阅读说明：本技术 一种圆波导与矩形波导的径向过渡转换结构 (Radial transition conversion structure of circular waveguide and rectangular waveguide ) 是由 王宸星 刘凯 于 2019-11-04 设计创作，主要内容包括：本发明公开了一种圆波导与矩形波导的径向过渡转换结构,包括圆波导与径向波导过渡体、径向波导与矩形波导过渡体；圆波导与径向波导过渡体包括在圆波导的端壁设置有匹配圆台,匹配圆台的圆心与圆波导的横截面的圆心重合,并且匹配圆台的半径小于圆波导的横截面的半径,在圆波导的圆弧侧壁面径向向外延伸出第一过渡波导；径向波导与矩形波导过渡体包括与第一过渡波导的出口连接、径向延伸且开口宽度渐宽的第二过渡波导,第二过渡波导的出口连接输出矩形波导。本发明通过圆波导与矩形波导的径向过渡结构实现了圆波导TE01模式与矩形波导TE10模式之间的相互转换,具有结构统一,幅度相位一致性好、低损耗、输出端口之间隔离度大的特点。(The invention discloses a radial transition conversion structure of a circular waveguide and a rectangular waveguide, which comprises a circular waveguide and radial waveguide transition body, a radial waveguide and a rectangular waveguide transition body; the circular waveguide and radial waveguide transition body comprises a matching circular truncated cone arranged on the end wall of the circular waveguide, the circle center of the matching circular truncated cone is overlapped with the circle center of the cross section of the circular waveguide, the radius of the matching circular truncated cone is smaller than that of the cross section of the circular waveguide, and a first transition waveguide extends out of the circular arc side wall surface of the circular waveguide in the radial direction; the radial waveguide and rectangular waveguide transition body comprises a second transition waveguide which is connected with the outlet of the first transition waveguide, extends radially and has a gradually widened opening width, and the outlet of the second transition waveguide is connected with the output rectangular waveguide. The invention realizes the mutual conversion between the TE01 mode of the circular waveguide and the TE10 mode of the rectangular waveguide through the radial transition structure of the circular waveguide and the rectangular waveguide, and has the characteristics of uniform structure, good amplitude phase consistency, low loss and high isolation between output ports.)

1. A radial transition conversion structure of a circular waveguide and a rectangular waveguide is characterized by comprising a circular waveguide and radial waveguide transition body, a radial waveguide and rectangular waveguide transition body; the circular waveguide and radial waveguide transition body comprises a matching circular truncated cone arranged on the end wall of the circular waveguide, the circle center of the matching circular truncated cone is overlapped with the circle center of the cross section of the circular waveguide, the radius of the matching circular truncated cone is smaller than that of the cross section of the circular waveguide, and a first transition waveguide extends outwards in the radial direction from the circular arc side wall surface of the circular waveguide; the radial waveguide and rectangular waveguide transition body comprises a second transition waveguide which is connected with an outlet of the first transition waveguide, extends radially and has a gradually widened opening width, and an outlet of the second transition waveguide is connected with the output rectangular waveguide.

2. The radial transition structure of the circular waveguide and the rectangular waveguide as claimed in claim 1, wherein the radial transition structure of the circular waveguide and the rectangular waveguide has 2N number of radial transition structures, N is greater than or equal to 1, and a space is left between the radial transition structures of the circular waveguide and the rectangular waveguide.

3. The radial transition structure of a circular waveguide and a rectangular waveguide as claimed in claim 2, wherein the width W of the first transition waveguide₁Radius R of the circular waveguide₁Satisfies the relation W₁＝2R₁sin (theta/2), where theta is the arc angle of the first transition waveguide corresponding to the circular waveguide, and theta < 180 DEG/N is satisfied.

4. The radial transition structure of a circular waveguide and a rectangular waveguide as claimed in claim 3, wherein a thin film resistor is loaded at the entrance of the first transition waveguide.

5. The radial transition structure of a circular waveguide and a rectangular waveguide according to claim 4, wherein the thin film resistor is made of resistive material TaN coated on a ceramic dielectric plate, the thickness of the ceramic dielectric plate is 0.127mm, and the resistive material TaN is in a strip shape.

6. The radial transition structure of a circular waveguide and a rectangular waveguide as claimed in claim 3 or 4, wherein N-4, and the radius R of the circular waveguide₁3.74mm, width W of the first transition waveguide₁0.94mm, length 2.52 mm; width W of second transition waveguide₂1.88mm and 12mm in length.

7. The radial transition structure of a circular waveguide and a rectangular waveguide as claimed in claim 3 or 4, wherein N-8, and the radius R of the circular waveguide₁3.74mm, width W of the first transition waveguide₁0.94mm, length 2.52 mm; width W of second transition waveguide₂1.88mm and 12mm in length.

