CN107508015B - Circular Waveguide Mode Converter - Google Patents
Circular Waveguide Mode Converter Download PDFInfo
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- CN107508015B CN107508015B CN201710670280.0A CN201710670280A CN107508015B CN 107508015 B CN107508015 B CN 107508015B CN 201710670280 A CN201710670280 A CN 201710670280A CN 107508015 B CN107508015 B CN 107508015B
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01P—WAVEGUIDES; RESONATORS, LINES, OR OTHER DEVICES OF THE WAVEGUIDE TYPE
- H01P1/00—Auxiliary devices
- H01P1/16—Auxiliary devices for mode selection, e.g. mode suppression or mode promotion; for mode conversion
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Abstract
The present application relates to microwave mode converters. The application discloses a circular waveguide mode converter, which comprises a starting end circular waveguide and a terminal end circular waveguide which are positioned on the same axis and have the same diameter, wherein a conversion section waveguide with the same diameter is connected between the starting end circular waveguide and the terminal end circular waveguide; the transition section waveguide consists of a semicircular straight waveguide and a semicircular bent waveguide which have the same diameter; the semicircular straight waveguide is coaxial with the initial end circular waveguide and the tail end circular waveguide; the two ends of the semicircular straight waveguide and the semicircular bent waveguide are aligned and connected with the initial end circular waveguide and the terminal end circular waveguide, and the chord edges of the semicircular straight waveguide and the semicircular bent waveguide are on the same flat plate; the axis is located on the plate; the microwave transmission path in the semicircular bent waveguide is longer than that of the semicircular straight waveguide, so that the phase difference of microwaves transmitted through the semicircular straight waveguide and the semicircular bent waveguide is pi. The application has obvious power capacity advantage under the same condition, has more compact structure and can obviously reduce occupied space.
Description
Technical Field
The application relates to the technical field of microwave mode converters, in particular to a converter type with coaxial input and output ports, and in particular relates to a circular waveguide mode converter.
Background
The mode converter is one of common microwave system devices, and the transmission modes of microwaves in the guide waveguide are various, such as a TEM mode, a TE mode and a TM mode, and different transmission modes have different characteristics and work in accordance with specific environmental requirements. Many microwave sources in high power microwave systems produce circularly symmetric TEMs and TM0n (also known as TM 0n ) Modes such as a magnetic insulated wire oscillator (MILO), a virtual cathode oscillator (Vircator), and a Backward Wave Oscillator (BWO), etc. These axisymmetric modes result in hollow beams when radiated directly, the gain in the axial direction is low, which is detrimental to the effect of the beam on the target. In addition, some use the transport TM01 (also written as TM 01 ) Antennas that convert circular waveguides of modes into coaxial structures for feeding, such as radial line fed helical array antennas, require the conversion of circular waveguide TE11 (also denoted TE 11 ) The mode is converted to TM01 mode. This shows that the circular waveguide TE11-TM01 mode converter is a widely used deviceThe quality of the design will obviously affect the operation of the microwave system.
The converter of the two modes has various conversion methods, and the device generally focuses on matching, loss, conversion rate and the like in terms of indexes, and also has requirements on external structure, size and power capacity when limited by specific application conditions. The characteristics and conversion rules of the two modes have great influence on the structure of the converter, according to the classification of whether the input and output ports are coaxial or not, the mode coupling theory in the waveguide theory is in a bent waveguide form commonly under the non-coaxial classification, has strong guiding effect on the conversion design in the mode, has high power capacity due to the simple structure and the metal structure, has the defect of occupying a large amount of lateral space, cannot be compact, and ensures that the position of the output port is also determined by the position of the converter [ Shiwen Yang and Hongfu Li, "Optimization of novel high-power mil-wave TM01-TE11mode converters," in IEEE Transactions on Microwave Theory and Techniques, vol.45, no.4, pp.552-554, apr.1997 ], [ B.M.Lee, W.S.Lee, Y.J.Yoon and J.H.so ], [ X-band TM01-TE11mode converter with short length for high power ], in Electronic Letters, vol.40, no.18, pp.1126-1127,2Sept.2004 ].
