WO2011031070A2

WO2011031070A2 - Retractable antenna capable of reducing the occupied space and cost

Info

Publication number: WO2011031070A2
Application number: PCT/KR2010/006132
Authority: WO
Inventors: 김시열
Original assignee: Kim Sie Yul
Priority date: 2009-09-11
Filing date: 2010-09-09
Publication date: 2011-03-17
Also published as: KR200454127Y1; WO2011031070A3; KR20110002723U

Abstract

The present invention relates to a retractable antenna capable of reducing the occupied space and cost. In particular, the retractable antenna comprises: a rod antenna portion with a linear form, which is freely retractable in the longitudinal direction of a mobile wireless communication terminal; and a connection member which is connected to the antenna portion to be able to move inside thereof and serves to mount the antenna portion to a terminal body, wherein the connection member includes a plurality of convex portions protruded inwardly to come in contact with the rod antenna portion, and a base to be interposed between the convex portions, the base having a circular ring that is cut in such a manner as to make the convex portions pressurize the road antenna portion to elastically deform, dual plates extended respectively from both ends of the ring, and coupling holes for receiving screws to fasten the base to the terminal body. Here, the ring and the base are formed by bending one plate, and the dual-layer base is coupled by rivet fastening or spot welding to limit the radial expansion of the ring.

Description

Flexible antenna for reduced space and cost

The present invention relates to an expandable antenna capable of reducing space and reducing costs, and more particularly, by manufacturing a connecting member only by cutting and bending a plate, in comparison with a connecting member conventionally manufactured with a mold, improved performance. The present invention relates to a telescopic antenna capable of reducing space and reducing cost.

The mobile wireless communication terminal is essentially equipped with an antenna for receiving radio waves. Such an antenna may be formed in various forms. The antenna may be classified into an internal type and an external type, and may be divided into an external type and a single rod.

All of these antennas must be coupled to the body of the terminal and electrically connected to the body for signal transmission. Therefore, the antennas are composed of an antenna unit for direct reception of radio waves and a connecting member for mounting the antenna unit to the terminal body.

1 and 2 illustrate a dual expandable multi-stage antenna as an example, the antenna is formed in a straight line shape in a mobile wireless communication terminal, the rod antenna unit 1 freely stretchable in the longitudinal direction, and the rod antenna unit 1 ) Is connected to the rod antenna unit 1 so as to be movable inward, and comprises a connecting member 2 for mounting the rod antenna unit 1 to the terminal body.

And the connecting member 2 is composed of a main body portion 3, a leaf spring 6 and a pressure ring (7) as shown in the partial cutaway perspective view shown in FIG.

The main body portion 3 again consists of a base portion 4 and a ring portion 5. At this time, the base portion 4 and the ring portion 5 is integrally manufactured by a mold. The base portion 4 is provided with a coupling hole 4a for screwing into the terminal body, and the ring portion 5 is provided with a protrusion 5a protruding from one end to the inside.

The leaf spring 6 is inserted into the inner circumference of the ring portion 5 to press the rod antenna portion 1, and toward the one end of the ring portion 5 in which the protruding portion 5a is formed. It is inserted at the other end.

In addition, the pressing ring 7 is forcibly pressed into the other end of the ring portion 5 to prevent the separation of the leaf spring (6).

However, such a conventional antenna has the following problems.

That is, the connection member 2 generally has a different form depending on the type of the terminal. Therefore, in the antenna manufacturer, it is essential to manufacture the connection member 2 in order to manufacture an antenna to be mounted in a new terminal. However, since the connecting member 2 is manufactured in a mold for mass production and robustness, there is a problem that the antenna manufacturer has to separately manufacture a mold for the connecting member for each new antenna.

In addition, the connection member 2 manufactured by the die production requires post-processing such as polishing and plating operations on the outer surface due to the characteristics of the die production. Therefore, additional time and cost are required for post-treatment such as polishing and plating operations to produce one connecting member.

And the ring part 5 of the connection member manufactured by the metal mold | die has the rod antenna part 1 slide-inward in order to support the leaf | plate spring 6 which presses the said rod antenna part 1, and also with respect to the metal mold | die It must have a certain thickness in order to manufacture the ring part of the connecting member by injection. Therefore, the conventional ring portion 5 is a barrier to miniaturization of the terminal as the space occupied in the terminal increases due to its thickness.

