JP2013074617A - Communication terminal device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a technique capable of implementing miniaturization and improvement of a communication range of a magnetic field radiating antenna by means of providing a magnetic material at a coil, and capable of making the magnetic field radiating antenna and an electric field radiating antenna be allocated adjacent to each other by preventing loss caused by conversion of an electromagnetic wave radiated by the electric field radiating antenna to heat in the magnetic material.SOLUTION: Miniaturization and improvement of a frequency characteristic of a magnetic field radiating antenna 4 are implemented by means of providing a magnetic material sheet 43 at a coil 42, where the magnetic material sheet 43 is shielded from an electromagnetic wave radiated by an electric field radiating antenna 3 by means of allocating a piece 44b of a radiation plate 44 to between the magnetic material sheet 43 of the magnetic field radiating antenna 4 and the electric field radiating antenna 3. Thereby, loss of the electromagnetic wave radiated by the electric field radiating antenna 3 in the magnetic material sheet 43 can be prevented, and the magnetic field radiating antenna 4 and the electric field radiating antenna 3 can be allocated adjacent to each other.

Description

  The present invention relates to a communication terminal device including a magnetic field radiation antenna and a field radiation antenna.

  In recent years, communication terminal devices such as mobile phones, smartphones, and personal digital assistants have become more multifunctional. RFID (Radio Frequency IDentification System), GPS (Global Positioning System), One Seg, Bluetooth (registered trademark), WiFi, etc. Communication terminal devices having a plurality of functions such as a wireless LAN, a communication function based on a communication standard such as a GSM (Global System for Mobile Communications) standard and a CDMA (Code Division Multiple Access) standard are provided.

  The multifunctional communication terminal device as described above is provided with a plurality of field emission antennas used for communication according to GPS, One Seg, Bluetooth, wireless LAN, GSM standard, CDMA standard, and the like. Communication terminal devices are also often used for electronic money payments using short-range communication standards such as NFC (Near Field Communication) and Felica (registered trademark of Sony Corporation), and short-range communication for that purpose. An antenna is installed. Then, the communication terminal device equipped with the short-range communication antenna is brought closer to the reader / writer device installed in the convenience store, or the reader / writer device installed in the automatic ticket gate, so that the communication terminal device and the reader Communication is performed between the short-range communication antennas of the writer device.

  Here, in the case of performing communication in accordance with the near field communication standard, the frequency is 13.56 MHz using the HF band, and communication is performed by radiating a magnetic field by an electromagnetic induction method. For this reason, the magnetic field radiation type antenna is mounted on the communication terminal device as the short-range communication antenna.

  By the way, in recent years, miniaturization of communication terminal devices has progressed, and for example, as shown in FIG. 12, it is required to place the magnetic field radiation antenna 500 and the electric field radiation antenna 501 in close proximity. There is a problem that the type antenna 500 and the field emission type antenna 501 interfere with each other. That is, the frequency band used in the magnetic field radiation antenna 500 is the HF band (13.56 MHz), and the frequency band used in the field radiation antenna 501 is about 450 MHz to about 2.5 GHz. In addition to the HF band, the antenna 500 periodically has secondary resonance points at low and high orders. Therefore, when the higher-order resonance point of the magnetic field radiation antenna 500 overlaps with the use frequency band of the field radiation antenna 501, the gain of the field radiation antenna 501 decreases.

  In view of this, the magnetic material (ferrite) 502 that reduces the frequency component at the high-order resonance point of the magnetic field radiation antenna 500 is provided in the coil pattern 500a of the magnetic field radiation antenna 501 so that the high-order resonance that the magnetic field radiation antenna 500 has. There has been proposed a technique for preventing interference with the field emission antenna 501 due to a point and preventing a decrease in gain of the field emission antenna 501 (see, for example, Patent Document 1). Specifically, as shown in FIG. 12, in order to adjust the frequency characteristics of the field radiation antenna 501, a portion where one side of the coil pattern 500 a of the magnetic field radiation antenna 500 is closest to the field radiation antenna 501, The magnetic body 502 is provided at a site where interference between the magnetic field radiation antenna 500 and the field radiation antenna 501 is most likely to occur.

  In this way, the magnetic body 502 has a large impedance in the high frequency band, and the frequency component at the high-order resonance point of the magnetic field radiation antenna 500 is reduced. ), The influence of the high-order resonance point of the magnetic field radiation antenna 500 is reduced. FIG. 12 is a diagram showing an example of the configuration of a conventional magnetic field radiation antenna and a field radiation antenna.

International Publication No. 2008/0556200 (paragraphs 0041-0053, FIG. 7 etc.)

  As described above, by providing the magnetic body 502 in the coil pattern 500a of the magnetic field radiation antenna 500, the frequency characteristics of the magnetic field radiation antenna 500 can be improved. In addition, by providing a magnetic body in the coil pattern 500a, a large inductance can be obtained even if the number of turns of the coil pattern 500a is reduced, so that the magnetic field radiation antenna 500 can be downsized.

