KR102463114B1 - Method for generating an antenna using metal 3d printing additive technique and chemical polishing method - Google Patents

Abstract

A method of generating an antenna using a 3D printing stacking technique and a chemical polishing method is a method of generating an up-skin part corresponding to the lower part in the stacking direction in a circular shape in which the shape of each slot for a plurality of slots of the antenna is a circular shape. step; stacking from the upskin portion to create a continuous continuous core portion of the slot; generating a down-skin portion corresponding to the upper portion in the stacking direction in the shape of each slot in a triangular shape, wherein three vertices of the triangular shape are round, curved, or curved; generating the antenna including the plurality of slots and the antenna body; and grinding the antenna by stirring it with a mixed solution containing phosphoric acid and sulfuric acid.

Description

METHOD FOR GENERATING AN ANTENNA USING METAL 3D PRINTING ADDITIVE TECHNIQUE AND CHEMICAL POLISHING METHOD

The present invention relates to a method for producing an antenna, and more particularly, to a method for producing an antenna using a 3D printing stacking technique and a chemical polishing method.

A flat antenna with a fine slot pattern is used in various ways in the defense/weapon industry. In particular, it is showing its value for searchers that detect and track missiles. The size of each slot determines the sensitivity of the entire antenna because very sensitive radio waves must be detected in order to track the exact position and speed. Therefore, uniform dimensional accuracy of tens to hundreds of micro-shaped slots is very necessary.

Conventionally, a micro-machining method using an endmill is used to manufacture a slotted flat antenna. A planar slot antenna requires a very complex electrical path to realize functions and performance, and a multi-layer structure is required for the sum-difference distribution of radio waves. For this reason, it is impossible to manufacture it with a general processing method. Therefore, the parts of each layer are machined and then joined by the deep brazing method, but the yield was not very good because the filler residue and electrical defects according to the skill of the workers occurred. In addition, there was a problem that the production period exceeded 3 months due to complicated manufacturing procedures such as machining, deep brazing bonding defects, and assembly defects, and it was very difficult to shorten the delivery period.

Due to these problems, metal 3D printing technology was introduced to solve the problems of the complexity of the existing manufacturing method, the limitations of miniaturization/light weight, the problems of yield, the high production cost, and the long production period. However, even when the antenna is manufactured according to the metal 3D printing technique, the dimensional defect of the micro-slot pattern in the generated antenna remains a big problem. In order to solve these problems, the dimensional compensation design of the antenna slot and the chemical process technology I would like to suggest

An object of the present invention is to provide a method of generating an antenna using a 3D printing stacking technique and a chemical polishing method.

Another technical problem to be achieved in the present invention is to provide an antenna produced by a 3D printing stacking technique and a chemical polishing method.

The technical problems to be achieved in the present invention are not limited to the technical problems mentioned above, and other technical problems not mentioned will be clearly understood by those of ordinary skill in the art to which the present invention belongs from the description below. will be able

In order to achieve the above technical problem, a method of generating an antenna using a 3D printing stacking technique and a chemical polishing method is an up-skin (up-skin) method in which the shape of each slot corresponds to the lower part in the stacking direction for a plurality of slots of the antenna. skin) generating a portion in a circular shape; continuously stacking with the upskin portion to create a core portion of the slot; generating a down-skin portion corresponding to the upper portion in the stacking direction in the shape of each slot in a triangular shape, wherein three vertices of the triangular shape are round, curved, or curved; generating the antenna including the plurality of slots and the antenna body; and grinding the antenna by stirring it with a mixed solution containing phosphoric acid and sulfuric acid.

When generating the triangular shape, each straight line between the lower vertices and the upper vertex in the stacking direction may be generated to be 45 degrees.

The method may further include washing the polished antenna using an ultrasonic cleaner with a cleaning agent mixture including fatty alcohol ethoxylate. The method may further include drying the washed antenna after washing in water. The phosphoric acid is 85% phosphoric acid and may account for 95% to 97.5% of the mixed solution. The time for performing the polishing may correspond to between 3 minutes and 5 minutes.

