CN114824718B - Multi-path microwave power distribution device based on coaxial waveguide - Google Patents
Multi-path microwave power distribution device based on coaxial waveguide Download PDFInfo
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- CN114824718B CN114824718B CN202210427470.0A CN202210427470A CN114824718B CN 114824718 B CN114824718 B CN 114824718B CN 202210427470 A CN202210427470 A CN 202210427470A CN 114824718 B CN114824718 B CN 114824718B
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01P—WAVEGUIDES; RESONATORS, LINES, OR OTHER DEVICES OF THE WAVEGUIDE TYPE
- H01P5/00—Coupling devices of the waveguide type
- H01P5/12—Coupling devices having more than two ports
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Abstract
The invention discloses a multi-channel microwave power distribution device based on coaxial waveguide, comprising: an outer conductor housing including an annular outer housing side body and a bottom plate; an inner conductor and a stepped truncated cone conductor; the side body of the shell is provided with a plurality of openings in the area close to the bottom plate; the output end inner conductor rods are in one-to-one correspondence with the openings, one end of each output end inner conductor rod is fixedly connected with the first side wall, and the other end of each output end inner conductor rod extends into the opening; an output end space channel is formed between the output end inner conductor rod and the side wall of the opening, an input end space channel is formed between the inner conductor piece and the side wall of the shell side body, and a transition space channel is formed between the stepped round platform conductor piece and the side wall of the shell side body. Has lower loss and higher power capacity; the microwave multi-path number one-stage distribution is realized, a cascade connection mode is not needed to obtain multi-path number microwave output, and microwave loss caused by cascade connection is avoided; has the advantages of simple structure and integration.
Description
Technical Field
The invention relates to the technical field of microwave solid-state power distribution, in particular to a multi-channel microwave power distribution device based on coaxial waveguides.
Background
In the solid-state high-power microwave technology, the output power of a single solid-state device is limited by the influence of the physical characteristics of the semiconductor, the problems of processing technology, heat dissipation, impedance matching and the like, and the requirement of high-power application is far less than met. To solve this problem, a method of power distribution, amplification and recombination by a plurality of solid state devices is generally adopted to obtain a high power output.
The power divider is a microwave passive device for dividing one microwave signal into multiple microwave signals; conversely, multiple microwave signals can be combined into one path, and the microwave signals can be used as a combiner at the moment. Such devices are very important in the field of solid state microwave power distribution technology.
The prior art of power distribution technology is widely applied mainly according to physical layer structure classification: planar, waveguide type. The plane type has microstrip, slot line and strip line, and the common ones are: wilkinson power divider, microstrip branch line directional coupler, etc. The power divider mainly utilizes a circuit structure to realize power division, and has the defects of low power division efficiency, small power capacity and the like, which are not suitable for the high-power microwave distribution technology although the structure is compact.
The waveguide type combiner consists of metal waveguides, such as: rectangular waveguides, circular waveguides, coaxial waveguides, SIW (substrate integrated waveguide), etc., have very high power capacity and very low loss. A common waveguide type power splitter is a T-type power splitter. The T-type power divider can realize 2-way power division, and in order to obtain multiple paths of digital inputs or outputs, a cascade mode is generally adopted to obtain high-power output. The mode makes the distributor have larger volume, large microwave loss, low energy utilization rate and large electric loss when the power is larger.
Disclosure of Invention
In view of the above, the invention provides a multi-path microwave power distribution device based on coaxial waveguides, so as to solve the problem that in the existing high-power multi-path microwave power distribution technology, multi-path hundred-watt continuous wave power distribution is completed only through primary distribution.
The invention provides a multi-channel microwave power distribution device based on coaxial waveguides, which comprises: an outer conductor shell; the outer conductor shell comprises an annular outer shell side body and a bottom plate, and the bottom plate is connected with one side port of the outer shell side body; the inner conductor piece and the stepped round platform conductor piece are surrounded by the shell side body, the stepped round platform conductor piece is positioned between the inner conductor piece and the bottom plate, and the stepped round platform conductor piece is provided with a first top surface, a first bottom surface and a first side wall, wherein the first top surface and the first bottom surface are oppositely arranged, and the first side wall is connected with the first top surface and the first bottom surface; the inner conductor piece is fixedly connected with part of the first top surface; the area of the shell side body, which is close to the bottom plate, is provided with a plurality of openings penetrating through the shell side body from the inner side wall of the shell side body to the outer side wall of the shell side body, and the openings are uniformly distributed around the central shaft of the shell side body; the output end inner conductor rods are in one-to-one correspondence with the openings, one end of each output end inner conductor rod is fixedly connected with the first side wall, and the other end of each output end inner conductor rod extends into the opening; an output end space channel is formed between the output end inner conductor rod and the side wall of the opening; an input end space channel is formed between the inner conductor piece and the inner side wall of the shell side body; a transition space channel is formed between the stepped round platform conductor and the inner side wall of the shell side body; the transition space channel is communicated with the output end space channel and the input end space channel.
