CN114083169A - Flexible connection process method and tool for converting radio frequency coaxial to microstrip - Google Patents
Flexible connection process method and tool for converting radio frequency coaxial to microstrip Download PDFInfo
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- CN114083169A CN114083169A CN202111522241.9A CN202111522241A CN114083169A CN 114083169 A CN114083169 A CN 114083169A CN 202111522241 A CN202111522241 A CN 202111522241A CN 114083169 A CN114083169 A CN 114083169A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K31/00—Processes relevant to this subclass, specially adapted for particular articles or purposes, but not covered by only one of the preceding main groups
- B23K31/02—Processes relevant to this subclass, specially adapted for particular articles or purposes, but not covered by only one of the preceding main groups relating to soldering or welding
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D33/00—Special measures in connection with working metal foils, e.g. gold foils
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K11/00—Resistance welding; Severing by resistance heating
- B23K11/36—Auxiliary equipment
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K37/00—Auxiliary devices or processes, not specially adapted to a procedure covered by only one of the preceding main groups
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
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- Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks
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Abstract
The invention provides a flexible connection process method for converting radio frequency coaxial into microstrip, which fixedly connects a radio frequency coaxial core wire with a microstrip line through an omega-shaped interconnection connecting wire, and comprises the following steps: s1, preparing an omega-shaped interconnection connecting wire and a high-temperature soldering lug material by adopting a forming tool; s2, placing the omega-shaped interconnection connecting wire, the high-temperature soldering lug material and the radio frequency coaxial core wire in a spot welding area of a spot welding tool; step S3, connecting the omega-shaped interconnection connecting wire, the high-temperature soldering lug material and the radio frequency coaxial core wire in a resistance spot welding mode; step S4, performing gold removing treatment on the microstrip line; and step S5, connecting the end of the omega-shaped interconnection connecting line, which is not welded with the radio frequency coaxial core wire, with the microstrip line by soldering iron. The invention realizes the interconnection of the coaxial core wire and the microstrip line by adopting high-temperature spot welding and low-temperature tin soldering, not only meets the requirement of microwave transmission performance, but also has the advantages of high reliability, strong fatigue resistance and strong universality.
Description
Technical Field
The invention belongs to the technical field of microwave assembly, and particularly relates to a flexible connection process method and a flexible connection tool for a microwave assembly radio frequency coaxial microstrip-to-microstrip.
Background
Along with the continuous improvement of the performance requirements of equipment, the application of radio frequency microwave modules/components is more and more extensive, the radio frequency coaxial connector is used as the most basic input/output connection unit of microwave products, and the transition connection process from the inner conductor core wire to the microstrip line is a key factor for ensuring the connection reliability and the transmission performance, so that how to realize the high-reliability connection of the radio frequency coaxial microstrip rotation is a problem which is widely researched by numerous scholars.
In the prior art, research on a connection mode of a coaxial-to-microstrip mainly focuses on the inside of a radio frequency module, and the connection mode includes a tin soldering connection mode and a gold strap ring-clad welding mode. However, under the condition that microwave component products are more and more complex, the coaxial core wire of the assembled input/output port of the microwave module needs to be further connected with an external microstrip circuit, which is different from the connection inside the module, the structure and materials involved in the connection mode are more complex, the material parameters adopted by the box body of the microwave module, the microstrip substrate and the box body of the microwave component may have larger differences, and larger alternating stress is generated at the connection position due to the difference of linear expansion coefficients in the service process.
In the connection mode of the radio frequency coaxial microstrip, a tin soldering connection mode is beneficial to ensuring the microwave transmission performance, but the tin soldering connection mode is generally applied to the connection inside the module. The gold-strip loop package welding mode has higher requirements on the plating layers on the surfaces of the microstrip line and the radio frequency coaxial core wire, the interconnection process has certain ablation risk when being used on a radio frequency microstrip plate, the process control difficulty is higher, and the rigidity and the connection reliability of the gold-strip loop package interconnection cannot meet the service requirements of products aiming at microwave assemblies with complex structures and larger sizes. Meanwhile, no relevant research is found on a high-reliability interconnection process method of the module coaxial core wire and the external microstrip line.
