JP4332170B2 - Coil element for antenna - Google Patents

Description

  The present invention relates to a coil element for an antenna that can be particularly preferably used as an antenna incorporated in a small communication device, a non-contact type IC card, or the like.

  A small communication device such as a mobile phone, a pager, a portable information processing terminal, a non-contact IC card, or the like incorporates an antenna that matches a use frequency.

  A conventional antenna may be formed by using a planar coil formed on a printed board in order to realize a predetermined frequency characteristic. The coil is formed in a two-dimensional pattern such as a spiral shape or a zigzag shape.

  According to such prior art, since the coil is two-dimensionally formed on the printed board, it is difficult to achieve high inductance with a small pattern size, and the applicable frequency range tends to be limited. There was a problem.

  Therefore, in view of the problems of the prior art, the object of the present invention is to form a three-dimensional coil on the base material by the first and second conductive patterns, thereby minimizing the pattern size and obtaining the necessary high inductance. An object of the present invention is to provide a coil element for an antenna that can be easily realized.

  In order to achieve this object, the configuration of the present invention comprises a base material of a printed circuit board and a plurality of sets of coils laminated on the base material via an insulating intermediate film, each of the coils being a first one. The conductive pattern, the insulating film formed on the first conductive pattern, and the second conductive pattern formed on the insulating film are three-dimensionally formed through the insulating film and formed in the terminal hole of the base material. The gist is to attach a terminal with a corresponding terminal hole to each of the coils, and to connect the terminals to be electrically connected by stacking the coils to an external electronic circuit via a connection line.

  The insulating film may be formed in the same shape as the base material excluding the terminal.

  Each set of coils may be stacked in the same direction with the same specification, may be stacked in the same direction with different resonance frequencies, or may be formed in different directions with the same specification.

  According to the configuration of the invention, the first and second conductive patterns can form a three-dimensional coil on the base material via the insulating film, and the coil at this time is a two-dimensional plane pattern. As compared with the case of the above, the number of turns can be remarkably increased, and a high inductance can be realized. The coil can be suitably used as a highly sensitive antenna that resonates at a predetermined operating frequency. Further, the base material referred to here includes an arbitrary insulating plate, insulating film, insulating sheet and the like in addition to the printed board.

  When a plurality of sets of coils are formed on the base material, for example, the same coil can be stacked in the same direction to form a stack type antenna element, and coils having different resonance frequencies can be stacked in the same direction. Configures a so-called polarization-synthesizing array type antenna element that can realize wideband characteristics and can transmit and receive both horizontally and vertically polarized waves well by forming the same coil in different directions can do.

  The insulating film made of a magnetic material serves as the core of the coil, and can further increase the inductance of the coil.

  Since the first and second conductive patterns can be printed on the base material and the insulating film, respectively, and the coil can be formed via the insulating film, the base material is a thin flexible film or the like. However, it is possible to easily form a three-dimensional coil only by a printing process.

  Further, since the first conductive pattern is formed on the base material by etching, it can be formed on the printed circuit board together with necessary connection lines and terminals by using the printed circuit board as the base material.

  That is, according to the present invention, the first and second conductive patterns are three-dimensionally arranged via the insulating film by providing the first conductive pattern, the insulating film, and the second conductive pattern formed on the base material. Therefore, the required high inductance can be easily realized by minimizing the pattern size, and an antenna having a good transmission / reception sensitivity can be easily formed.

  In addition, since the coil can be formed by printing or etching the first conductive pattern on the base material and sequentially printing the insulating film and the second conductive pattern, the coil element can be manufactured very easily. .

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

  The coil element includes first conductive patterns 21, 21,..., An insulating film 31, and second conductive patterns 22, 22 ... on the base material 11 (FIGS. 1 and 2). 2A and 2B are enlarged cross-sectional views corresponding to the lines XX and YY in FIG. 1, respectively.

  The base material 11 is a flexible insulating film, insulating sheet, or insulating plate. The first conductive patterns 21, 21... Are formed on the surface of the base material 11 diagonally in parallel within a range of length d2 and width d3 for each predetermined pitch d1. An insulating film 31 is formed on the first conductive patterns 21, 21..., And the insulating film 31 is formed within a range of length d 4> d 2 and width d 5 <d 3. The second conductive patterns 22, 22... Are overlapped on the first conductive patterns 21, 21... At the same pitch d 1 as the first conductive patterns 21, 21. Are formed in the same range in the opposite direction to the one conductive pattern 21, 21. Therefore, each second conductive pattern 22 protrudes from the both sides of the insulating film 31 onto the base material 11 to connect both ends of each first conductive pattern 21 in order. That is, the first and second conductive patterns 21, 21,..., 22, 22... Form a three-dimensional coil 20 having a length d2 and a width d3 as a whole through the insulating film 31.

