KR100642007B1 - Method of manufacturing an antenna for a wireless communication terminal - Google Patents

Abstract

A method of manufacturing an antenna for a wireless communication terminal is disclosed. The method of manufacturing an antenna for a wireless communication terminal includes integrally forming the antenna radiator and the terminal mounting part by a single process, and this step may be performed using die casting, sintering or metal powder injection molding. In addition, the method for manufacturing an antenna for a wireless terminal includes a step of integrally forming the radiator forming portion and the terminal mounting portion to be formed of the helix by a single process, this step may be performed by forging or the like.

Die Casting, Sintering, Metal Powder Injection Molding, Forging, Helical Antenna

Description

Manufacturing method of antenna for wireless communication terminal {METHOD FOR PRODUCING AN ANTENNA FOR RADIO COMMUNICATION DEVICE}

1A to 1C show an antenna for a wireless communication terminal according to the prior art.

FIG. 2 shows a conventional method of manufacturing the antenna of FIG. 1A. FIG.

3 shows a conventional method of manufacturing the antenna of FIG.

4 is a view showing a method for manufacturing an antenna according to an embodiment of the present invention.

5 is a view showing a method for manufacturing an antenna according to another embodiment of the present invention.

* Explanation of symbols for main parts of drawings *

10: helix 12: space

16, 20, 26: terminal mounting portion 18: through hole

22: lower through hole 28: helix forming part

The present invention relates to a method of manufacturing an antenna for a wireless communication terminal, and more particularly, to a method of manufacturing a helical antenna in which the radiator and the terminal mounting portion are integrally formed.

As wireless communication has developed, the miniaturization of terminals has been accelerated, and efforts for miniaturization of antennas have been made accordingly. As a means of miniaturization of such an antenna, a helical antenna obtained by modifying an existing half wave dipole antenna in the form of a helix is known. However, since the helical antenna has a disadvantage in that the bandwidth is narrower than that of the dipole antenna, various attempts have been made to solve this problem.

In one such attempt, US Pat. No. 4,772,895 discloses an antenna that includes a relatively long first helix and a relatively short second helix wound through a dielectric on the first helix. However, the US patent has a problem in that an unbalanced circuit is formed in which the signal and the ground are provided to the antenna through a coaxial cable, so that impedance matching between the antenna and the external circuit is not achieved. In addition, due to the structural characteristics of the helical antenna, which can be modeled by several parallel LC resonant circuits connected in series, the helical antenna has a relatively large goodness (Q) value, which does not fundamentally solve the problem of narrow bandwidth. .

As another helical antenna, US Pat. No. 5,661,495 discloses an antenna comprising an antenna rod that can move up and down through an internal cavity of the helical antenna and the helical antenna. The antenna of the US patent achieves miniaturization of the antenna by using a quarter wave antenna. However, not only the problem of impedance mismatch between the helical antenna and the external circuit has been solved, but also the problem of high good quality, that is, the narrow bandwidth, which is a problem caused by the structure of the helical antenna, has not been solved fundamentally.

As an antenna to solve this problem, Korean Patent No. 374752 of the present applicant discloses a helical antenna including an impedance transformer. 1A illustrates a helical antenna including an impedance transformer according to the Korean patent. The antenna of the Korean patent includes a helix 10, a disc 14 integrally formed with the helix 10, and a screw terminal mounting portion 16, in particular a space 12 formed between the helix 10 and the disc. It includes. Such a helical antenna of FIG. 1A has the effect of adding series capacitance to the parallel LC resonant circuit by the helix by forming a space 12 between the helix 10 and the disc. Accordingly, in the helical antenna, series resonance is generated along with parallel resonance, thereby compensating for high goodness of the helix itself and extending the bandwidth. In addition, since the space 12 also operates as an impedance transformer, impedance matching can be achieved by adjusting the size of the space 12, and a balanced circuit can be formed.