Optionally, the shape of the opening is a truncated cone; and the diameter of the pattern of the opening intersecting the outer side wall of the housing side body is smaller than the diameter of the pattern of the opening intersecting the inner side wall of the housing side body.
Optionally, the diameter of the pattern of the intersection of the opening and the outer side wall of the side body of the shell is 10 mm-16 mm; the diameter of the pattern of the opening intersecting the inner wall of the case side body is 20mm to 30mm.
Optionally, one end of the inner conductor rod at the output end is embedded into the stepped round platform conductor piece.
Optionally, the output end inner conductor rod is in a rod-shaped structure, and the extending direction of the output end inner conductor rod is perpendicular to the central axis of the shell side body.
Optionally, the diameter of the inner conductor rod of the output end is equal to 3 mm-7 mm, and the radius R of the pattern of the intersection of the opening and the outer side wall of the shell side body 1 Radius R of the conductor bar in the output end 2 The ratio range k of (2) satisfies
Optionally, the stepped round platform conductor piece comprises a body area and a disc bottom area connected with the body area, and the disc bottom area is positioned between the body area and the bottom plate; a side surface of the body region facing the inner conductor member is a first top surface; the body region comprises a first sub-body region to an N-th sub-body region which are sequentially connected in the direction from the bottom plate to the inner conductor, and the diameters of the first sub-body region to the N-th sub-body region are sequentially reduced, so that the side wall of the body region is provided with a step; the inner conductor rod of each output end is fixedly connected with the side wall of the first sub-body area; n is an integer greater than or equal to 2; the disc bottom area comprises a second sub-disc area, a Mth sub-disc area and a first sub-body area, wherein the second sub-disc area is sequentially connected with the Mth sub-disc area in the direction from the inner conductor piece to the bottom plate, the second sub-disc area is connected with the first sub-body area, and the diameters of the first sub-body area and the Mth sub-disc area are sequentially reduced.
Optionally, the stepped truncated cone conductor is in a conical structure.
Optionally, in the direction of the central axis of the shell side body, the diameter corresponding to the inner side wall of the shell side body is uniform and unchanged.
Optionally, the diameter of the inner side wall of the shell side body is 80-100 mm.
Optionally, the diameter of the inner conductor decreases from a side of the inner conductor facing the stepped circular truncated cone conductor to a side of the inner conductor facing away from the stepped circular truncated cone conductor.
Optionally, the length L of the inner conductor 1 20 mm-180 mm.
Optionally, the radius R of the bottom surface of the inner conductor facing one side of the stepped truncated cone conductor 5 Is 10 mm-12 mm.
Optionally, the radius R of the top surface of one side of the inner conductor facing away from the stepped truncated cone conductor 4 Is 10mm to 12mm, and R 4 Less than or equal to R 5 。
Optionally, the number of the openings is 8-20.
Optionally, the central axis of the inner conductor, the central axis of the stepped truncated cone conductor, and the central axis of the outer shell side body coincide.
The technical scheme provided by the invention has the following effects:
the output end and the input end of the power divider are coaxial. The coaxial line has simple structure and cylindrical symmetry, and the number of ports and the input mode are more selected on the premise of primary distribution; the coaxial line field distribution is symmetrical along the radial direction, is favorable for realizing equal-amplitude in-phase distribution, and has the advantage of high system distribution efficiency. In addition, the bandwidth performance of the coaxial line waveguide is good, and the power capacity which can be born is high.
Compared with the traditional microstrip power divider, the waveguide-based power divider has the advantages of low loss, high power capacity, good heat dissipation performance and the like; meanwhile, the invention can realize the one-stage distribution of the microwave multipath numbers without adopting a cascading mode to obtain multipath number microwave output, thereby avoiding the defect of microwave loss caused by cascading and having the advantage of structural integration.
