KR20070076595A - Antenna for portable phones and manufacturing method - Google Patents

Abstract

An antenna for portable phones and a manufacturing method thereof are provided to enhance a bandwidth by a coupling effect through an adjacent convex portion. An antenna for portable phones includes a fixing unit(201), a bobbin(203), a radiant element(204), an upper cap(205), and a cover(202). The fixing unit(201) is made of metal, has a screw thread on an outer surface of the fixing unit(201), and is mounted on the portable phones. The bobbin(203) has at least three or more convex parts and is a dielectric. The radiant element(204) is formed on an outer surface of the bobbin(203), is electrically connected to the fixing unit(201), and transceives a signal. The upper cap(205) is inserted in an upper part of the bobbin(203). The cover(202) is injection-molded in an insert molding method.

Description

Antenna for portable terminal which extends effective length of radiation element and its manufacturing method {Antenna for portable phones and manufacturing method}

1 is a cross-sectional view showing the configuration of a helical antenna according to the prior art.

2 is a cross-sectional view showing a first embodiment of an antenna for a portable terminal in which the effective length of the radiation element according to the present invention is extended.

3 is a view showing the assembled state of FIG.

Figure 4 is a cross-sectional view showing the structure of the radiation element of the antenna for a portable terminal extending the effective length of the radiation element according to the present invention.

5 is a cross-sectional view showing a second embodiment of an antenna for a portable terminal with an effective length of a radiation element according to the present invention.

6 is a cross-sectional view showing a third embodiment of the antenna for a portable terminal with the effective length of the radiation element according to the present invention.

7 is a sectional view showing a fourth embodiment of an antenna for a portable terminal with an effective length of a radiation element according to the present invention.

8 is a cross-sectional view of a bottom-loading stretchable antenna using an antenna for a portable terminal extending the effective length of the radiation element according to the present invention.

9 is a cross-sectional view of the top-loading telescopic antenna using an antenna for a portable terminal extending the effective length of the radiation element according to the present invention.

10 is a measurement showing the voltage standing wave ratio characteristics of the antenna for a portable terminal according to the present invention.

11 is a measurement diagram showing the radiation pattern characteristics of the antenna for a portable terminal according to the present invention.

12 is a view showing a first manufacturing method of an antenna for a portable terminal in which the effective length of the radiation element according to the present invention is extended.

13 is a view showing a second manufacturing method of an antenna for a portable terminal with an effective length of a radiation element according to the present invention.

14 is a view showing a third manufacturing method of an antenna for a portable terminal with an effective length of a radiation element according to the present invention.

<Description of Symbols for Main Parts of Drawings>

100, 200, 310, 410. Helical antenna 101, 201, 311, 401. Fastening means

102. Helical coil 103, 203, 313, 413. Bobbin

104, 202, 312, 412. Cover 105. Bonding section

201-1. Extension 203-1. Convex

204, 314, 414. Radiating element 204-1. Injection part

204-2. Pressed Water 204-3. Masking part

205, 315, 415. Top caps 316, 402. Cylindrical springs

320, 420. Whip Antenna 321, 421. Wire

322, 422. Insulation cover 323, 411. Sleeve

324, 424. Stoppers 325. Handles

423. Insulation

The present invention relates to an antenna for a mobile terminal, and more particularly, the cross-section of the bobbin is made to have at least three convex portions radially, and the radiation element is formed by applying a conductive metal pattern to the bobbin to form a radiation element. The present invention relates to an external antenna for a portable terminal having an extended length to improve electrical performance.

The antenna for a portable terminal according to the prior art is generally an external type protruding to the outside of the terminal to assemble the copy and the cover by a bonding method using an adhesive or the like. 1 is a cross-sectional view illustrating a configuration of an external antenna according to the prior art, and illustrates a fixed antenna having a short physical length by using a helical coil. As shown in the drawing, the fixed antenna 100 typically has a helical coil 102 fitted to the dielectric bobbin 103 and connects metal fixing means 101 connected to a circuit part in the terminal to the lower end thereof by soldering or the like. A cover 104 made of synthetic resin-based material, which is covered with the outer circumferential surface of the means, is bonded by bonding.

However, such antennas have a problem that not only the overall characteristics of the antenna are deteriorated by the influence of the adhesive agent of different materials, but also the appearance is not beautiful and the robustness of the product is also reduced. In addition, by forming a spiral in a bobbin having a circular cross section, its effective length is limited.