Therefore, the present invention has been made to solve the conventional problems as described above, an object of the present invention is a telescopic antenna that can reduce the space and cost can be easily produced by connecting and cutting the plate easily without the production of molds It is to provide.

Another object of the present invention is to provide a stretchable antenna capable of reducing the space and cost can reduce the size of the connecting member by manufacturing a connecting member by processing a thin plate.

According to a feature of the present invention for achieving the object as described above, the present invention relates to a telescopic antenna capable of reducing the space and cost, the rod is formed in a straight form in the mobile wireless communication terminal freely stretchable in the longitudinal direction A stretchable antenna comprising an antenna unit and a connecting member connected to the antenna unit so as to be movable inward, and mounting the antenna unit to the terminal main body, wherein the connecting member is convexly protruded inward and the A plurality of convex portions in contact with the rod antenna portion, between the convex portions, a circular ring portion in which the convex portions are cut so as to elastically deform while pressing the rod antenna portion, and a plate material extending from both ends of the ring portion, respectively; Overlapping with each other and fastened by screws to the terminal body The base portion is provided with a coupling hole which can be formed, wherein the ring portion and the base portion is formed by bending a single plate, the two-ply base portion is coupled by rivet fastening or spot welding to limit the radial expansion of the ring portion It features.

At this time, it is mounted to the outer periphery of the convex portion to support the convex portion, C-shaped pressing ring is partially cut to avoid interference with the base portion; may further include a.

On the other hand, according to the present invention, the telescopic antenna capable of reducing the space and reducing the cost is formed in a straight line shape in a mobile wireless communication terminal, and is freely stretchable in the longitudinal direction, and the antenna unit is movable in the antenna unit. A stretchable antenna including a connecting member connected to the antenna unit and mounted to the terminal body, wherein the connecting member is formed by bending a plate to have a circular ring portion and a base portion connected to the ring portion. A part of the portion is cut off, the base portion main body portion is provided with a coupling hole that can be fastened to the terminal body by a screw; A cylindrical leaf spring inserted into an inner circumference of the ring portion to press the rod antenna passing through the ring portion; And press the ring portion from the outside to reduce the diameter of the ring portion through the cut portion of the ring portion and to be mounted on an outer circumference of the ring portion to maintain the ring portion holding the leaf spring. It may be configured to include; C-type pressing ring, a part of which is cut to avoid the interference.

Here, the base portion, the plate material may be formed by overlapping in two layers at the end of the base portion.

In addition, the base portion, the plate material is formed by overlapping in two layers in the state cut off at the end of the base portion, the two layers of plate material may be bound to each other by rivet fastening or by spot welding.

In addition, the interruption of the ring portion, the recess of the ring portion relative to the top and bottom recessed space so as to prevent the separation of the leaf spring and the pressure ring to the top or bottom of the ring portion concave at the outer periphery of the leaf spring And a first bent portion bent inward to correspond to the shape of the pressure ring.

In this case, an embossed portion protruding toward the leaf spring may be formed in the first bent portion of the ring portion to support the leaf spring and increase rigidity of the ring portion.

According to the flexible antenna which can reduce the space and reduce the cost according to the present invention, the connecting member can be easily manufactured by only cutting and bending the sheet without fabricating a mold, and thus, the total antenna manufacturing cost is not required by manufacturing a separate mold for each terminal model. There is an advantage that can be significantly reduced.

In addition, according to the present invention, by manufacturing a connection member by processing a thin plate can reduce the size of the connection member there is an effect that can utilize the internal space of the terminal more widely or further reduce the size of the terminal.

1 is a perspective view showing the configuration of an antenna according to the prior art,

FIG. 2 is a partially cutaway perspective view of a connecting member of the antenna shown in FIG. 1;

3 is a perspective view showing a first embodiment according to the present invention;

4 is a perspective view illustrating a connection member according to a first embodiment;

5 is a perspective view showing a modified example of the connection member according to the first embodiment,

6 is a perspective view showing a second embodiment according to the present invention;

7 is a cross-sectional view taken along line AA ′ of FIG. 6;

8 is a perspective view of the coupling member according to the second embodiment;

9 is a perspective view showing a connecting member of a third embodiment according to the present invention;

10 is a perspective view of the coupling member according to the third embodiment;

11 is a perspective view showing a connecting member of a fourth embodiment according to the present invention;

12 is a perspective view showing a connecting member of a fifth embodiment according to the present invention;

13 is a perspective view showing a connecting member of a sixth embodiment according to the present invention;

14 is a cross-sectional view taken along line BB ′ of FIG. 13.