The invention can realize the one-time completion of the multi-port distribution of the hundred-watt level continuous wave microwave power, has the advantages of low loss, high power capacity and good transmission performance, and meets the consistency of the amplitude and the phase of the output port. Taking 16 paths of power distribution of an S wave band as an example, the 16 paths of microwave power distribution can be completed only through one-stage distribution by virtue of finite element electromagnetic simulation and optimization, and the bandwidth is more than 300MHz. The power divider can be extended to other bands using the effect of wavelength co-ordination.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings that are needed in the description of the embodiments or the prior art will be briefly described, and it is obvious that the drawings in the description below are some embodiments of the present invention, and other drawings can be obtained according to the drawings without inventive effort for a person skilled in the art.
Fig. 1 is a schematic perspective view of a coaxial waveguide-based multi-channel microwave power distribution device according to an embodiment of the present invention;
fig. 2 and 3 are cross-sectional views of a coaxial waveguide-based multi-path microwave power splitting device;
FIG. 4 is a cross-sectional view of a stepped frustoconical conductor;
FIG. 5 is a cross-sectional view of an outer conductor housing;
FIG. 6 is a Voltage Standing Wave Ratio (VSWR) simulation result of a coaxial waveguide-based multi-path microwave power distribution device in an embodiment;
fig. 7 is an S-parameter simulation diagram of a coaxial waveguide-based multi-path microwave power distribution device in an embodiment.
Detailed Description
The following description of the embodiments of the present invention will be made apparent and fully in view of the accompanying drawings, in which some, but not all embodiments of the invention are shown. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
In the description of the present invention, it should be noted that the directions or positional relationships indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. are based on the directions or positional relationships shown in the drawings, are merely for convenience of describing the present invention and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the present invention, it should be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be either fixedly connected, detachably connected, or integrally connected, for example; can be mechanically or electrically connected; the two components can be directly connected or indirectly connected through an intermediate medium, or can be communicated inside the two components, or can be connected wirelessly or in a wired way. The specific meaning of the above terms in the present invention will be understood in specific cases by those of ordinary skill in the art.
In addition, the technical features of the different embodiments of the present invention described below may be combined with each other as long as they do not collide with each other.
The embodiment of the invention provides a multi-channel microwave power distribution device based on coaxial waveguides, which is combined with reference to fig. 1, 2, 3, 4 and 5 and comprises the following components:
an outer conductor case 100, wherein the outer conductor case 100 includes an annular outer case side body 101 and a bottom plate 101a, and the bottom plate 101a is connected to a side port of the outer case side body 101;
an inner conductor 102 and a stepped boss conductor 107 surrounded by the outer case side body 101, the stepped boss conductor 107 being located between the inner conductor 102 and the bottom plate 101a, the stepped boss conductor 107 having oppositely disposed first top and bottom surfaces, and a first side wall connected to the first top and bottom surfaces; the inner conductor 102 is fixedly connected with a part of the first top surface;
the area of the shell side body 101 close to the bottom plate 101a is provided with a plurality of openings 108 penetrating through the shell side body from the inner side wall of the shell side body 101 to the outer side wall of the shell side body 101, and the plurality of openings 108 are uniformly distributed around the central axis of the shell side body 101;
a plurality of output end inner conductor rods 103 corresponding to the openings 101 one by one, one end of each output end inner conductor rod 103 is fixedly connected with the first side wall, and the other end of each output end inner conductor rod 103 extends into the opening 108;
an output end space channel 104 is formed between the output end inner conductor rod 103 and the side wall of the opening 108, an input end space channel 105 is formed between the inner conductor member 102 and the inner side wall of the shell side body 101, a transition space channel 106 is formed between the stepped round platform conductor member 107 and the inner side wall of the shell side body 101, and the transition space channel 106 is communicated with the output end space channel 104 and the input end space channel 105.
In the embodiment, a primary distribution mode is adopted, so that the microwave transmission circuit has low loss, high efficiency and multiple paths, and has very good transmission performance when being applied to a low-loss microwave transmission circuit.