Disclosure of Invention
The invention aims to provide a flexible connection process method and a flexible connection tool for converting radio frequency coaxial to microstrip, which have the advantages of high reliability, strong fatigue resistance and strong universality.
In order to achieve the above object, the present invention provides a flexible connection process for converting a radio frequency coaxial line to a microstrip line, wherein a radio frequency coaxial core line is fixedly connected with the microstrip line through an omega-shaped interconnection connection line, and the process comprises the following steps: s1, preparing an omega-shaped interconnection connecting wire and a high-temperature soldering lug material by adopting a forming tool; s2, placing the omega-shaped interconnection connecting wire, the high-temperature soldering lug material and the radio frequency coaxial core wire in a spot welding area of a spot welding tool; step S3, connecting the omega-shaped interconnection connecting wire, the high-temperature soldering lug material and the radio frequency coaxial core wire in a resistance spot welding mode; step S4, performing gold removing treatment on the microstrip line; and step S5, connecting the end of the omega-shaped interconnection connecting line, which is not welded with the radio frequency coaxial core wire, with the microstrip line by soldering iron.
The omega-shaped interconnection connecting line is made of rolled copper foil materials, and the arc radius of the convex part of the omega-shaped interconnection connecting line is 0.25-0.35 mm.
The step S1 of preparing the "Ω" shaped interconnection connection line and the high temperature solder tab material includes the following steps: step S101, carrying out surface plating treatment and heat treatment on the omega-shaped interconnection connecting line; s102, designing a forming tool of the omega-shaped interconnection connecting line according to the forming size requirement; step S103, manufacturing a plurality of omega-shaped interconnection connecting lines on the rolled copper foil material processed in the step S101 by adopting the forming tool designed in the step S102, and cutting the omega-shaped interconnection connecting lines according to the distance between the radio frequency coaxial core wire and the microstrip line; and S104, preparing a high-temperature soldering lug according to the size of the radio frequency coaxial core wire and the spot welding area.
The placing process in step S2 specifically includes: step S201, designing a spot welding tool according to the structure and the external dimension of the radio frequency coaxial connector; s202, placing the welding end of the radio frequency coaxial core wire on a spot welding tool; step S203, placing a high-temperature soldering lug on the welding end of the radio frequency coaxial core wire; s204, placing one end of the omega-shaped interconnection connecting line on a high-temperature soldering lug, wherein the high-temperature soldering lug is preferably eutectic material, and the melting point of the eutectic material is more than or equal to 280 ℃; the melting point of the soldering material used for soldering the soldering iron is less than or equal to 183 ℃.
Wherein, step S1 the shaping frock for press the rolling copper foil of strip form "omega" shape interconnect line (6), it includes: the two ends of the bottom of the upper pressing die are respectively provided with a positioning block; the array of the plurality of convex blocks is arranged between the two positioning blocks; the two ends of the top of the lower pressing die are respectively provided with a positioning groove; the number of the grooves is the same as that of the convex blocks (811), and the grooves are arranged between the two positioning grooves in an array manner; the positions and the shapes of the positioning blocks and the positioning grooves correspond to one another, and the positions and the shapes of the protruding blocks and the grooves correspond to one another.
Preferably, the shape of the convex block is an omega-shaped bulge; the shape of the groove is matched with that of the convex block; and placing the rolled copper foil between an upper pressing die and a lower pressing die, enabling each convex block to be clamped with each groove in a one-to-one correspondence manner, and applying pressure to the upper pressing die to enable the rolled copper foil to form a plurality of omega-shaped interconnection connecting lines.
Preferably, the molding tool is made of a brass material.
Preferably, the spot welding tool in step S2 is configured to weld and connect the "Ω" shaped interconnection connection line with the radio frequency coaxial core wire and the microstrip line, and includes: the center of the supporting table is a hollowed-out structure, and the shape of the hollowed-out structure is matched with the shape and the size of the radio frequency coaxial connector; a plurality of spot welding grooves which are respectively arranged on the inner ring edge of the support platform; the center of the radio frequency coaxial connector is horizontally provided with the radio frequency coaxial core wire.
