CN218648111U - Waveguide orthogonal mode converter - Google Patents

Abstract

The utility model provides a waveguide orthomode converter, including two ridge waveguide polarization separators, first curved waveguide, the curved waveguide of second and waveguide power combiner. The double-ridge waveguide polarization separator is used for separating two mutually orthogonal linear polarization waves synchronously transmitted in the same waveguide in respective polarization directions, one path of separated signals is transmitted to the waveguide power combiner through the first bent waveguide and is output after being combined, and the other path of separated signals is transmitted through the second bent waveguide. The double-ridge waveguide polarization splitter comprises a waveguide double ridge, and the cross-sectional area of the waveguide double ridge is gradually increased in the signal transmission direction. The utility model provides a waveguide orthomode converter through setting up the waveguide pair of ridges of gradual change, makes its structure highly compatible 3-D print technology, and mechanical strength is higher, has reduced the polarization separation structure and has printed the risk that in-process deformation and chamber wall damage, collapse at 3-D, has promoted the shaping quality that waveguide orthomode converter integration vibration material disk made.

Description

Waveguide orthogonal mode converter

Technical Field

The utility model belongs to the technical field of electromagnetic field and microwave, more specifically say, relate to a waveguide orthomode converter.

Background

The waveguide orthogonal mode converter is generally used in modern communication systems such as satellite communication and radio astronomy, can synthesize or separate two orthogonal linear polarization waves at the same time, realizes the receiving and transmitting multiplexing of radio frequency signals without mutual interference, and improves the channel multiplexing capability of a satellite-ground communication system and the receiving and transmitting bandwidth of a communication link. The waveguide orthogonal mode converter is an important component of a dual-polarized antenna feed system, and needs to have the characteristics of low transmission loss, small reflection coefficient, high polarization isolation, compact structure and the like.

Waveguide orthogonal mode converters are mainly classified into three categories according to the characteristics of enabling structures: side arm type (Sidearm), cross knot type (Turntile) and

junction type, in which the structure of the side arm type is the simplest but it is difficult to achieve the radio frequency performance of the broadband, and cross junction type (turnsole) and

the junction enables broadband radio frequency performance. Cross knot type (Turntile) and

the core functional structure of the junction waveguide orthogonal mode converter comprises a polarization separator and a waveguide power combiner, and the polarization separator and the waveguide power combiner are communicated with each other through a multi-section bent waveguide to achieve the cavity structure. In contrast to this, the present invention is,

the structure of the junction waveguide orthogonal mode converter is complex, and in the traditional technology, the radio frequency performance of realizing the broadband high isolation usually needs to use a tuning needle, a metal diaphragm/clapboard or a ridge waveguide as an enabling structure for polarization separation. These structures, when manufactured using a Computer Numerical Control (CNC) mill, have the following problems: (1) The metal shell is required to be split into a plurality of pieces for processing under the CNC process, and then splicing and assembling are carried out, so that the manufacturing difficulty is high, and the construction period is long; (2) Discontinuities in the enable structure or assembly gaps due to processing errors can cause degradation in the radio frequency performance of the device; (3) CNC workerUnder the process, the redundant structural materials of the metal shell are more, the number of assembling fasteners is more, the weight of the device is large, and the lightening of the radio frequency front-end system is not facilitated.

An alternative processing solution for waveguide orthomode transducers is additive manufacturing techniques, i.e. 3-D printing. Although the traditional waveguide orthogonal mode converter can be manufactured and molded by adopting a 3-D printing process, the traditional structure of the waveguide orthogonal mode converter and the 3-D printing process have obvious contradiction, and the compatibility of the traditional structure and the 3-D printing process is poor, which is particularly shown in the following aspects: (1) The waveguide orthogonal mode converter with the inner cavity is difficult to be integrally formed by 3-D printing; (2) The suspension structure in the inner cavity needs to be supported in the 3-D printing process, but the support structure in the inner cavity is difficult to remove after the process is finished; (3) The ridges, the membranes and other fine structures in the inner cavity are easy to deform; (4) The influence of the deformation caused by 3-D printing materials and the process on the radio frequency performance of the waveguide orthogonal mode converter is large; (5) The surface quality of a discontinuous structure such as the gradual change of a stepped waveguide of the waveguide orthogonal mode converter is poor after 3-D printing and forming, and the problems of breakage, printing material residue and the like are easy to occur. For example, conventionally enabled by stepped ridge waveguides