The coaxial classification is to convert the circular waveguide into another type of waveguide for reprocessing, for example, dividing into two symmetrical semicircular regions, and changing the propagation constant of one of them. Wang Dong et al divide the coaxial switching region into two regions in the circular waveguide, change the output phase of one of the regions by 180 ° by using the photonic crystal structure, and synthesize the switching region into the circular waveguide to complete the switching of modes TE11-TM 01. Limited by the photonic crystal structure, the conversion rate bandwidth index and power capacity under this structure are not ideal. [ Wang Dong, xu Sha, cao Yanwei, qin Fen. Photonic crystal high power microwave mode converter design [ J ]. Physical journal, 2014, (01): 374-379.]
The use of dielectric fill to change the propagation constant is also a fundamental approach to microwave transmission, but this approach is generally limited to applications where there are low index requirements due to problems of microwave reflection at different dielectric constant interfaces, large dielectric losses, etc. The Chittora researches a method for placing a medium parallel to the axis direction of a waveguide, and the method also belongs to the technical field of dividing a circular waveguide into two semicircular waveguides and changing the propagation constant of one of the semicircular waveguides, so that the problem of changing the propagation constant of some used mediums is solved to a certain extent, but the bandwidth and the breakdown threshold are smaller. [ A.Chittora, S.Singh, A.Sharma and J.Mukherjee, "A.novel. TM. 01to TE11Mode Converter Designed With Radially Loaded Dielectric Slabs," in IEEE Transactions on Microwave Theory and Techniques, vol.64, no.4, pp.1170-1175, april2016 ]
Yuan Chengwei describes a very short axial length conversion method, converting a circular waveguide into a double-layer asymmetric radial waveguide, controlling the phase of each path according to the transmission path on each side. Because the converter belongs to an all-metal structure, has a good high-power capacity design basis, and only the radial line conversion belongs to a strong structural mutation and is limited by a too narrow transmission channel, the final power capacity is not ideal, and the converter is not suitable for certain occasions which cannot occupy transverse space greatly. [ Yuan Chengwei, zhong Huihuang, zhangde, qian Baoliang. Compact circular polarization mode converter [ J ]. Intense laser and particle beam, 2009, (03): 411-415 ]
The method used by Eisenhart is to introduce coaxial transition, control the caliber of transmission in the conversion process, connect the inner conductor with the rectangular waveguide wall and then disappear, then the electric field perpendicular to the inner conductor gradually changes into the electric field perpendicular to the rectangular waveguide, namely TE10 mode, and finally transition the rectangular waveguide into a circular waveguide to obtain the mode conversion, wherein the conversion process is TM01-TEM-TE10-TE11, and the corresponding waveguide is the circular waveguide-coaxial waveguide-rectangular waveguide-circular waveguide. Although of all-metal construction, the power capacity presents a metal gap at the location of the coaxial waveguide transition, and the field strength increases to limit the power capacity. [ R.L.Eisenhart, "A novel wideband TM-to-TE 11mode converter,"1998IEEE MTT-S International Microwave Symposium Digest (Cat. No. 98CH36192), baltimore, MD, USA,1998, pp.249-252vol.1 ]
Therefore, the non-coaxial circular waveguide TE11-TM01 mode converter occupies a large space, which is not beneficial to miniaturization of products; the coaxial mode converter has a large difference between the power capacity index and the power capacity index due to implementation problems.
Disclosure of Invention
The application aims to provide a circular waveguide TE11-TM01 mode converter with coaxial input and output ports, which improves the power capacity and the bandwidth of the mode converter and reduces the loss.
