CN114204242A - Millimeter wave soft waveguide preparation method and soft waveguide prepared by same - Google Patents
Millimeter wave soft waveguide preparation method and soft waveguide prepared by same Download PDFInfo
- Publication number
- CN114204242A CN114204242A CN202111518838.6A CN202111518838A CN114204242A CN 114204242 A CN114204242 A CN 114204242A CN 202111518838 A CN202111518838 A CN 202111518838A CN 114204242 A CN114204242 A CN 114204242A
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- Prior art keywords
- corrugated pipe
- millimeter wave
- wall
- waveguide
- core mold
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01P—WAVEGUIDES; RESONATORS, LINES, OR OTHER DEVICES OF THE WAVEGUIDE TYPE
- H01P11/00—Apparatus or processes specially adapted for manufacturing waveguides or resonators, lines, or other devices of the waveguide type
- H01P11/001—Manufacturing waveguides or transmission lines of the waveguide type
- H01P11/002—Manufacturing hollow waveguides
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01P—WAVEGUIDES; RESONATORS, LINES, OR OTHER DEVICES OF THE WAVEGUIDE TYPE
- H01P3/00—Waveguides; Transmission lines of the waveguide type
- H01P3/12—Hollow waveguides
- H01P3/127—Hollow waveguides with a circular, elliptic, or parabolic cross-section
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01P—WAVEGUIDES; RESONATORS, LINES, OR OTHER DEVICES OF THE WAVEGUIDE TYPE
- H01P3/00—Waveguides; Transmission lines of the waveguide type
- H01P3/12—Hollow waveguides
- H01P3/14—Hollow waveguides flexible
Abstract
The invention relates to the field of microwave transmission lines, and provides a millimeter wave soft waveguide preparation method and a prepared soft waveguide. A method for preparing millimeter wave soft waveguide comprises the steps of preparing a needed core mold by preprocessing a corrugated pipe, wherein the core mold is made of a low-melting-point metal material or a low-melting-point high-molecular polymer, and the external dimension of the core mold is consistent with the dimension of an inner cavity of the corrugated pipe; forming the inner wall and the outer wall of the corrugated pipe on the surface of the core mould by electroplating or chemical plating, firstly depositing the inner wall as a conductive layer, and then depositing the outer wall as the conductive layer; dissolving and removing the core mold by adopting a physical or chemical method to obtain the corrugated pipe with the hollow structure; the manufacturing problem of the flexible waveguide when the transmission frequency is higher than 50GHz is solved, the processing precision of the millimeter wave flexible waveguide is improved, the process is simple, and the mass manufacturing is easy; the prepared millimeter wave flexible waveguide still has good transmission performance, electrical performance and bending performance in a millimeter wave frequency band.
Description
Technical Field
The invention relates to the field of microwave transmission lines, in particular to a method for preparing a millimeter wave soft waveguide and the prepared soft waveguide, which are used for realizing effective transmission of millimeter wave band electromagnetic waves and belong to the field of soft waveguides and manufacturing thereof.
Background
In recent years, with the continuous development of weaponry, microwave transmission develops towards the direction of high frequency, wide frequency band and high power, compared with the traditional millimeter wave and centimeter wave microwave systems, the millimeter wave electronic system has a series of advantages of high tracking precision and guidance precision, low probability of electronic interference, good multi-target discrimination performance, high radar resolution, small multipath effect and ground clutter interference during low-angle tracking and the like, and is widely applied to the aspects of radar, guidance, tactical and strategic communication, electronic countermeasure, remote sensing, radiation measuring instruments and the like at present. The millimeter wave has higher frequency and larger bandwidth, so the resolution ratio is higher, the structure is lighter and smaller, and the millimeter wave has wide application prospect in the military fields of high-precision radar, guidance systems, electronic countermeasures and the like.
A soft waveguide is one of the important components in microwave electronics as an electrical connection between hard waveguides or between a hard waveguide and other microwave components. Soft waveguides have the advantage that good electrical performance is maintained in the bent state and during bending, compared to hard waveguides.
The existing preparation method of the flexible waveguide mainly comprises a copper strip winding method and an oil pressure forming method, and the two processes are only suitable for manufacturing the flexible waveguide with the frequency below 50 GHz. When the transmission frequency is higher than 50GHz, the copper strip winding method and the oil pressure forming method cannot meet the forming requirement of the corrugated pipe because the caliber of the corrugated pipe is small. Therefore, how to realize the forming of the small-caliber corrugated pipe by a millimeter wave soft waveguide preparation method becomes a problem to be solved urgently.