The junction waveguide orthogonal mode converter is small in thickness of the step ridge, has sharp edge and corner and other abrupt structures, is easy to deform or damage in the post-processing of 3-D printing, is not beneficial to metallization of the surface of a non-metal 3-D printing structure, and is easy to cause deterioration of device isolation and return loss when the 3-D printing step ridge structure is printed; in addition, the step ridge is a suspension structure in the waveguide, and the use of a supporting material is difficult to avoid in the 3-D printing and forming process.

SUMMERY OF THE UTILITY MODEL

An object of the embodiment of the utility model is to provide a waveguide orthomode converter, when obtaining broadband, high isolation and low-loss radio frequency performance, solve among the prior art ladder double ridge waveguide orthomode converter inner chamber need support and ladder ridge technical problem such as easy deformation when adopting 3-D printing technology to make.

In order to achieve the above object, the utility model adopts the following technical scheme: the utility model provides a waveguide orthomode converter, includes double-ridge waveguide polarization separator, two first curved waveguide, a second curved waveguide and waveguide power combiner, two first curved waveguide symmetry sets up, two first curved waveguide and one the second curved waveguide all connect in double-ridge waveguide polarization separator, and two first curved waveguide is kept away from double-ridge waveguide polarization separator's one end all with waveguide power combiner connects, double-ridge waveguide polarization separator is used for separating two mutually orthogonal linear polarization waves of synchronous transmission in the same waveguide on respective polarization direction, and one way signal after the separation is transmitted by two first curved waveguide to waveguide power combiner, exports after power synthesis, another way signal by second curved waveguide transmission and output, double-ridge waveguide polarization separator includes the waveguide double-ridge, the cross-sectional area of waveguide double-ridge becomes gradually in signal transmission direction.

Optionally, the double-ridge waveguide polarization splitter is arranged symmetrically about its central axis, and the waveguide power combiner is arranged symmetrically about its central axis.

Optionally, the waveguide double ridge includes two symmetrically arranged trapezoid table structures, and each trapezoid table structure includes at least two trapezoid table units stacked in sequence along the signal transmission direction.

Optionally, the waveguide power combiner includes two connecting waveguides and a combining waveguide, one end of each of the two connecting waveguides is connected to the two first curved waveguides, and the other end of each of the two connecting waveguides is connected to the combining waveguide.

Optionally, an included angle between the central axis of the connecting waveguide and the central axis of the combined waveguide is between 90 degrees and 150 degrees, and an included angle between the central axes of the two connecting waveguides is between 60 degrees and 180 degrees.

Optionally, the double-ridge waveguide polarization splitter and the second bending waveguide are connected by a first transition waveguide.

Optionally, the waveguide orthogonal mode converter further includes a first waveguide flange and a second waveguide flange, the first waveguide flange is connected to the double-ridge waveguide polarization separator, the first waveguide flange is provided with a first rectangular waveguide port, and the first rectangular waveguide port and the double-ridge waveguide polarization separator are connected by a second transition waveguide; the second waveguide flange plate is provided with a second rectangular waveguide port and a third rectangular waveguide port, the second rectangular waveguide port is connected with the waveguide power combiner, the third rectangular waveguide port is connected with the second bent waveguide, and the long side of the second rectangular waveguide port is perpendicular to the long side of the third rectangular waveguide port.