According to an embodiment of the present invention, there is an effect of preventing the collapse of the upper pattern and the dimensional mismatch phenomenon of the slot inside the antenna, and significantly improving the surface roughness of the slot surface after chemical polishing.

The performance of the antenna can be remarkably improved by resolving the collapse of the upper pattern of the slot and the dimensional mismatch phenomenon and significantly improving the surface roughness of the slot surface through chemical polishing.

In the case of manufacturing an antenna through such 3D printing stacking technique and chemical polishing, it is possible to reduce the quantity/light weight, and it has various advantages because it shows low manufacturing cost, short manufacturing time, and high yield.

The effects obtainable in the present invention are not limited to the above-mentioned effects, and other effects not mentioned may be clearly understood by those of ordinary skill in the art from the following description. will be.

BRIEF DESCRIPTION OF THE DRAWINGS The accompanying drawings, which are included as a part of the detailed description to help the understanding of the present invention, provide embodiments of the present invention, and together with the detailed description, explain the technical spirit of the present invention.
1 is a diagram illustrating a shape in a slot in an antenna.
FIG. 2 is an exemplary view for explaining a problem that appears during 3D printing manufacturing with the shape 100 of the slot shown in FIG. 1 .
3 is a view for explaining a method of redesigning the upper circular shape 120 of the slot of the antenna 10 according to an embodiment of the present invention.
FIG. 4 is a view for explaining a difference between a case in which the upper circular shape of the slot described in FIG. 3 is redesigned and a case in which it is not.
5 is a view exemplified for explaining a polishing process in a chemical (red) polishing method for implementing the micro-shape of an antenna slot proposed in the present invention, and FIG. 6 is a cleaning process in the chemical polishing method according to the present invention. It is a drawing exemplified for explanation.
7 and 8 are views showing the slot surface immediately after 3D printing and the slot surface after chemical polishing, respectively, according to the present invention.
9 is a graph showing the surface roughness according to the chemical polishing according to the present invention.
10 is an exemplary flowchart for explaining a method of generating an antenna using a 3D printing stacking technique and a chemical polishing method according to the present invention.

Hereinafter, preferred embodiments according to the present invention will be described in detail with reference to the accompanying drawings. DETAILED DESCRIPTION The detailed description set forth below in conjunction with the appended drawings is intended to describe exemplary embodiments of the present invention and is not intended to represent the only embodiments in which the present invention may be practiced. The following detailed description includes specific details in order to provide a thorough understanding of the present invention. However, it will be apparent to one skilled in the art that the present invention may be practiced without these specific details.

In some cases, well-known structures and devices may be omitted or shown in block diagram form focusing on core functions of each structure and device in order to avoid obscuring the concept of the present invention. In addition, the same reference numerals are used to describe the same components throughout this specification.

The present invention intends to propose a method for securing the precise dimensions of the micro-shape of the slot in the antenna when manufacturing an antenna (eg, a flat antenna, etc.) using a metal 3D printing stacking technique. A flat-panel antenna is used as an antenna for an RFID reader, an antenna for a repeater, and an array antenna for a base station.

During metal 3D printing, dimensional defects may occur due to sintered powder that is not completely melted around the microformed shape of the slot. In addition, due to the collapse of the micro-shaped upper intaglio of the slot, it deviates from the target dimension compared to the drawing dimension. Therefore, in the present invention, in order to solve the defect caused by the sintered powder and the defect caused by the collapse of the intaglio, a design method for dimensional compensation and a method for securing accurate dimensions in micrometers through chemical polishing are proposed.

