waveguide unit, an input signal vertically enters the highest-level step waveguide, is input into the combined rectangular branch structure through the three-level step waveguide, is transferred into the horizontal direction for transmission in the combined rectangular branch structure, and can effectively realize the transmission of the rectangular waveguide with the broadband working bandwidth in TE10 modes by adjusting the three-level step waveguide.
Further, the radial combining unit further comprises a fourth combining cylindrical waveguide and a fifth combining cylindrical waveguide which are coaxially arranged.
The signal does not pass through the fourth combined cylindrical waveguide and the fifth combined cylindrical waveguide in the transmission process, but the radial length and the height of the fourth combined cylindrical waveguide and the fifth combined cylindrical waveguide can improve the matching of the whole radial combined unit and eliminate the influence of higher modes in the rectangular waveguide and the coaxial ridge-turning waveguide unit.
Further, 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 separated between the air cavity and the second cylinder.
The first cylinder is waveguide-coaxial and the signal is transmitted along the surface of the first cylinder to the second cylinder.
Further, the first cylinder is separated by a length of 50 ohms.
Further, the standard waveguide is a WR159 waveguide.
Compared with the prior art, the invention has the beneficial effects that:
the invention provides a radial power synthesizer based on an E surface, which can solve the limitation brought by the synthesizer based on an H surface by the design based on the E surface, has great advantage on the aspect of miniaturization and can be directly integrated with a post-stage circuit on the same plane. The power synthesizer comprises a radial unit composed of a completely symmetrical rectangular branch structure and a plurality of symmetrical cylindrical waveguides, a coaxial ridge waveguide unit connected with the radial unit, and a step waveguide unit and a microstrip ridge waveguide conversion circuit connected with each path of rectangular branch structure. The microstrip-to-waveguide conversion circuit can realize conversion of plane-to-space electromagnetic propagation in a microstrip-to-waveguide mode, inherits the advantage of good heat dissipation of plane electromagnetic propagation, and is beneficial to integration with an external push-stage circuit, so that high integration in a small-volume range is realized. The adjacent rectangular branch structures are partially covered by the third cylindrical waveguide, so that isolation ports between the rectangular branch structures are realized, the port isolation between the rectangular branch structures is higher, the rectangular branch structures are independent from each other, an additional isolator is not needed to be added, even if a power amplifier matched with the rectangular branch structures is damaged, other power amplifiers can still work, and the output power of the synthesizer is reduced according to a certain proportion. The overall structure of the radial power synthesizer provided by the invention has higher symmetry, so that the electromagnetic field has high symmetry in the transmission direction, is not influenced by electromagnetic field change in the transmission process of TEM waves, has lower loss, and simultaneously has the same phase and equal amplitude of each split port during power synthesis.
Drawings
Fig. 1 is a schematic perspective view of a radial power combiner based on an E-plane in embodiment 1 of the present invention.
Fig. 2 is a schematic diagram of the back structure of the E-plane based radial power combiner in embodiment 1 of the present invention.
Fig. 3 is a schematic diagram of another back structure of the E-plane based radial power combiner in embodiment 1 of the present invention.
Fig. 4 is a schematic structural diagram of a coaxial metal cylinder 303 in embodiment 1 of the present invention.
Fig. 5 is a schematic diagram showing the isolation of each of the rectangular branch structures 400 of the power combiner in embodiment 1 of the present invention.
Fig. 6 is a schematic diagram of return loss at the common end of the power combiner in embodiment 1 of the present invention.
Detailed Description
The drawings are for illustrative purposes only and are not to be construed as limiting the invention. For better illustration of the following embodiments, some parts of the drawings may be omitted, enlarged or reduced, and do not represent the actual product dimensions; it will be appreciated by those skilled in the art that certain well-known structures in the drawings and descriptions thereof may be omitted.
Example 1
The present embodiment provides a radial power combiner based on an E-plane, where the combiner includes a radial combining unit 100, a coaxial turning ridge waveguide unit 300, a combining step waveguide unit 500, and a microstrip turning waveguide conversion circuit 600.
As shown in fig. 1, the radial combining unit 100 includes at least a first combining cylindrical waveguide 101, a second combining cylindrical waveguide 102, and a third combining cylindrical waveguide 103, which are coaxially disposed, and a plurality of combining rectangular branching structures 400.
In a preferred embodiment, as shown in fig. 3, the radial combining unit 100 further comprises a fourth combining cylindrical waveguide 201 and a fifth combining cylindrical waveguide 202 coaxially arranged.
