CN114421107A - Miniaturized broadband 90-degree waveguide conversion structure - Google Patents
Miniaturized broadband 90-degree waveguide conversion structure Download PDFInfo
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- CN114421107A CN114421107A CN202210047962.7A CN202210047962A CN114421107A CN 114421107 A CN114421107 A CN 114421107A CN 202210047962 A CN202210047962 A CN 202210047962A CN 114421107 A CN114421107 A CN 114421107A
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01P—WAVEGUIDES; RESONATORS, LINES, OR OTHER DEVICES OF THE WAVEGUIDE TYPE
- H01P5/00—Coupling devices of the waveguide type
- H01P5/08—Coupling devices of the waveguide type for linking dissimilar lines or devices
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Abstract
The invention discloses a miniaturized broadband 90-degree waveguide conversion structure, which belongs to the technical field of millimeter wave and terahertz frequency band 90-degree waveguide conversion structures, wherein the conversion structure is a metal cylinder with a butterfly-shaped through hole dug in the center, and a plane butterfly-shaped pattern of the butterfly-shaped through hole is an axisymmetric pattern; rotating the rectangular waveguide port by 45 degrees in the plane, respectively connecting a section of circular arc at the two narrow sides of the rectangular waveguide port, wherein the circle centers of the two circular arcs are both positioned at the geometric center of the rectangular waveguide port and the circle center angles are equal, and then connecting the end point of each circular arc with the middle point of the long side of the adjacent rectangular waveguide port, so that the formed plane figure outline is a plane butterfly pattern. The millimeter wave and terahertz frequency band waves complete 90-degree field conversion in the conversion structure provided by the invention, the structure is compact, the size is small, the processing is simple, the circular arc conversion structure is suitable for different working frequency bands by adjusting the central angle of the circular arc and the thickness of the metal cylinder, the bandwidth is relatively wide, the insertion loss is small, and the conversion structure has good universality and practical value.
Description
Technical Field
The invention belongs to the technical field of millimeter wave and terahertz frequency band 90-degree waveguide conversion structures, and particularly relates to a miniaturized broadband 90-degree waveguide conversion structure.
Background
In millimeter wave and terahertz frequency bands, in order to reduce loss, standard waveguides are basically adopted as interfaces and interconnection transmission lines for testing equipment and component modules. The waveguide ports are generally integrated with the flange, and the waveguide ports of the modules are often identical in size but orthogonal to each other, and need to be rotated 90 ° to be aligned. However, the modules are often fixed and cannot be changed, so that special waveguide 90-degree turning modules are needed to connect mutually orthogonal waveguide ports.
The traditional 90-degree waveguide conversion structure generally adopts a waveguide gradual change twisted structure, is complex in structure and difficult to process, has very long length, causes large transition loss and is not beneficial to system miniaturization. Meanwhile, an integrated and miniaturized millimeter wave and terahertz system is a current research hotspot, a module in the integrated system may have an E-plane probe and an H-plane probe, and in order to realize the E-plane to H-plane conversion of the miniaturized and low-loss waveguide, a traditional 90-degree waveguide conversion structure which cannot be integrated and miniaturized is not suitable any more. At present, some miniaturized 90-degree waveguide conversion structures such as I-shaped structures and the like exist, but the structures are difficult to align in assembly, cannot realize broadband transition, and cannot be suitable for different working frequency bands.
Therefore, the traditional 90-degree waveguide conversion structure cannot meet the current use requirement, and a novel miniaturized broadband 90-degree waveguide conversion structure is required in millimeter wave and terahertz frequency bands.
Disclosure of Invention
The invention aims to solve the problems in the prior art, and provides a miniaturized broadband 90-degree waveguide conversion structure which is suitable for different working frequency bands and has the advantages of wide working bandwidth and low loss.
The technical scheme adopted by the invention is as follows:
a miniaturized broadband 90-degree waveguide conversion structure is placed between two orthogonal rectangular waveguide ports, and is characterized in that the broadband 90-degree waveguide conversion structure is a metal cylinder with a butterfly-shaped through hole dug in the center, a plane butterfly-shaped pattern of the butterfly-shaped through hole is an axisymmetric pattern, and the plane butterfly-shaped pattern is obtained by the following method:
rotating a rectangular waveguide port by 45 degrees in the plane to which the rectangular waveguide port belongs, respectively externally connecting a section of circular arc at two narrow sides of the rectangular waveguide port, wherein the circle centers of the two circular arcs are both positioned at the geometric center of the rectangular waveguide port, and the circle center angles are equal, and then connecting the end point of each circular arc with the middle point of the long side of the adjacent rectangular waveguide port, so that the formed plane figure outline is the plane butterfly pattern.
