JP2005150910A - Antenna and manufacturing method thereof - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an antenna the mount area of which is minimized and a manufacturing cost of which is decreased. <P>SOLUTION: The antenna 3 includes an antenna main body 7 and a proper number of support terminals 9 for supporting the antenna main body 7. Then ends 9a of the proper number of support terminals 9 are mounted on a mount face 5a at a small area and a mount region is ensured in a space SP formed between the antenna main body 7 and the mount face 5a. Further, the antenna 3 is manufactured by a step of punching a plate shaped work to form an antenna shape, a step of integrating a prescribed region of the antenna shape with resin mold; and a step of separating the resin-molded antenna shape from the work and finishing the shape. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to an antenna and a method for manufacturing the antenna, and more particularly to an antenna suitable for a wireless system such as a wireless LAN (local area network) using a microwave band or a mobile phone, and a method for manufacturing the antenna.

  Conventionally, for example, a monopole antenna or the like that can be housed and pulled out in a telephone housing is generally used as an antenna for use in a portable terminal, for example. Built into the body is desired. As the built-in antenna, an inverted F antenna, a microstrip antenna, or the like in which a monopole antenna is bent in parallel with the ground plane to reduce size and thickness is used.

See also Patent Document 1.
JP-A-7-131231

  Such conventional alignment has the following problems. That is, the conventional inverted-F antenna or microstrip antenna as described above requires an external dimension of a certain level or more in order to ensure a sufficient band and gain, and is approximately the same as the antenna area inside the terminal. There is a problem that a mounting area is required and it is difficult to incorporate it in a small terminal such as a recent mobile phone.

  The present invention has been made in view of the above-described problems. The invention according to claim 1 is an antenna that is provided in a device having a communication function and mediates radio waves for communication. The antenna body has an appropriate number of support terminals, and the end portions of the appropriate number of support terminals are mounted on a mounting surface of the device with a small area, and the antenna body and the mounting surface It is an antenna in which a mounting area is secured in a space formed therebetween.

  The invention according to claim 2 is the antenna according to claim 1, further comprising a resin mold part that integrates the antenna body and the appropriate number of support terminals.

  According to a third aspect of the present invention, the antenna body and the support terminal are punched from a plate-shaped workpiece, and after the pattern shape of the antenna is formed, the antenna main body and the support terminal are integrated by a resin mold and separated from the workpiece. The antenna according to claim 2.

  According to a fourth aspect of the present invention, there is provided a method of manufacturing an antenna provided in a device having a communication function and mediating communication radio waves, a step of punching a plate-like workpiece to form an antenna pattern shape, and the antenna pattern. This is a method for manufacturing an antenna including a step of performing resin molding processing on a predetermined region of the shape and integrating the whole, and a step of separating and finishing the pattern shape of the resin-molded antenna from the workpiece.

  As described above, according to the present invention, since only a mounting area only around the GND (ground) terminal (support terminal) for supporting the housing is required, an antenna mounting area can be minimized. Thereby, for example, it is suitable as a built-in antenna for a mobile phone that is highly necessary for miniaturization.

  Since the wiring can be passed through the lower part of the antenna, there is an effect that the mounting area of the antenna can be secured even if the wiring density is increased. More specifically, when the antenna is mounted on the circuit board, the lower part of the antenna (between the antenna and the circuit board) is a space. For this reason, since the wiring can be arranged also in the antenna mounting portion, there is an effect that the wiring area is not greatly reduced for securing the antenna mounting area.

  As a result, it is effective to apply the antenna of the present invention to a mobile phone that currently has a tendency of increasing the wiring density of the circuit board. In addition, since the conventional lead frame manufacturing technology is applied, no additional manufacturing equipment or the like is required, and the antenna shape and the antenna housing support (support terminal) are supplied simultaneously with the power supply, GND by only a simple process by punching. Since all the terminals that play a role can be formed together, there is an effect that the cost is lower than that of a conventional antenna.

  Embodiments of the present invention will be described with reference to the drawings. FIG. 1 schematically shows a mounting portion of a device 1 (for example, a wireless LAN system, a mobile phone, etc.) 1 on which an antenna 3 having a communication function is mounted.

  The antenna 3 has an antenna body 7 and an appropriate number of support terminals 9 that support the antenna body 7. In this example, support terminals (for example, three) 9 are separated from the antenna body 7. Thereby, there is little influence on the characteristic of the antenna 3, and the performance of the antenna 3 improves. In other words, when the support terminal 9 and the antenna body 7 are integrated, the support terminal 9 acts as a part of the antenna body 7, so that the performance of the antenna is deteriorated. In this example, the support terminal 9 is GND-connected. Thereby, extra static electricity or the like is not accumulated.

  On the other hand, the antenna body 7 includes a GND (ground) terminal 11 and a power feeding terminal 13. The GND terminal 11 is grounded and plays a role as a support terminal for supporting the antenna body 7. Similarly, the power supply terminal 13 is connected to a power supply line and serves as a support terminal for supporting the antenna body 7. As a result, the antenna 3 is more securely fixed and is not easily affected by vibrations from the apparatus.

  Continue the explanation. The end portions 9a of the appropriate number of support terminals 9 are mounted on the mounting surface 5a of the substrate 5 of the device 1 with a small area. The end portion 11a of the GND terminal 11 is mounted on the mounting surface 5a of the substrate 5 of the device 1 with a small area. An end portion 13a of the power supply terminal 13 is mounted on a mounting surface 5a of the substrate 5 of the device 1 with a small area.