Hereinafter, with reference to the accompanying drawings, a flexible antenna capable of reducing space and reducing costs according to the present invention will be described.

Hereinafter, a first embodiment of a telescopic antenna capable of space reduction and cost reduction according to the present invention will be described.

3 is a perspective view showing a first embodiment according to the present invention, Figure 4 is a perspective view showing a connecting member according to the first embodiment.

As shown, the telescopic antenna capable of reducing the space and reducing the cost according to the present invention is largely composed of a rod antenna unit 10 and a connecting member 20.

The rod antenna unit 10 is formed in a straight line shape in the mobile wireless communication terminal and is freely stretchable in the longitudinal direction, and is configured in the same form as described in the related art.

The connecting member 20 is connected to the rod antenna unit 10 so that the rod antenna unit 10 can move inside. That is, the rod antenna unit 10 is slidably mounted in the connection member 20. The connecting member 20 is configured to mount the rod antenna unit 10 to the terminal body so that the entire antenna according to the present invention is extended to the outside of the terminal or contracted inside the terminal.

Referring to the connection member 20 in more detail, the connection member 20 is composed of a base portion 21 and a ring portion 22. The ring portion 22 and the base portion 21 are formed by bending one plate.

The ring portion 22 includes a plurality of convex portions 22a that protrude convexly inward to contact the rod antenna portion. At this time, between the convex portions 22a, as shown in FIG. 4, the convex portions 22a are cut to elastically deform while pressing the rod antenna portion 10.

In addition, the base portion 21 is formed by overlapping two layers of plates extending from both ends of the ring portion 22, respectively. That is, the ring portion 22 and the base portion 21, as mentioned above, consists of a single plate, the ring portion 22 is located in the middle portion of the plate, and both ends of the base portion ( 21) is located. Accordingly, the base portion 21 is formed of two layers of plate material extending from the ring portion 22.

In addition, the base portion 21 is provided with a coupling hole 21a to couple the connecting member 20 to the terminal body by screws.

In addition, before the base portion 21 is coupled to the terminal body, the base portion 21 restricts radial expansion of the ring portion 22 so that the rod antenna portion 10 is attached to the ring portion 22. It is possible to combine the base portion 21 consisting of two layers to be mounted. At this time, a variety of means can be used as the coupling method of the base portion 21, in general, rivet fastening or spot welding through the fastening hole (21b) can be used.

Meanwhile, as illustrated in FIG. 5, a pressure ring 23 may be further added to the connection member 20. The pressing ring 23 is mounted on the outer periphery of the convex portion of the ring portion 22 and serves to support the convex portion 22a from the outside. The pressing ring 23 is made of a C shape, to avoid interference with the base portion 21 when fastened to the ring portion 22.

As described above, according to the present invention, when the telescopic antenna capable of reducing the space and reducing the cost is configured, the plate member is cut without bending the ring portion and the base portion of the connecting member 20 without a mold and bent to have the shape as described above. I can make it. At this time, the diameter of the plate is not particularly limited, but may be composed of approximately 0.2 ~ 0.3mm, it is sufficient, not only can reduce the size of the connecting member 20, but also the thickness of the ring portion 22 is the same size as that produced by the mold Since it is reduced, the inner space of the ring portion 22 can also be utilized more widely.

In addition, it is necessary to cut and bend the already manufactured plate, so that no special post-treatment is required for the plate. Therefore, it is possible to reduce the time and cost required for post-processing such as polishing and plating on the appearance of the connection member 20 in the conventional mold manufacturing.

In addition, according to the present embodiment, since the convex portion serving as the leaf spring is provided in the ring portion 22 itself, it is not necessary to install a separate leaf spring, and also does not need a configuration for preventing the leaf spring from being separated. do. The antenna is finished by simply inserting the rod antenna part into the ring part and coupling the base part connected to the ring part by rivet fastening or spot welding. Therefore, not only the number of parts can be drastically reduced, but also the number of work can be significantly reduced, so that it is easy to produce prototypes at the planning stage of the antenna, and it can be produced at a lower cost even in a mass production system.

