阅读说明：本技术 一种波导模式转换器 (Waveguide mode converter ) 是由 孙谦 王宸星 于 2019-11-04 设计创作，主要内容包括：本发明公开了一种波导模式转换器,包括依次串接在一起的三段转换体,其中第一转换体为T型渐变转换体,包括第一输入矩形波导接口和第一输出矩形波导接口,第一输入矩形波导接口的长边和第一输出矩形波导接口的长边相互垂直；第二转换体为十字型渐变转换体,包括第二输入矩形波导接口和第二输出十字型波导接口,第二输入矩形波导接口与第一输出矩形波导接口相适配；第三转换体为圆形渐变转换体,包括第三输入十字型波导接口和第三输出圆型波导接口,第三输入十字型波导接口与第二输出十字型波导接口相适配。本发明实现了整个V波段的频率上矩形波导TE<Sub>10</Sub>到圆波导TE<Sub>01</Sub>模式的高效转化。(The invention discloses a waveguide mode converter, which comprises three sections of conversion bodies which are sequentially connected in series, wherein the first conversion body is a T-shaped gradual change conversion body and comprises a first input rectangular waveguide interface and a first output rectangular waveguide interface, and the long side of the first input rectangular waveguide interface is vertical to the long side of the first output rectangular waveguide interface; the second conversion body is a cross-shaped gradual change conversion body and comprises a second input rectangular waveguide interface and a second output cross-shaped waveguide interface, and the second input rectangular waveguide interface is matched with the first output rectangular waveguide interface; the third conversion body is a circular gradient conversion body and comprises a third input cross waveguide interface and a third output circular waveguide interface, and the third input cross waveguide interface is matched with the second output cross waveguide interface. The invention realizes the TE rectangular waveguide on the frequency of the whole V wave band 10 To circular waveguide TE 01 Efficient conversion of the modes.)

1. A waveguide mode converter is characterized by comprising three sections of conversion bodies which are sequentially connected in series, wherein a first conversion body is a T-shaped gradual change conversion body and comprises a first input rectangular waveguide interface and a first output rectangular waveguide interface, and the long side of the first input rectangular waveguide interface is perpendicular to the long side of the first output rectangular waveguide interface; the second conversion body is a cross-shaped gradual change conversion body and comprises a second input rectangular waveguide interface and a second output cross-shaped waveguide interface, and the second input rectangular waveguide interface is matched with the first output rectangular waveguide interface; the third conversion body is a circular gradient conversion body and comprises a third input cross waveguide interface and a third output circular waveguide interface, and the third input cross waveguide interface is matched with the second output cross waveguide interface.

2. The waveguide mode converter of claim 1, wherein the upper half of the first input rectangular waveguide interface gradually decreases to the upper long side of the second output rectangular waveguide interface along the lower right direction, and the lower half of the first input rectangular waveguide interface gradually expands to the second output rectangular waveguide interface along the front-rear direction.

3. The waveguide mode converter of claim 2, wherein the first transition body has an overall length of 45mm, wherein the first input rectangular waveguide interface has a long side length of 3.759mm and a short side length of 1.88 mm; the length of the long side of the first output rectangular waveguide interface is 7.518mm, and the length of the short side of the first output rectangular waveguide interface is 1.88 mm.

4. The waveguide mode converter of claim 3, wherein the first transition body is a rectangular waveguide TE₁₀Mode conversion to rectangular waveguide TE₂₀Mode(s).

5. The waveguide mode converter of claim 2, wherein four end corners of the second input rectangular waveguide interface extend obliquely to the right and intersect to form the second output cross-shaped waveguide interface in a cross shape, wherein two end corners of a diagonal line of the second input rectangular waveguide interface form two ends of the second output cross-shaped waveguide interface on the same straight line.

6. The waveguide mode converter of claim 5, wherein the overall length of the second transition body is 22mm, the length of the long side of the second input rectangular waveguide interface is 7.518mm, and the length of the short side is 1.88 mm; the distance between the center of the second output cross-shaped waveguide interface and the short side of each end of the second output cross-shaped waveguide interface is 3.96 mm.

7. The waveguide mode converter of claim 6, wherein the second transition body is a rectangular waveguide TE₂₀Mode conversion into cross waveguide TE₂₂Mode(s).

8. The waveguide mode converter of claim 5, wherein the four ends of the third input cross waveguide interface have long sides that gradually extend to the right, short sides that gradually expand and form curved sides that eventually converge to form the third output circular waveguide interface.