Furthermore, the size of the metal cylinder is consistent with that of the flanges of the two orthogonal rectangular waveguides, and threaded holes are punched on the periphery of the metal cylinder, so that the metal cylinder is fixedly connected with the two orthogonal rectangular waveguide ports through a flange plate.
Further, the two rectangular waveguides are the same size.
Further, the central angle theta of the circular arc is 60-100 degrees.
Further, when the central angle θ is 90 °, the thickness h of the metal cylinder is 0.4 λg，λgIs the wavelength of a rectangular waveguide; when the central angle theta is less than 90 DEG, the thickness h of the metal cylinder is less than 0.4 lambdag(ii) a When the central angle theta is larger than 90 DEG, the thickness h of the metal cylinder is larger than 0.4 lambdag。
Furthermore, the broadband 90-degree waveguide conversion structure is suitable for different working frequency bands by adjusting the central angle of the circular arc and the thickness of the metal cylinder.
Further, the placement position of the broadband 90 ° waveguide conversion structure between two orthogonal rectangular waveguide ports satisfies that: the symmetry axis of the plane butterfly pattern forms an included angle of 45 degrees with the long side of the rectangular waveguide port.
The invention has the beneficial effects that:
the invention provides a miniaturized broadband 90-degree waveguide conversion structure, which is characterized in that a special butterfly-shaped through hole is arranged in the center of a metal cylinder, so that the 90-degree field conversion of millimeter wave and terahertz frequency band waves in the conversion structure is completed, a plurality of gradual change structure cascades are not needed, the structure is compact, the size is small, the processing is simple, meanwhile, the central angle of an arc and the thickness of the metal cylinder can be adjusted, the miniaturized broadband 90-degree waveguide conversion structure is suitable for different working frequency bands, has good universality, is relatively wide in broadband, is small in insertion loss and has good practical value.
Drawings
Fig. 1 is a schematic diagram illustrating a placement position of a butterfly via of a miniaturized broadband 90 ° waveguide conversion structure between two orthogonal rectangular waveguide ports according to embodiment 1 of the present invention;
fig. 2 is a schematic view of a metal cylinder of a miniaturized broadband 90 ° waveguide conversion structure provided in embodiment 1 of the present invention;
fig. 3 is a schematic diagram of a planar butterfly pattern of a miniaturized broadband 90 ° waveguide conversion structure according to embodiment 1 of the present invention; wherein, (a) is a detailed structure plan view, and (b) is a plan view profile;
fig. 4 is a perspective view of a miniaturized broadband 90 ° waveguide conversion structure provided in embodiment 1 of the present invention, placed between two orthogonal rectangular waveguide ports, along the wave transmission direction;
fig. 5 is a simulation result diagram of a miniaturized broadband 90 ° waveguide conversion structure provided in embodiment 1 of the present invention;
fig. 6 is a simulation result diagram of a miniaturized broadband 90 ° waveguide conversion structure provided in embodiment 2 of the present invention;
fig. 7 is a simulation result diagram of a miniaturized broadband 90 ° waveguide conversion structure provided in embodiment 3 of the present invention;
the reference symbols in the drawings are as follows:
1: an E-plane rectangular waveguide; 2: butterfly-shaped through holes of a broadband 90-degree waveguide conversion structure; 3: an H-plane rectangular waveguide; 4: a metal cylinder of a broadband 90-degree waveguide conversion structure; and a and b are respectively the middle points of two long sides of the waveguide port of the E-plane rectangular waveguide.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be further described in detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
Example 1
The embodiment provides a miniaturized broadband 90-degree waveguide conversion structure applied to a W frequency band (75-110 GHz), and the structure is as shown in fig. 1 and fig. 2, and is placed between a waveguide port of an orthogonal E-surface rectangular waveguide 1 and a waveguide port of an H-surface rectangular waveguide 3, wherein both the E-surface rectangular waveguide 1 and the H-surface rectangular waveguide 3 are WR10 standard waveguides (2.54mm 1.27 mm).