In order to achieve the above object, according to an aspect of the present application, there is provided a circular waveguide mode converter, including an initial circular waveguide and a final circular waveguide having equal diameters on the same axis, between which transition section waveguides having the same diameters are connected; the method is characterized in that: the transition section waveguide consists of a semicircular straight waveguide and a semicircular bent waveguide which have the same diameter; the semicircular straight waveguide is coaxial with the initial end circular waveguide and the tail end circular waveguide; the two ends of the semicircular straight waveguide and the semicircular bent waveguide are aligned and connected with the initial end circular waveguide and the terminal end circular waveguide, and the chord edges of the semicircular straight waveguide and the semicircular bent waveguide are on the same flat plate; the axis is located on the plate; the microwave transmission path in the semicircular bent waveguide is longer than that of the semicircular straight waveguide, so that the phase difference of microwaves transmitted through the semicircular straight waveguide and the semicircular bent waveguide is pi.
Further: the slab length is less than the length of the semicircular straight waveguide.
Further: the end circular waveguide is provided with a pin, and the pin is positioned on the axis and penetrates through the end circular waveguide.
Further: the pin is perpendicular to the plate.
Further: the circular waveguide converter is arranged in a protective shell.
Further: the protective housing links to each other with the flat board.
Further: the circular waveguide converter is composed of a metal piece.
Further: the cavity of the circular waveguide converter is filled with vacuum or air medium.
Further: the circular waveguide converter is a TE11-TM01 mode converter or a TM01-TE11mode converter.
Specific: the semicircular bent waveguide comprises a first bent section, a second bent section, a straight section, a third bent section and a fourth bent section; the first bending section is connected with the initial end circular waveguide and bends theta 1 And then is connected with a second bending section which bends theta in the opposite direction 2 The rear end of the first bending section is connected with a straight section, the straight section is connected with a third bending section, the third bending section is connected with a fourth bending section, and the fourth bending section is connected with a tail end circular waveguide; the second bending section and the third bending section are the same in shape and opposite in placement direction; the first bending section and the fourth bending section are identical in shape and opposite in placement direction; wherein 0 < θ 1 ＜π，0＜θ 2 ＜π。
The beneficial effects of the application are as follows: for a TE11-TM01 mode converter with coaxial input and output ports, the application has obvious power capacity advantage under the same condition. Aiming at the similar converters with non-coaxial input and output ports, the application has more compact structure and can obviously reduce the occupied space. Furthermore, the pin is added to positively match the whole adjusting device, so that the bandwidth and the conversion rate are improved; the all-metal component design reduces losses.
Drawings
The accompanying drawings, which are included to provide a further understanding of the application, illustrate and explain the application, and together with the description serve to explain the specific embodiment of the application. In the drawings:
FIG. 1 is a schematic view of a circular waveguide structure;
FIG. 2 is a schematic diagram of a semicircular waveguide structure;
FIG. 3 is a schematic diagram of a circular waveguide mode converter according to embodiment 1;
FIG. 4 is a right side view of FIG. 3;
FIG. 5 is a rear view of FIG. 3;
FIG. 6 is a top view of FIG. 3;
FIG. 7 is a schematic view of the structural dimensions of example 2;
FIG. 8 is a right side view of FIG. 7;
FIG. 9 is a schematic diagram of the dimensions of the plate structure of example 2;
FIG. 10 is a right side view of FIG. 9;
FIG. 11 is a schematic diagram of the dimensions of the pin structure of example 2;
fig. 12 is a schematic diagram showing the transmission curve simulation results of the circular waveguide mode converter of embodiment 2.
Wherein:
4 is a flat plate;
5 is a pin;
7 is a protective shell;
10 is a starting end circular waveguide;
20 is a terminal circular waveguide;
30 is a transition segment waveguide;
31 is a semicircular straight waveguide;
32 is a semicircular curved waveguide;
100 is the arc edge of a semicircular waveguide;
200 is the chord edge of a semicircular waveguide;
321 is a first curved section;
322 is a second curved section;
323 is a straight section;
324 is a third curved segment;
325 is a fourth curved segment.