  Such a coil element can be manufactured as follows (FIG. 3).

  The first conductive patterns 21, 21... Are diagonally printed on the base material 11 (FIG. 1A), and the insulating film 31 is printed on the first conductive patterns 21, 21. (B)), the second conductive patterns 22, 22... Are printed on the insulating film 31 ((C) in the figure) to form the coil 20. The first conductive patterns 21, 21... May be formed by etching using the base material 11 as a printed board.

  On the other hand, the coil element manufactured in this way is compactly incorporated into a small communication device or IC card and used as a planar antenna such as a helical antenna for transmission and reception, a bar antenna, an inductance element for a high frequency circuit, It can be widely used as a transformer element.

  In the above description, the insulating film 31 may be a magnetic material. The insulating film 31 made of a magnetic material can further increase the inductance of the coil 20.

Other embodiments

  A terminal 23 can be attached to the coil 20 (FIGS. 4 and 5).

  The base material 11 is a printed circuit board, and the first conductive patterns 21, 21... And the terminals 23 are formed on the base material 11 by etching. The terminal 23 is formed with a terminal hole 23 b corresponding to the terminal hole 11 a of the base material 11.

  The insulating film 31 is formed in the same shape as the base material 11 excluding the terminal 23. Through holes 31 a, 31 a... Are formed in the insulating film 31 corresponding to both end portions of the first conductive patterns 21. In addition, the second conductive patterns 22, 22... Are formed on the insulating film 31 to sequentially connect the adjacent first conductive patterns 21, 21 through the through holes 31 a, 31 a, respectively. A three-dimensional coil 20 is formed together with the conductive patterns 21, 21. The coil 20 can be connected to an external electronic circuit via the connection line C by soldering the connection line C to the terminal 23 via the terminal holes 11a and 23b.

  A protective film 32 may be formed on the second conductive patterns 22, 22... (FIGS. 4 and 5). The protective film 32 covers the second conductive patterns 22, 22, except for the terminals 23. Therefore, the protective film 32 can sandwich the second conductive patterns 22, 22... Between the insulating film 31 and prevent the second conductive patterns 22, 22.

  A plurality of sets of coils 20 and 20 may be formed on the base material 11 (FIG. 6). Each set of coils 20 is formed in the same direction via an insulating film 31, and is laminated on the common base material 11 via another insulating intermediate film 33. Each coil 20 is provided with a terminal 23 with a terminal hole 23 b, and the terminals 23 and 23 are electrically connected by stacking the coils 20 and 20. Therefore, the coils 20 and 20 can constitute a stack type antenna element on the common base material 11.

  In FIG. 6, the coils 20 and 20 can be formed in different specifications so as to resonate at different frequencies so as to realize wideband characteristics. Further, the coils 20 and 20 may be formed in the same plane on the same plane on the base material 11 in different directions through a common insulating film 31 so as to correspond to polarized waves in both horizontal and vertical directions. That is, the coils 20 and 20 may be formed in the same or different specifications, and may be formed in the same or different directions. Furthermore, the coil 20 can be formed in an arbitrary multilayer of two or more layers.

Overall configuration perspective view 1 is an enlarged cross-sectional explanatory diagram of the main part Manufacturing process diagram FIG. 1 equivalent view showing another embodiment Exploded perspective view of FIG. Exploded perspective view showing another embodiment

Explanation of symbols

DESCRIPTION OF SYMBOLS 11 ... Base material 20 ... Coil 21 ... 1st conductive pattern 22 ... 2nd conductive pattern 23 ... Terminal 31 ... Insulating film 33 ... Intermediate film

Patent Applicant Shirou Sugimura
Soichiro Yamada
FCE Co., Ltd.
Lexton Corporation
Attorney Tadaaki Matsuda, Attorney

Claims (5)

A base material of a printed circuit board and a plurality of sets of coils laminated on the base material via an insulating intermediate film, the coils comprising a first conductive pattern and a first conductive pattern, respectively. A terminal with a terminal hole corresponding to the terminal hole of the base material, which is formed in a three-dimensional manner through the insulating film by an insulating film formed thereon and a second conductive pattern formed on the insulating film was attached to each of said coils, coil element for the antenna, characterized in that to connect to an external electronic circuit via the terminal connection line electrically connected by laminating the coil. The insulating coating, coil element antenna of claim 1, wherein that you formed on the base material and the same shape except for the terminal.   The coil element for an antenna according to claim 1 or 2, wherein the coils of each set have the same specifications and are stacked in the same direction.   3. The antenna coil element according to claim 1, wherein the coils of each set are stacked in the same direction with different resonance frequencies.   3. The antenna coil element according to claim 1, wherein the coils of each set are formed in different directions with the same specifications.

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