The broadband 90-degree waveguide conversion structure is a metal cylinder 4 with a butterfly-shaped through hole 2 dug in the center and a thickness h of 1.75mm, a plane butterfly pattern of the butterfly-shaped through hole 2 is an axisymmetric pattern, and as shown in fig. 3(a), the plane butterfly pattern is obtained by the following method:
the waveguide port of the E-plane rectangular waveguide 1 is rotated clockwise by 45 degrees in the plane to which the waveguide port belongs, two narrow sides of the waveguide port are respectively externally connected with a section of circular arc, the circle centers of the two circular arcs are both located at the geometric center of the waveguide port, the central angle theta is both 90 degrees, the end point of each circular arc is connected with the long side midpoint a or b of the adjacent waveguide port, and the plane figure outline formed by the connection is the plane butterfly pattern, as shown in fig. 3 (b).
The size of the metal cylinder 4 is consistent with that of the flanges of the E-surface rectangular waveguide 1 and the H-surface rectangular waveguide 3, and threaded holes are formed in the periphery of the metal cylinder, so that the metal cylinder is fixedly connected with the E-surface rectangular waveguide 1 and the H-surface rectangular waveguide 3 through flange plates.
The placement position of the broadband 90-degree waveguide conversion structure between the E-plane rectangular waveguide 1 and the H-plane rectangular waveguide 3 meets the following requirements: the symmetry axis of the plane butterfly pattern forms an included angle of 45 degrees with the long side of the E-plane rectangular waveguide 1 or the H-plane rectangular waveguide 3.
Because the WR10 standard waveguide is formed by matching two E-plane split blocks through pins, the joint of the two split blocks is the midpoint of the narrow edge of the WR10 standard waveguide, and the central angle θ of the circular arc is 90 °, when the broadband 90 ° waveguide conversion structure is assembled between the E-plane rectangular waveguide 1 and the H-plane rectangular waveguide 3, the joint of the circular arc end point of the planar butterfly pattern and the two split blocks is on the same plane, that is, the plane of the midpoint of the narrow edge of the WR10 standard waveguide, as shown in fig. 4, the alignment is convenient, and the assembly of the broadband 90 ° waveguide conversion structure is facilitated.
The electric field direction (PORT1) of the wave of the W frequency band (75-110 GHz) in the E-plane rectangular waveguide 1 is the upward direction vertical to the long edge of the waveguide PORT, the wave is transmitted to the broadband 90-degree waveguide conversion structure, the wave is gradually converted into the upward electric field direction in the broadband 90-degree waveguide conversion structure, and finally the wave is converted into the horizontal direction at the waveguide PORT connected with the H-plane rectangular waveguide 3, namely the direction vertical to the long edge of the waveguide PORT of the H-plane rectangular waveguide 3, namely the electric field direction (PORT2) of the wave of the W frequency band (75-110 GHz) in the H-plane rectangular waveguide 3.
The result of simulating the broadband 90-degree waveguide conversion structure in the embodiment is shown in fig. 5, and it can be seen that the working bandwidth of the S11 with the return loss below-20 dB is 71-115 GHz, the relative bandwidth is 47.3%, and the broadband characteristic is very good.
Example 2
In order to illustrate the adjustable characteristic of the thickness H of the metal cylinder, the embodiment provides a miniaturized broadband 90-degree waveguide conversion structure applied to a Y-band (170-260 GHz), the structure is placed between a waveguide port of an orthogonal E-plane rectangular waveguide and a waveguide port of an H-plane rectangular waveguide, and both the E-plane rectangular waveguide and the H-plane rectangular waveguide are WR4.3 standard waveguides (1.0922mm 0.5461 mm).
Compared with the embodiment 1, the broadband 90-degree waveguide conversion structure is different only in that: when a plane butterfly pattern is obtained, the circular arc is externally connected to the narrow edge of the WR4.3 standard waveguide, and the thickness h of the metal cylinder is adjusted to be 0.75 mm; the other structures are unchanged.
The broadband 90-degree waveguide conversion structure of the embodiment is simulated, and as a result is shown in fig. 6, it can be seen that the working bandwidth with the return loss of S11 below-20 dB can be extended to 165-268 GHz, the relative bandwidth is 47.6%, and the broadband 90-degree waveguide conversion structure also has good broadband characteristics, which proves the universality of the broadband 90-degree waveguide conversion structure.
Example 3
In order to illustrate the adjustable characteristic of the central angle θ of the circular arc, the present embodiment provides a miniaturized broadband 90 ° waveguide conversion structure applied to a W-band (75 to 110GHz), which is placed between the waveguide port of the orthogonal E-plane rectangular waveguide 1 and the waveguide port of the H-plane rectangular waveguide 3, and both the E-plane rectangular waveguide 1 and the H-plane rectangular waveguide 3 are WR10 standard waveguides (2.54mm × 1.27 mm).