Preferably, the spot welding groove includes: a first support portion, a second support portion, and a hollow ring; the two supporting parts are rectangular groove bodies with the depth smaller than that of the hollow ring, and the first supporting part and the second supporting part are symmetrically connected to two sides of the hollow ring; when the omega-shaped interconnection connecting wire is placed in the spot welding groove, one end of the omega-shaped interconnection connecting wire is placed on the corresponding first supporting part, the other end of the omega-shaped interconnection connecting wire is in contact with the welding end of the radio frequency coaxial core wire placed on the second supporting part and the high-temperature soldering lug, and the protruding part of the omega-shaped interconnection connecting wire is located in the hollow ring. .
Preferably, the spot welding tool is made of a synthetic stone material.
In summary, compared with the prior art, the flexible connection process method and the tool for converting the radio frequency coaxial to the microstrip provided by the invention have the following beneficial effects:
1. the rolled copper foil material is adopted as an interconnection material, and surface plating and heat treatment are carried out on the interconnection material, so that the interconnection material has excellent interconnection welding process performance and fatigue resistance;
2. accurately forming the interconnected copper foil into an omega shape by adopting a tool according to the transmission performance requirement of a microwave product, and carrying out tin coating treatment on a tin soldering part; firstly, the interconnection of a coaxial core wire and one end of an omega-shaped connecting copper foil is realized by adopting a high-temperature soldering lug matched with spot welding, and then the interconnection of the other end of the coaxial core wire and a microstrip line is realized by adopting a low-temperature soldering mode, so that the remelting of a high-temperature spot welding spot can not be caused by the low-temperature soldering;
3. the process method is stable and reliable, has excellent fatigue resistance of the interconnection welding spot, and is particularly suitable for the high-reliability interconnection of the coaxial core wire and the microstrip line of the microwave assembly with large difference of linear expansion coefficients and complicated structure.
Drawings
FIG. 1 is a schematic view of an embodiment of a radio frequency coaxial microstrip connection according to the present invention;
FIG. 2 is an enlarged view of the "omega" -shaped interconnect line of FIG. 1;
FIG. 3 is a schematic structural view of an omega-shaped connecting copper foil forming tool;
FIG. 4 is a schematic structural view of a module spot welding fixture;
fig. 5 is an enlarged view of the "core wire spot welding region" in fig. 4.
Detailed Description
The technical solution, the structural features, the achieved objects and the effects of the embodiments of the present invention will be described in detail with reference to fig. 1 to 5 of the embodiments of the present invention.
It should be noted that the drawings are simplified in form and not to precise scale, and are only used for convenience and clarity to assist in describing the embodiments of the present invention, but not for limiting the conditions of the embodiments of the present invention, and therefore, the present invention is not limited by the technical spirit, and any structural modifications, changes in the proportional relationship, or adjustments in size, should fall within the scope of the technical content of the present invention without affecting the function and the achievable purpose of the present invention.
It is to be noted that, in the present invention, relational terms such as first and second, and the like are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus.
The invention provides a flexible connection process method and a tool for converting a microwave assembly radio frequency coaxial into a microstrip, as shown in figure 1, the microwave assembly comprises: the module comprises a microstrip substrate 1, a module box body 2, a component combination body 3 and a radio frequency coaxial connector 4; the microstrip substrate 1 and the module box body 2 are fixedly arranged on the component box body 3 in a threaded connection mode; the rf coaxial connector 4 is soldered to the module case 2. Further, as shown in fig. 1, a radio frequency coaxial core wire 5 is horizontally arranged in the center of the radio frequency coaxial connector 4; a microstrip line 7 is fixed on the microstrip substrate 1; the radio frequency coaxial core wire 5 is fixedly connected with the microstrip line 7 by adopting an omega-shaped interconnection connecting wire 6. The invention realizes the connection of the radio frequency coaxial core wire 5 of the input and output port of the complex microwave component and the external microstrip line 7 (namely the external microstrip circuit) by arranging the omega-shaped interconnection connecting wire 6.