In order to improve the problems of the prior art as described above, the present invention, the effective length of the radiation element by applying a conductive metal pattern to the outer peripheral surface of the bobbin made to have at least three convex portions radially to form a radiation element It is an object of the present invention to provide an external antenna for a portable terminal which improves the electrical performance by improving the electrical performance and improves the bandwidth by the coupling effect of adjacent convex portions.

The antenna for a portable terminal according to the present invention includes a metal fixing means 201 mounted on the portable terminal with a screw thread on its outer circumferential surface; and a radiating element 204, which is a spiral conductive metal, is coated on the outer circumferential surface to fix the fixing means. A bobbin 203 of a dielectric material having at least three convex portions 203-1 radially inserted into and fixed in an interference fit manner; and an upper cap fixedly fitted in the upper portion of the bobbin; 205); and a cover 202 which is injection molded by an insert molding technique after a bobbin is fitted to the fixing means and an upper cap is inserted thereon.

In addition, the bottom-loading stretchable antenna for a mobile terminal according to the present invention, the hollow hole in the inside and the outer peripheral surface is provided with a screw thread fixing means 311 to be mounted to the portable terminal; and the inside of the fixing means A cylindrical spring 316 to be assembled; and a radiating element 204, which is a spiral conductive metal, is applied to the outer circumferential surface thereof to be fixedly fitted to the fixing means, and to have at least three convex portions 203 radially in cross section thereof. -1) a bobbin 203 of a dielectric material; and an upper cap 205 fixedly fitted to the upper portion of the bobbin; and an insert after the bobbin is fitted to the fixing means and the upper cap is inserted thereon. The cover 202 is injection molded by a molding technique; and the bobbin is attached to the fixing means such that the radiation element formed on the bobbin is connected to the fixing means by electrical contact or electromagnetic coupling. Helical antenna 310, which is fitted in an interference fit method and the upper cap is fitted in an interference fit method; and a linear wire 321 of a metallic material having elastic force; and an insulating cover 322 which is covered on an outer circumferential surface of the wire And a sleeve formed of a dielectric material on the top of the wire, the sleeve having a larger outer diameter than the insulating cover and being held in close contact with the cylindrical spring in an inserted state; and a handle extended to the sleeve to facilitate extraction. And a stopper 324 coupled to the lower portion of the wire by a clamping method such as a metal material, the outer cover having a larger outer diameter than the insulating cover and being held in close contact with the cylindrical spring in a pulled out state, and the hollow hole of the fixing means. It is movable in the longitudinal direction through the cover, and an insulating cover is covered on its outer circumference, and a handle is provided on the upper part, and a stopper and a arm on the lower part. It is configured to include; member being formed of a linear whip antenna 320, a metal material having elastic force.

In addition, the top-loading stretchable antenna for a portable terminal according to the present invention, the hollow sleeve therein, the metal sleeve 411 is connected to the insulating portion to be described later and in close contact with the cylindrical spring to be described later in the inserted state; A spiral conductive metal radiating element 204 is coated on the outer circumferential surface thereof to be fixed to the fixing means in a sandwiching manner, and the cross section is formed of a dielectric material having at least three convex portions 203-1 radially. Bobbin 203; and the upper cap 205 to be fixed to the upper portion of the bobbin by the interference fit method; and the cover which is injection molded by insert molding technique after the bobbin is fitted to the sleeve and the upper cap is inserted thereon ( And a bobbin fitted to the sleeve in such a manner that the radiating element formed on the bobbin is connected to the sleeve by electrical contact or electromagnetic coupling. Helical antenna 410 assembled by the upper cap is fitted in a force-fit method; and a linear wire 421 of a metallic material having elastic force; and an insulating cover 422 to be covered on the outer peripheral surface of the wire; and through the sleeve An insulating part 423 connected to the insulating cover; A stopper 424 which is coupled to the lower portion of the wire by a clamping method or the like, but has a larger outer diameter than the insulating cover and is in close contact with the cylindrical spring to be described later in the drawing state; and an insulating cover is covered on the lower circumferential surface thereof. A linear whip antenna 420 having a stopper and a cushioning member and having a resilient force; and a metal fixing means 401 mounted on a portable terminal having a hollow hole therein and a screw thread on an outer circumferential surface thereof so as to penetrate the whip antenna; And a cylindrical spring 402 inserted into the fixing means and assembled therein.