Optionally, a long side of the first rectangular waveguide port is parallel to a long side of the second rectangular waveguide port, or the long side of the first rectangular waveguide port is parallel to a long side of the third rectangular waveguide port.

Optionally, the waveguide orthomode transducer is a metal housing having an inner cavity, the inner cavity being smoothly arranged.

Optionally, the metal shell is provided with a process hole or a process groove.

The utility model provides a waveguide orthomode converter's beneficial effect lies in: compared with the prior art, the waveguide orthogonal mode converter of the utility model replaces the traditional stepped and abrupt waveguide double-ridge structure to realize the broadband polarization separation function by arranging the waveguide double-ridge structure with gradually changed cross section shape and area, and the gradually changed waveguide double-ridge structure is highly compatible with the 3-D printing process; the waveguide orthogonal mode converter is designed to be directionally shaped along the vertical printing direction by fusing the 3-D printing process principle, so that a support structure is used as little as possible in the additive manufacturing and forming process, the symmetry of a key structure of the support structure is not damaged, and the risks of deformation, cavity wall damage and collapse of the 3-D printing structure are obviously reduced; the inner contour of the metal shell of the waveguide orthomode transducer is designed to be enclosed by smooth and continuous planes and curved surfaces, which is beneficial to improving the metallization quality of the inner surface of the 3-D printing shell. The improvement improves the quality of the waveguide orthogonal mode converter integrally manufactured and molded by adopting a 3-D printing process.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the embodiments or the prior art descriptions will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without inventive labor.

Fig. 1 is a three-dimensional structure diagram of a waveguide orthogonal mode converter for measuring the radio frequency performance in the vertical polarization direction according to an embodiment of the present invention;

fig. 2 is a three-dimensional structure diagram of a waveguide orthogonal mode converter for measuring the horizontal polarization direction radio frequency performance according to an embodiment of the present invention;

FIG. 3 is a perspective view of the waveguide orthogonal mode converter of FIG. 1 from another perspective;

FIG. 4 is a cross-sectional view taken along the plane X-X in FIG. 3;

FIG. 5 is a cross-sectional view taken along the plane Y-Y in FIG. 3;

fig. 6 is a simulated scattering parameter curve diagram of a waveguide power combiner of a waveguide orthogonal mode converter according to an embodiment of the present invention;

fig. 7 is a graph of simulated scattering parameters of a dual-ridge waveguide polarization splitter of a waveguide orthomode converter (without a second transition waveguide) in a vertical polarization direction according to an embodiment of the present invention;

fig. 8 is a graph of simulated scattering parameters of a dual-ridge waveguide polarization splitter of a waveguide orthogonal mode converter (without a second transition waveguide) in a horizontal polarization direction according to an embodiment of the present invention;

fig. 9 is a scattering parameter (S) simulated and measured in the vertical polarization direction of a waveguide orthogonal mode converter (including a second transition waveguide) according to an embodiment of the present invention ^V ₁₁ 、S ^V ₂₁ And S ^V ₃₁ ) A graph;

FIG. 10 shows a schematic view of an embodiment of the present inventionSimulated and measured scattering parameters (S) of a waveguide orthomode transducer (comprising a second transition waveguide) in the horizontal polarization direction ^H ₁₁ 、S ^H ₂₁ And S ^H ₃₁ ) A graph;

FIG. 11 shows the transmission coefficient S in FIGS. 9 and 10 ^V ₂₁ And S ^H ₃₁ A pull-in view of the curve;

fig. 12 shows transmission coefficients S of a waveguide orthogonal mode converter (including a second transition waveguide) simulated and measured in vertical polarization and horizontal polarization directions according to an embodiment of the present invention ^V ₃₂ And S ^H ₃₂ Graph is shown.