Wherein, an enlarged view of the "Ω" shaped interconnection line is shown in fig. 2, in this embodiment, the diameter D of the rf coaxial core 5aThe thickness is 0.35mm, the core wire is made of kovar alloy, and the surface is plated with gold; the width of the microstrip line 7 is 0.55mm, the microstrip line is made of copper, the surface of the microstrip line is plated with nickel and gold, and the thickness h of the microstrip line 7 is 15-40 mu m; the material of the omega-shaped interconnection connecting line 6 is rolled copper foil, the thickness of the copper foil (namely the thickness of the omega-shaped interconnection connecting line 6) is 0.04mm, the width of the copper foil (namely the width of the omega-shaped interconnection connecting line 6) is 0.5mm, and the circular arc radius r of the convex part of the omega-shaped interconnection connecting line 61And the arc radius r of the joint of the convex part and the straight line part of the omega-shaped interconnection connecting line 62All the sizes of the components are 0.3 mm; wherein the arc radius range of the convex part is 0.25-0.35 mm; furthermore, one end of the omega-shaped interconnection connecting line 6 is connected with the radio frequency coaxial core wire 5 through high-temperature spot welding to form a spot welding point A, and the other end of the omega-shaped interconnection connecting line is connected with the microstrip line 7 through low-temperature tin soldering to form a tin soldering point B, so that the flexible connection of the radio frequency coaxial-to-microstrip is realized.
The high-temperature soldering lug used in the spot welding spot A is made of gold-germanium alloy; the tin soldering welding point B is made of SnPb tin wire with the diameter of 0.5 mm. The two ends of the omega-shaped interconnection connecting line 6 adopt different welding methods and use welding materials with different melting points, so that the welding of the omega-shaped interconnection connecting line 6, the radio frequency coaxial core wire 5 and the microstrip line 7 is more stable and reliable.
As shown in fig. 3, the forming tool provided by the present invention is used for pressing a strip-shaped rolled copper foil to form an "Ω" shaped interconnection line 6, and includes: an upper pressing die 801, the two ends of the bottom of which are respectively provided with a positioning block 812; a plurality of bumps 811 arranged in an array between two positioning blocks 812; the lower pressing die 802 is provided with positioning grooves 822 at two ends of the top thereof respectively; a plurality of grooves 821, the number of which is the same as that of the protrusions 811, are arranged between the two positioning grooves 822 in an array; each positioning block 812 corresponds to each positioning groove 822 in position and shape, and each protrusion 811 corresponds to each groove 821 in position and shape; when the rolled copper foil is placed on the lower pressing die 802, two ends of the rolled copper foil cannot cover two positioning grooves 822 at two ends of the lower pressing die 802, the upper pressing die 801 is pressed on the lower pressing die 802, the positioning blocks 812 are clamped with the positioning grooves 822, each protruding block 811 is clamped with each groove 821 in a one-to-one correspondence manner, a certain pressure is applied to the upper pressing die 801, and finally the rolled copper foil forms a plurality of omega-shaped interconnection connecting lines 6.
Wherein, the shape of the convex block 811 is an omega-shaped convex to meet the microwave transmission performance requirement; the shape of the groove 821 is matched with that of the convex blocks 811, namely, the convex blocks 811 are tightly attached to each other when being clamped into the groove 821, so that the omega-shaped interconnection connecting line 6 with corresponding shape and size can be formed on the rolled copper foil by pressing; further, the molding tool is made of a brass material.