In addition, the present invention after the injection of the bobbin 203 in a predetermined shape using a dielectric material of the non-plating material, and then injecting a dielectric of a material that can be plated in the shape of the radiation element 204 back to the bobbin, the bobbin It is characterized in that it is produced by a first manufacturing method for plating a conductive metal on.

In addition, the present invention is produced by a second manufacturing method of injecting the bobbin 203 into a predetermined shape using a dielectric material and inserting the bobbin 203 into a press product 204-2 pressed into the shape of the radiation element 204. It is characterized by.

In addition, the present invention, after the injection of the bobbin 203 to a predetermined shape using a dielectric material of the plating is possible, leaving only the shape of the radiation element 204 in the bobbin again and then masking the rest of the bobbin, It is produced by a third manufacturing method for plating the conductive metal.

Hereinafter, with reference to the accompanying drawings will be described in detail by the preferred embodiment the characteristics and operating principle of each part of the antenna for a portable terminal extending the effective length of the radiation element according to the present invention. In the following description, the same or corresponding members will be denoted by the same reference numerals and detailed description thereof will be omitted.

2 is a cross-sectional view showing a first embodiment of the antenna for a portable terminal with the effective length of the radiation element according to the present invention, Figure 3 is a view showing the assembled state of FIG. As shown, the antenna according to the present invention is provided with a screw thread on its outer circumferential surface, and a fixing means 201 made of metal mounted on a portable terminal, and a radiating element 204, which is a spiral conductive thin metal body, is coated on the outer circumferential surface thereof. The bobbin 203 is made of a dielectric material having at least three convex portions 203-1 radially interposed therebetween, and is fixed to the fixing means in an interference fit manner, and formed on an outer circumferential surface of the bobbin and electrically connected to the fixing means. Spiral-shaped radiating element 204 for contacting or connected by electromagnetic coupling to transmit and receive a signal, an upper cap 205 fixed to the upper part of the bobbin by a force fitting method, and a bobbin to the fixing means It consists of a cover 202 which is injection molded by an insert molding technique after the upper cap is fitted thereon.

As described above, the antenna according to the present invention has the bobbin 203 fitted to the fixing means 201 formed by the cutting process, as described above, and the upper cap 205 to the top thereof. The cover 202 is integrally injection-molded by an insert molding technique, and the fixing means and the radiation element 204 are electrically contacted by the bobbin being fitted in close contact.

In the method of applying the radiation element 204 to the bobbin 203, a conductive paint having a predetermined width and thickness is painted along the outer circumferential surface of the bobbin, or after the entire bobbin is plated, the portion except the spiral shape is scraped off, A spiral groove may be formed in the bobbin and conductive paint may be applied to the groove, or a spiral groove may be formed in the bobbin to completely plate the bobbin, and then any part of the bobbin may be scraped off. . In addition, the bobbin 203 is formed so as to have at least three convex portions 203-1 radially in cross section thereof, and according to the exemplary embodiment of the present invention, the bobbin 203 is disclosed as having four convex portions 203-1. .

The upper cap 205 is a cylindrical body made of a dielectric material and is configured such that a portion having the same diameter as the outer diameter of the bobbin and a portion having the same diameter as the inner diameter of the bobbin are assembled into the bobbin by a fitting method. Such an upper cap may be made of a dielectric material or a conductive metal or a conductive metal coated on the dielectric material according to other embodiments of the present invention described below.

4 is a cross-sectional view showing the structure of an antenna for a portable terminal extending the effective length of the radiation device according to the present invention, Figure 4 (a) shows an antenna according to the prior art and Figure 4 (b) An antenna according to the invention is shown. As shown, the prior art has four convex portions 203- as an embodiment of the present invention, while the length of the radiating element that can be formed along the outer circumferential surface of the bobbin 103 having a circular cross section R is 4 × L1. The bobbin 203 having a radius of 1 and R has a relatively long effective length of 4 x L2 of a radiation element that can be formed along its outer circumferential surface. In addition, the bandwidth can be improved by the coupling effect of the convex portions adjacent to each other.

FIG. 5 is a cross-sectional view showing a second embodiment of an antenna for a portable terminal extending the effective length of a radiation element according to the present invention. The components and the assembly method except for the fixing means 201 are the same as in FIG. . In FIG. 5, the fixing means is further extended upward to be resonated in a relatively high frequency band, and a bobbin in which a radiating element is formed is connected to the fixing means, and its electrical length is extended, thereby resonating in a relatively low frequency band.