The fine shape manufacturing of the antenna slot proposed in the present invention uses the DfAM (Design for Additive Manufacturing) technique by adding the additive concept to DFM (Design for Manufacturing) in 3D printing. DFAM is a design concept for maximizing the advantages of 3D printing, and it can be called a design for additive manufacturing. In the past, the cutting process made by cutting iron had severe limitations in shape, and it was impossible to produce complex drawings. There are various cutting methods such as 4 axis and 5 axis, but there is a limit to manufacturing complex and precise parts due to the nature of the cutting tool that cuts iron while rotating at high speed. Additive manufacturing has the advantage that there is no need to worry about impossible parts when designing because there are no restrictions on the shape as long as there is a supporter because additive manufacturing creates a shape by stacking materials in contrast to cutting processing.

Difficulty in modeling microscopic features in 3D printing

3D printing refers to a printing technology that manufactures real products by laminating a large amount of thin layers, unlike mechanical cutting. Existing cutting processing was possible to produce only the allowable area of the machine axis, but 3D printing can create complex shapes that were not possible in machining without limiting the shape. Various materials such as plastics, metals, and ceramics can be used and are being actively used in various industries. However, there are several limitations in the manufacturing of 3D printing methods, and the limitations can be broadly expressed in two ways. When the antenna is manufactured by the 3D printing stacking method, the upper pattern collapse of the slot inside the antenna occurs and the dimensional mismatch phenomenon occurs.

1 is a diagram illustrating a shape in a slot in an antenna.

A plurality of slots exist in an antenna (eg, a flat (type) antenna), and a slot pattern 100 is formed as shown in FIG. 1 when the antenna is manufactured by a 3D printing stacking technique. That is, for reasons such as the performance of the antenna, the slot in the antenna is generally formed in a circular shape at the top and the bottom based on the stacking direction. The lower circular shape is stacked to form a portion corresponding to the body part of the antenna, and then the upper circular shape is stacked. The inside 130 of the slot is a hole 130 . At this time, since the inside of the slot is the hole 130 , the upper circular-shaped part of the slot becomes a downward-facing surface, and the upper circular-shaped part becomes the down-skin surface/part 110 . Since the inside of the slot is a hole 130 , the lower circular shape of the slot becomes an upward-facing surface, thus becoming an Up-skin surface/part 120 .

FIG. 2 is an exemplary view for explaining a problem that appears during 3D printing manufacturing with the shape 100 of the slot shown in FIG. 1 .

The first limitation was that the upper pattern collapsed by the stacking method occurred as a limitation in manufacturing the antenna by the metal 3D printing stacking method. If the lower molten metal supports it, it can be shaped as shown in the drawing, but if the lower part is maintained in a powder state rather than a molten metal, the molten metal collapses toward the powder by gravity. For this reason, a support structure (support) is generally applied to maintain the upper shape of the slot. However, when a support structure is applied to a micro-shape, it becomes difficult to preserve the shape when the support structure (support) is removed later. Due to this problem, it is very difficult to form/create several tens to hundreds of microscopic shapes.

FIG. 2 shows the collapse of the upper pattern of the slot that occurs when the slot of the antenna is manufactured by the metal 3D printing lamination technique. In the upper shape of the slot of FIG. 2 , it can be seen that the burr is generated by looking at the portion 115 marked with a circle on the left. Even after 3D printing is completed and chemical polishing is performed, it can be seen that the burrs still remain. The portion 118 where the burr remains is shown.

Looking at the slot shape shown on the rightmost side of FIG. 2 , burr did not occur in the part (up-skin part) 120 corresponding to the lower part based on the stacking direction, so the burr does not remain in the end. can be known However, a burr 115 was generated in the part (down-skin part) 110 corresponding to the above part based on the stacking direction, and even if chemical fogging is performed after 3D printing is completed, the burr 118 remains. . The burr 115 generated during 3D printing and the burr 118 remaining even after chemical misting affect the micro-shape of the slot, resulting in a problem of degrading the performance of the antenna.

Proposal of design method in 3D printing (DfAM)

As a method for improving the formability of the upper shape of the slot (eg, the downskin portion 120 ), first consider the degree of freedom in the arrangement of the slot. The fine shape of the slot applied to the vertical arrangement is more likely to collapse toward the powder because the influence of gravity is large and a large area on the powder is melted at once. Therefore, in this case, the influence of gravity can be reduced by changing the arrangement angle of the slot.