As shown in fig. 4, the spot welding tool provided by the present invention is used for welding and connecting the "Ω" shaped interconnection connection line 6 with the radio frequency coaxial core wire 5 and the microstrip line 7, and includes: the center of the supporting table 9 is a hollow structure, and the shape of the hollow structure is matched with the shape and the size of the radio frequency coaxial connector 4; a plurality of spot welding grooves 901 which are respectively opened at the inner ring edge of the support table 9 as spot welding areas; as shown in fig. 4 and 5, the present embodiment provides 2 spot welding grooves, and the spot welding groove 901 includes: two supports and a hollow ring 913; each supporting part is a rectangular groove body with the depth smaller than that of the hollow ring 912, the two supporting parts are symmetrically connected to two sides of the hollow ring 912, the first supporting part 911 is used for supporting one end, connected with the microstrip line 7, of the omega-shaped interconnection connecting line 6, the second supporting part 912 is used for supporting the welding end of the radio frequency coaxial core line 5, and the welding end of the radio frequency coaxial core line 5 is connected with one end, not connected with the microstrip line, of the omega-shaped interconnection connecting line 6; when the omega-shaped interconnection connecting line 6 is placed on the spot welding groove 901, the protruding part of the omega-shaped interconnection connecting line 6 is positioned in the hollow ring 913, so that one end of the omega-shaped interconnection connecting line 6 is just placed on the corresponding first supporting part 911, and the other end of the omega-shaped interconnection connecting line is in contact with the welding end of the radio frequency coaxial core wire 5 and the high-temperature soldering lug which are placed on the second supporting part 912; the spot welding tool is made of synthetic stone materials and can resist high temperature and prevent static electricity.
It should be noted that, the process method for performing the soft connection between the radio frequency coaxial core wire 5 and the microstrip line 7 by using the forming tool and the spot welding tool includes the following steps:
step S1, preparing the omega-shaped interconnection connecting wire 6 by using the forming tool, and preparing a high-temperature soldering lug material;
s2, correspondingly placing the omega-shaped interconnection connecting wire 6, the high-temperature soldering lug material and the radio-frequency coaxial core wire 5 in a spot welding area of the spot welding tool;
step S3, spot welding is carried out on the omega-shaped interconnection connecting wire 6, the high-temperature soldering lug material and the radio frequency coaxial core wire 5 in a resistance spot welding mode;
step S4, performing gold removal processing on the microstrip line 7; soldering the end of the omega-shaped interconnection connecting wire 6 which is not soldered with the radio frequency coaxial core wire 5 with the microstrip line 7 by adopting a soldering iron soldering mode;
through the steps of S1 to S4, the radio frequency coaxial core wire 5 is connected to the microstrip line 7 through the omega-shaped interconnection connection wire 6, and finally the welding spot is cleaned and the welding quality is checked.
Wherein the high-temperature soldering lug is a eutectic material, and the melting point of the eutectic material is more than or equal to 280 ℃; the melting point of the soldering material used for soldering the soldering iron is less than or equal to 183 ℃.
The step S1 of preparing the "Ω" shaped interconnection connecting wire 6 and the high temperature solder tab material specifically includes the following steps:
step S101, carrying out surface plating treatment and heat treatment on a rolled copper foil material adopted by the omega-shaped interconnection connecting wire 6;
s102, designing a forming tool of the omega-shaped interconnection connecting line 6 according to the forming size requirement;
step S103, manufacturing the rolled copper foil material processed in the step S101 into an omega-shaped interconnection connecting line 6 by adopting the forming tool designed in the step S102, and cutting the omega-shaped interconnection connecting line 6 according to the distance between the radio frequency coaxial core wire 5 and the microstrip line 7 so as to meet the matching requirement;
and step S104, preparing a high-temperature soldering lug according to the size and the spot welding area of the radio frequency coaxial core wire 5.
Further, in the step S101, the surface plating treatment of the rolled copper foil material is a nickel-gold plating treatment to ensure that the copper foil has good weldability; the heat treatment is annealing treatment at 350-400 ℃ to ensure that the copper foil has good anti-fatigue property; the thickness of the high-temperature soldering lug prepared in the step S105 is 0.0254mm, the length and the width of the high-temperature soldering lug are 0.3mm, and the high-temperature soldering lug is cut and prepared under a microscope.