6 is a cross-sectional view showing a third embodiment of the antenna for a portable terminal extending the effective length of the radiation element according to the present invention, except that the fixing means 201 and the assembly method is the same as in FIG. . In FIG. 6, the fixing means further includes an extension 201-1 extending upwardly into the bobbin, thereby increasing the capacitive component between the extension and the radiation element, thereby widening the bandwidth of the antenna and radiating efficiency. Will improve.

7 is a cross-sectional view showing a fourth embodiment of the antenna for a portable terminal extending the effective length of the radiation element according to the present invention, all other components and the assembly method except the upper cap 205 is the same as in FIG. . In FIG. 7, the upper cap is formed by applying a conductive metal to a metal material or a dielectric material, and an extension part 205-1 extending further downward is inserted into the bobbin, thereby between the extension part and the radiation element. The capacitive component is increased, which increases the bandwidth of the antenna and improves the radiation efficiency.

8 is a cross-sectional view of a bottom-loading stretchable antenna in which an antenna for a portable terminal which extends the effective length of a radiation element according to the present invention is used. As shown in the lower-loading stretchable antenna according to the present invention, a hollow hole penetrating in the longitudinal direction is formed in the antenna of FIG. 2 (helical antenna 310 according to the reference numeral of FIG. 8), and a whip antenna is formed along the hollow hole. Is configured to be movable up and down. That is, FIG. 8 is a combination of the helical antenna 310 and the whip antenna 320, and any one of the first to fourth embodiments may be used for the helical antenna 310.

The helical antenna 310 is a bobbin 313 is fitted to the fixing means 311 by the interference fitting method, and the upper cap 315 is fitted into the upper assembly by the interference fitting method, and is formed by a cutting process or the like. It has a hollow hole therein, the outer peripheral surface is provided with a screw thread fixing means 311 to be mounted to the portable terminal, the cylindrical spring 316 is fitted into the assembly of the fixing means, and the radiating element is a conductive metal on the outer peripheral surface 314 is applied and secured to the fixing means by clamping, the cross section having a radial bobbin 313 having at least three convex portions 203-1 radially connected to the fixed water end. A conductive radiation element 314 formed on an outer circumferential surface of the bobbin to transmit and receive a signal, an upper cap 315 fixedly fitted to the upper portion of the bobbin by a force fitting method, and a bobbin fitted to the fixing means. After the top cap fitted thereon is composed of a cover 312 that is injection-molded by an insert molding technique.

In addition, the whip antenna 320 is movable in the longitudinal direction through the hollow hole of the fixing means, the outer cover is covered with an insulating cover, the upper portion is provided with a handle, the lower stopper and the buffer member is formed, the elastic force A linear wire 321 which is a metal material, an insulating cover 322 which is covered on the outer circumferential surface of the wire, and a dielectric material formed on an upper portion of the wire, but having an outer diameter larger than that of the insulating cover and being inserted into the cylindrical spring. A tightly supported sleeve 323, a handle 325 extending to the sleeve to facilitate withdrawal, and a metal material are coupled to the lower portion of the wire by clamping or the like, but have a larger outer diameter than the insulating cover. It consists of a stopper 324 in close contact with the cylindrical spring in a state.

9 is a cross-sectional view of the top-loading stretchable antenna in which an antenna for a portable terminal which extends the effective length of the radiation element according to the present invention is used. As shown, the top-loading stretchable antenna according to the present invention has a whip antenna connected to the lower portion of the antenna of FIG. 2 (helical antenna 410 according to the reference numeral of FIG. 9). That is, FIG. 9 is a combination of the helical antenna 410 and the whip antenna 420, and any one of the first to fourth embodiments may be used for the helical antenna 410.

The helical antenna 410 is a bobbin 413 is fitted to the sleeve 411 in the interference fit method and the upper cap 415 is fitted in the interference fit method on the upper, it is formed by a cutting process or the like A radiating element 414, which is a conductive metal, is applied to an outer circumferential surface and fixedly fitted to the fixing means in a clamping manner, the cross section having a bobbin 413 made of a dielectric material having at least three convex portions 203-1 radially; A conductive radiation element 414 formed on an outer circumferential surface of the bobbin to be connected to the sleeve to transmit and receive a signal, an upper cap 415 fixed to the upper portion of the bobbin by an interference fit method, and an insulating portion passing through the sleeve ( 423 is fitted, and a bobbin is fitted to the sleeve, and an upper cap is fitted thereon, and then the cover 412 is injection molded by insert molding technique.