Wherein, in the figures, the respective reference numerals:

1-double ridge waveguide polarization separator; 11-waveguide double ridge; 111-a trapezoidal table unit; 2-a first curved waveguide; 3-a second curved waveguide; 4-waveguide power combiners; 41-connecting the waveguides; 42-a bonded waveguide; 5-a first waveguide flange; 51-a first rectangular waveguide port; 6-a second waveguide flange; 61-a second rectangular waveguide port; 62-a third rectangular waveguide port; 7-a second transition waveguide; 8-first transition waveguide.

Detailed Description

In order to make the technical problem, technical solution and advantageous effects to be solved by the present invention more clearly understood, the following description is given in conjunction with the accompanying drawings and embodiments to illustrate the present invention in further detail. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

It will be understood that when an element is referred to as being "disposed on" another element, it can be directly on the other element or be indirectly on the other element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or be indirectly connected to the other element.

It will be understood that the terms "length," "width," "upper," "lower," "front," "rear," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like, are used in the orientation or positional relationship indicated in the drawings for convenience in describing the invention and to simplify the description, and do not indicate or imply that the device or element so referred to must have a particular orientation, be constructed in a particular orientation, and be constructed in a particular manner of operation, and are not to be construed as limiting the invention.

Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless specifically limited otherwise.

The waveguide orthogonal mode converter provided by the embodiment of the present invention will now be described.

Referring to fig. 1 to 5, fig. 1 is a perspective view of a waveguide orthogonal mode converter for measuring radio frequency performance in a vertical polarization direction according to an embodiment of the present invention, fig. 2 is a perspective view of a waveguide orthogonal mode converter for measuring radio frequency performance in a horizontal polarization direction according to an embodiment of the present invention, fig. 3 is a perspective view of another view angle of the waveguide orthogonal mode converter in fig. 1, fig. 4 is a cross-sectional view along an X-X plane in fig. 3, and fig. 5 is a cross-sectional view along a Y-Y plane in fig. 3.

The waveguide orthogonal mode converter comprises a double-ridge waveguide polarization separator 1, two first bending waveguides 2, a second bending waveguide 3 and a waveguide power combiner 4, wherein the two first bending waveguides 2 are symmetrically arranged, the two first bending waveguides 2 and the second bending waveguide 3 are connected to the double-ridge waveguide polarization separator 1, and one ends, far away from the double-ridge waveguide polarization separator 1, of the two first bending waveguides 2 are connected with the waveguide power combiner 4. The double-ridge waveguide polarization separator 1 is used for separating two mutually orthogonal linear polarization waves synchronously transmitted in the same waveguide in respective polarization directions, one path of separated signals is transmitted to the waveguide power combiner 4 through the two first curved waveguides 2 and is output after power combination, and the other path of signals is transmitted and output through the second curved waveguide 3. Specifically, two mutually orthogonal polarized waves transmitted synchronously are separated into two mutually orthogonal (horizontally polarized and vertically polarized) signals after passing through the double-ridge waveguide polarization separator 1, wherein one signal is directly transmitted by the second curved waveguide 3, the other signal is separated into two equal-amplitude reverse-phase signals in the double-ridge waveguide polarization separator 1 and is transmitted to the waveguide power combiner 4 through the two symmetrically arranged first curved waveguides 2, and the two equal-amplitude reverse-phase signals are combined into one signal in the waveguide power combiner 4.

The double-ridge waveguide polarization separator 1 comprises a waveguide double ridge 11, the cross section area of the waveguide double ridge 11 is gradually increased in the signal transmission direction, the size of the cross section area is continuously changed and does not suddenly change, so that the waveguide double ridge 11 is of a smoothly-transitional gradual-change double ridge structure, the traditional stepped sudden-change double ridge structure is replaced, the broadband polarization separation function is realized, and the gradual-change double ridge structure is highly compatible with a 3-D printing process.