In the embodiment, the multipath microwave power distribution device is based on the coaxial waveguide arrangement, the field distribution of the coaxial waveguide is symmetrical along the radial direction, the uniform amplitude and in-phase distribution is facilitated, and the system distribution efficiency is high. The coaxial waveguide has good bandwidth performance, the cut-off frequency of the main mode is 0, and the power capacity is high, so that the power divider based on the coaxial waveguide has better transmission performance.
The output end and the input end of the invention are coaxial. The coaxial line is a double-conductor transmission line and consists of an inner conductor and an outer conductor. The coaxial line has simple structure and cylindrical symmetry, and the number of ports and the input mode are more selected on the premise of primary distribution; the coaxial line field distribution is symmetrical along the radial direction, is favorable for realizing equal-amplitude in-phase distribution, and has the advantage of high system distribution efficiency. In addition, the bandwidth performance of the coaxial line waveguide is good, and the power capacity which can be born is high.
The invention is based on the waveguide type power divider, and has the advantages of low loss, high power capacity, good heat dissipation performance and the like; meanwhile, the invention can realize the one-stage distribution of the microwave multipath numbers without adopting a cascading mode to obtain multipath number microwave output, thereby avoiding the defect of microwave loss caused by cascading and having the advantage of structural integration.
The power divider utilizes the characteristics of high power capacity, low insertion loss and the like of a metal coaxial structure, can realize the one-time completion of multi-port distribution of hundred-watt continuous wave microwave power, and meets the consistency of the amplitude and the phase of an output port. Taking 16 paths of power distribution of an S wave band as an example, the 16 paths of microwave power distribution can be completed only through one-stage distribution by virtue of finite element electromagnetic simulation and optimization, and the bandwidth is more than 300MHz. The power divider can be extended to other bands using the effect of wavelength co-ordination. The invention conforms to the development trend of the power distribution technology and has important research value in the research of the multipath power distribution technology.
The stepped truncated cone conductor 107 is used as a transition unit, and mainly achieves the purposes of impedance matching and bandwidth increase.
When the coaxial waveguide-based multipath microwave power distribution device works, microwaves are input by the input end space channels 105 and output from the plurality of input end space channels 104 through the transition space channels 106.
The multi-path microwave power distribution device of the coaxial waveguide is rotationally symmetrical about the central axis of the multi-path microwave power distribution device, and conditions are created for realizing the same-amplitude and same-phase output of each path.
The coaxial waveguide-based multipath microwave power distribution device can meet the requirement of hundred-watt continuous wave low-loss microwave power distribution.
The material of the outer conductor housing 100 may be selected from alloy materials that meet electrical properties, such as aluminum alloys, such as 6061 aluminum alloy or 6063 aluminum alloy.
In this embodiment, the housing side body 101 is a cylindrical ring. The diameter of the inner side wall of the housing side body 101 is uniform along the central axis direction of the housing side body 101. The outer side wall of the housing side body 101 has a uniform diameter in the central axis direction of the housing side body 101.
In one embodiment, the diameter (2R) of the inner side wall of the outer shell side body 101 corresponds to 3 ) 80mm to 100mm, e.g. R 3 43.5mm. The diameter that the inside wall of shell side body 101 corresponds is great, makes the space of input space passageway bigger like this, and the benefit to the transmission is: the part can realize the impedance matching of the input end and the transition section and the matching of the input end and the output end in size, and has the characteristics of high power capacity and uniform field distribution.
The inner conductor 102 is an alloy material that optionally meets electrical characteristics, such as an aluminum alloy, such as 6061 aluminum alloy or 6063 aluminum alloy.
The inner conductor 102 may be hollow so long as the metal wall thickness meets the hardness requirement and is not deformed by force. A cooling copper tube can be inserted into the inner conductor 102, so that the multi-path microwave power distribution device based on the coaxial waveguide has better heat dissipation performance.
In one embodiment, the diameter of the inner conductor 102 decreases from the side of the inner conductor 102 facing the stepped frustoconical conductor 107 to the side of the inner conductor 102 facing away from the stepped frustoconical conductor 107. I.e. the side walls of the inner conductor 102 are inclined with respect to the inner side walls of the outer shell side body 101. The advantages of this arrangement include that the contact surface between the bottom surface of the side of the inner conductor 102 facing the stepped circular truncated cone conductor 107 and the first top surface is larger, so that the connection between the inner conductor 102 and the stepped circular truncated cone conductor 107 is firmer; in electromagnetic transmission performance, impedance matching between the input end and the stepped circular truncated cone conductor 107 is facilitated, and return loss of the input end is reduced.