Disclosure of Invention
The invention aims to solve the technical problem of the prior art, provides a millimeter wave soft waveguide preparation method and a soft waveguide prepared by the same, and solves the problem of forming a small-caliber corrugated pipe with transmission frequency higher than 50 GHz.
In order to solve the technical problems, the invention adopts the following technical scheme:
a method for preparing a millimeter wave soft waveguide comprises the following steps:
the method comprises the following steps: pre-processing a core mould required for manufacturing the corrugated pipe, and designing and manufacturing according to the size and the length of the millimeter wave flexible waveguide corrugated pipe to be processed; the core mould material is selected from a low-melting-point metal material or a low-melting-point high-molecular polymer, and the external dimension of the core mould is consistent with the dimension of the inner cavity of the corrugated pipe;
step two: forming the inner wall and the outer wall of the corrugated pipe on the surface of the core mould by electroplating or chemical plating, firstly depositing the inner wall as a conductive layer, and then depositing the outer wall as the conductive layer;
step three: dissolving and removing the core mold by adopting a physical or chemical method to obtain the corrugated pipe with the hollow structure;
step four: two ends of the corrugated pipe are respectively welded with the flange plate, and then a layer of rubber sheath is prepared outside the corrugated pipe through a mould pressing process, so that the millimeter wave soft waveguide can be obtained.
The low-melting-point metal material can adopt low-temperature alloy.
The low-melting-point high-molecular polymer can be silicon rubber, polyvinyl chloride, polypropylene or ABS plastic.
The millimeter wave flexible waveguide prepared by the method comprises flanges, a corrugated pipe and a rubber sheath, wherein two ends of the corrugated pipe are fixedly connected with the two flanges, and the rubber sheath is arranged on the surface of the outer wall of the corrugated pipe; the inside and the outside of the corrugated pipe with the hollow structure are parallel annular grooves, the cross section shapes of the inner and the outer pipe walls of the annular grooves are similar to a sine curve, and the corrugations are distributed at equal intervals.
Furthermore, the outer wall of the corrugated pipe is a conducting layer made of nickel or copper and has the thickness of 0.1-0.2 mm; the inner wall of the corrugated pipe is a conductive layer made of silver or gold and has the thickness of 1 mu m.
Further, the cross section of the corrugated pipe is in a shape of a rounded rectangle, a circle or an ellipse.
Furthermore, the corrugated pipe is a small-caliber millimeter wave corrugated pipe, and the width, the depth and the pitch of the annular groove of the corrugated pipe are all smaller than one tenth of the wavelength of the electromagnetic wave transmission waveguide.
Compared with the prior art, the invention has the following beneficial effects:
1. the invention provides a millimeter wave flexible waveguide preparation method, which realizes the molding of a small-caliber corrugated pipe by casting a core mold, improves the machining precision of millimeter wave flexible waveguides, has simple process and is easy to manufacture in batches.
2. The millimeter wave soft waveguide prepared by the method has the corrugated pipe with the annular groove structure, has good electrical property and bending property, can efficiently transmit millimeter wave electromagnetic waves, and has higher millimeter wave frequency and larger bandwidth, so that the millimeter wave soft waveguide has higher resolution and lighter structure.
Drawings
FIG. 1 is a schematic view of the overall structure of a millimeter wave flexible waveguide;
FIG. 2 is a schematic view of a bellows structure;
FIG. 3, cross-sectional view of a bellows;
fig. 4 is a schematic view of the core mold structure.
Description of the reference numerals
1. Flange plate, 2 bellows, 3 rubber sheath.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and examples. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting.
The invention discloses a millimeter wave flexible waveguide, the whole structure of which is shown in figure 1 and consists of a flange plate 1, a corrugated pipe 2 and a rubber sheath 3, wherein the inside and the outside of the corrugated pipe 2 with a hollow structure are parallel annular grooves, the cross section shapes of the inner and the outer pipe walls of the annular grooves are similar to a sine curve, the corrugations are distributed at equal intervals, as shown in figure 2, two ends of the corrugated pipe 2 are welded with the two flange plates 1, and finally, a layer of rubber sheath 3 is molded on the outer wall surface of the corrugated pipe 2, so that the millimeter wave flexible waveguide can be obtained.