Collapsing can be improved primarily by locating the slot direction at the top of the part and tilting the part to apply an angle. However, it is not possible to completely ensure the micro-formability of the upper circular shape 110 of the slot in the stacking direction. This is because the circular area is larger than the minimum collapsible area. Therefore, it is necessary to redesign to secure the minimum collapsible area. In the present invention, in order to minimize collapse in the upper shape of the slot, the downskin part corresponding to the upper circular shape 110 is changed to a triangular shape and each vertex is curved, curved, or rounded (round) by applying a metal 3D printing A design proposal is proposed to maximize the improvement of formativeness.

3 is a view for explaining a method of redesigning the upper circular shape 120 of the slot of the antenna 10 according to an embodiment of the present invention.

As described above, since the upper portion of the slot is formed in a circular shape 110, the center portion is liable to collapse due to gravity. The larger the size, the more severe the collapse. In order to solve this problem, it is proposed to change the upper circular shape 110 to a triangular straight shape. At this time, vertices are generated in the triangular shape, and since the vertices have a very small cross-sectional area, it is easy to become a fracture starting point when used as a product in the future. Therefore, in the triangular shape, three vertices are designed to be curved, curved, or round.

As shown in the lower part of FIG. 3 , the angle of the straight line in the triangular shape may be designed to have an interval of 0 degrees to 60 degrees. Preferably, it may be preferable that the angle of the straight shape is 45 degrees. As the triangular shape is redesigned, the radius of the three vertices can be changed by 0.1 to 1 times compared to the radius of the circular shape before the compensation design. At this time, the lower part (upskin part) 120 of the slot does not collapse and maintains robustness because the supporting structure is a molten metal body. Therefore, the lower shape 120 of the slot does not need to be redesigned and may be manufactured in a circular shape.

FIG. 4 is a view for explaining a difference between a case in which the upper circular shape of the slot described in FIG. 3 is redesigned and a case in which it is not.

In part (a) shown in FIG. 4 , the angle of the triangular linear shape is 0 degrees, so that the upper shape of the slot is a circular shape, which corresponds to the original shape before the redesign. That is, part (a) is a case where the triangular shape is not redesigned. In this case (a) and the top shape of the slot shows a clear collapse. In addition, as shown in the dotted box shape, there is a large amount of burrs due to the sintered powder. This is caused by a phenomenon that occurs as the portion just below the upper circle remains in the state of metal powder, and collapses downward without supporting the molten metal due to gravity.

It was confirmed that the upper collapsed occurred despite the fine pattern of 0.5mm in width, and the size error at this time was also unacceptably generated compared to the drawing. It shows the limitations of microfabrication of metal 3D printing.

Therefore, looking at the results of applying the triangular slot shape proposed in the present invention, as shown in FIG. it can be seen that This can be said to be the result of using the result of using the result of forming rather wide rather than realizing a local part of a very fine area due to the characteristics of metal 3D printing. The dimensional accuracy at this time was confirmed to be almost identical to the drawing dimensions.

When the angle of the triangular straight line (shape) is designed to be 60 degrees as in FIG. 4(c), the upper collapse phenomenon is improved compared to the case where it is 0 degrees, but some burrs are present.

As described above, by redesigning the upper circular shape of the slot into a triangular shape and adjusting the angle of the triangular straight shape, it is possible to eliminate the upper collapsing phenomenon that occurs during metal 3D printing additive manufacturing. However, even if the top collapse phenomenon is removed, there is a limitation in that the dimension corresponding to the above-described second limit point is not accurate.

The dimensional accuracy of the existing machining method can be up to 1um. However, it is not easy to guarantee the precision of several um in the metal 3D printing technology that melts and manufactures powder having a size of about 40 μm. When forming a fine shape, it is easy to cause a dimensional mismatch phenomenon due to the sintered powder that is not completely melted. Moreover, it is difficult to secure the surface roughness due to the sintered powder.