The placing process in step S2 specifically includes:
step S201, designing a spot welding tool according to the structure and the external dimension of the radio frequency coaxial connector 4;
step S202, placing the welding end of the radio frequency coaxial core wire 5 on a second supporting part 912 in a spot welding groove 901 on a spot welding tool;
step S203, placing a high-temperature soldering lug on the welding end of the radio frequency coaxial core wire 5;
step S204, one end of the "Ω" shaped interconnection wire 6 is placed on the high temperature solder, the protruding portion thereof is placed in the hollow ring 913 of the spot-welding groove 901, and the other end is placed on the first support portion 911 of the spot-welding groove 901.
In this embodiment, the process parameters of the resistance spot welding in step S3 are the spot welding pressure 3.2N, the spot welding voltage 1.2V, and the spot welding time 20 ms.
In step S4, first, tin coating and cleaning are performed on the soldering iron soldering surface, and then soldering iron soldering is performed; in the embodiment, the soldering temperature of the soldering iron is 270 +/-5 ℃, and the soldering time is 1-2 s.
In the steps of the soft connection process method, firstly, high-temperature spot welding of one end of the omega-shaped interconnection connecting line 6 and the radio frequency coaxial core line 5 is carried out, and then low-temperature tin soldering of the other end of the omega-shaped interconnection connecting line 6 and the microstrip line 7 is realized, so that the risk of ablation easily caused by traditional microstrip line spot welding is solved, the welding temperature gradient at two ends of the omega-shaped interconnection connecting line 6 is pulled, and the difficulty of the interconnection process is obviously reduced.
In summary, compared with the existing interconnection welding process, the radio frequency coaxial microstrip flexible connection process method and the tooling provided by the invention have the advantages that the rolled copper foil material with excellent fatigue resistance is adopted as the material of the interconnection connecting line, the required omega-shaped connection is formed according to the microwave transmission performance requirement, and the connection with the radio frequency coaxial core wire and the microstrip line is realized by adopting the spot welding and soldering modes, so that the defects existing in the prior art of direct soldering connection or gold strip ring-wrapped connection are effectively overcome, and the interconnection reliability in the service process of a complex microwave assembly is ensured.
While the present invention has been described in detail with reference to the preferred embodiments, it should be understood that the above description should not be taken as limiting the invention. Various modifications and alterations to this invention will become apparent to those skilled in the art upon reading the foregoing description. Accordingly, the scope of the invention should be determined from the following claims.
Claims (10)
1. A flexible connection process method for converting radio frequency coaxial to microstrip is characterized in that a radio frequency coaxial core wire (5) is fixedly connected with a microstrip line (7) through an omega-shaped interconnection connecting wire (6), and the flexible connection process method comprises the following steps:
s1, preparing an omega-shaped interconnection connecting wire (6) by adopting a forming tool, and preparing a high-temperature soldering lug material;
s2, placing the omega-shaped interconnection connecting wire (6), the high-temperature soldering lug material and the radio frequency coaxial core wire (5) in a spot welding area of a spot welding tool;
step S3, connecting the omega-shaped interconnection connecting wire (6), the high-temperature soldering lug material and the radio frequency coaxial core wire (5) in a resistance spot welding mode;
and step S4, connecting the end of the omega-shaped interconnection connecting wire (6) which is not welded with the radio frequency coaxial core wire (5) with the microstrip line (7) by soldering iron.
2. The flexible connection process method for RF coaxial microstrip according to claim 1, wherein the omega-shaped interconnection line (6) is made of rolled copper foil material, and the arc radius of the convex part is 0.25-0.35 mm.
3. The flexible connection process method for rf coaxial microstrip according to claim 2, wherein the step S1 of preparing the "Ω" shaped interconnection wire (6) and the high temperature solder bump material comprises the following steps:
step S101, carrying out surface plating treatment and heat treatment on the omega-shaped interconnection connecting wire (6);
s102, designing a forming tool of the omega-shaped interconnection connecting line (6) according to the forming size requirement;
step S103, manufacturing a plurality of omega-shaped interconnection connecting lines (6) on the rolled copper foil material processed in the step S101 by adopting the forming tool designed in the step S102, and cutting the omega-shaped interconnection connecting lines (6) according to the distance between the radio frequency coaxial core wire (5) and the microstrip line (7);
and step S104, preparing a high-temperature soldering lug according to the size of the radio frequency coaxial core wire (5) and the spot welding area.