9. The waveguide mode converter of claim 8, wherein the third transition body has a length of 40mm, and the distance between the center of the third input cross waveguide interface and the short side of each end of the third input cross waveguide interface is 3.96 mm; the radius of the third output circular waveguide interface is 3.74 mm.

10. The waveguide mode converter of claim 9, wherein the third transition body is a cross waveguide TE₂₂Mode conversion to circular waveguide TE₀₁Mode(s).

Technical Field

The invention relates to the technical field of millimeter wave communication, in particular to a waveguide mode converter.

Background

Rectangular waveguide TE₁₀Mode-to-circular waveguide TE₀₁The mode converter is a microwave passive device widely applied to the fields of satellite communication, satellite-borne radar, microwave measurement, microwave power synthesis and the like. Conventional rectangular waveguide TE₁₀To circular waveguide TE₀₁The mode converter has the problems of low conversion efficiency and narrow frequency range coverage. The invention realizes rectangular waveguide TE by a waveguide mode converter₁₀To circular waveguide TE₀₁Efficient rotation of modesAnd the frequency of the whole V-band (50GHz-75 GHz).

Disclosure of Invention

The invention mainly solves the technical problem of providing a waveguide mode converter for realizing rectangular waveguide TE₁₀To circular waveguide TE₀₁Efficient conversion of modes and coverage of the entire V-band (50GHz-75 GHz).

In order to solve the technical problem, one technical scheme adopted by the invention is to provide a waveguide mode converter, which comprises three sections of conversion bodies which are sequentially connected in series, wherein the first conversion body is a T-shaped gradual change conversion body and comprises a first input rectangular waveguide interface and a first output rectangular waveguide interface, and the long side of the first input rectangular waveguide interface is perpendicular to the long side of the first output rectangular waveguide interface; the second conversion body is a cross-shaped gradual change conversion body and comprises a second input rectangular waveguide interface and a second output cross-shaped waveguide interface, and the second input rectangular waveguide interface is matched with the first output rectangular waveguide interface; the third conversion body is a circular gradient conversion body and comprises a third input cross waveguide interface and a third output circular waveguide interface, and the third input cross waveguide interface is matched with the second output cross waveguide interface.

Preferably, the upper half part of the first input rectangular waveguide interface gradually decreases to the upper long side of the second output rectangular waveguide interface along the right-lower direction, and the lower half part of the first input rectangular waveguide interface gradually expands to the second output rectangular waveguide interface along the front-rear direction.

Preferably, the overall length of the first conversion body is 45mm, wherein the length of the long side of the first input rectangular waveguide interface is 3.759mm, and the length of the short side is 1.88 mm; the length of the long side of the first output rectangular waveguide interface is 7.518mm, and the length of the short side of the first output rectangular waveguide interface is 1.88 mm.

Preferably, the first transition body is a rectangular waveguide TE₁₀Mode conversion to rectangular waveguide TE₂₀Mode(s).

Preferably, four end corners of the second input rectangular waveguide interface extend obliquely to the right and intersect with each other to form the second output cross-shaped waveguide interface in a cross shape, wherein two end corners of a diagonal line of the second input rectangular waveguide interface form two end portions of the second output cross-shaped waveguide interface on the same straight line.

Preferably, the overall length of the second conversion body is 22mm, the length of the long side of the second input rectangular waveguide interface is 7.518mm, and the length of the short side of the second input rectangular waveguide interface is 1.88 mm; the distance between the center of the second output cross-shaped waveguide interface and the short side of each end of the second output cross-shaped waveguide interface is 3.96 mm.

Preferably, the second transition body is a rectangular waveguide TE₂₀Mode conversion into cross waveguide TE₂₂Mode(s).

Preferably, the long sides of the four ends of the third input cross waveguide interface gradually extend rightward, the short sides gradually expand and form arc sides, and finally the long sides and the short sides are converged to form the third output circular waveguide interface.

Preferably, the length of the third conversion body is 40mm, and the distance between the center of the third input cross-shaped waveguide interface and the short side of each end of the third input cross-shaped waveguide interface is 3.96 mm; the radius of the third output circular waveguide interface is 3.74 mm.

Preferably, the third transition body is a cross waveguide TE₂₂Mode conversion to circular waveguide TE₀₁Mode(s).