In addition, Korean Utility Model No. 253148 of the present applicant discloses a helical antenna having another structure that solves the above problem. 1B shows a helical antenna according to the utility model. The helical antenna shown in FIG. 1B includes a helix 10 and a terminal mounting portion 20, and includes a through hole 18 formed at a connection portion of the helix 10 and the terminal mounting portion 20. This through hole 18 plays the same role as the space of patent 374752, thereby extending the bandwidth of the antenna and achieving impedance matching. Further, the through hole 18 also functions as a passage through which the dielectric inside the antenna is discharged to the outside when the dielectric is coated on the antenna.

The helical antenna disclosed in the applicant's patent and utility model may be used as a retractable antenna by forming a through hole in the terminal mounting portion so as to penetrate through a cavity formed in the center of the helix, and inserting an antenna rod therein. have. In addition, it is also possible to use the rod alone without inserting the rod, and in this case, a lower through hole for screwing may be formed in the terminal mounting portion. FIG. 1C illustrates an antenna having a bottom through hole for using the antenna of FIG. 1B alone. FIG. That is, the screw is fastened to the lower through hole 22, the terminal and the antenna are coupled.

Since the antenna shown in FIGS. 1A to 1C are all integrally formed with the terminal mounting part and the helix, the manufacturing process is simpler than the structure in which the helix is formed separately and coupled to the terminal mounting part.

FIG. 2 shows a conventional method of manufacturing the antenna of FIG. 1A.

First, a cylindrical conductor is prepared to form an antenna, and drilling and turning is performed to form the helix forming portion 28, the disc 14, and the terminal mounting portion 16 integrally (step (a)). Next, in step (b), the helix forming unit 28 is slotted to form the helix 10, and finally, in step (c), the space 12 is formed to complete the helical antenna.

3 illustrates a conventional method of manufacturing the antenna of FIG. 1C.

Again, a cylindrical conductor to be the material of the antenna is prepared, and in step (a) it is drilled and turned to form the cavity of the helix forming part 28 and to form the approximate appearance of the antenna. Next, the terminal mounting part is processed by decutting in step (b). In step (c), the through hole 18 is formed by drilling, and in step (d), drilling is also performed to form the lower through hole 22. Finally, the antenna is completed by processing the helix 10 by slotting in step (d).

Such a conventional antenna manufacturing method is simpler than the method of manufacturing an antenna in which the helix is separate from the mounting part, but in the manufacturing method of FIG. 2, in the manufacturing method of FIG. The process is cumbersome because it must go through. In addition, each process is a mechanical process, it is difficult to ensure the uniformity of quality, and the manufacturing cost is high. In addition, since only a material suitable for machining can be used as the material of the antenna, the choice of the material is narrow. In particular, the cutting material contains lead or cadmium, which may cause environmental pollution.

Accordingly, an object of the present invention is to provide an antenna manufacturing method for simplifying and increasing the process and reducing the manufacturing cost in manufacturing an antenna in which the helix and the terminal mounting unit are integrally formed.

In addition, an object of the present invention is to provide a method of manufacturing an antenna which is wider in selection of antenna materials and environmentally friendly while ensuring uniformity of quality.

In order to achieve the above object, the present invention includes an antenna radiator, and a terminal mounting portion for connecting the antenna and the terminal, in the method of manufacturing an antenna for a wireless communication terminal formed integrally with the antenna radiator and the terminal mounting portion, It provides an antenna manufacturing method for a wireless communication terminal comprising the step of forming the antenna radiator and the terminal mounting portion in a single process.

In the forming step, it is preferable to further form a space between the antenna radiator and the terminal mounting portion.

In another preferred embodiment, the forming step further forms a through hole in the lower portion of the antenna radiator.

The single process is preferably one of a die casting process, a sintering process, or a metal powder injection molding process.

Also preferably, the antenna radiator is a helix and the method of manufacturing further comprises removing the flash between each winding of the helix.