In one embodiment, the length L of the inner conductor 102 1 20 mm-180 mm.
In one embodiment, the radius R of the bottom surface of the inner conductor 102 facing the side of the stepped frustoconical conductor 107 5 From 10mm to 12mm, e.g. R 5 10.15mm.
In one embodiment, the radius R of the top surface of the side of the inner conductor facing away from the stepped frustoconical conductor 4 Is 10mm to 12mm, and R 4 Less than or equal to R 5 。
In other embodiments, the diameters of the inner conductor members are uniformly set from the side of the inner conductor member facing the stepped circular truncated cone conductor member to the side of the inner conductor member facing away from the stepped circular truncated cone conductor member.
In one embodiment, the shape of the opening 108 is a truncated cone, and the diameter of the pattern of the intersection of the opening 108 with the outer sidewall of the housing side body 101 is smaller than the diameter of the pattern of the intersection of the opening 108 with the inner sidewall of the housing side body 101. The advantages of this arrangement are that: the opening 108 adopts a conical tapered mode to realize input/output impedance matching so as to achieve the purpose of reducing port reflection.
In one embodiment, the diameter (2R 2 ) From 3mm to 7mm, e.g. 2R 2 Is 3mm. Radius R of pattern of the opening intersecting with outer side wall of the case side body 1 Radius R of the conductor bar in the output end 2 The ratio range k of (2) satisfies
In a specific embodiment, the diameter (2R) of the pattern of the opening 108 intersecting the outer sidewall of the outer shell side body 101 1 ) From 10mm to 16mm, e.g. R 1 Is 5mm.
The diameter of the pattern in which the opening 108 intersects the inner wall of the outer case side body 101 is 20mm to 30mm.
The diameter of the pattern of the opening 108 intersecting the outer side wall of the housing side body 101 is equal to the outer diameter of the joint outer conductor.
The openings 108 have a certain interval, so that a certain isolation degree is ensured between the output ports, and mutual interference is avoided.
The output end inner conductor rod 103 can be made of alloy materials which meet the electrical characteristics, such as aluminum alloys 6061 and 6063.
In one embodiment, one end of the output end inner conductor rod 103 is embedded in the stepped circular truncated cone conductor 107, so that the output end inner conductor rod 103 is connected with the stepped circular truncated cone conductor 107 more firmly.
The output end inner conductor rod 103 has a rod-shaped structure, and the extending direction of the output end inner conductor rod 103 is perpendicular to the central axis of the shell side body 101.
A plurality of the output end inner conductor bars 103 are uniformly distributed around the central axis of the outer housing side body 101. And the distance between the inner conductor rod 103 of each output end and the bottom plate 101a is uniform. The output end inner conductor rods 103 are arranged at intervals.
The diameter of each of the output end inner conductor bars 103 is equal in value to the diameter of the pattern of intersection of the opening and the outer side wall of the outer case side body.
The material of the stepped truncated cone conductor 107 may be an alloy material that meets the electrical characteristics, such as aluminum alloys 6061 and 6063.
The stepped circular truncated cone conductor 107 comprises a body region 1701 and a disc bottom region 1702 connected with the body region 1701, wherein the disc bottom region 1702 is positioned between the body region 1701 and the bottom plate 101 a; a side surface of the body region 1701 facing the inner conductor 102 is a first top surface; the body region 1701 includes first to nth sub-body regions 1701c to 1701c connected in sequence in a direction from the bottom plate 101a to the inner conductor 102, and diameters of the first to nth sub-body regions 1701c to 1701c are reduced in sequence so that a sidewall of the body region 1701 has a stepped step, N being an integer greater than or equal to 2. The diameter of any kth sub-body region is uniform in the direction of the central axis of the body region, k being an integer greater than or equal to 1 and less than or equal to N.
In the present embodiment, taking N equal to 3 as an example, the body region 1701 includes a first sub-body region 1701c, a second sub-body region 1701b, and a third sub-body region 1701a connected in this order in the direction from the bottom plate 101a to the inner conductor 102. In other embodiments, N may also be an integer greater than or equal to 4.