In order to overcome this second limitation, chemical polishing is performed after manufacturing the antenna in a 3D printing stacking method with a slot shape according to the technique of redesigning (or compensating design) into a triangular shape of the downskin part of the slot proposed in the present invention. I would like to suggest how to do it.

As-built (immediately after printing) metal 3D printing results are inevitably found with traces of dross powder and layer grain due to the nature of the technology, so the surface roughness is relatively poor.

As a general method of improving the surface roughness of metal 3D printing results, mechanical processing such as sand blasting, shot peening, and barrel finishing has been mainly used. This is a method to improve the surface of a product by spraying a fine dedicated media on the surface with strong pressure or by putting it in a rotating body and applying a large force per unit area. However, it is difficult to achieve a uniform quality of surface roughness due to the large difference in the degree of polishing depending on the work method and skill level of the operator. It has several problems, such as loss of a significant part.

Abrasive Flow Machining (AFM) processing has also been used as the number of cases of manufacturing complex internal channels, which were impossible to process with conventional cutting methods, by metal 3D printing increases, It has the disadvantage of being difficult to see, and it has a problem that it cannot withstand the pressure of the AFM if the rigidity of the entire structure is insufficient.

In the present invention, by using the principle of causing a rapid reaction when acidic liquid and metal meet, PBF (Powder Bed Fusion) method as built surface roughness and shape trend in RAW Surface (Ra. 7~12micron) range of metal printing products The ideal recipe (acidic liquid, additive, processing temperature, processing time, post-cleaning method) is used to improve the surface roughness of 2 to 6 microns (Ra.), and to avoid structural stress because no physical force is applied. suggest to do In addition, since the metal 3D printing result is basically molded on the powder bed of spherical powder using a laser, the surrounding powder is pre-sintered on the adjacent surface of the melted surface due to the conductive properties of the applied heat (referred to as the Dross Effect), and the entire surface It is possible to quantitatively and uniformly remove the phenomenon occurring over the

Chemical polishing is a method of chemically dissolving the convex part of a metal surface to make it shiny and smooth the object to be polished by simply immersing the metal or alloy in a solution such as a strong acid, strong alkali, or oxidizing agent. In chemical polishing, the concentration of acid and the type of oxidizing agent are important conditions instead of voltage or current, and polishing is uniform in each part (excellent uniformity). In addition, there is an advantage in that the operation is simple and the non-uniformity is small.

Hereinafter, a chemical (red) polishing method for implementing the micro-shape of the slot of the antenna proposed by the present invention will be described in detail. The composition of the compound to be used for chemical polishing according to the present invention, polishing rate, duration, and shape/area will be described below.

5 is a view exemplified for explaining a polishing process in a chemical (red) polishing method for implementing the micro-shape of an antenna slot proposed in the present invention, and FIG. 6 is a cleaning process in the chemical polishing method according to the present invention. It is a drawing exemplified for explanation.

Referring to FIG. 5 , in the entire process of the chemical polishing method, a workpiece (an antenna manufactured according to the present invention) is polished, washed, and washed with water in the sequence. The polishing liquid may be a mixture of phosphoric acid, sulfuric acid, surfactant, and the like. The mixed solution is mixed with phosphoric acid (H3PO4), copper sulfate (CuSO4), CH4N2O, C4H6O4, ion exchange water, and the like. Agitation (churn) conditions may be, for example, 200 to 220 rpm. Depending on the type of aluminum alloy of the metal powder used for 3D printing, the mixing ratio of the polishing liquid and the polishing conditions may be changed. In addition, it is necessary to manage the concentration and acidity of the polishing liquid according to the type of aluminum alloy of the metal powder. As shown in FIG. 5 , it can be confirmed that the hardened layer is removed through the polishing process.

The following Table 1 is a table illustrating a basic reaction background range in chemical polishing according to the present invention, and Table 2 is a table illustrating an ideal standard recipe in chemical polishing according to the present invention.