Technical Field

The invention relates to the field of millimeter wave communication, in particular to a radial transition conversion structure of a circular waveguide and a rectangular waveguide.

Background

When a circular waveguide is guided to a plurality of rectangular waveguides for conversion, it is necessary to consider that an electromagnetic wave signal can be uniformly distributed from the circular waveguide to each rectangular waveguide, and a good transition characteristic is required in the conversion process from the circular waveguide to the plurality of rectangular waveguides, so that good return loss characteristics, isolation characteristics and the like can be ensured when the electromagnetic wave propagates in a conversion body, which needs to be optimally designed.

Disclosure of Invention

The invention mainly solves the technical problem of providing a radial transition conversion structure of a circular waveguide and a rectangular waveguide, and solves the problems of inconsistent amplitude and phase, high loss and low isolation of output ports of all branches of a radial waveguide power divider in the prior art.

In order to solve the technical problem, one technical scheme adopted by the invention is to provide a radial transition conversion structure of a circular waveguide and a rectangular waveguide, which comprises a circular waveguide and radial waveguide transition body, a radial waveguide and rectangular waveguide transition body; the circular waveguide and radial waveguide transition body comprises a matching circular truncated cone arranged on the end wall of the circular waveguide, the circle center of the matching circular truncated cone is overlapped with the circle center of the cross section of the circular waveguide, the radius of the matching circular truncated cone is smaller than that of the cross section of the circular waveguide, and a first transition waveguide extends outwards in the radial direction from the circular arc side wall surface of the circular waveguide; the radial waveguide and rectangular waveguide transition body comprises a second transition waveguide which is connected with an outlet of the first transition waveguide, extends radially and has a gradually widened opening width, and an outlet of the second transition waveguide is connected with the output rectangular waveguide.

Preferably, 2N radial transition conversion structures of the circular waveguide and the rectangular waveguide are uniformly distributed along the circumferential direction of the circular waveguide, N is larger than or equal to 1, and a space is reserved between the adjacent radial transition conversion structures of the circular waveguide and the rectangular waveguide.

Preferably, the width W of the first transition waveguide₁Radius R of the circular waveguide₁Satisfies the relation W₁＝2R₁sin (theta/2), where theta is the arc angle of the first transition waveguide corresponding to the circular waveguide, and theta < 180 DEG/N is satisfied.

Preferably, a thin film resistor is loaded at the entrance of the first transition waveguide.

Preferably, the thin film resistor is formed by coating a resistive material TaN on a ceramic dielectric plate, the thickness of the ceramic dielectric plate is 0.127mm, and the resistive material TaN is in a long strip shape.

Preferably, N is 4, soRadius R of the circular waveguide₁3.74mm, width W of the first transition waveguide₁0.94mm, length 2.52 mm; width W of second transition waveguide₂1.88mm and 12mm in length.

Preferably, N is 8, and the radius R of the circular waveguide is₁3.74mm, width W of the first transition waveguide₁0.94mm, length 2.52 mm; the width W2 of the second transition waveguide is 1.88mm, and the length is 12 mm.

The invention has the beneficial effects that: the invention discloses a radial transition conversion structure of a circular waveguide and a rectangular waveguide, which comprises a circular waveguide and radial waveguide transition body, a radial waveguide and a rectangular waveguide transition body; the circular waveguide and radial waveguide transition body comprises a matching circular truncated cone arranged on the end wall of the circular waveguide, the circle center of the matching circular truncated cone is overlapped with the circle center of the cross section of the circular waveguide, the radius of the matching circular truncated cone is smaller than that of the cross section of the circular waveguide, and a first transition waveguide extends out of the circular arc side wall surface of the circular waveguide in the radial direction; the radial waveguide and rectangular waveguide transition body comprises a second transition waveguide which is connected with the outlet of the first transition waveguide, extends radially and has a gradually widened opening width, and the outlet of the second transition waveguide is connected with the output rectangular waveguide. The invention realizes the mutual conversion between the TE01 mode of the circular waveguide and the TE10 mode of the rectangular waveguide through the radial transition structure of the circular waveguide and the rectangular waveguide, and has the characteristics of uniform structure, good amplitude phase consistency, low loss and high isolation between output ports.