The waveguide orthogonal mode converter in the embodiment of the utility model has the advantages that the waveguide orthogonal mode converter replaces the traditional stepped and abrupt waveguide double-ridge structure to realize the broadband polarization separation function by setting the waveguide double-ridge 11 structure with gradually changed cross section shape and area, and the gradually changed waveguide double-ridge structure is highly compatible with the 3-D printing process; the waveguide orthogonal mode converter is designed to be directionally shaped along the vertical printing direction by fusing the 3-D printing process principle, so that a support structure is used as little as possible in the additive manufacturing and forming process, the symmetry of a key structure of the support structure is not damaged, and the risks of deformation, cavity wall damage and collapse of the 3-D printing structure are obviously reduced; the inner contour of the metal shell of the waveguide orthomode transducer is designed to be enclosed by smooth and continuous planes and curved surfaces, which is beneficial to improving the metallization quality of the inner surface of the 3-D printing shell. The improvement improves the quality of the waveguide orthogonal mode converter integrally manufactured and molded by adopting a 3-D printing process.

In one embodiment of the present invention, please refer to fig. 3, the dual ridge waveguide polarization splitter 1 is symmetrically disposed about the central axis thereof, i.e., the dual ridge waveguide polarization splitter 1 is a symmetrically disposed structure. The waveguide power combiner 4 is also a symmetrically arranged structure, symmetrically arranged about its central axis.

Wherein, the protruding waveguide double ridge 11 that is provided with of double ridge waveguide polarization separator 1's inner wall, the waveguide double ridge 11 includes the trapezoidal platform structure that two symmetries set up, and every trapezoidal platform structure all includes two at least trapezoidal platform units 111, and the junction of two adjacent trapezoidal platform units 111 sets up in succession, does not have the structure sudden change, and a plurality of trapezoidal platform units 111 stack gradually along the signal transmission direction. It will be appreciated that there could theoretically be an infinite number of trapezoidal stage units 111, making the surface of the trapezoidal stage structure a continuous smooth curved surface.

In one embodiment of the present invention, the waveguide orthomode converter is a metal shell having an inner cavity, the inner cavity respectively penetrates through the dual-ridge waveguide polarization splitter 1, the two first curved waveguides 2, the one second curved waveguide 3 and the waveguide power combiner 4, the inner cavity is smoothly arranged and is formed by enclosing a continuous curved surface and a plane, and no discontinuous structure exists inside the metal shell. The waveguide orthogonal mode converter is designed by completely fusing the 3-D printing process principle, the compatibility of the metal shell structure and the 3-D printing process is extremely high, and the reliability of the waveguide orthogonal mode converter integrally manufactured by adopting the 3-D printing process is obviously improved.

The metal shell is provided with the fabrication hole or the fabrication groove, so that plating solution can flow inside and outside the fabrication hole or the fabrication groove when the metal shell is metallized, and the quality of a plating layer on the inner surface of the metal shell is improved.

In one embodiment of the present invention, please refer to fig. 3 and 4, the waveguide power combiner 4 includes two connecting waveguides 41 and a combining waveguide 42, one end of the two connecting waveguides 41 is respectively connected to the two first bending waveguides 2, and the other end of the two connecting waveguides 41 is connected to the combining waveguide 42, so that the waveguide power combiner 4 is Y-shaped, and thus, equal amplitude and opposite phase signals transmitted by the two connecting waveguides 41 can be combined into one path in the combining waveguide 42.

Optionally, the waveguide power combiner 4 is of a symmetrical structure and is arranged symmetrically with respect to the central axis of the combined waveguide 42. The central axis of the waveguide power combiner 4 (combined with the central axis of the waveguide 42) may coincide with the central axis of the double-ridge waveguide polarization separator 1.

Optionally, the included angle between the central axis of the connecting waveguide 41 and the central axis of the connecting waveguide 42 is between 90 degrees and 150 degrees, such as 120 degrees, 130 degrees, 135 degrees, and the like. The included angle between the central axes of the two connecting waveguides 41 is 60 degrees to 180 degrees, such as 60 degrees, 90 degrees, 120 degrees, and the like.