Detailed Description
It should be noted that, without conflict, the specific embodiments, examples and features thereof in the present disclosure may be combined with each other. The present application will now be described in detail with reference to the accompanying drawings in conjunction with the following.
In order that those skilled in the art will better understand the present application, a detailed description and a complete description of the technical solutions of the embodiments and examples of the present application will be provided below with reference to the accompanying drawings in the embodiments and examples, and it is apparent that the described examples are only some examples of the present application and not all examples. All other embodiments, examples, and implementations of what is known to those of ordinary skill in the art as being without undue burden are intended to be within the scope of the present application.
The waveguide is a microwave transmission line, most commonly in the form of a metal tube, of generally regular geometric shape in cross-section, such as circular, rectangular, etc. The application relates to two waveguides: circular waveguides and semicircular waveguides, the structure of which is shown in fig. 1 and 2. The cross-sectional shape of the circular waveguide is circular, see fig. 1. The semicircular waveguide has a semicircular cross section and is formed by connecting the arc edge 100 and the two ends of the chord edge 200, as shown in fig. 2. Circular and semicircular waveguides are typically made of conductive materials, such as metallic materials (aluminum, copper, steel, etc.). According to the characteristics of microwave transmission, the characteristics of the circular waveguide and the semicircular waveguide are mainly determined by the diameter of the circular waveguide and the semicircular waveguide, and the length of the circular waveguide is representative of the distance of microwave transmission regardless of the thickness of the material. In addition to linear waveguides, there are various curved shaped waveguides, called straight and curved waveguides, respectively. The bending angle, the turning radius, the bending shape and the like of the bent waveguide can change parameters such as microwave transmission direction, path and the like, so that the microwave propagation constant is changed, and therefore, various functional components such as delay lines, couplers, oscillators and the like can be designed.
The TE11mode microwaves and TM01 mode microwaves transmitted in the waveguide are sometimes also referred to herein as TE11 waves and TM01 waves.
Example 1
The circular waveguide mode converter of this example is shown in block diagrams 3, 4, 5 and 6. When the TE11 wave enters the transducer from the start circular waveguide 10, the end circular waveguide exits the TM01 wave. Conversely, when the TM01 wave enters the transducer from the end circular waveguide 20, the TE11 wave exits from the beginning circular waveguide 10. That is, the circular waveguide converter can be a TE11-TM01 mode converter or a TM01-TE11mode converter, and can complete the mutual conversion of TM01 and TE 11.
The circular waveguide mode converter structure of the embodiment comprises a start circular waveguide 10 and a tail circular waveguide 20 which are positioned on the same axis and have the same diameter, and a conversion section waveguide 30 which is connected between the start circular waveguide and the tail circular waveguide and has the same diameter. See fig. 3, 5 and 6, wherein the portion between line segments i and j is the transition segment waveguide 30.
The transition piece waveguide 30 of this example is composed of a semicircular straight waveguide 31 and a semicircular curved waveguide 32 having the same diameter side by side as shown in fig. 4. The semicircular straight waveguide 31 is coaxial with the start circular waveguide 10 and the end circular waveguide 20, as shown by OP in fig. 5 and 6. The semicircular straight waveguide 31 and the semicircular bent waveguide 32 are aligned at both ends and connect the start circular waveguide 10 and the end circular waveguide 20, and the connection points are i and j in fig. 3, 5 and 6. The chord edges of the semicircular straight waveguide 31 and the semicircular curved waveguide 32 are on the flat plate 4, see fig. 4. The common axis OP of the semicircular straight waveguide 31, the start circular waveguide 10, and the end circular waveguide 20 is located on the flat plate 4 as shown in fig. 5 and 6. Since the microwave transmission path in the semicircular bent waveguide 32 is meandering, the microwave transmission path is longer than the semicircular straight waveguide 31, so that the phase difference of microwaves transmitted through the semicircular straight waveguide 31 and the semicircular bent waveguide 32 is pi.