The invention has the beneficial effects that: the invention discloses a waveguide mode converter, which comprises three sections of conversion bodies which are sequentially connected in series, wherein the first conversion body is a T-shaped gradual change conversion body and comprises a first input rectangular waveguide interface and a first output rectangular waveguide interface, and the long side of the first input rectangular waveguide interface is vertical to the long side of the first output rectangular waveguide interface; the second conversion body is a cross-shaped gradual change conversion body and comprises a second input rectangular waveguide interface and a second output cross-shaped waveguide interface, and the second input rectangular waveguide interface is matched with the first output rectangular waveguide interface; the third conversion body is a circular gradient conversion body and comprises a third input cross waveguide interface and a third output circular waveguide interface, and the third input cross waveguide interface and the second output cross waveguide interfaceThe waveguide interfaces are matched. The invention realizes the TE rectangular waveguide on the frequency of the whole V wave band₁₀To circular waveguide TE₀₁Efficient conversion of the modes.

Drawings

FIG. 1 is a schematic structural diagram of an embodiment of a waveguide mode converter according to the present invention;

fig. 2 is a view of a first conversion body in another embodiment of a waveguide mode converter according to the present invention;

fig. 3 is a simulation of a first transition body in another embodiment of a waveguide mode converter according to the invention;

fig. 4 is a structural view of a second conversion body in another embodiment of the waveguide mode converter according to the present invention;

fig. 5 is a simulation diagram after a first transition body and a second transition body are cascaded in another embodiment of a waveguide mode converter according to the invention;

fig. 6 is a structural view of a third conversion body in another embodiment of the waveguide mode converter according to the present invention;

fig. 7 is a simulation diagram after a first transition body and a second transition body and a third transition body are cascaded in another embodiment of a waveguide mode converter according to the present invention;

fig. 8 is a simulation diagram after the first transition body and the second transition body and the third transition body are cascaded in another embodiment of the waveguide mode converter 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, the waveguide mode converter 1 includes three segments of converters connected in series in sequence, where the first converter 1 is a T-type gradually-changing converter, and includes a first input rectangular waveguide interface 101 and a first output rectangular waveguide interface 102, and a long side of the first input rectangular waveguide interface 101 and a long side of the first output rectangular waveguide interface 102 are perpendicular to each other; the second conversion body 2 is a cross-shaped gradual change conversion body and comprises a second input rectangular waveguide interface 201 and a second output cross-shaped waveguide interface 202, and the second input rectangular waveguide interface 201 is matched with the first output rectangular waveguide interface 102; the third conversion body 3 is a circular transition body, and includes a third input cross waveguide interface 301 and a third output circular waveguide interface 302, and the third input cross waveguide interface 301 is adapted to the second output cross waveguide interface 202.

Referring to fig. 2, the upper half of the first input rectangular waveguide interface 101 gradually decreases to the upper long side of the second output rectangular waveguide interface 102 along the right-lower direction, and the lower half of the first input rectangular waveguide interface 101 gradually expands to the second output rectangular waveguide interface 102 along the front-rear direction.

Specifically, the overall length of the first conversion body 1 is 45mm, wherein the size of the first input rectangular waveguide interface 101 is the V-band standard waveguide WR15, the length of the long side of the first input rectangular waveguide interface 101 is 3.759mm, and the length of the short side is 1.88 mm.

TABLE 1 rectangular waveguide mode Classification and cut-off wavelength

As can be seen from Table 1, the rectangular waveguide mode classification and cut-off wavelength table shows that when the cut-off wavelength of the rectangular waveguide is the same as the cut-off wavelength of the rectangular waveguide, TE is a measure of the difference between the input and output cut-off wavelengths₂₀The length of the long side of the die is TE₁₀Twice the length of the long side of the die; so that the first output rectangular waveguide interface 102The length of the long side is 7.518mm, and the length of the short side is 1.88 mm. The first transition body 1 is a rectangular waveguide TE₁₀Mode input and conversion into rectangular waveguide TE₂₀And (6) outputting the mode.

With reference to fig. 3, a simulation of the first conversion body 1 is performed. It can be seen that the rectangular waveguide TE is within the entire V-band of 50-75GHZ₁₀Mode to TE₂₀The mode loss is lower than 0.015dB, the return loss is lower than-30 dB, the mode conversion efficiency is 99.6 percent, and the TE is input into the rectangular waveguide₁₀The energy of the mode is converted into the rectangular waveguide TE of the output through the first converter mostly₂₀The energy of the mode.