Each of the combined rectangular waveguide branches 400 is arranged radially symmetrically with respect to the axis of the first combined cylindrical waveguide 101, the second combined cylindrical waveguide 102 or the third combined cylindrical waveguide 103, and is composed of a first combined rectangular waveguide branch 401 and a second combined rectangular waveguide branch 402.
As shown in fig. 1, in each of the combined rectangular-waveguide branches 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.
The third combined cylindrical waveguide 103 is partially covered between two adjacent combined rectangular branching structures 400, as shown by the dashed line box in fig. 1 (no coverage is shown between the partially adjacent combined rectangular branching structures 400 and the third combined cylindrical waveguide 303 in fig. 1). The adjacent combined rectangular branch structures 400 are partially covered by the third combined cylindrical waveguide 103, so that isolation ports between the combined rectangular branch structures 400 are realized, the port isolation between the combined rectangular branch structures 400 is higher, and the ports are independent.
In a specific embodiment, as shown in fig. 1, the number of the combined rectangular branching structures 400 is 8, and the combined rectangular branching structures are all arranged radially symmetrically with respect to the axis of the combined cylindrical waveguide. The first combining cylindrical waveguide 101, the second combining cylindrical waveguide 102, the third combining cylindrical waveguide 103, the fourth combining cylindrical waveguide 201, and the fifth combining cylindrical waveguide 202 together constitute a radial combining cylinder.
As shown in fig. 1, the coaxial ridge waveguide unit 300 is coaxially disposed with the first, second and third combining cylindrical waveguides 101, 102 and 103, and is used for converting the coaxial signal synthesized by the radial combining unit 100 into a standard rectangular waveguide and outputting.
As shown in fig. 1 to 3, the coaxial ridge waveguide unit 300 is composed of a standard rectangular waveguide 301, a three-stage metal step 302, and a coaxial metal cylinder 303. In a specific embodiment, the standard rectangular waveguide 301 is a standard WR159 waveguide.
As shown in fig. 4, the coaxial metal cylinder 303 is composed of a first cylinder 3031, a second cylinder 3032 and an air chamber 3033, wherein the width of the second cylinder 3032 is the same as that of the air chamber 3033, and a section of the first cylinder 3031 is separated between the air chamber 3033 and the second cylinder 3032, and is shown by diagonal hatching in fig. 4, and in a specific embodiment, the separated section of the first cylinder 3031 is 50 ohms.
As shown in fig. 1, each of the combined rectangular branching structures 400 is connected to a combined stepped waveguide unit 500 and a microstrip-to-waveguide conversion circuit 600 at an end far from the first combined cylindrical waveguide 101, the second combined cylindrical waveguide 102 or the third combined cylindrical waveguide 103.
As shown in fig. 1, the combining step waveguide unit 500 is used for transmitting a vertically transmitted signal to a combining rectangular branching structure in a horizontal direction, and as shown in fig. 1, specifically, the combining step waveguide unit 500 is composed of three step waveguides, namely, a first step waveguide 501, a second step waveguide 502 and a third step waveguide 503.
The microstrip to waveguide conversion circuit 600 is configured to receive a radio frequency signal and transmit the signal to the combining step waveguide unit 500 by way of microstrip to waveguide. As shown in fig. 1, specifically, the microstrip-to-waveguide conversion circuit 600 is composed of a 1/4 wavelength reflective cavity 601, a microstrip probe unit 602, and a standard waveguide 603. In a specific embodiment, the standard waveguide 603 is a standard WR159 waveguide.
In the radial power combiner based on the E plane provided in this embodiment, the signal flow direction is as follows:
the input signal is typically a radio frequency signal after power amplification, the radio frequency signal enters through the microstrip probe unit 602 first, enters the 1/4 wavelength reflecting cavity 601 through the microstrip probe unit 602, and finally is input into the standard waveguide 603 to be synthesized and output to the combining step waveguide unit 500 vertically.
The microstrip to waveguide conversion circuit 600 extends the microstrip probe unit 602 into the standard waveguide 603, and synthesizes an electromagnetic field in the waveguide by way of microstrip to waveguide, and propagates the electromagnetic field. The electromagnetic field has small propagation insertion loss in the waveguide, and can realize the conversion of plane to space electromagnetic propagation by a mode of converting the microstrip into the waveguide, inherit the advantage of good heat dissipation of plane electromagnetic propagation, and is beneficial to being integrated with an external push-stage circuit, thereby realizing high integration in a small volume range.