The present invention also provides a method for manufacturing an antenna for a wireless communication terminal including a helix, which is an antenna radiator, and a terminal mounting part for connecting an antenna and a terminal, and which is formed integrally with the helix and the terminal mounting part. A method comprising: forming a radiator forming unit having a cavity at a central portion as a part to be processed into the helix, and the terminal mounting unit by a single process; And processing the radiator forming part with the helix.

Preferably, the manufacturing method further comprises the step of forming a through hole in the lower portion of the radiator forming portion.

In addition, the single process is preferably a forging process.

EMBODIMENT OF THE INVENTION Hereinafter, specific embodiment of this invention is described with reference to drawings. In the following description, a method of manufacturing an antenna with respect to a specific type of antenna is described, but it will be readily appreciated by those skilled in the art that the present invention can be applied to various types of antennas without departing from the scope of the present invention. In addition, it is also possible to change the order of each step within the scope of the present invention, which will be obvious to those skilled in the art will be readily appreciated.

4 illustrates an antenna manufacturing method according to an embodiment of the present invention. This embodiment is described in connection with the manufacture of the antenna of FIG. 1C. In this embodiment, a helical antenna is manufactured using diecasting. Die casting is a casting method that injects molten metal into a mold under a pressure above atmospheric pressure. The die casting is suitable for antenna production because of its excellent durability and smooth surface.

First, the molded article is formed by die casting in step (a). In step (a), diecasting is used, which eliminates the need for preparing a cylindrical conductor, unlike conventional methods. In addition, since the helix 10, the through hole 18, the terminal mounting portion 26, and the lower through hole 22 are formed simultaneously by die casting, step (a) in the conventional manufacturing method shown in FIG. To (e) can be replaced by one step. However, due to the nature of die casting, the helical 10 may not be molded into a completed form. In this case, a subsequent process is required, which will be described later.

In step (b), the helix 10 is completed by drilling. In die casting, each part of the mold must not be disconnected in order to allow the molten material to be supplied to the entire mold. Therefore, it is preferable that each winding portion of the helix 10 is formed so as not to be disconnected. In this case, the molded article by die casting in step (a) is shaped so that the helix 10 is connected in a thin layer (ie, flash; 30), and in step (b) the flash 30 is opened by drilling. By elimination, the same helix 10 as in the conventional method can be obtained.

In the case of manufacturing the antenna according to the present embodiment as described above, the process step is significantly reduced (from step 5 to step 2) as compared to the conventional method, and the quality of the molded article is uniform, which greatly reduces the defective rate. Significantly improved efficiency and reduced manufacturing costs. In addition, since the die casting process has a variety of materials that can be used as castings, the mechanical and electrical characteristics of the antenna can be variously adjusted by changing the material. In addition, the material used for die casting has a lower content of cadmium and lead than the material used for machining, thereby establishing an environmentally friendly manufacturing process.

In this embodiment, manufacturing of the molded article of step (a) of FIG. 4 by die casting has been described, but the method used for producing the molded article is not limited to die casting, and various other means can be employed.

For example, it is also possible to manufacture the molded article of step (a) of FIG. 4 by sintering or metal powder injection molding. These methods are a method for producing a molded article from a powdered material, heating it to change the size of the particles to complete the product. In the case of sintering or metal powder injection molding, a molded article having a precise shape can be produced. The application is suitable for the type of production method, and the material selection is very wide. Therefore, the antenna manufacturing process can be made low cost and high efficiency, the characteristics of the antenna can be easily adjusted, and an environmentally friendly manufacturing process can be obtained.

Meanwhile, although the present embodiment has been described with reference to the antenna manufacturing method of FIG. 1C, the manufacturing method of the present embodiment is not limited thereto and may be applied to various types of antennas.

For example, it is possible to apply the method of this embodiment to the antenna of FIG. 1A. In this case, although the post process may be necessary, the antenna of FIG. 1A may be manufactured in a single process by die casting, sintering, or metal powder injection molding. Therefore, since the number of manufacturing processes is significantly reduced compared to the conventional manufacturing method shown in Fig. 2 (step 3 to step 1), the efficiency of the manufacturing process can be achieved, and the same effects as described above can be obtained.