Furthermore, the outer wall of the corrugated pipe 2 is a conducting layer made of nickel or copper and has a thickness of 0.1-0.2 mm; the inner wall of the corrugated pipe 2 is a conductive layer made of silver or gold, the thickness of the conductive layer is 1 mu m, and insertion loss is reduced.
Further, the cross section of the corrugated pipe 2 in the present embodiment is a rounded rectangle, as shown in fig. 3. In other embodiments, bellows 2 may be circular or elliptical in cross-sectional shape.
Further, the corrugated pipe 2 is a small-caliber millimeter wave corrugated pipe, when the transmission frequency is higher than 50GHz, the width, depth and pitch of the annular groove of the corrugated pipe 2 are all less than one tenth of the wavelength of the electromagnetic wave transmitted, in this embodiment, the transmission frequency is 110GHz, the length and width of the rounded rectangle of the cross section of the corrugated pipe 2 are 2.5mm × 1.2mm, the depth is 0.4mm, and the corrugation pitch is 0.6 mm. The flexible waveguide with the structure has good electrical performance and bending performance, and can transmit millimeter wave electromagnetic waves with high efficiency.
In the embodiment, the flange plate 1 is made of copper alloy, and in other embodiments, the flange plate can also be made of aluminum alloy copper plating or nickel plating.
In this embodiment, the rubber sheath 3 is made of a silicone rubber material to improve the environmental resistance of the flexible waveguide.
The preparation method of the millimeter wave soft waveguide of the embodiment comprises the following steps:
the method comprises the following steps: the prefabricated corrugated pipe 2 is designed and manufactured according to the size and length of the millimeter wave flexible waveguide corrugated pipe to be processed. The core mold is cast according to the schematic core mold structure shown in fig. 4, the core mold material is a low-melting-point metal material or a low-melting-point high-molecular polymer, the low-temperature alloy is used as the core mold material in this embodiment, other embodiments may also use silicone rubber, polyvinyl chloride, polypropylene, ABS plastic, which are low-melting-point high-molecular polymers, a solid rounded-corner rectangular core mold is cast in the casting mold, and as the size of the inner cavity of the corrugated pipe 2 is the same as the size of the inner cavity of the corrugated pipe 2, the size is 2.5mm × 1.2mm, the depth is 0.4mm, and the corrugation pitch is 0.6mm, the thickness of the conductive layer and the conductive layer are added on the basis of the external size of the core mold;
step two: in the embodiment, chemical plating is adopted on the surface of the core mold to form the inner wall and the outer wall of the corrugated pipe 2, and in other embodiments, an electroplating mode can also be adopted; firstly, depositing an inner wall serving as a conducting layer, and then depositing an outer wall serving as the conducting layer, in the embodiment, firstly, electroplating and depositing a silver layer with the thickness of 1 mu m on the surface of a rounded rectangular core mold, and then, depositing a copper layer with the thickness of 0.1mm on the surface of the core mold after the silver layer is electroplated by an electrochemical deposition method;
step three: in the embodiment, a core mold made of low-temperature alloy is dissolved by using a concentrated alkali solution, and a corrugated pipe 2 with a hollow structure is obtained after a silver layer and a copper layer are left; in other embodiments, a core mold made by dissolving a low temperature alloy by physical heating may be used.
Step four: two ends of a corrugated pipe 2 are respectively welded with the flange plate 1, then a layer of silicon rubber sheath 3 is prepared outside the corrugated pipe through a mould pressing process and used as a protective layer, and the 110GHz millimeter wave flexible waveguide can be obtained.
The 110GHz flexible waveguide prepared in the above example was subjected to processing test, and the electrical properties thereof were: the voltage standing wave ratio VSWR is less than or equal to 1.30, the insertion loss IL is less than or equal to 1.0dB/100mm, and the high-voltage power amplifier has good electrical performance.
The above-described embodiments are only intended to illustrate the present invention, and not to limit the present invention, and any person skilled in the art may make various modifications, changes or substitutions without departing from the technical scope of the present invention, and therefore all equivalent technical methods are intended to be covered by the present invention.