As shown in fig. 3, the semicircular bent waveguide 32 of this example is serpentine in S shape, and is divided into five segments by dotted lines in fig. 3: first curved section 321, second curved section 322, straight section 323, third curved section 324, and fourth curved section 325.
In this example, the first curved section 321 of the semicircular curved waveguide 32 is connected to the initial circular waveguide 10, and the dashed line i in fig. 3 is the interface position, and as can be seen in fig. 5, the interface position of the semicircular straight waveguide 31 and the initial circular waveguide 10 is also at the dashed line i. As shown in fig. 3, the first curved section 321 is curved upward by θ 1 And then is connected to second bending section 322, second bending section 322 is bent downward by θ 2 And then connected with the straight section 323, the straight section 323 is connected with the third bending section 324, and the third bending section 324 bends upward by θ 2 And then connected with the fourth bending section 325, the fourth bending section 325 bends downward by θ 1 And then connects with the end circular waveguide 20 at the dashed line j. Likewise, the connection position of the semicircular straight waveguide 31 and the end circular waveguide 20 is also at the broken line j, as shown in fig. 5. As can be seen from fig. 3, in the semicircular curved waveguide 32 of this embodiment, the first curved section 321 has the same shape as the fourth curved section 325, and is placed in opposite directions, and the second curved section 322 has the same shape as the third curved section 324, and is placed in opposite directions. Bending angle θ in this example 1 And theta 2 The range is as follows: 0 < theta 1 ＜π，0＜θ 2 < pi, and 2 theta 1 ＝θ 2 . The first curved section 321, the second curved section 322, the third curved section 324, and the fourth curved section 325 of this example have the same turning radius.
The semicircular bent waveguide of the converter has the bent shape and structure, which is beneficial to reducing the volume of the converter and improving the space utilization rate. The converter of the example can adjust the bending angle theta 1 And theta 2 The microwave phase can be conveniently controlled by taking the value and turning radius, and the microwave phase difference transmitted by the semicircular straight waveguide 31 and the semicircular bent waveguide 32 is ensured to be pi. As can be seen from fig. 3, 4, 5 and 6, the structure of the mode converter of the present embodiment has many identical structural parameters, such as turning radius and shape, so that the complexity of the mold is greatly reduced, which is very beneficial to reducing the production cost and ensuring the processing angle. The tortuous S-shaped bending shape greatly reduces the space occupied by the mode converter, and the product structure is more compact and small.
As can be seen from fig. 6, the length of the slab 4 is smaller than the length of the semicircular straight waveguide 31, that is, the slab 4 in the transition section waveguide 30 does not contact the start circular waveguide 10 and the end circular waveguide 20, with a distance d3 therebetween. The distance d3 is very small, but there is a small transition when the microwaves enter the transition waveguide 30 and split into two paths, and the microwaves leave the transition waveguide 30 to combine into one path. The influence of the end part of the flat plate 4 on microwave transmission is reduced, and the microwave reflection and transmission loss are reduced.
In order to improve the bandwidth and the conversion rate and also facilitate the overall matching of the converter, the pin 5 is arranged on the end circular waveguide 20 in the embodiment, the pin 5 is positioned on the axis OP and penetrates through the end circular waveguide 20, and the pin 5 is perpendicular to the flat plate 4. This configuration can significantly improve the pin insertion and improve the matching effect, as shown in fig. 3 and 5.
The transducer of this example can be very conveniently tuned to achieve better performance by adjusting the diameter of the pin 5 and the distance from the transition section 30.
According to the converter, the circular waveguide is divided into two semicircular waveguides according to the characteristic that the propagation constant is required to be changed in the conversion of two microwave modes, one semicircular waveguide is processed, and the phase of the circular waveguide is artificially delayed. All metal parts are used in the design, and the smooth and compact structural change is required to improve the performance and meet the wide application demands.