In addition, the whip antenna 420 is connected to the insulating portion, the outer peripheral surface is covered with an insulating cover, the bottom is formed with a stopper and a buffer member, a linear wire 421 of a metallic material having an elastic force and the outer peripheral surface of the wire Insulation cover 422 which is covered on, the insulating portion 423 is formed of a dielectric material on the upper portion of the wire and connected through the sleeve, and is coupled to the lower portion of the wire by a clamping method, such as a metal material and the insulation The stopper 324 has an outer diameter larger than that of the cover.

The upper loading stretchable antenna as described above has a hollow hole therein so that the whip antenna penetrates, and a screw thread is provided on the outer circumferential surface thereof, and the metal fixing means 401 mounted to the portable terminal is fitted into the fixing means. A cylindrical spring 402 is further provided, wherein the sleeve 411 is in close contact with the cylindrical spring in the inserted state and the stopper 424 is in close contact with the cylindrical spring in the pulled out state.

Along with the second to fourth embodiments disclosed in FIGS. 5 to 9, the lower loading stretchable antenna and the upper loading stretchable antenna, the antenna according to the present invention has a relatively high extension of the fixing means. Since the resonant frequency and the sum of the fixing means and the radiation element resonate at a relatively low frequency, the resonance is basically resonated in a dual band as shown in FIG. 10 to be described later.

Further, in the first to fourth embodiments of the present invention, the lower loading stretchable antenna and the upper loading stretchable antenna, the antenna according to the present invention has a radiation element formed on the bobbin in electrical contact with the fixing means or It can be formed to be connected by electromagnetic coupling. As such, the fixing means and the radiating element are connected by electromagnetic coupling to increase the capacitive component between the fixing means and the radiating element, thereby widening the bandwidth of the antenna and improving the radiation efficiency.

10 and 11 are measurement diagrams showing the electrical characteristics of the antenna for a portable terminal according to the present invention, respectively, showing voltage standing wave ratios and radiation pattern characteristics. As shown in FIG. 10, the antenna according to the present invention is resonated in a DCS band of 1.9 GHz, which is a relatively high frequency by the fixing means 201, and relatively low by the fixing means 201 and the radiation element 204. It can be seen that the frequency is resonant in the mobile telephone band of 800MHz band.

12 is a view showing a first manufacturing method of an antenna for a portable terminal in which the effective length of the radiation element according to the present invention is extended. First, the bobbin 203 is injected into a predetermined shape by using a non-plating dielectric, and a non-plating dielectric such as urethane or polycarbonate (PC) is molded into a predetermined shape, but the outer peripheral surface thereof is Alternatively, the shape of the radiation element on the upper portion is formed in an embossed or intaglio. This process may be used in addition to injection molding methods such as cutting.

Next, a dielectric of a material that can be plated in the shape of the radiation element 204 is again injected into the bobbin. An injection portion 204 is formed by inserting a plateable dielectric into the shape of the radiation element into the molded non-plating material. In the embodiment of the present invention, as forming -1), an ABS for plating was used in which a copolymer of acrylonitrile and butadiene and a copolymer of styrene and butadiene were mixed.

Subsequently, the conductive metal is plated on the bobbin in which the injection part is formed of the plating dielectric, and gold, silver or copper having excellent conductivity may be used, but is not limited thereto. In addition to the method of plating the conductive metal, a technique by insert injection or deposition may be used.

13 is a view showing a second manufacturing method of an antenna for a portable terminal with an effective length of a radiation element according to the present invention. The second manufacturing method is a method of injecting the bobbin 203 into a predetermined shape using a dielectric material and inserting the bobbin 203 into a press product 204-2 that is pressed into the shape of the radiation element 204. As described above, water, gold, silver, or copper having excellent conductivity may be used.

14 is a view showing a third manufacturing method of an antenna for a portable terminal with an effective length of a radiation element according to the present invention. First, the bobbin 203 may be formed by using a plating material in which a dielectric material of a plateable material, for example, a copolymer of acrylonitrile and butadiene and a copolymer of styrene and butadiene are mixed. After the injection into a predetermined shape masking the remaining portion leaving only the shape of the radiation element 204 in the bobbin, and then plate the conductive metal on the bobbin. The plating method and material are the same as in the first manufacturing method.