The disc bottom region 1702 includes a second sub-disc region 1702a to an mth sub-disc region sequentially connected in a direction from the inner conductor 102 to the bottom plate 101a, the second sub-disc region 1702a being connected 1701c to the first sub-body region. The diameters of the first sub-body land junction 1701c through the Mth sub-disk land decrease in sequence.
When M is equal to 2, the disc bottom area only comprises a second sub-disc area, the diameter of the second sub-disc area is uniform in the central axis direction of the disc bottom area, and the diameter of the second sub-disc area is smaller than that of the first sub-body area. When M is greater than or equal to 3, the second sub-disc region 1702a to the M-th sub-disc region are sequentially connected in the central axis direction of the disc bottom region 1702, the M-th sub-disc region is located at one side of the second sub-disc region 1702a facing away from the first sub-body region, and the diameters of the first sub-body region connection 1701c to the M-th sub-disc region are sequentially reduced. The diameter of any one of the jth sub-disk regions is uniform in the direction of the central axis of the disk bottom region 1702, j being an integer greater than or equal to 1 and less than or equal to M.
In this embodiment, taking M equal to 3 as an example, the disc bottom region 1702 includes a second sub-disc region 1702a and a third sub-disc region 1702ab connected to the second sub-disc region 1702a, respectively. In other embodiments, M may also be an integer greater than 3.
The central axis of the disc bottom region 1702 coincides with the central axis of the body region 1701.
Each of the output end inner conductor bars 103 is fixedly connected with the side wall of the nth sub-body area. In this embodiment, when N is equal to 3, each of the output end inner conductor bars 103 is fixedly connected to a sidewall of the third sub-body area 1701c.
In this embodiment, the purpose of impedance matching can be achieved by optimizing the order N of the stepped circular truncated cone conductor 107 and the diameter dimension, thickness dimension and distance to the short road surface from the first sub-body region to the nth sub-body region, and the return loss of the input port can be reduced, thereby improving the energy transmission efficiency.
In a specific embodiment, N is 3 to 7.
In a specific embodiment, the stepped frustoconical conductor 107 is chamfered to provide a uniform internal field distribution and to prevent tip discharge effects. Specifically, the vertex angle formed by the side wall of any k sub-body area and the surface of the k sub-body area on the side opposite to the bottom plate is chamfered. K is an integer greater than or equal to 1 and less than or equal to N.
In one embodiment, the number of openings 104 is 8 to 20.
The center axis of the inner conductor 102, the center axis of the stepped truncated cone conductor 107, and the center axis of the outer case 101 overlap.
The closer the equivalent impedance of the input end space channel is to the parallel equivalent impedance of the coaxial output end space channels, the better the microwave transmission performance is. In order to reduce the discontinuity of the input end space channel and the output end space channel, a stepped round table conductor is designed to form a transition space channel by referring to the principle of a chebyshev impedance transformer. The structure is the key of the design of the power divider model, and in order to ensure the structural symmetry, the stepped round table conductor piece and the inner conductor piece are positioned on the same central axis and are connected with the short circuit surface of the inner conductor piece.
The space channel of the output end is spliced with the outer conductor of the connector.
The multi-channel microwave power distribution device based on the coaxial waveguide can be expanded to other frequency bands by adjusting various structural parameters according to the principle of the wavelength common transition effect; the number of the output ports can be designed to be 12-20 according to the requirement.
The power divider can be realized by numerical control lathe processing or 3D printing technology, and comprises the following specific steps: processing the outer conductor shell by a numerical control lathe or a 3D printing technology; machining a truncated cone-shaped opening on the side wall of the side body of the shell in an electric spark mode; and processing the inner conductor and the stepped circular truncated cone conductor by a numerical control lathe or a 3D printing technology, and welding the inner conductor and the stepped circular truncated cone conductor together.
In the present embodiment, S 1 Is the diameter, S, of the third sub-body region 1701c 2 Is the diameter, S, of the second sub-body region 1701b 3 Is the diameter of the first sub-body region 1701a. S is S 4 Is the diameter, S, of the first sub-disc region 1702a 5 Is the diameter of the second sub-disc region 1702 b.h1 is the height of the third sub-body region 1701c, h2 is the height of the second sub-body region 1701b, and h3 is the height of the first sub-body region 1701a. h4 is the height of the first sub-disc region 1702a and h5 is the height of the second sub-disc region 1702 b. L (L) 1 L is the height of the inner conductor 102 2 Is the width between the inner side wall of the shell side body and the outer side wall of the shell side body. L (L) 3 Is the distance between the outer side wall of the shell side body and the central axis of the stepped truncated cone conductor.