In one embodiment of the present invention, please refer to fig. 3, the dual-ridge waveguide polarization splitter 1 is connected to the second curved waveguide 3 through the first transition waveguide 8, and the end of the second curved waveguide 3 away from the dual-ridge waveguide polarization splitter 1 is usually provided with a standard waveguide flange for facilitating the connection test. In order to ensure the transmission performance of the waveguide orthogonal mode converter, the size of the waveguide port of the double-ridge waveguide polarization separator 1 is often different from that of the waveguide port on a standard waveguide flange, so that a first transition waveguide 8 is arranged between the double-ridge waveguide polarization separator 1 and the second curved waveguide 3, and the sizes of the waveguide ports at two ends of the first transition waveguide 8 are different.

In one embodiment of the present invention, please refer to fig. 3 to 5, the waveguide orthogonal mode converter further includes a first waveguide flange 5 and a second waveguide flange 6, the first waveguide flange 5 is connected to the dual-ridge waveguide polarization splitter 1, and the second waveguide flange 6 is connected to the waveguide power combiner 4 and the second curved waveguide 3.

The first waveguide flange 5 is provided with a first rectangular waveguide port 51, and the first rectangular waveguide port 51 is connected with the double-ridge waveguide polarization separator 1 through a second transition waveguide 7. The waveguide common port of the double-ridge waveguide polarization splitter 1 is square, and the first rectangular waveguide port 51 is rectangular, so that the second transition waveguide 7 needs to be arranged for transition connection. A second rectangular waveguide port 61 and a third rectangular waveguide port 62 are formed in the second waveguide flange 6, the second rectangular waveguide port 61 is connected with the waveguide power combiner 4, and the third rectangular waveguide port 62 is connected with the second curved waveguide 3.

In one embodiment of the present invention, please refer to fig. 1, the long side of the first rectangular waveguide window 51 is parallel to the long side of the third rectangular waveguide window 62. In another embodiment of the present invention, please refer to fig. 2, the long side of the first rectangular waveguide window 51 is parallel to the long side of the second rectangular waveguide window 61.

In one embodiment of the present invention, please refer to fig. 1, the long side of the first rectangular waveguide window 51 is parallel to the long side of the third rectangular waveguide window 62. In another embodiment of the present invention, the long side of the first rectangular waveguide window 51 is parallel to the long side of the second rectangular waveguide window 61.

Referring to fig. 6, fig. 6 is a scattering parameter curve diagram of a simulation of a waveguide power combiner of a waveguide orthogonal mode converter according to an embodiment of the present invention. The reflection coefficients of the three ports of the waveguide power combiner 4 are all smaller than-26 dB, and the transmission coefficient curve presents ideal-3-dB equal power division response.

Referring to fig. 7 and 8, fig. 7 and 8 are graphs of simulated scattering parameters of a dual-ridge waveguide polarization splitter of a waveguide orthomode converter (without a second transition waveguide) in vertical and horizontal polarization directions, respectively, according to an embodiment of the present invention. In a Ka full frequency band and in a vertical polarization direction, the simulated port reflection coefficient is smaller than-18 dB, the transmission loss is smaller than 0.1dB, and the polarization isolation is larger than 76dB; in the vertical polarization direction, the port reflection coefficient is less than-19 dB, the transmission loss is less than 0.1dB, and the polarization isolation is greater than 67dB.

Verify in order to the experiment the utility model provides a waveguide orthomode converter possesses superior radio frequency performance, has carried out processing and radio frequency measurement to this waveguide orthomode converter. The device adopts photosensitive resin as a shell structure material, and is integrally printed and formed in a 3-D mode through a multi-nozzle ink-jet process, wherein the printing and forming direction is the vertical direction shown in figure 3. After printing is finished, all medium supports inside and outside the model can be heated, melted and removed, and the structure of the device cannot be damaged in the support removing process, so that the integrated molding of the model is not limited by the generation position and the number of the supports. And finally, polishing and cleaning the model, and plating copper on the whole surface of the model to obtain the final device.