In the combined step waveguide unit 00, a signal is vertically transmitted to the third step waveguide 503, sequentially transmitted through the third step waveguide 503, the second step waveguide 502 and the first step waveguide 501, and after reaching the first step waveguide 501, is transferred to the combined rectangular branch structure 400 in a horizontal direction. The three-stage step waveguide can effectively realize the transmission of the rectangular waveguide with the broadband working bandwidth in TE10 mode.
In the combined rectangular branching structure 400, signals are sequentially input to the second combined rectangular waveguide branch 402 and the first combined rectangular waveguide branch 401, and signals transmitted through the rectangular branching structure 400 are combined into one signal in the combined cylindrical waveguide and input to the third combined cylindrical waveguide 103.
The signal sequentially passes through the third combining cylindrical waveguide 103, the second combining cylindrical waveguide 102 and the first combining cylindrical waveguide 101 and then is transmitted to the coaxial ridge waveguide unit 300.
In the specific implementation process, when the height of the third combined cylindrical waveguide 103 is selected, the height is determined to be half of the length of the minimum working wavelength of the power combiner, so that the main mode is TM00 mode when the electromagnetic field passes through the cylindrical waveguide, the height of the third combined cylindrical waveguide 103 can determine the working mode of the power combiner, and the height is selected to be smaller than the normal working wavelength, so that the higher-order mode can be effectively restrained. The radius length and height of the first combining cylindrical waveguide 101, the second combining cylindrical waveguide 102, the third combining cylindrical waveguide 103, the fourth combining cylindrical waveguide 201 and the fifth combining cylindrical waveguide 202 can improve the matching of the whole radial combining cylindrical and eliminate the influence caused by the higher order modes in the rectangular waveguide and the coaxial metal cylindrical 303.
Because the adjacent combined rectangular branch structures 400 are partially covered by the third combined cylindrical waveguide 103, isolation 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 the ports are independent of each other, so that the whole power combiner does not need to additionally increase an isolator, and the isolation schematic diagram of each combined rectangular branch structure 400 of the power combiner provided by the embodiment is shown in fig. 5. Meanwhile, when a certain power amplifier unit matched with the power combiner is damaged, the rest power amplifier units matched with the power combiner can still work normally, the output power of the power combiner is only reduced according to a certain proportion, the stability and the reliability of the power combiner are improved, and the efficiency of the combiner is higher and the manufacturing cost is lower because an isolator is not required to be additionally arranged.
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 may effectively determine the operating frequency of the power combiner. The first combined rectangular waveguide branch 401 determines the transmission wavelength in the rectangular waveguide, and properly adjusting its width and length can reduce the effect of mode variation of the wide waveguide connecting the narrow waveguide, while also increasing the wavelength of the lower frequency band of transmission. In this embodiment, the second combined rectangular waveguide branch 402 is a standard operating wavelength waveguide.
In the coaxial ridge waveguide unit 300, the combined coaxial signal output by the first combined cylindrical waveguide 101 is sequentially passed through the coaxial metal cylinder 303, the three-stage metal step 302, and the standard waveguide 301, and then converted into a standard rectangular waveguide, and output.
The signal is transmitted along the surface of the first cylinder 3031 to the second cylinder 3032 as it passes through the coaxial metal cylinder 303, the first cylinder 3031 is coaxial to waveguide, the electromagnetic field excites an ideal TEM wave, and when the signal is output through the standard waveguide 301, the conversion between the TEM mode to the TM10 mode is completed. In the coaxial ridge waveguide unit 300, the ridge waveguide conversion is mainly mode conversion and impedance matching, and the main mode of the ridge waveguide is TE10 mode.
The first cylinder 3031 in the coaxial metal cylinder 303 determines the minimum power capacity of the power combiner, as shown in fig. 4, by properly increasing the radius of the first cylinder 3031 in the hatched portion, the power capacity can be increased, and the loss of the skin effect during transmission can be effectively reduced by using a low-loss dielectric material (such as surface gold plating). The coaxial ridge waveguide unit 300 with the structure has the advantages of small loss, wide frequency band and compact structure, and can be conveniently and integrally processed.
The TEM wave will generate a larger electromagnetic field change when passing through the connection of the standard waveguide 301, but because of the plurality of completely symmetrical rectangular branch structures 400 and the plurality of symmetrical cylindrical waveguides in the radial combining unit 100, the electromagnetic field of the TEM wave has high symmetry in the transmission direction, so that the phases of the rectangular branch structures 400 are identical in amplitude and are not affected by the electromagnetic field change during power synthesis, and the whole synthesizer is helped to achieve lower loss.