In addition, when a large force is applied to the convex portion of the ring portion, for example, in the antenna of the terminal used in an environment where there is a lot of shaking or impact (for example, inside an automobile), the pressing ring is inserted into the outer circumference of the convex portion. The pressing ring supports the convex portion so that the rod antenna portion can be stably pressed even when the convex portion receives a larger force.

Second Embodiment

Next, a second embodiment of a telescopic antenna capable of space reduction and cost reduction according to the present invention will be described. In the present embodiment, the same reference numerals as those in the first embodiment will be used for the components corresponding to the first embodiment.

6 is a perspective view showing a second embodiment according to the present invention, Figure 7 is a cross-sectional view taken along the line AA 'of Figure 6, Figure 8 is a perspective view of the coupling member according to the second embodiment.

As shown, the connection member 20 in this embodiment is composed of a main body portion 25, a leaf spring 28 and the pressure ring 29.

The body portion 25 is formed by bending a plate member to have a circular ring portion 27 and a base portion 26 connected to the ring portion 27. That is, since the ring part 27 and the base part 26 are formed by bending one board | plate material, it is comprised integrally. And a part of the ring portion 27 is cut so that the diameter of the ring portion 27 can be expanded and contracted by the pressure from the outside. Therefore, when the leaf spring 28 is inserted into the inner circumference of the ring portion 27, the diameter of the ring portion 27 may be expanded, and when the ring portion 27 presses the inserted leaf spring 28, the pressure is applied. The diameter of the ring portion 27 can be reduced by the ring 29.

Here, when the ring portion 27 is bent, a first bent portion 27a which is recessed inward relative to the upper end or the lower end of the ring portion 27 is formed at the middle of the ring portion 27. This is to prevent the pressing ring 29 which is fitted to press the interruption portion of the ring portion 27 from the outside to the top or bottom of the ring portion 27. Therefore, the recessed depth and width of the first bent portion 27a are configured to correspond to the shape of the pressing ring 29.

Further, when the leaf spring, which will be described below, has the convex portion in which the leaf spring is convex, the first bent portion is inserted into the rear end of the convex portion, that is, the outer circumference of the leaf spring, so that the leaf spring is at the top or the bottom of the ring portion. To prevent departure.

In addition, the base portion 26 of the main body portion 25 is provided with a coupling hole 26a to which the connection member 20 can be fastened by a screw to the terminal body.

On the other hand, the leaf spring 28 is inserted into the inner circumference of the ring portion 27 to press the rod antenna portion 10 that slides through the ring portion 27, and is made of a cylindrical shape. The leaf spring 28 is in contact with the outer periphery of the rod antenna 10, the rod antenna 10 is capable of sliding movement, but the state is stopped by the pressing force of the leaf spring 28 in a state where the movement is stopped. To maintain. Accordingly, the leaf spring 28 is not particularly limited in shape and material as long as the leaf spring 28 can be contacted while exerting a set pressure force on the rod antenna. However, in the present embodiment, the leaf spring 28 is convex inwardly. Examples are made of metal materials.

The leaf spring 28 shown in the present embodiment includes a convex portion 27a which is convex inward, and the convex portions are cut in such a manner that the convex portions are elastically deformed while pressing the rod antenna portion.

Meanwhile, the pressure ring 29 presses the ring portion 27 from the outside of the ring portion 27 so that the diameter of the ring portion 27 is reduced so that the ring portion 27 grips the leaf spring 28. It is mounted on the outer circumference of the ring portion 27, that is, the first bent portion 27a to maintain the state. In addition, the pressing ring 29 is configured in a C shape, a part of which is cut to avoid interference with the base portion 26 when fitted to the ring portion 27.

As described above, according to the present invention, since the telescopic antenna capable of reducing the space and reducing the cost is configured, the plate member may be cut without forming the main body portion 25 of the connecting member 20 in a mold and may have the shape as described above. It can be produced by bending. At this time, the diameter of the plate material is not particularly limited, but may be composed of approximately 0.2 ~ 0.3mm, so that not only can reduce the size of the main body portion 25, but also if the thickness of the ring portion 27 is the same size as that produced by the mold Since it is reduced, the inner space of the ring portion 27 can be utilized more widely.