Referring to fig. 9 to 12, fig. 9 shows the present inventionThe embodiment provides a simulated and measured scattering parameter (S) of a waveguide orthogonal mode converter (comprising a second transition waveguide) in the vertical polarization direction ^V ₁₁ 、S ^V ₂₁ And S ^V ₃₁ ) Fig. 10 is a graph showing simulated and measured scattering parameters (S) of a waveguide orthogonal mode converter (including a second transition waveguide) in a horizontal polarization direction according to an embodiment of the present invention ^H ₁₁ 、S ^H ₂₁ And S ^H ₃₁ ) FIG. 11 is a graph showing the transmission coefficient S in FIGS. 9 and 10 ^V ₃₁ And S ^H ₂₁ A pull-in view of the curve. Fig. 12 shows transmission coefficients S of a waveguide orthogonal mode converter (including a second transition waveguide) simulated and measured in vertical polarization and horizontal polarization directions according to an embodiment of the present invention ^V ₃₂ And S ^H ₃₂ Graph is shown. It can be seen that within the frequency range of 26.5-40GHz, the measured and simulated scattering parameter curves are consistent, the accuracy of the simulation result and the reliability of the processing technology are verified, and the excellent radio frequency performance of the waveguide orthogonal mode converter is also verified. In the vertical polarization direction, the measured port reflection coefficient is less than-18 dB, the measured transmission loss is less than 0.35dB, the measured polarization isolation is more than 45dB, and the measured port isolation is more than 40dB; in the horizontal polarization direction, the measured port reflection coefficient is less than-17 dB, the measured transmission loss is less than 0.45dB, the measured polarization isolation is more than 45dB, and the measured port isolation is more than 50dB.

The partial critical dimensions of the waveguide orthogonal mode converter corresponding to the scattering parameter curves simulated in fig. 6 to 12 are as follows.

All rectangular waveguide ports: the length of the wide side is 7.112 mm, and the length of the narrow side is 3.556 mm;

second transition waveguide 7: the length is 20 mm, and the side length of the square waveguide is 7.112 mm;

double-ridge waveguide polarization separator 1: each trapezoidal platform structure comprises two trapezoidal platform units 111, the length of the wide side of the top of the first trapezoidal platform unit 111 is 1.2 mm, the length of the narrow side is 0.156 mm, the length of the wide side of the platform between the first trapezoidal platform unit 111 and the second trapezoidal platform unit 111 is 2.9 mm, the length of the narrow side is 1.556 mm, the length of the wide side of the bottom of the second trapezoidal platform unit 111 is 6.8 mm, the length of the narrow side is 2.156 mm, the height of the first trapezoidal platform unit 111 in the signal transmission direction is 8.2 mm, and the height of the second trapezoidal platform unit 111 in the signal transmission direction is 2.9 mm.

It should be emphasized once more that, firstly, the waveguide orthomode converter provided by the embodiment of the present invention integrates the process principle of 3-D printing to design, has a smooth inner cavity surface profile, and has no discontinuity structure of any sudden change inside the cavity, and the waveguide orthomode converter can be integrally manufactured and molded, and has extremely high compatibility of the structure to the 3-D printing process, and can further perform smooth shaping on the first waveguide flange 5 and the second waveguide flange 6, so as to reduce the weight thereof and reduce the use of supporting materials in the molding process; secondly, the printing and forming in the vertical direction shown in fig. 3 can maintain the structural symmetry of the double-ridge waveguide polarization separator 1, and reduce the deterioration of the device isolation caused by the deformation of the 3-D printing structure to the maximum extent.