Drawings

FIG. 1 is a schematic structural diagram of an embodiment of a radial transition structure of a circular waveguide and a rectangular waveguide according to the present invention;

FIG. 2 is a schematic view of a transition body between a circular waveguide and a radial waveguide in another embodiment of a radial transition structure between a circular waveguide and a rectangular waveguide according to the present invention;

FIG. 3 is a schematic structural diagram of a radial waveguide and rectangular waveguide transition body in another embodiment of a radial transition structure of a circular waveguide and a rectangular waveguide according to the present invention;

FIG. 4 is a block diagram of another embodiment of a radial transition structure of a circular waveguide and a rectangular waveguide in accordance with the present invention;

FIG. 5 is a block diagram of another embodiment of a radial transition structure of a circular waveguide and a rectangular waveguide in accordance with the present invention;

FIG. 6 is a simulated view of another embodiment of a radial transition structure of a circular waveguide and a rectangular waveguide in accordance with the present invention;

FIG. 7 is a schematic diagram of a dielectric plate and a thin film resistor in another embodiment of a radial transition structure of a circular waveguide and a rectangular waveguide according to the present invention;

FIG. 8 is a structural diagram of a thin film resistor in another embodiment of a radial transition structure of a circular waveguide and a rectangular waveguide according to the present invention;

FIG. 9 is a simulation diagram of a radial transition structure of a circular waveguide and a rectangular waveguide after adding a thin film resistor according to another embodiment of the present invention;

FIG. 10 is a block diagram of another embodiment of a radial transition structure of a circular waveguide and a rectangular waveguide in accordance with the present invention;

FIG. 11 is a simulated view of another embodiment of a radial transition structure of a circular waveguide and a rectangular waveguide in accordance with the present invention;

FIG. 12 is a simulation diagram of S-parameters in another embodiment of a radial transition structure of a circular waveguide and a rectangular waveguide according to the present invention;

FIG. 13 is a phase simulation diagram in another embodiment of a radial transition structure of a circular waveguide and a rectangular waveguide according to the present invention;

fig. 14 is a simulation diagram of another embodiment of a radial transition structure of a circular waveguide and a rectangular waveguide according to the present invention.

Detailed Description

In order to facilitate an understanding of the invention, the invention is described in more detail below with reference to the accompanying drawings and specific examples. Preferred embodiments of the present invention are shown in the drawings. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.

It is to be noted that, unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.

As shown in fig. 1 to 3, the radial transition structure 1 of a circular waveguide and a rectangular waveguide includes a circular waveguide and radial waveguide transition body 101 and a radial waveguide and rectangular waveguide transition body 102. The circular waveguide and radial waveguide transition 101 comprises a matching circular truncated cone 201 arranged on the end wall of the circular waveguide 2, and the matching circular truncated cone 201 is used for realizing mode conversion; the circle center of the matching circular truncated cone 201 is superposed with the circle center of the cross section of the circular waveguide 2, the radius of the matching circular truncated cone 201 is smaller than that of the cross section of the circular waveguide 2, and a first transition waveguide 3 extends outwards in the radial direction from the circular arc side wall surface of the circular waveguide 2.

The radial waveguide and rectangular waveguide transition body 102 comprises a second transition waveguide 4 which is connected with the outlet of the first transition waveguide 3, extends radially and has a gradually widened opening width, and the outlet of the second transition waveguide 4 is connected with an output rectangular waveguide 5.

When the circular waveguide 2 is used as an input port, a TE01 mode of the circular waveguide 2 is excited, the TE01 mode is output to the rectangular waveguide 5 through a radial transition conversion structure of the circular waveguide and the rectangular waveguide, at the moment, the mode output by the rectangular waveguide 5 is a TE10 mode of a rectangular waveguide main mode, and as longitudinal current does not exist on a waveguide wall of the circular waveguide TE01 mode, only surface current in the circumferential direction exists, and the conductor loss is small. Similarly, the radial transition conversion structure of the circular waveguide and the rectangular waveguide can also use the rectangular waveguide 5 as an input port and the circular waveguide 2 as an output port.

Preferably, 2N radial transition conversion structures 1 of the circular waveguide and the rectangular waveguide are uniformly distributed along the circumferential direction of the circular waveguide 2, N is larger than or equal to 1, and a space is reserved between the adjacent radial transition conversion structures of the circular waveguide and the rectangular waveguide.

In FIG. 4, the first transition waveguide 3 (minus height waveguide) degree W₁Radius R of circular waveguide₁Satisfies the relation W₁＝2R₁sin (theta/2), where theta is the arc angle of the first transition waveguide 3 corresponding to the circular waveguide 2, and satisfies theta < 180 deg./N. Width W of exit of second transition waveguide 4₂Equal to the width of the narrow side of the rectangular waveguide 5.