  By the way, by providing the magnetic body 502 in the magnetic field radiation type antenna 500, the frequency characteristics of the magnetic field radiation type antenna 500 are improved, and the electric field radiation when the magnetic field radiation type antenna 500 and the field radiation type antenna 501 are arranged close to each other. While the influence of the higher-order resonance point of the magnetic field radiation antenna 500 in the use frequency band of the mold antenna 501 can be reduced, the following problems have occurred. That is, the magnetic body 502 has a large loss of electromagnetic energy in the use frequency band of the field radiation antenna 501, and the magnetic field radiation antenna 500 and the field radiation antenna 501 are disposed close to each other, so that the field radiation antenna 501 and the magnetic field 502 are magnetic. When the body 502 is coupled, a part of the electromagnetic wave radiated from the field emission antenna 501 is absorbed by the magnetic body 502 and is lost as heat. For this reason, there was a problem that the communication characteristics of communication using the field emission antenna 501 deteriorated.

  The present invention has been made in view of the above-described problems. By providing a magnetic body in the coil, the magnetic field radiation antenna can be reduced in size and communication distance can be improved, and electromagnetic waves radiated from the field radiation antenna can be reduced. Provided is a technique capable of preventing a magnetic material from being lost as heat and arranging a magnetic field radiation antenna and a field radiation antenna close to each other.

  In order to achieve the above-described object, a communication terminal device of the present invention is formed of a magnetic field radiation antenna having a coil provided with a magnetic material, a field radiation antenna, and a nonmagnetic conductive material, and the magnetic field A shielding plate is provided between the magnetic body of the radiation antenna and the field radiation antenna and shields the magnetic body from electromagnetic waves radiated from the field radiation antenna. Item 1).

  The magnetic field radiating antenna further includes a radiating plate that radiates a magnetic field by being magnetically coupled to the coil, and the radiating plate is bent between a portion of the magnetic body and the field radiating antenna. The shielding plate may be formed by a part of the radiation plate disposed between the magnetic body and the field emission antenna.

  Further, the radiation plate may have a coil shape.

  According to the first aspect of the present invention, the magnetic material is provided in the coil, so that the magnetic radiation antenna can be reduced in size and the communication distance can be improved, and the shielding plate formed of a nonmagnetic conductive material is magnetic field radiation type. Since the magnetic material is shielded from electromagnetic waves radiated from the field emission antenna by being arranged between the magnetic material of the antenna and the field emission antenna, the field emission antenna and the magnetic material are prevented from being combined. Since the electromagnetic wave radiated from the field emission antenna can be prevented from being lost as heat by the magnetic material, the magnetic field emission antenna and the field emission antenna can be disposed close to each other. Accordingly, since the magnetic field radiation antenna and the field radiation antenna can be arranged close to each other, the degree of freedom in designing the arrangement positions of the magnetic field radiation antenna and the field radiation antenna can be increased.

  According to the invention of claim 2, the magnetic field radiation type antenna further includes a radiation plate that radiates a magnetic field by being magnetically coupled to the coil. Therefore, the radiation plate has a larger area than the coil by receiving the magnetic field generated from the coil. As the induced current is generated along the edge of the wire, the radiated magnetic field loop becomes larger, so that the communication characteristics of communication using the magnetic field radiation antenna are prevented from deteriorating even if the coil is miniaturized. Communication distance can be extended.

  In addition, the radiation plate is partially bent and disposed between the magnetic body and the field emission antenna, and the shielding plate is a radiation plate disposed between the magnetic body and the field radiation antenna. By forming partly, the number of parts is reduced, so that it is possible to provide a communication terminal device having a simple configuration capable of preventing the magnetic body and the field emission antenna from being coupled.

  According to invention of Claim 3, since a radiation plate is coil shape, the magnetic field which generate | occur | produces in a coil can be enlarged more efficiently and can be amplified.

It is a figure which shows the communication terminal device concerning 1st Embodiment of this invention. It is a principal part enlarged view of the communication terminal device of FIG. 1, Comprising: (a) is a perspective view, (b) is a top view. It is a figure for demonstrating operation | movement of the communication terminal device of FIG. 1, Comprising: (a) is a perspective view, (b) is a cutting | disconnection side view. It is the principal part enlarged view of the communication terminal device concerning 2nd Embodiment of this invention, Comprising: (a) is a perspective view, (b) is a top view. It is a principal part enlarged view of the communication terminal device concerning 3rd Embodiment of this invention, Comprising: (a) is a perspective view, (b) is a top view. It is a top view of the control board of the communication terminal device concerning a 4th embodiment of the present invention. It is a cutting | disconnection side view of the control board of the communication terminal device concerning 5th Embodiment of this invention. It is a principal part enlarged view of the communication terminal device concerning 6th Embodiment of this invention, (a) is a perspective view, (b) is a figure which shows the plate-shaped member before bending to a radiation plate. It is a principal part enlarged view of the communication terminal device concerning 7th Embodiment of this invention, Comprising: (a) is a perspective view, (b) is a top view, (c) is plate shape before bending to a radiation plate. It is a figure which shows a member. It is a cutting | disconnection side view of the control board of the communication terminal device concerning 8th Embodiment of this invention. It is a figure which shows the modification of the communication terminal device of this invention. It is a figure which shows an example of a structure of the conventional magnetic field radiation type antenna and electric field radiation type antenna.