In the embodiments provided herein, it should be understood that first, the disclosed shaping design methods and exemplary shaping structures may be universally applied to other microwave devices. For example, the trapezoidal gradually-changed double ridges can be widely applied to passive devices such as ridge waveguide power dividers and magic tees. Secondly, the geometric structure and the size of the cavity participating in the shaping are only schematic, and in practical application, the cavity structure used for shaping can be flexibly selected according to radio frequency indexes, space size, electromagnetic wave mode distribution rules and the like. For example, the structure of the waveguide double ridge 11 can be further optimized, the size of the waveguide can be scaled according to the working frequency band of the device, and the orientation of the polarized output port can be customized according to the application requirements.

The above is a description of the waveguide orthogonal mode converter provided by the present invention, and for those skilled in the art, there are changes in the embodiments and the application scope according to the idea of the embodiments of the present invention. In summary, the content of the present description should not be construed as a limitation of the present invention.

Claims (10)

1. A waveguide quadrature mode converter, characterized by: including two ridge waveguide polarization separators, two first curved waveguide, a second curved waveguide and waveguide power combiner, two first curved waveguide symmetry sets up, two first curved waveguide and one the second curved waveguide all connect in two ridge waveguide polarization separators, and two first curved waveguide is kept away from the one end of two ridge waveguide polarization separators all with waveguide power combiner connects, two ridge waveguide polarization separators are used for separating two mutually orthogonal's of synchronous transmission in the same waveguide line polarization ripples on respective polarization direction, and the signal of the same way after the separation is by two first curved waveguide transmits extremely waveguide power combiner exports after power synthesis, another route signal by the transmission of second curved waveguide is exported, two ridge waveguide polarization separators include the waveguide pair spine, the cross-sectional area of the waveguide pair spine grow gradually in the signal transmission direction.

2. The waveguide orthomode transducer of claim 1, wherein: the double-ridge waveguide polarization separator is arranged symmetrically about the central axis, and the waveguide power combiner is arranged symmetrically about the central axis.

3. The waveguide orthomode transducer of claim 2, wherein: the waveguide double ridges comprise two trapezoidal platform structures which are symmetrically arranged, and each trapezoidal platform structure comprises at least two trapezoidal platform units which are sequentially stacked along the signal transmission direction.

4. The waveguide orthomode transducer of claim 1, wherein: the waveguide power combiner comprises two connecting waveguides and a combined waveguide, one end of each of the two connecting waveguides is connected with the two first bending waveguides, and the other end of each of the two connecting waveguides is connected with the combined waveguide.

5. The waveguide orthomode transducer of claim 4, wherein: the included angle of the central axis of the connecting waveguide and the central axis of the combined waveguide is between 90 and 150 degrees, and the included angle of the central axis of the connecting waveguide is between 60 and 180 degrees.

6. The waveguide orthomode transducer of claim 1, wherein: the double-ridge waveguide polarization separator and the second bending waveguide are connected through a first transition waveguide.

7. The waveguide orthomode transducer of claim 1, wherein: the waveguide orthogonal mode converter further comprises a first waveguide flange and a second waveguide flange, wherein a first rectangular waveguide port is formed in the first waveguide flange, and the first rectangular waveguide port is connected with the double-ridge waveguide polarization separator through a second transition waveguide; and a second rectangular waveguide port and a third rectangular waveguide port are formed on the second waveguide flange plate, the second rectangular waveguide port is connected with the waveguide power combiner, and the third rectangular waveguide port is connected with the second bent waveguide.

8. The waveguide orthomode transducer of claim 7, wherein: the long side of the first rectangular waveguide port is parallel to the long side of the second rectangular waveguide port, or the long side of the first rectangular waveguide port is parallel to the long side of the third rectangular waveguide port.

9. The waveguide orthomode transducer of any of claims 1-8, wherein: the waveguide orthomode transducer is a metal shell with an inner cavity, and the inner cavity is smoothly arranged.

10. The waveguide orthomode transducer of claim 9, wherein: the metal shell is provided with a process hole or a process groove.

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