In addition, according to the present embodiment, since the ring portion 27 is formed to be expandable and contractible, not only the leaf spring 28 is easily inserted into the ring portion 27 but also the leaf spring 28 is inserted. The connection member 20 can be easily manufactured by simply fastening the pressure ring 29 to the furnace ring part 27. Therefore, it is not only easy to produce prototypes at the planning stage of the antenna, but also can be produced at lower cost in mass production systems.

Third Embodiment

Next, a third embodiment of the telescopic antenna capable of space reduction and cost reduction according to the present invention will be described. In the present embodiment, the same reference numerals as those in the second embodiment will be used for the components corresponding to the second embodiment.

9 is a perspective view showing a connection member of a third embodiment according to the present invention, Figure 10 is a perspective view of the coupling member of the connection member according to the third embodiment. In FIG. 9, the illustration of the leaf spring is omitted to show the inner circumferential shape of the ring portion.

As shown, in the present embodiment, the base portion 26 is composed of two layers of plate material. To this end, the plates are bent at the ends of the base portion 26 and overlap each other. Thereby, the ring part 27 is comprised by bending so that the two-ply board | plate material which comprises the base part 26 may form one circle | round | yen. At this time, the part facing the two-ply sheet material is naturally cut form, spaced apart from each other by a certain distance so that the diameter of the ring portion 27 can be reduced.

Since other configurations are the same as those in the second embodiment, detailed description thereof will be omitted.

Fourth Embodiment

Next, a fourth embodiment of the telescopic antenna capable of space reduction and cost reduction according to the present invention will be described. In the present embodiment, the same reference numerals as those in the second embodiment will be used for the components corresponding to the second embodiment.

11 is a perspective view showing a connecting member of a fourth embodiment according to the present invention. In FIG. 11, the illustration of the leaf spring is omitted to show the inner circumferential shape of the ring portion.

As shown, in the present embodiment, as in the second embodiment, the base portion 26 is composed of two layers of plate material. To this end, the plate material is formed by overlapping in two layers in a cut state at the end of the base portion 26, the overlapping two layers of the plate material is bound to each other by the rivets (30). And the ring part 27 is comprised by bending so that the two-ply board | plate material which comprises the base part 26 may form one circle | round | yen. At this time, the part facing the two-ply sheet material is naturally cut form, spaced apart from each other by a certain distance so that the diameter of the ring portion 27 can be reduced.

Fifth Embodiment

Next, a fifth embodiment of the telescopic antenna capable of space reduction and cost reduction according to the present invention will be described. In the present embodiment, the same reference numerals as those in the second embodiment will be used for the components corresponding to the second embodiment.

12 is a perspective view showing a connecting member of a fifth embodiment according to the present invention. 12, the illustration of the leaf spring is omitted to show the inner circumferential shape of the ring portion.

As shown, in the present embodiment, as in the third and fourth embodiments, the base portion 26 is composed of two layers of plate material. To this end, the plate is formed by overlapping in two layers in a state cut off at the end of the base portion 26, the overlapping two layers of the plate is bound to each other by the spot welding (40). And the ring part 27 is comprised by bending so that the two-ply board | plate material which comprises the base part 26 may form one circle | round | yen. At this time, the part facing the two-ply sheet material is naturally cut form, spaced apart from each other by a certain distance so that the diameter of the ring portion 27 can be reduced.

Sixth Embodiment

Next, a sixth embodiment of a telescopic antenna capable of space reduction and cost reduction according to the present invention will be described. In the present embodiment, the same reference numerals as those in the second embodiment will be used for the components corresponding to the second embodiment.

FIG. 13 is a perspective view illustrating a connection member of a sixth embodiment according to the present invention, and FIG. 14 is a cross-sectional view taken along line BB ′ of FIG. 13. In FIG. 13, the illustration of the leaf spring is omitted to show the inner circumferential shape of the ring portion.

As shown, in the present embodiment, the shape of the main body portion 25 is configured in the same manner as described in the second embodiment, but may be configured in the same manner as described in the other embodiments. However, in the present embodiment, it is different only in that the embossed portion 50 protruding inward is further formed in the third bent portion 25c of the ring portion 27.

There is no particular limitation on the shape and number of such embossing portions 50, but in this embodiment, as the optimum shape for performing the above-mentioned role, the height direction in the third bending portion 25c of the ring portion 27 It is formed that the embossed portion 50 is formed in a plurality at intervals along the outer periphery of the ring portion 27 is illustrated.