Compared with the embodiment 1, the broadband 90-degree waveguide conversion structure is different only in that: adjusting the central angle theta to 75 degrees, and adjusting the thickness h of the metal cylinder to 1.6 mm; the other structures are unchanged.
The broadband 90-degree waveguide conversion structure of the embodiment is simulated, and as shown in fig. 7, S11 is less than-20 dB in a W-band full-band of 75-110 GHz, so that the broadband 90-degree waveguide conversion structure has good broadband characteristics.
While the invention has been described with reference to specific embodiments, any feature disclosed in this specification may be replaced by alternative features serving the same, equivalent or similar purpose, unless expressly stated otherwise; all of the disclosed features, or all of the method or process steps, may be combined in any combination, except mutually exclusive features and/or steps.
Claims (6)
1. A miniaturized broadband 90-degree waveguide conversion structure is placed between two orthogonal rectangular waveguide ports, and is characterized in that the broadband 90-degree waveguide conversion structure is a metal cylinder with a butterfly-shaped through hole dug in the center, the plane butterfly-shaped pattern of the butterfly-shaped through hole is an axisymmetric pattern, and the broadband 90-degree waveguide conversion structure is obtained by the following method:
rotating a rectangular waveguide port by 45 degrees in the plane, respectively externally connecting a section of circular arc at two narrow sides of the rectangular waveguide port, wherein the circle centers of the two circular arcs are both positioned at the geometric center of the rectangular waveguide port, and the circle center angles are equal, and then connecting the end point of each circular arc with the middle point of the long side of the adjacent rectangular waveguide port, so that the formed plane figure outline is the plane butterfly pattern.
2. The miniaturized broadband 90 ° waveguide transition structure of claim 1, wherein the metal cylinder is sized to conform to the flanges of the two orthogonal rectangular waveguides and is threaded around to fixedly connect the two orthogonal rectangular waveguide ports via a flange.
3. The miniaturized broadband 90 ° waveguide conversion structure of claim 1, wherein the central angle θ is 60 ° to 100 °.
4. The miniaturized broadband 90 ° waveguide conversion structure of claim 3, wherein when the central angle θ is 9At 0 deg. the thickness h of the metal cylinder is 0.4 lambdag，λgIs the wavelength of a rectangular waveguide; when the central angle theta is less than 90 DEG, the thickness h of the metal cylinder is less than 0.4 lambdag(ii) a When the central angle theta is larger than 90 DEG, the thickness h of the metal cylinder is larger than 0.4 lambdag。
5. The miniaturized broadband 90 ° waveguide transition structure of claim 1, wherein the broadband 90 ° waveguide transition structure is placed between two orthogonal rectangular waveguide ports at a position satisfying: the symmetry axis of the plane butterfly pattern forms an included angle of 45 degrees with the long side of the rectangular waveguide port.
6. The miniaturized broadband 90 ° waveguide conversion structure of claim 1, wherein the miniaturized broadband 90 ° waveguide conversion structure is suitable for different operating frequency bands by adjusting a central angle of an arc and a thickness of a metal cylinder.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202210047962.7A CN114421107A (en) | 2022-01-17 | 2022-01-17 | Miniaturized broadband 90-degree waveguide conversion structure |
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| CN202210047962.7A CN114421107A (en) | 2022-01-17 | 2022-01-17 | Miniaturized broadband 90-degree waveguide conversion structure |
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102694219A (en) * | 2011-03-22 | 2012-09-26 | 索尼公司 | Rotary joint for joining two waveguides |
| CN106299572A (en) * | 2016-08-24 | 2017-01-04 | 中国工程物理研究院电子工程研究所 | A kind of novel waveguide polarization mode conversion diaphragm structure being applied to Terahertz frequency range |
| CN113809496A (en) * | 2021-11-17 | 2021-12-17 | 中国电子科技集团公司第九研究所 | Miniaturized broadband high-frequency isolator |
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- 2022-01-17 CN CN202210047962.7A patent/CN114421107A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102694219A (en) * | 2011-03-22 | 2012-09-26 | 索尼公司 | Rotary joint for joining two waveguides |
| CN106299572A (en) * | 2016-08-24 | 2017-01-04 | 中国工程物理研究院电子工程研究所 | A kind of novel waveguide polarization mode conversion diaphragm structure being applied to Terahertz frequency range |
| CN113809496A (en) * | 2021-11-17 | 2021-12-17 | 中国电子科技集团公司第九研究所 | Miniaturized broadband high-frequency isolator |
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Application publication date: 20220429 |