4. The flexible connection process method for rf coaxial microstrip according to claim 3, wherein the step S2 comprises the following steps:
step S201, designing a spot welding tool according to the structure and the external dimension of the radio frequency coaxial connector (4);
s202, placing the welding end of the radio frequency coaxial core wire (5) on a spot welding tool;
step S203, placing a high-temperature soldering lug on the welding end of the radio frequency coaxial core wire (5);
and step S204, one end of the omega-shaped interconnection connecting wire (6) is placed on the high-temperature welding sheet.
Wherein the high-temperature soldering lug is a eutectic material, and the melting point of the eutectic material is more than or equal to 280 ℃; the melting point of the soldering material used for soldering the soldering iron is less than or equal to 183 ℃.
5. The flexible connection process method for rf coaxial microstrip according to claim 3, wherein the forming tool in step S102 is used to press the rolled copper foil strip into the "Ω" shaped interconnection line (6), and the forming tool includes:
an upper pressing die (801), wherein positioning blocks (812) are respectively arranged at two ends of the bottom of the upper pressing die;
a plurality of raised blocks (811) arranged in an array between two positioning blocks (812);
the two ends of the top of the lower pressing die (802) are respectively provided with a positioning groove (822);
a plurality of grooves (821) which are the same as the number of the convex blocks (811) and are arranged between the two positioning grooves (822) in an array manner;
the positioning blocks (812) correspond to the positioning grooves (822) in position and shape one by one, and the protruding blocks (811) correspond to the grooves (821) in position and shape one by one.
6. The flexible connection process method of the radio frequency coaxial microstrip according to claim 5, wherein the shape of the bump (811) is an "Ω" shaped bump; the shape of the groove (821) is matched with that of the convex block (811); the rolled copper foil is placed between an upper die (801) and a lower die (802) so that each bump (811) is caught in each groove (821) in one-to-one correspondence, and pressure is applied to the upper die (801) so that the rolled copper foil forms a plurality of omega-shaped interconnection lines (6).
7. The flexible connection process method for the radio frequency coaxial microstrip according to claim 5 or 6, wherein the forming tool is made of brass.
8. The flexible connection process method for converting a radio frequency coaxial to a microstrip according to claim 4, wherein the electric welding tool in step S201 is used for welding and connecting the "Ω" shaped interconnection connection line (6) with the radio frequency coaxial core wire (5) and the microstrip line (7), and the electric welding tool comprises:
the center of the supporting table (9) is a hollow structure, and the shape of the hollow structure is matched with the shape and size of the radio frequency coaxial connector (4);
a plurality of spot welding grooves (901) which are respectively arranged on the inner ring edge of the support platform (9);
the center of the radio frequency coaxial connector (4) is horizontally provided with the radio frequency coaxial core wire (5).
9. The flexible connection process method of radio frequency coaxial microstrip according to claim 8, wherein said spot welding slot (901) comprises: a first support part (911), a second support part (912), and a hollow ring (913); the two supporting parts are rectangular groove bodies with the depth smaller than that of the hollow ring (913), and the first supporting part (911) and the second supporting part (912) are symmetrically connected to the two sides of the hollow ring (913);
when the omega-shaped interconnection connecting wire (6) is placed in the spot welding groove (901), one end of the omega-shaped interconnection connecting wire (6) is placed on the corresponding first supporting part (911), the other end of the omega-shaped interconnection connecting wire is in contact with the welding end of the radio frequency coaxial core wire (5) placed on the second supporting part (912) and the high-temperature welding sheet, and the protruding part of the welding end is located in the hollow ring (913).
10. The flexible connection process method for the radio frequency coaxial microstrip according to claim 8 or 9, wherein the spot welding tool is made of a synthetic material.
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