The embossing portion 50 is in contact with and supports the leaf spring 28, and serves to increase the rigidity of the ring portion 27. In other words, the embushing portion contacts the outer circumference of the leaf spring 28 so that the ring portion 27 supports the leaf spring 28 without being spaced between the leaf spring 28 and the ring portion 27. In addition, the rigidity of the ring portion 27 is increased so that deformation of the ring portion 27 made of a plate is reduced by being formed inwardly convex.

The rights of the present invention are not limited to the embodiments described above, but are defined by the claims, and those skilled in the art can make various modifications and adaptations within the scope of the claims. It is self-evident.

Claims

A rod antenna unit 10 which is formed in a straight line shape in a mobile wireless communication terminal and is freely stretched in a longitudinal direction, and is connected to the antenna unit so that the antenna unit can move inward, and attaches the antenna unit to the terminal body 20. In the stretchable antenna comprising a)

The connecting member 20,

A circular ring portion having a plurality of convex portions 22a protruding inwardly and contacting the rod antenna portion 10, wherein the convex portions are cut to elastically deform while pressing the rod antenna portion between the convex portions. With 22,

Plate bases extending from both ends of the ring portion 22 are formed by overlapping in two layers, and the base portion 21 is provided with a coupling hole 21a that can be fastened by screws in the terminal body,

The ring portion 22 and the base portion 21 is formed by bending one plate,

The two-ply base portion 21 is coupled by riveting or spot welding to limit the radial expansion of the ring portion, characterized in that the space-saving and cost-saving stretchable antenna.
The method of claim 1,

C-type pressing ring 23 is mounted on the outer periphery of the convex portion 22a to support the convex portion and partially cut to avoid interference with the base portion 21. Flexible antenna for reduced space and cost savings.
A rod antenna unit 10 which is formed in a straight line shape in a mobile wireless communication terminal and is freely stretched in a longitudinal direction, and is connected to the antenna unit so that the antenna unit can move inward, and attaches the antenna unit to the terminal body 20. In the stretchable antenna comprising a)

The connecting member 20,

The plate member is bent to have a circular ring portion 27 and a base portion 26 connected to the ring portion 27. A portion of the ring portion 27 is cut off, and the base portion 26 includes the terminal body. Body portion 25 is provided with a coupling hole (26a) that can be fastened by a screw;

A cylindrical leaf spring (28) inserted into an inner circumference of the ring portion (27) to press the rod antenna passing through the ring portion (27); And

Pressing the ring portion 27 from the outside to reduce the diameter of the ring portion 27 through the cut portion of the ring portion 27 to maintain the state in which the ring portion 27 grips the leaf spring 28 It is mounted to the outer periphery of the ring portion 27, the C-shaped pressing ring 29 is cut in part to avoid interference with the base portion 26; space reduction and cost reduction characterized in that it comprises a 2 telescopic antennas available.
The method of claim 3,

The base portion 26 is a flexible antenna that can be reduced in space and reduced cost, characterized in that the plate is formed by overlapping two layers at the end of the base portion (26).
The method of claim 3,

The base portion 26 is formed by overlapping the two sheets in the state that the plate is cut at the end of the base portion 26, characterized in that the two layers of plate material is bound to each other by the rivets (30) Flexible antenna for reduced space and cost savings.
The method of claim 3,

The base portion 26 is formed by overlapping in two layers in a state in which the plate is cut at the end of the base portion 26, the two layers of plate material is bound to each other by spot welding 40 Flexible antenna for reduced space and cost savings.
The method according to any one of claims 3 to 6,

The leaf spring has a convex portion projecting convexly toward the inner circumference,

In the interruption of the ring portion 27, the interruption of the ring portion 27 is recessed relative to the upper end and the lower end to prevent the leaf spring and the pressing ring 29 from coming off the upper end or the lower end of the ring part 27. The concave space at the outer circumference of the leaf spring and the first bent portion (25c) is bent inward to correspond to the shape of the pressing ring 29 so that the space can be reduced and the cost can be stretched type antenna.
The method of claim 7, wherein

The embossed portion protrudes toward the leaf spring 28 in order to support the leaf spring 28 and increase the rigidity of the ring portion 27 in the first bent portion 25c of the ring portion 27. Space-saving and cost-effective stretchable antenna, characterized in that 50 is formed.