The radial power combiner based on the E-plane provided in this embodiment divides an input signal into signals with consistent multipath amplitude and phase through the symmetrical structure of the combined rectangular branch structure 400, and achieves power distribution with high efficiency, low loss and high power capacity through the combined cylindrical waveguide, and simultaneously effectively suppresses higher order modes. The adjacent rectangular branch structures 400 are covered by the third cylindrical waveguide 103, so that isolation ports between the rectangular branch structures 400 are realized, the port isolation between the rectangular branch structures 400 is higher, signal reflection of the rectangular branch structures 400 is effectively inhibited, return loss of the rectangular branch structures 400 and signal crosstalk between the rectangular branch structures 400 are solved, and the multi-channel high-efficiency power synthesis is more stable and reliable, as shown in fig. 6, which is a return loss schematic diagram of the power synthesizer public end provided by the embodiment. The synthesizer reduces the arrangement of the external isolator, can effectively shorten the size of the whole machine and improve the efficiency of the power amplifier, and has great competitive advantage in the aspect of economic cost. Because the power synthesizer adopts the E-plane synthesizing unit, the power synthesizer has great advantage in the aspect of integration miniaturization, and can be directly integrated with a post-stage circuit on the same plane.
It should be understood that the foregoing examples of the present invention are merely illustrative of the present invention and are not intended to limit the present invention to the specific embodiments thereof. Any modification, equivalent replacement, improvement, etc. that comes within the spirit and principle of the claims of the present invention should be included in the protection scope of the claims of the present invention.
Claims (8)
1. The radial power synthesizer based on the E surface is characterized by comprising a radial combining unit, a combining step waveguide unit, a microstrip-to-waveguide conversion circuit and a coaxial-to-ridge waveguide unit;
the radial combining unit at least comprises a first combining cylindrical waveguide, a second combining cylindrical waveguide, a third combining cylindrical waveguide and a plurality of combining rectangular branch structures which are coaxially arranged;
each path of combined rectangular waveguide branch structure is arranged in radial symmetry by taking the axis of the combined cylindrical waveguide as the axis, and consists of a first combined rectangular waveguide branch and a second combined rectangular waveguide branch;
in each combined rectangular branch structure, the position of the first combined rectangular waveguide branch is closer to the combined cylindrical waveguide than the position of the second combined rectangular waveguide branch;
a part of the third combined cylindrical waveguide covers the space between two adjacent combined rectangular branch structures;
each path of combined rectangular branch structure is connected with a combined step waveguide unit and a microstrip-to-waveguide conversion circuit at one end far away from the combined cylindrical waveguide;
the microstrip-to-waveguide conversion circuit is used for receiving radio frequency signals and transmitting the signals to the combining step waveguide unit in a microstrip-to-waveguide mode;
the combining step waveguide unit is used for converting the vertically transmitted signal transmission into the horizontal transmission to the combining rectangular branch structure;
the signal transmitted by each path of combined rectangular branch structure is combined into one path of signal at the combined cylindrical waveguide, and the signal sequentially passes through the third combined cylindrical waveguide, the second combined cylindrical waveguide and the first combined cylindrical waveguide and then is transmitted to the coaxial ridge waveguide unit;
the coaxial ridge-turning waveguide unit is coaxially arranged with the combined cylindrical waveguide and is used for converting coaxial signals synthesized by the radial combined unit into standard rectangular waveguides and outputting the standard rectangular waveguides.
2. The E-plane based radial power combiner of claim 1, wherein the coaxial turn-ridge waveguide unit comprises a coaxial metal cylinder, a three-level metal step, and a standard waveguide.
3. The E-plane based radial power combiner of claim 1, wherein the microstrip to waveguide conversion circuit comprises a 1/4 wavelength reflective cavity, a microstrip probe unit, and a standard waveguide.
4. The E-plane based radial power combiner of claim 1, wherein the combining step waveguide unit is comprised of a three-stage step waveguide.
5. The E-plane based radial power combiner of any of claims 1-4, wherein the radial combining unit further comprises a fourth combining cylindrical waveguide and a fifth combining cylindrical waveguide coaxially disposed.
6. The E-plane based radial power combiner of claim 2, wherein the coaxial metal cylinders comprise 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 separated between the air cavity and the second cylinder.
7. The E-plane based radial power combiner of claim 6, wherein the spaced apart first cylinders are 50 ohms.
8. The E-plane based radial power combiner of any of claims 2, 6 or 7, wherein the standard waveguide is a WR159 waveguide.
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| CN117254235A (en) * | 2023-10-10 | 2023-12-19 | 南通大学 | Broadband ridge waveguide power divider |
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| CN117254235A (en) * | 2023-10-10 | 2023-12-19 | 南通大学 | Broadband ridge waveguide power divider |
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