The working principle of the converter is as follows: after the initial end circular waveguide inputs the TE11mode, in the transition section waveguide 30, the flat plate 4 averagely divides the circular waveguide into two semicircular waveguides, namely a semicircular straight waveguide 31 and a semicircular bent waveguide 32. The microwave transmission direction in the semicircular straight waveguide 31 is unchanged, and the semicircular bent waveguide 32 meanders forward to be S-shaped. Based on the symmetrical design, the end pointing axis of the semicircular curved waveguide 32 coincides with the beginning circular waveguide axis. In this process, the semicircular bent waveguide 32 extends a longer distance than the semicircular straight waveguide 31 when reaching the end circular waveguide, and the phase difference can be adjusted by adjusting the structural parameters of the semicircular bent waveguide, so that when the phase difference is 180 °, mode conversion is realized. Finally, the two semicircular waveguides are recombined into a circular waveguide, the end circular waveguide 20. Since pins are added in a direction perpendicular to the plate 4, the axis OP, it can be used to adjust the fit. The mode converter is reversible, so that TE11mode microwaves can be obtained by reversely inputting TM01 mode microwaves, and mutual conversion of the TM01 mode microwaves and the TE11mode microwaves is realized.
Example 2
Referring to fig. 7-11, the converter of the present embodiment is placed in the protective shell 7, which is beneficial to improving the structural strength of the converter and is also convenient for processing and manufacturing. The shape of the protective case is not required by the present application, and the protective case shown in the drawings has a rectangular structure, which is merely an example for easy processing. For convenience of processing, the protective shell 7 of this example is composed of two shells with the same structural shape, as shown in fig. 8.
The operating frequency of the present example converter is 12.67GHz, and the dimensions noted in fig. 7-11 are shown in table 1, where: θ 1 A bending angle is set for the first bending section; θ 2 Bending the second bending section by a bending angle; θ 3 A bending angle is set for the third bending section; θ 4 Bending angle of the fourth bending section；d 1 Is straight section length; d, d 2 Distance between the pin and the conversion section; d, d 3 The distance between the initial end circular waveguide or the final end circular waveguide and the flat plate is set; d, d 4 Is the width of the flat plate; d, d 5 Is the length of the flat plate; d, d 6 Is the pin length, i.e., the diameter of the end circular waveguide; d (D) 1 Is the diameter of the pin; r is R 1 The outer arc radius of each bending section of the semicircular bending waveguide; r is R 2 The inner arc radius of each bending section of the semicircular bending waveguide; r is R 3 The radius of the initial end circular waveguide is also the radius of the end circular waveguide, the radius of the semicircular straight waveguide and the radius of the semicircular bent waveguide of the example; t is the plate thickness.
The width of the plate 4 extends to be connected with the protective shell, so that the stability of the converter can be further enhanced.
The round waveguide converter of this example is entirely composed of metal pieces.
The cavity of the circular waveguide converter is vacuum (without medium filling), so that the microwave transmission loss can be further reduced.
The dielectric-free converter with the all-metal structure is beneficial to reducing loss and cost and reducing the complexity of the converter structure.
Other structures of the present example converter are described in example 1.