The present invention as described above is not limited to the above-described embodiment, and may be variously modified and implemented by those skilled in the art without departing from the technical gist of the present invention.

As described above, the present invention, in the antenna fixed to the portable terminal for transmitting and receiving a signal, the radiation element is formed by applying a conductive metal pattern on the outer peripheral surface of the bobbin made so that its cross section has at least three convex portions radially As a result, the effective length of the radiation element can be extended to improve the electrical performance, and the bandwidth can be improved by the coupling effect of adjacent convex portions.

Claims (18)

In the antenna for a mobile terminal for transmitting and receiving a radio signal, A metal fixing means provided on the outer circumferential surface thereof and mounted to the portable terminal; A bobbin made of a dielectric material having a radiating element, which is a conductive metal, coated on the outer circumferential surface thereof to be fixed to the fixing means in a sandwiched manner, the cross section having at least three convex portions radially; An upper cap fixed to the upper portion of the bobbin by being fitted in an interference fit manner; And And a cover that is injection-molded by an insert molding technique after a bobbin is fitted to the fixing means and an upper cap is inserted thereon, wherein the effective length of the radiation element is extended. In the antenna for a mobile terminal for transmitting and receiving a radio signal, A screw fixing member provided on the outer circumferential surface thereof and mounted to the portable terminal, the metal fixing means having an upper portion formed thereon; A bobbin made of a dielectric material having a radiating element, which is a conductive metal, coated on the outer circumferential surface thereof to be fixed to the fixing means in a sandwiched manner, the cross section having at least three convex portions radially; An upper cap fixed to the upper portion of the bobbin by being fitted in an interference fit manner; And And a cover which is injection-molded by an insert molding technique after a bobbin is fitted to the fixing means and an upper cap is inserted thereon, wherein the effective length of the radiation element is extended. In the antenna for a mobile terminal for transmitting and receiving a radio signal, A screw fixing member provided on the outer circumferential surface thereof, the fixing member being mounted to the portable terminal and having an extension formed thereon inserted into the bobbin; A bobbin made of a dielectric material having a radiating element, which is a conductive metal, coated on the outer circumferential surface thereof to be fixed to the fixing means in a sandwiched manner, the cross section having at least three convex portions radially; An upper cap fixed to the upper portion of the bobbin by being fitted in an interference fit manner; And And a cover that is injection-molded by an insert molding technique after a bobbin is fitted to the fixing means and an upper cap is inserted thereon, wherein the effective length of the radiation element is extended. In the antenna for a mobile terminal for transmitting and receiving a radio signal, A metal fixing means provided on the outer circumferential surface thereof and mounted to the portable terminal; A bobbin made of a dielectric material having a radiating element, which is a conductive metal, coated on the outer circumferential surface thereof to be fixed to the fixing means in a sandwiched manner, the cross section having at least three convex portions radially; An upper cap inserted into the upper part of the bobbin by a force fitting method, the lower part of which is extended to be inserted into the bobbin; And And a cover that is injection-molded by an insert molding technique after a bobbin is fitted to the fixing means and an upper cap is inserted thereon, wherein the effective length of the radiation element is extended. In the flexible antenna for a mobile terminal for transmitting and receiving a radio signal, Metal fixing means for having a hollow hole therein and the outer peripheral surface is provided with a screw thread mounted to the portable terminal; A cylindrical spring fitted into the fixing means and assembled; A bobbin made of a dielectric material having a radiating element, which is a conductive metal, coated on the outer circumferential surface thereof to be fixed to the fixing means in a sandwiched manner, the cross section having at least three convex portions radially; An upper cap fixed to the upper portion of the bobbin by being fitted in an interference fit manner; A cover which is injection molded by an insert molding technique after a bobbin is fitted to the fixing means and an upper cap is inserted thereon; A helical antenna having a bobbin fitted to the fixing means in an interference fit manner, and an upper cap fitted to the fixing means in an interference fit manner; Linear wire made of a metallic material having elastic force; An insulation cover covering the outer circumferential surface of the wire; A sleeve formed of a dielectric material on top of the wire, the sleeve having an outer diameter larger than that of the insulating cover and being in close contact with the cylindrical spring in an inserted state; A handle extending from the sleeve to facilitate extraction; A stopper coupled to the lower portion of the wire by a metal material, for example, by a clamping method, the stopper having a larger outer diameter than the insulating cover and being in close contact with the cylindrical spring