Referring to Table 2, alloy originally means an alloy, and is a metal made by combining several metals. The mixture contains 85% phosphoric acid, ion-exchanged water, and a stabilizer that prevents rejection when the mixture is mixed. Preferably, in the mixed solution of 85% phosphoric acid, a component ratio of 95% to 97.5%, ion-exchanged water 1.5%, and a stabilizer may occupy 1%. The mixture is preferably stirred for 3 to 5 minutes on the workpiece (antenna) manufactured according to the present invention.

Referring to Table 2 and FIG. 6 , after the polishing process is performed, cleaning using an ultrasonic cleaner is performed. The cleaning using such an ultrasonic cleaner goes through three steps as shown in FIG. 6 . In this case, the temperature of the ultrasonic cleaner may be about 40 degrees Celsius. For the cleaning agent, use a weak alkaline highly concentrated cleaning agent (used in an ultrasonic cleaner after diluting in water). In the washing process, 1) wash with a weak alkali highly concentrated detergent, and 2) wash again with a weak alkali highly concentrated detergent. The cleaning agent may consist of a cleaning agent mixture other than fatty alcohol ethoxylate. The concentration of the cleaning agent can be changed according to the amount of cleaning of the workpiece or sample.

Thereafter, a washing process is performed. Wash the cleaned workpiece (antenna) in running water at medium pressure. Depending on the size and surface area of the workpiece or sample, the cleaning time may vary. After washing, dry the workpiece to complete the chemical polishing process.

7 and 8 are views showing the slot surface immediately after 3D printing and the slot surface after chemical polishing, respectively, according to the present invention.

7, Specimen A is AlSi12Mg, which is an aluminum alloy series, Specimen B is Ti64 (titanium), and Specimen C is AlSi10Mg, which is an aluminum alloy series, according to the present invention. The slot surface after chemical polishing is shown.

As shown in FIG. 7 , it can be seen that the surface roughness of the slot surface after chemical polishing is significantly improved. This surface roughness improvement curiously improves the performance of the antenna. In this way, the surface roughness of various alloys is improved by using a combination recipe of an acid and an alkali solution. High level of 3D printing for parts printed with various materials such as aluminum, copper, titanium, plastic, steel, rubber, stainless, and silicon Surface roughness can be realized.

Referring to FIG. 8 , the sintered powder remains on the slot edge before chemical polishing, and the arithmetic mean roughness (Ra) as a parameter representing the surface roughness was 9.0 microns. After performing the chemical polishing according to the present invention, the slot edge sintered powder is removed, and it can be seen that the Ra is 6.1, and the surface roughness of 30% is improved.

9 is a graph showing the surface roughness according to the chemical polishing according to the present invention.

Referring to FIG. 9 , when the antenna was manufactured using the specimen as AlSi12Mg, the roughness of the slot surface was Ra = 9.2 immediately after 3D printing output, but after chemical polishing according to the present invention, it was lowered to 3.2, and the surface of the slot after chemical polishing was lowered to 3.2. The illuminance was improved by about 65%. When the specimen was made of Ti64 (titanium), Ra = 11.1 immediately after 3D printing, but was lowered to Ra = 5.8 after chemical polishing, and the roughness of the slot surface was improved by about 48%. In addition, when the specimen was AlSi10Mg2, Ra = 12.1 immediately after 3D printing, but was lowered to Ra = 4.3 after chemical polishing, and the roughness of the slot surface was improved by about 64.5%.

According to the present invention, if the polishing method using a chemical reaction between the polishing liquid and the metal is used, it is possible to effectively improve the surface roughness by uniformly removing the traces of dross powder and layer texture generated over the entire surface, unlike the physical polishing method.

According to an embodiment of the present invention, if each subdivided chemical polishing recipe (acidic liquid, additive, processing temperature, processing time, post-washing method, etc.) specialized for each shape, material, and size is applied, the result of PBF metal 3D printing is Immediately after printing, Ra. The surface roughness of 7 to 12 microns is approximately Ra. It can be improved to the level of 2-6 microns.