The structure is optimized by utilizing finite element electromagnetic simulation software, and parameters of each optimized structure are R 3 ＝43.5mm,R 4 ＝5.9mm,R 5 ＝10.15mm，L 1 ＝167mm，L 2 ＝10mm，L 3 =53.7mm. The remaining parameters are shown in table 1:
table 1 structural optimization parameter values
| s 1 | s 2 | s 3 | s 4 | s 5 |
| 77mm | 62mm | 44mm | 59.7mm | 37.6mm |
| h 1 | h 2 | h 3 | h 4 | h 5 |
| 13mm | 17mm | 9.5mm | 16.7mm | 4.5mm |
Through simulation, a Voltage Standing Wave Ratio (VSWR) simulation result of the 16-path power divider is finally obtained, and is shown in fig. 4, it can be seen that the return loss is better than-20 dB in the frequency range of 2.3 GHz-2.6 GHz, and the port standing wave ratio is smaller than 1.3; in the frequency range of 2.4 GHz-2.5 GHz, the VSWR is better than 1.1. As shown in the simulation result of the S parameter, for the 16-path power divider, the ideal transmission coefficient of each port is-12 dB, and as can be seen from the figure 5, the transmission coefficients S2, 1-S17, 1 are in the range of-12.15 to-12.00 dB, and the transmission effect is ideal. The test result shows that the power distribution device can realize low-loss multipath constant-amplitude in-phase output.
It is apparent that the above examples are given by way of illustration only and are not limiting of the embodiments. Other variations or modifications of the above teachings will be apparent to those of ordinary skill in the art. It is not necessary here nor is it exhaustive of all embodiments. While still being apparent from variations or modifications that may be made by those skilled in the art are within the scope of the invention.
Claims (15)
1. A coaxial waveguide-based multipath microwave power distribution device, comprising:
an outer conductor housing including an annular outer housing side body and a bottom plate; the bottom plate is connected with one side port of the shell side body;
an inner conductor surrounded by the outer shell side body and a stepped truncated cone conductor; the stepped round platform conductor piece is positioned between the inner conductor piece and the bottom plate; the stepped round platform conductor piece is provided with a first top surface, a first bottom surface and a first side wall, wherein the first top surface and the first bottom surface are oppositely arranged, and the first side wall is connected with the first top surface and the first bottom surface; the inner conductor piece is fixedly connected with part of the first top surface;
the area of the shell side body, which is close to the bottom plate, is provided with a plurality of openings which penetrate through the shell side body from the inner side wall of the shell side body to the outer side wall of the shell side body; a plurality of openings are uniformly distributed around the central shaft of the side body of the shell;
the output end inner conductor rods are in one-to-one correspondence with the openings, one end of each output end inner conductor rod is fixedly connected with the first side wall, and the other end of each output end inner conductor rod extends into the opening;
an output end space channel is formed between the output end inner conductor rod and the side wall of the opening, an input end space channel is formed between the inner conductor piece and the inner side wall of the shell side body, a transition space channel is formed between the stepped round platform conductor piece and the inner side wall of the shell side body, and the transition space channel is communicated with the output end space channel and the input end space channel;
the stepped round platform conductor piece comprises a body area and a disc bottom area connected with the body area, and the disc bottom area is positioned between the body area and the bottom plate; a side surface of the body region facing the inner conductor member is a first top surface; the body region comprises a first sub-body region to an N-th sub-body region which are sequentially connected in the direction from the bottom plate to the inner conductor, and the diameters of the first sub-body region to the N-th sub-body region are sequentially reduced, so that the side wall of the body region is provided with a step; the inner conductor rod of each output end is fixedly connected with the side wall of the first sub-body area; n is an integer greater than or equal to 2; the disc bottom area comprises a second sub-disc area to an Mth sub-disc area which are sequentially connected in the direction from the inner conductor piece to the bottom plate, the second sub-disc area is connected with the first sub-body area, and the diameters of the first sub-body area to the Mth sub-disc area are sequentially reduced;
the opening is connected with the outer side of the side body of the shellRadius R of wall-intersecting pattern 1 Radius R of the conductor bar in the output end 2 The ratio range k of (2) satisfies R 1 /R 2 K, k is greater than or equal to 2.28 and less than or equal to 3.33.