in a pulled out state; And A linear whip antenna which is movable in the longitudinal direction through the hollow hole of the fixing means and covered with an insulating cover on the outer circumferential surface thereof, having a handle on the upper side thereof, and a stopper and a buffer member formed on the lower side thereof, and having an elastic force; A bottom loading telescopic antenna for a portable terminal, which extends the effective length of the radiating element. In the flexible antenna for a mobile terminal for transmitting and receiving a radio signal, A metal sleeve which has a hollow hole therein and is connected to an insulating part to be described later but is in close contact with the cylindrical spring in an inserted state; A bobbin made of a dielectric material having a spiral conductive metal applied to the outer circumferential surface thereof to be fixed to the fixing means by being fitted in an interference fit manner, the cross section having at least three convex portions radially; An upper cap fixed to the upper portion of the bobbin by being fitted in an interference fit manner; A cover which is injection molded by an insert molding technique after a bobbin is fitted in the sleeve and an upper cap is inserted therein; A helical antenna having a bobbin fitted to the sleeve by an interference fit method and an upper cap fitted on the sleeve so that a radiation element formed on the bobbin is connected to the sleeve by electrical contact or electromagnetic coupling; Linear wire made of a metallic material having elastic force; An insulation cover covering the outer circumferential surface of the wire; An insulation part inserted through the sleeve and connected to the insulation cover; A stopper coupled to a lower portion of the wire by a metal material such as a clamping method, the stopper having a larger outer diameter than the insulating cover and being in close contact with a cylindrical spring to be described later in the drawing state; A linear whip antenna having an insulating cover on an outer circumferential surface thereof and having a stopper and a buffer member formed thereon and having elasticity; Metal fixing means for having a hollow hole therein so that the whip antenna is penetrated and a screw thread is provided on the outer circumferential surface and mounted to the portable terminal; And And a cylindrical spring inserted into the fixing means and assembled therein. The upper loading stretchable antenna for a portable terminal which extends the effective length of the radiation element. The bobbin according to any one of claims 1 to 6, wherein An antenna for a portable terminal having an effective length of a radiating element, wherein a radiating element having a radial cross section having at least three or more convex portions and having a conductive metal applied to an outer circumferential surface thereof to extend an effective length thereof. The bobbin according to any one of claims 1 to 6, wherein An antenna for a portable terminal, in which the effective length of a radiation element is extended, wherein the bandwidth and gain of the antenna are improved by a coupling effect between convex portions adjacent to each other. The method according to any one of claims 1 to 6, And the fixing means and the radiating element are connected by electrical contact. The method according to any one of claims 1 to 6, And the fixing means and the radiating element are connected by an electromagnetic coupling to extend the effective length of the radiating element. The antenna of any one of claims 1 to 6, wherein the antenna An antenna for a portable terminal with an effective length of a radiation element characterized in that the resonance is at least two or more frequencies. In the method for manufacturing an antenna for a mobile terminal, After the injection of the bobbin into a predetermined shape using a dielectric material of the non-plating material, and then injecting a dielectric of a material that can be plated in the shape of the radiation element to the bobbin again, and then plate the conductive metal on the bobbin Method of manufacturing an antenna for a terminal. The dielectric material of claim 12, wherein the dielectric of the non-plating material is A method of manufacturing an antenna for a portable terminal, characterized in that the urethane series synthetic resin. The dielectric material of claim 12, wherein the dielectric of the non-plating material is A method for manufacturing an antenna for a portable terminal, characterized in that the polycarbonate-based synthetic resin. In the method for manufacturing an antenna for a mobile terminal, After the injection of the bobbin into a predetermined shape using a dielectric material of the plating material, and then leaving only the shape of the radiation element in the bobbin again and masking the remaining portion, the portable terminal characterized in that the conductive metal is plated on the bobbin Method of manufacturing an antenna for use. The method according to claim 12 or 15, wherein the plating dielectric, A method of manufacturing an antenna for a portable terminal, characterized in that the ABS-based synthetic resin for plating. The method of claim 12 or 15, wherein the conductive metal film, A method for manufacturing an antenna for a portable terminal, characterized in that it is any one of a highly conductive metal group consisting of gold, silver, and copper. In the method for manufacturing an antenna for a mobile terminal, And injecting the bobbin into a predetermined shape using a dielectric, and inserting the bobbin into a press formed into a shape of a radiation element.

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