  Since the small mounting area is small as described above, a sufficient mounting area SP is ensured in the space formed between the antenna body 7 and the mounting surface 5a. As a result, the substrate wiring 15 can be formed in the mounting region SP secured on the mounting surface 5a, which is useful for downsizing the device (for example, a mobile phone).

  The antenna 3 described above has a resin mold portion 16 that integrates the antenna body 7 and the appropriate number of support terminals 9. Thereby, even if the antenna body 7 and the support terminal 9 are separated, they can be integrated. That is, since the support terminal 9 is separated as described above, the influence on the antenna can be reduced (in other words, when the antenna body 7 and the support terminal 9 are not separated, the support terminal 9 is not connected to the antenna body 7). To reduce the performance of the antenna 3).

  FIG. 2 shows a conceptual diagram of the antenna. In the normal antenna body A, the power supply terminal SC is connected to the power supply unit S, and the ground terminal GC is connected to the ground G. In the case of the antenna 3 according to this example, as shown in FIG. 3, the GND terminal 11 of the antenna body 7 is connected to the outer conductor (ground line) 19 of the coaxial cable 17. The power supply terminal 13 is connected to the central conductor (feed line) 21 of the coaxial cable 17. Thereby, transmission and reception between the antenna 3 and the device 1 can be performed.

  The operation as an antenna will be described. By supplying power from the terminal portion (see FIG. 1), a current flows through the plane frame portion. A loop is formed by connecting the terminals beside the power supply terminal to GND, and the antenna operates as an inverted F antenna. The required resonance frequency can be adjusted by changing the length L of the slit portion (for example, ½ of the wavelength).

  The antenna 3 is manufactured by forming the pattern shape of the antenna 3 by punching the antenna body 7 and the support terminal 9 from a plate-shaped workpiece, and then integrating them with a resin mold and separating them from the workpiece. It is desirable.

  That is, the workpiece is punched into the pattern shape of the antenna 3 and resin molding is performed. Then, the power supply / GND terminal and the three support terminals for mounting the antenna are bent and mounted on the circuit board by soldering or the like.

  The above manufacturing method is a manufacturing method similar to the manufacturing process of the lead frame. As a result, the antenna can be manufactured using existing lead frame manufacturing equipment and the like, and there is an effect that it is not necessary to make a new capital investment.

  As shown in FIG. 4, which will be described in more detail, a plate-like workpiece W is fed from a direction of an arrow to a progressive die (not shown).

  As shown in FIG. 5, a plate-like workpiece W is punched to form an antenna pattern shape 23. The antenna pattern shape 23 includes an antenna body (pattern shape) 25, a support terminal (pattern shape) 27, a power supply terminal (pattern shape) 29, and a GND terminal (pattern shape) 31. In this state, the support terminal 27, the GND terminal 31, and the power feeding terminal 29 are not separated from the work (carrier) W.

  As shown in FIG. 6, a predetermined part 33 of the antenna pattern shape 23 is integrated by resin molding. As a result, the support terminal (pattern shape) 27 and the antenna body (including the power supply terminal 29 and the GND terminal 31) 25 are integrated.

  As shown in FIG. 7, the pattern shape 23 of the antenna on which resin molding has been performed is separated from the workpiece W. Then, as shown in FIG. 6, the antenna 35 is completed by bending the support terminal 27, the power supply terminal 29, and the GND terminal 31.

  In addition, this invention is not limited to the example of the embodiment mentioned above, It can implement in another aspect by adding an appropriate change.

It is the schematic explaining the outline of the mounted antenna. It is explanatory drawing explaining the electric power feeding of an antenna. It is explanatory drawing explaining the electric power feeding of an antenna. It is explanatory drawing explaining the manufacturing process of an antenna. It is explanatory drawing of a continuation of FIG. It is explanatory drawing of a continuation of FIG. It is explanatory drawing of a continuation of FIG. It is explanatory drawing of a continuation of FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Device 3 Antenna 5 Board | substrate 5a Mounting surface 7 Antenna main body 9 Supporting terminal 9a End part 11 GND terminal 11a End part 13 Feeding terminal 13a End part 15

Claims (4)

In an antenna that is provided in a device having a communication function and mediates communication radio waves,
The antenna has an antenna body and an appropriate number of support terminals that support the antenna body.
The end portions of the appropriate number of support terminals are mounted on a mounting surface of the device with a small area,
A mounting area is secured in a space formed between the antenna body and the mounting surface.   The antenna according to claim 1, further comprising a resin mold portion that integrates the antenna body and the appropriate number of support terminals.   The antenna main body and the support terminal are punched from a plate-shaped workpiece, and after the pattern shape of the antenna is formed, the antenna main body and the support terminal are integrated by a resin mold and separated from the workpiece. 2. The antenna according to 2. In a method of manufacturing an antenna that is provided in a device having a communication function and mediates communication radio waves,
A step of punching a plate-shaped workpiece to form a pattern shape of the antenna;
A step of performing resin molding processing on a predetermined region of the antenna pattern shape and integrating the whole; and
A step of separating and finishing the pattern shape of the resin-molded antenna from the workpiece;
The manufacturing method of the antenna characterized by including.

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