Claims (7)
1. A method for preparing a millimeter wave soft waveguide comprises the following steps:
the method comprises the following steps: the core mold required by the manufacture of the corrugated pipe (2) is preprocessed, and the core mold is designed and manufactured according to the size and the length of the millimeter wave soft waveguide corrugated pipe (2) to be processed; the core mould material is a low-melting-point metal material or a low-melting-point high-molecular polymer, and the external dimension of the core mould is consistent with the dimension of the inner cavity of the corrugated pipe (2);
step two: forming the inner wall and the outer wall of the corrugated pipe (2) on the surface of the core mould through electroplating or chemical plating, firstly depositing the inner wall as a conductive layer, and then depositing the outer wall as the conductive layer;
step three: dissolving and removing the core mold by adopting a physical or chemical method to obtain the corrugated pipe (2) with a hollow structure;
step four: two ends of the corrugated pipe (2) are respectively welded with the flange plate (1), and then a layer of rubber sheath (3) is prepared outside the corrugated pipe (2) through a mould pressing process, so that the millimeter wave soft waveguide can be obtained.
2. The method for manufacturing a millimeter wave soft waveguide according to claim 1, wherein the low melting point metal material is a low temperature alloy.
3. The method for preparing a millimeter wave flexible waveguide according to claim 1, wherein the low-melting-point high-molecular polymer is silicone rubber, polyvinyl chloride, polypropylene or ABS plastic.
4. The flexible waveguide prepared by the method according to claim 1, which consists of flanges (1), a corrugated pipe (2) and a rubber sheath (3), wherein two ends of the corrugated pipe (2) are fixedly connected with the two flanges (1), and the rubber sheath (3) is arranged on the outer wall surface of the corrugated pipe (2); the method is characterized in that: the corrugated pipe (2) with the hollow structure is internally and externally provided with parallel annular grooves, the cross section of the inner pipe wall and the outer pipe wall of each annular groove is shaped like a sine curve, and the corrugations are distributed at equal intervals.
5. The flexible waveguide of claim 4, wherein: the outer wall of the corrugated pipe (2) is a conducting layer made of nickel or copper and has the thickness of 0.1-0.2 mm; the inner wall of the corrugated pipe (2) is a conductive layer made of silver or gold and has the thickness of 1 mu m.
6. A flexible waveguide according to claim 4 or 5, wherein: the cross section of the corrugated pipe (2) is in a shape of round corner rectangle, circle or ellipse.
7. The flexible waveguide of claim 6, wherein: the width, the depth and the pitch of the annular groove of the corrugated pipe (2) are all less than one tenth of the wavelength of the transmitted electromagnetic wave waveguide.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN202111518838.6A CN114204242A (en) | 2021-12-07 | 2021-12-07 | Millimeter wave soft waveguide preparation method and soft waveguide prepared by same |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202111518838.6A CN114204242A (en) | 2021-12-07 | 2021-12-07 | Millimeter wave soft waveguide preparation method and soft waveguide prepared by same |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3940718A (en) * | 1974-02-11 | 1976-02-24 | Tech Systems Corporation | Flexible wave guide and method for making same |
| DE3234699A1 (en) * | 1982-09-18 | 1984-03-22 | Licentia Patent-Verwaltungs-Gmbh, 6000 Frankfurt | Flexible waveguide for millimetric waves and a method for producing said waveguide |
| CN204632896U (en) * | 2015-03-25 | 2015-09-09 | 中国电子科技集团公司第二十三研究所 | The high-frequency of the little decay of a kind of low standing wave can turn round rectangular flecible waveguide |
| CN106463810A (en) * | 2014-05-28 | 2017-02-22 | 斯宾纳有限公司 | Flexible, bendable and twistable terahertz waveguide |
| CN112670692A (en) * | 2020-12-07 | 2021-04-16 | 电子科技大学 | Integral untwistable terahertz soft waveguide structure and preparation method thereof |
-
2021
- 2021-12-07 CN CN202111518838.6A patent/CN114204242A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3940718A (en) * | 1974-02-11 | 1976-02-24 | Tech Systems Corporation | Flexible wave guide and method for making same |
| DE3234699A1 (en) * | 1982-09-18 | 1984-03-22 | Licentia Patent-Verwaltungs-Gmbh, 6000 Frankfurt | Flexible waveguide for millimetric waves and a method for producing said waveguide |
| CN106463810A (en) * | 2014-05-28 | 2017-02-22 | 斯宾纳有限公司 | Flexible, bendable and twistable terahertz waveguide |
| CN204632896U (en) * | 2015-03-25 | 2015-09-09 | 中国电子科技集团公司第二十三研究所 | The high-frequency of the little decay of a kind of low standing wave can turn round rectangular flecible waveguide |
| CN112670692A (en) * | 2020-12-07 | 2021-04-16 | 电子科技大学 | Integral untwistable terahertz soft waveguide structure and preparation method thereof |
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Application publication date: 20220318 |