The simulation result of the S parameter corresponding to the converter of this example is shown in fig. 12, which shows that:
in the frequency band from 12.1GHz to 13.5GHz, the conversion efficiency of the converter exceeds 95%, and the relative bandwidth under the index reaches 11%. At the designed operating frequency of 12.67GHz, the mode conversion rate was 99.3%. Simulation results of the field strength distribution of the present example converter show that the microwave phase in the curved semicircular waveguide 32 located in the upper half is retarded by 180 ° before and after the conversion section 30. The maximum field strength is 3776V/m, assuming an input power of 0.5W, and using the breakdown threshold in air, the power capacity P is calculated as:
TABLE 1
| Parameters (parameters) | θ 1 | θ 2 | θ 3 | θ 4 | d 1 | d 2 | d 3 | d 4 |
| Value of | 50° | 100° | 100° | 50° | 14.9mm | 6.5mm | 1.57mm | 48.5mm |
| Parameters (parameters) | d 5 | d 6 | D 1 | R 1 | R 2 | R 3 | t | |
| Value of | 80mm | 21.6mm | 2mm | 26.8mm | 5.2mm | 10.8mm | 1.4mm |
According to the analog-to-digital converter, the microwave phase difference transmitted by the semicircular straight waveguide and the semicircular bent waveguide can be pi by reasonably selecting the numbers of the size parameters in the table 1 according to different working frequencies, so that the design requirement of the mode converter is met. It goes without saying that other curved shapes can be adopted to enable the phase difference of microwaves transmitted by the semicircular straight waveguide and the semicircular curved waveguide to be pi.
Claims (9)
1. The circular waveguide mode converter comprises a start circular waveguide and a tail circular waveguide which are positioned on the same axis and have the same diameter, and a conversion section waveguide with the same diameter is connected between the start circular waveguide and the tail circular waveguide; the method is characterized in that: the transition section waveguide consists of a semicircular straight waveguide and a semicircular bent waveguide which have the same diameter; the semicircular straight waveguide is coaxial with the initial end circular waveguide and the tail end circular waveguide; the two ends of the semicircular straight waveguide and the semicircular bent waveguide are aligned and connected with the initial end circular waveguide and the terminal end circular waveguide, and the chord edges of the semicircular straight waveguide and the semicircular bent waveguide are on the same flat plate; the axis is located on the plate; the microwave transmission path in the semicircular bent waveguide is longer than that of the semicircular straight waveguide, so that the phase difference of microwaves transmitted through the semicircular straight waveguide and the semicircular bent waveguide is pi;
the semicircular bent waveguide comprises a first bent section, a second bent section, a straight section, a third bent section and a fourth bent section; the first bending section is connected with the initial end circular waveguide and bends theta 1 And then is connected with a second bending section which bends theta in the opposite direction 2 The rear end of the first bending section is connected with a straight section, the straight section is connected with a third bending section, the third bending section is connected with a fourth bending section, and the fourth bending section is connected with a tail end circular waveguide; the second bending section and the third bending section are the same in shape and opposite in placement direction; the first bending section and the fourth bending section are identical in shape and opposite in placement direction; wherein 0 < θ 1 ＜π，0＜θ 2 ＜π。
2. The circular waveguide mode converter according to claim 1, wherein: the slab length is less than the length of the semicircular straight waveguide.
3. The circular waveguide mode converter according to claim 1, wherein: the end circular waveguide is provided with a pin, and the pin is positioned on the axis and penetrates through the end circular waveguide.
4. A circular waveguide mode converter according to claim 3, wherein: the pin is perpendicular to the plate.
5. The circular waveguide mode converter according to claim 1, wherein: the circular waveguide mode converter is disposed in a protective housing.
6. The circular waveguide mode converter according to claim 5, wherein: the protective housing links to each other with the flat board.
7. The circular waveguide mode converter according to claim 1, wherein: the circular waveguide mode converter is composed of a metal piece.
8. The circular waveguide mode converter according to claim 7, wherein: the cavity of the circular waveguide mode converter is filled with vacuum or air medium.
9. The circular waveguide mode converter according to claim 1, wherein: the circular waveguide mode converter is a TE11-TM01 mode converter or a TM01-TE11mode converter.
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| CN112259940B (en) * | 2020-09-21 | 2021-12-24 | 西北核技术研究所 | Tunable mixed mode converter based on over-mode circular waveguide and design method thereof |
| CN115939932B (en) * | 2023-02-17 | 2023-05-09 | 福建慧芯激光科技有限公司 | High Shan Moliang-rate bent waveguide DFB laser chip |
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