If the polishing method using the chemical reaction of putting the metal into the polishing liquid is adopted, the surface roughness of all areas of the printout, including the areas that the media cannot reach when the conventional physical method is adopted, can be relatively uniformly and effectively improved. Lastly, it has an efficient and economical advantage as it does not require expensive/heavy-weight facilities such as various grinding equipment and CNC equipment.

10 is an exemplary flowchart for explaining a method of generating an antenna using a 3D printing stacking technique and a chemical polishing method according to the present invention.

Referring to FIG. 10 , for a plurality of slots of the antenna, an up-skin portion corresponding to a lower portion in the stacking direction is generated in a circular shape in the shape of each slot ( S1010 ). Then, the upskin part is continuously stacked to create a core part of the slot (S1020). In addition, a down-skin portion corresponding to the upper portion in the stacking direction is generated in a triangular shape in the shape of each slot. At this time, the three vertices of the triangular shape are generated in the form of a round, curved or curved surface (S1030). Through these steps, a plurality of slots are respectively created.

Thereafter, an antenna is finally created including the antenna body in addition to the plurality of generated slots ( S1040 ). The core portion in each slot corresponds to the body portion in the antenna. The slot and the slot are connected to each other by the antenna body.

Thereafter, the antenna is polished by the chemical polishing method described in the present invention, such as polishing by stirring with a mixed solution containing phosphoric acid and sulfuric acid (S1050).

The embodiments described above are those in which elements and features of the present invention are combined in a predetermined form. Each component or feature should be considered optional unless explicitly stated otherwise. Each component or feature may be implemented in a form that is not combined with other components or features. It is also possible to configure embodiments of the present invention by combining some elements and/or features. The order of operations described in the embodiments of the present invention may be changed. Some features or features of one embodiment may be included in another embodiment, or may be replaced with corresponding features or features of another embodiment. It is obvious that claims that are not explicitly cited in the claims can be combined to form an embodiment or included as a new claim by amendment after filing.

It is apparent to those skilled in the art that the present invention may be embodied in other specific forms without departing from the essential characteristics of the present invention. Accordingly, the above detailed description should not be construed as restrictive in all respects but as exemplary. The scope of the present invention should be determined by a reasonable interpretation of the appended claims, and all modifications within the equivalent scope of the present invention are included in the scope of the present invention.

Claims (7)

In the method of manufacturing an antenna while compensating for the microscopic dimension of the slot of the antenna when manufacturing the antenna according to the metal 3D printing lamination technique,
generating an up-skin portion corresponding to a lower portion in a stacking direction for each slot of the antenna in a circular shape;
continuously stacking on the upskin portion to create a core portion of each slot;
generating a down-skin portion corresponding to an upper portion in a stacking direction for each slot in a triangular shape, but generating three vertices of the triangular shape in a round, curved or curved shape;
generating the antenna including each of the generated slots and an antenna body; and
A method of manufacturing an antenna comprising the step of grinding the antenna by stirring with a mixed solution containing phosphoric acid and sulfuric acid. The method of claim 1,
In the case of generating the triangular shape of the downskin portion, a straight line between the lower vertices and the upper vertex in the stacking direction is generated to be 45 degrees. The method of claim 1,
The method of claim 1, further comprising washing the polished antenna with a cleaning agent mixture containing fatty alcohol ethoxylate using an ultrasonic cleaner. 4. The method of claim 3,
Further comprising the step of washing the washed antenna in water and then drying the antenna manufacturing method. The method of claim 1,
The method for manufacturing an antenna, wherein the phosphoric acid is 85% phosphoric acid and accounts for 95% to 97.5% in the mixed solution. The method of claim 1,
The time for performing the polishing corresponds to between 3 minutes and 5 minutes, the antenna manufacturing method. An antenna manufactured by the method according to any one of claims 1 to 6.

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