In addition, the method of the present embodiment can be applied to the antenna of FIG.

5 shows an antenna manufacturing method according to another embodiment of the present invention. This embodiment is described in connection with the manufacture of the antenna of FIG. 1C. In this embodiment, a helical antenna is manufactured using forging. Forging is a method in which a metal is deformed and processed in a plastic state, and the structure of the manufactured product is dense and has excellent rigidity and ductility.

According to the embodiment of FIG. 5, a molded article is first produced by forging (step (a)). The molded article is molded to include the helix forming portion 28 and the terminal mounting portion 26, and in particular, a cavity is formed in the center of the helix forming portion 28. As such, by manufacturing the molded article by forging, it is not necessary to prepare a cylindrical conductor, and in the steps (a) and (b) of FIG. 3, the processes of drilling, turning and decutting are performed in a single forging process. Can be replaced.

Next, the through hole 18 is formed by drilling in step (b), and the lower through hole 22 is formed by drilling in step (c). Finally, the antenna is manufactured by slotting the helix forming part 28 in step (d) to form the helix 10.

As such, by manufacturing the antenna using forging, the process performed over the two steps in the prior art of FIG. 3 can be replaced by one process, thereby improving the efficiency of the manufacturing process. In FIG. 3, drilling and turning are shown as being performed in one step, but in practice these processes can be separated, in which case the three steps are replaced by a single step, thus improving the efficiency even more. In addition, since forging is used, a product having excellent rigidity and ductility can be manufactured, and the uniformity of quality can be improved as compared with the conventional method.

Meanwhile, although the present embodiment has been described with reference to the antenna manufacturing method of FIG. 1C, the manufacturing method of the present embodiment is not limited thereto and may be applied to various types of antennas. For example, it is possible to apply the method of this embodiment to the antennas of FIGS. 1A and 1B. In this case, it is possible to manufacture an antenna excellent in rigidity and ductility, and to improve the uniformity of the quality of the antenna.

In the above, embodiments of the present invention have been described in connection with specific forms of antennas. However, the present invention is not limited thereto, and various modifications are possible in the form of the antenna, the order of the process, the material of the antenna, the specific process means used at each step, and the like. It will be easy to recognize.

According to the present invention described above, since the manufacturing process step of the antenna is significantly reduced, the efficiency of the antenna manufacturing process is improved and the manufacturing cost is reduced.

In addition, the quality uniformity of the manufactured antenna is improved, and a wider selection of antenna materials increases the degree of freedom in adjusting the electrical and mechanical properties of the antenna.

In addition, it is possible to use a material with a low content of cadmium and lead to establish an environmentally friendly manufacturing process.

In addition, according to the present invention, an antenna having a high ductility and rigidity and a dense structure can be obtained.

Claims (8)

In the method of manufacturing an antenna for a wireless communication terminal comprising an antenna radiator, and a terminal mounting portion for connecting the antenna and the terminal, the antenna radiator and the terminal mounting portion integrally formed; And forming the antenna radiator and the terminal mounting unit by a single process. The method of claim 1, The forming step further forms a space between the antenna radiator and the terminal mounting portion. The method of claim 1, The forming step further comprises forming a through hole in the lower portion of the antenna radiator. The method according to any one of claims 1 to 3, Wherein said single process is one of a die casting process, a sintering process, or a metal powder injection molding process. The method of claim 4, wherein The antenna radiator is helix, Removing the flash between each of the windings of the helix. In the method of manufacturing an antenna for a wireless communication terminal comprising a helix, an antenna radiator, and a terminal mounting portion for connecting the antenna and the terminal, wherein the helix and the terminal mounting portion are integrally formed. Forming a radiator forming portion having a cavity in a center portion as the portion to be processed into the helix, and the terminal mounting portion by a single process; And And manufacturing the helix from the radiator forming unit. The method of claim 6, And forming a through hole in a lower portion of the radiator forming unit. The method according to claim 6 or 7, Wherein said single process is a forging process.

Images