With reference to fig. 4, four end corners of the second input rectangular waveguide interface 201 extend obliquely to the right and intersect to form a second output cross-shaped waveguide interface 202, wherein two end corners of a diagonal line of the second input rectangular waveguide interface 201 form two end portions of the second output cross-shaped waveguide interface 202 on the same straight line.

Specifically, the overall length of the second conversion body 2 is 22mm, the length of the long side of the second input rectangular waveguide interface 201 is 7.518mm, and the length of the short side is 1.88 mm; the length of the long side of the second output cross-shaped waveguide interface is generally selected from the length of the diagonal of the second input rectangular interface, which is about 7.749mm, and is optimized to be 7.92mm, i.e., the distance between the center of the second output cross-shaped waveguide interface 202 and the short side of each end of the second output cross-shaped waveguide interface is 3.96 mm. Rectangular waveguide TE to be inputted by the second conversion body₂₀Mode conversion into cross waveguide TE₂₂Mode output, the length of the short side of the second output cross-shaped waveguide interface 202 is 1.88 mm.

As shown in FIG. 5, the first and second converters were cascaded and then simulated, and it can be seen that the rectangular waveguide TE is present in the entire V-band (50-75GHz)₁₀Mode and cross waveguide TE₂₂The mode transmission loss is lower than 0.03dB, the return loss is lower than-25 dB, the conversion efficiency is 99.3%, and most of the energy in the TE10 mode of the rectangular waveguide is converted into the energy in the TE22 mode of the cross waveguide through the first converter and the second converter.

As shown in fig. 6, the long sides of the four ends of the third input cross waveguide interface 301 gradually extend to the right, the short sides gradually expand and form arc sides, and the four ends of the third input cross waveguide interface 301 finally converge into a third output circular waveguide interface 302.

The length of the third conversion body 3 is 40mm, and the distance between the center of the third input cross waveguide interface 301 and the short side of each end of the third input cross waveguide interface 301 is 3.96 mm; the radius of the third output circular waveguide interface depends on the cutoff wavelength of the circular waveguide TE01 mode.

TABLE 2 circular waveguide modes and cut-off wavelengths

As can be seen from table 3.1, a is c/1.64fc, where a is the radius of the third output circular waveguide interface, c is the propagation speed of light in vacuum, and fc is the frequency of the V-band, and fc is 50GHz, so a is 3.66mm, and the radius of the third output circular waveguide interface 302 is preferably 3.74 mm. The third converter is used for transforming the cross waveguide TE₂₂Mode conversion to circular waveguide TE₀₁Mode(s).

As shown in fig. 7, the first converter, the second converter, and the third converter are cascaded for simulation. It can be seen that the rectangular waveguide TE is within the entire V-band of 50-75GHZ₁₀Mode and circular waveguide TE₀₁The transmission loss of the mode is lower than 0.42dB, and the return loss is lower than-25 dB.

As shown in fig. 8, since the TE11 mode, the TM01 mode, the TE21 mode, and the simplest mode are still present in the circular waveguide, by simulating the transmission coefficients of the respective modes through HFSS, it can be seen that the suppression of other lower-order modes in the circular waveguide is mostly 40dB, and the conversion efficiency of the mode converter over the entire V-band is higher than 90.7%. The method has the characteristics of wide frequency band, low loss and high conversion efficiency.

The invention has the beneficial effects that: the invention discloses a waveguide mode converter, which comprises three sections of conversion bodies which are sequentially connected in series, wherein the first conversion body is a T-shaped gradual change conversion body and comprises a first input rectangular waveguide interface and a first output rectangular waveguide interface, and the long side of the first input rectangular waveguide interface is vertical to the long side of the first output rectangular waveguide interface; the second conversion body is a cross-shaped gradual change conversion body and comprises a second input rectangular waveguide interface and a second output cross-shaped waveguide interface, and the second input rectangular waveguide interface is matched with the first output rectangular waveguide interface; the third conversion body is a circular gradient conversion body and comprises a third input cross waveguide interface and a third output circular waveguide interface, and the third input cross waveguide interface is matched with the second output cross waveguide interface. The invention realizes the efficient conversion of the TE10 mode of the rectangular waveguide to the TE01 mode of the circular waveguide on the frequency of the whole V wave band.

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.