2. The coaxial waveguide-based multipath microwave power distribution device according to claim 1, wherein the opening is shaped as a truncated cone; the diameter of the pattern where the opening intersects the outer side wall of the outer case side body is smaller than the diameter of the pattern where the opening intersects the inner side wall of the outer case side body.
3. The coaxial waveguide-based multipath microwave power distribution device according to claim 2, wherein the diameter of the pattern of the intersection of the opening and the outer side wall of the outer shell side body is 10 mm-16 mm; the diameter of the pattern of crossing the opening and the inner side wall of the shell side body is 20 mm-30 mm.
4. The coaxial waveguide-based multiplexing microwave power distribution device according to claim 1, wherein one end of the inner conductor rod of the output end is embedded into a stepped circular truncated cone conductor.
5. The coaxial waveguide-based multiplexing microwave power distribution device according to claim 4, wherein the output end inner conductor rod has a rod-like structure, and the extending direction of the output end inner conductor rod is perpendicular to the central axis of the outer shell side body.
6. The coaxial waveguide-based multipath microwave power distribution device according to claim 4, wherein the diameter of the conductor rod in the output end is equal to 3 mm-7 mm.
7. The coaxial waveguide-based multipath microwave power distribution device of claim 1, wherein the stepped frustoconical conductor is of tapered configuration.
8. The coaxial waveguide-based multiplexing microwave power distribution device according to claim 1, wherein the diameter of the inner side wall of the outer case side body is uniform and unchanged in the direction of the central axis of the outer case side body.
9. The coaxial waveguide-based multipath microwave power distribution device according to claim 8, wherein the diameter corresponding to the inner side wall of the side body of the outer shell is 80 mm-100 mm.
10. The coaxial waveguide-based multiplexing microwave power distribution device of claim 1, wherein the diameter of the inner conductor decreases from a side of the inner conductor facing the stepped-mesa conductor to a side of the inner conductor facing away from the stepped-mesa conductor.
11. The coaxial waveguide-based multiplexed microwave power distribution device according to claim 10, wherein the length L of the inner conductor member 1 20mm to 180mm.
12. The coaxial waveguide-based multiplexed microwave power distribution device according to claim 10, wherein the radius R of the bottom surface of the inner conductor facing one side of the stepped-mesa conductor 5 Is 10mm to 12mm.
13. The coaxial waveguide-based multiplexed microwave power distribution device according to claim 12, wherein the radius R of the top surface of the side of the inner conductor facing away from the stepped-mesa conductor 4 Is 10mm to 12mm, and R 4 Less than or equal to R 5 。
14. The coaxial waveguide-based multipath microwave power distribution device of claim 1, wherein the number of openings is 8-20.
15. The coaxial waveguide-based multiplexed microwave power distribution device of claim 1, wherein the central axis of the inner conductor, the central axis of the stepped frustoconical conductor, and the central axis of the outer housing side body coincide.
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106532215A (en) * | 2016-12-16 | 2017-03-22 | 华南理工大学 | High-isolation multi-path radial power divider/synthesizer |
| CN106992348A (en) * | 2017-04-14 | 2017-07-28 | 电子科技大学 | The broadband radial waveguide power divider/synthesizer of one species cycloid transition structure |
| WO2022062842A1 (en) * | 2020-09-26 | 2022-03-31 | 杭州三花研究院有限公司 | Sensor assembly and heat exchange device |
| CN114374068A (en) * | 2022-01-14 | 2022-04-19 | 中国人民解放军国防科技大学 | Combiner based on novel radial line waveguide |
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106532215A (en) * | 2016-12-16 | 2017-03-22 | 华南理工大学 | High-isolation multi-path radial power divider/synthesizer |
| CN106992348A (en) * | 2017-04-14 | 2017-07-28 | 电子科技大学 | The broadband radial waveguide power divider/synthesizer of one species cycloid transition structure |
| WO2022062842A1 (en) * | 2020-09-26 | 2022-03-31 | 杭州三花研究院有限公司 | Sensor assembly and heat exchange device |
| CN114374068A (en) * | 2022-01-14 | 2022-04-19 | 中国人民解放军国防科技大学 | Combiner based on novel radial line waveguide |
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