In an embodiment of the present invention, N is 4, and in conjunction with fig. 5, the radius R of the circular waveguide 2₁3.74mm, the radius r of the matching circular truncated cone 201 is 1.6, and the height h is 1.3 mm; width W of the first transition waveguide 3₁The radial length L1 of the first transition waveguide 3 is 2.52mm, 0.94 mm. The width of the input port of the second transition waveguide 4 (the height-reducing waveguide and the full-height waveguide transition waveguide) is equal to that of the first transition waveguide 3, and the size of the input port is 0.94 mm; width W of output port of second transition waveguide 4₂Equal to the width of the narrow side of the rectangular waveguide 5, i.e. W₂1.88 mm; the radial length L2 of the second transition waveguide 4 is 15 mm; the lengths of the long sides of the first transition waveguide 3 and the second transition waveguide 4 are both 3.759mm, which is the same as the length of the long side of the rectangular waveguide to be output, and the radial length L3 of the rectangular waveguide 5 is 12 mm.

As shown in fig. 6, the radial transition structure of one of the circular waveguides and the rectangular waveguide of this embodiment is modeled, and only the TE01 mode exists in the circular waveguide by default. It can be seen that the return loss is substantially lower than-20 dB over the 53-75GHz range and substantially below-15 dB over the entire V-band range (50-75 GHz).

As shown in fig. 7, on the basis of this embodiment, in order to improve the isolation of the output port of the rectangular waveguide, a thin film resistor 7 is loaded in the middle of the inlet of the first transition waveguide 3, and the thin film resistor 7 is made of a dissipative resistive material TaN coated on both sides of a ceramic dielectric sheet 8.

As shown in fig. 8, the ceramic dielectric plate 8 has a length of 3.76mm, a width of 1.20mm and a thickness of 0.25 mm; the thin film resistor 7 is a strip-shaped resistor coated on the middle surface of the ceramic dielectric sheet, the transverse width of the thin film resistor 7 is 1.20mm, and the longitudinal length of the thin film resistor is 0.40 mm.

As shown in fig. 9, the isolation before and after loading the thin film resistor is simulated, and it can be seen that the isolation between the output ports of the adjacent rectangular waveguides is improved from 6dB to 18dB after loading the thin film resistor.

As shown in fig. 10, as another embodiment of the present invention, when N is 8, 16 radial transition structures 1 of a circular waveguide and a rectangular waveguide are distributed in the radial direction of a circular waveguide 2 with the circular waveguide as the center; the shape and size of the radial transition structure 1 of each circular waveguide and each rectangular waveguide are the same as those of the radial transition structure when N is 4.

As shown in fig. 11, it can be seen that the return loss of the radial transition structure of the 16-way circular waveguide and the rectangular waveguide is substantially below-20 dB, and the insertion loss is substantially less than 0.15dB in the whole V-band range.

After the radial transition structure of the 16 paths of circular waveguides and the rectangular waveguides is connected with the mode converter, the rectangular waveguides of the mode converter are used as input ports, and the rectangular waveguides of the radial transition structure of the 16 paths of circular waveguides and the rectangular waveguides are used as output ports to carry out simulation test.

In combination with fig. 12 to 14, it can be seen that in the range of 52GHz to 68GHz, the return loss of the radial transition structure of the 16-way circular waveguide and the rectangular waveguide is lower than-18 dB, in the range of 55GHz to 65GHz, dBS (1, 1) is basically lower than-20 dB, the insertion loss is within 12.4dB, the amplitude and phase consistency between the output branches is within ± 0.3dB, and the phase consistency is good. The physical structure of the radial transition structure of the 16-path circular waveguide and the rectangular waveguide has symmetry, so that the radial transition structure has the advantages of low loss and good amplitude phase consistency, and the isolation between the output branches can be increased by loading thin-film resistors between the output branches.

The invention has the beneficial effects that: the invention discloses a radial transition conversion structure of a circular waveguide and a rectangular waveguide, which comprises a circular waveguide and radial waveguide transition body, a radial waveguide and a rectangular waveguide transition body; the circular waveguide and radial waveguide transition body comprises a matching circular truncated cone arranged on the end wall of the circular waveguide, the circle center of the matching circular truncated cone is overlapped with the circle center of the cross section of the circular waveguide, the radius of the matching circular truncated cone is smaller than that of the cross section of the circular waveguide, and a first transition waveguide extends out of the circular arc side wall surface of the circular waveguide in the radial direction; the radial waveguide and rectangular waveguide transition body comprises a second transition waveguide which is connected with the outlet of the first transition waveguide, extends radially and has a gradually widened opening width, and the outlet of the second transition waveguide is connected with the output rectangular waveguide. The invention realizes the mutual conversion between the TE01 mode of the circular waveguide and the TE10 mode of the rectangular waveguide through the radial transition structure of the circular waveguide and the rectangular waveguide, and has the characteristics of uniform structure, good amplitude phase consistency, low loss and high isolation between output ports.

The above description is only an embodiment of the present invention, and not intended to limit the scope of the present invention, and all equivalent structural changes made by using the contents of the present specification and the drawings, or applied directly or indirectly to other related technical fields, are included in the scope of the present invention.