<First Embodiment>
1st Embodiment of the communication terminal device of this invention is described with reference to FIGS. FIG. 1 is a diagram showing a communication terminal apparatus according to the first embodiment of the present invention. 2 is an enlarged view of a main part of the communication terminal device of FIG. 1, wherein (a) is a perspective view and (b) is a plan view. FIG. 3 is an enlarged view of a main part for explaining the operation of the communication terminal apparatus of FIG. 1, wherein (a) is a perspective view and (b) is a cut side view. In FIG. 1 to FIG. 3, only the main configuration according to the present invention is shown for ease of explanation, and other configurations are not shown. Also, in FIGS. 4 to 10 used in the following description, only the main configuration according to the present invention is shown in the same manner as FIGS. 1 to 3, and the description thereof will be omitted below.

(Constitution)
The communication terminal device 1 shown in FIG. 1 has a communication function based on a communication standard such as 900 MHz band, 1.8 GHz band, and 2 GHz band, such as GSM standard and CDMA standard, and NFC standard that uses a frequency in the HF band. And a control board 2 provided in the housing 1a. The control board 2 is equipped with a memory (not shown) in which various programs are stored and a CPU (not shown) that performs various controls by executing the programs stored in the memory. The control board 2 includes a field emission antenna 3 used for communication according to a communication standard using a frequency in the 900 MHz band and a near field communication using RFID (NFC standard) using a frequency in the HF band. And a magnetic field radiation type antenna 4 used in the above.

  Then, when an operation means such as a push button or a touch panel (not shown) provided in the communication terminal device 1 is operated, the CPU mounted on the control board 2 is a predetermined program stored in the memory based on the operation content. By performing the above, a predetermined display is performed on a flat panel display (not shown) formed by the LCD or organic EL and provided in the communication terminal device 1, and functions such as a call and mail by the field emission antenna 3 are performed. Or short-range communication by the magnetic field radiation antenna 4 is executed.

  In addition, when it is detected that a signal is transmitted from the outside to the communication terminal device 1, the CPU executes a predetermined program stored in the memory based on the received signal, so that the flat panel display A predetermined display is performed, a function such as a telephone call or mail using the field emission antenna 3 is executed, or a short distance communication is executed using the magnetic field emission antenna 4. Below, it demonstrates focusing on the communication function by RFID which the communication terminal device 1 has.

  As shown in FIG. 2A, the field emission antenna 3 has a conductive antenna pattern 32a that functions as an antenna used for communication in a frequency band of 2 GHz on the surface of a prismatic insulating base 31. And a conductive antenna pattern 32b functioning as an antenna used for communication in the 800 MHz frequency band, and a conductive terminal pattern 32c connected to the antenna input terminal of the control board 2 32 is provided. The field emission antenna 3 is disposed on the control board 2 adjacent to the edge along the short side direction of the control board 2 substantially parallel to the short side direction of the control board 2 having the longitudinal direction. preferable.

  The magnetic field radiation antenna 4 includes a rectangular plate-shaped base substrate 41, a coil 42 provided on one main surface of the base substrate 41, and a rectangular plate-shaped magnetic sheet 43 provided on the coil 42. And a radiation plate 44 formed of a nonmagnetic conductive material. The magnetic field radiation antenna 4 is provided adjacent to the electric field radiation antenna 3 in the vicinity of the control board 2. In this embodiment, the magnetic field radiation antenna 4 is formed in a rectangular shape, but the shape of the magnetic field radiation antenna 4 is not particularly limited to a rectangular shape.

  The base substrate 41 is formed of a flexible substrate formed of polyimide, polyethylene terephthalate (PET), polyethylene naphthalate (PEN), or the like. Note that the base substrate 41 may be formed of a glass epoxy substrate or the like.

  The coil 42 is formed by a spiral wiring pattern formed on one main surface of the base substrate 41 by a metal conductor such as Cu or Al. The spiral wiring pattern can be formed by, for example, forming a thin film of a metal conductor on the base substrate 41 and photolithography. The coil 42 may be constituted by a wiring pattern formed in a helical shape over a plurality of layers of the base substrate 41.

  The magnetic material sheet 43 is formed in a substantially L-shaped cross section by bending a part of a member in which a magnetic material such as ferrite is formed in a sheet shape at a substantially right angle. Further, the magnetic sheet 43 is bent on the main surface on the control board 2 side opposite to the side on which the communication partner of the communication terminal device 1 is arranged in the short-range communication among the two main surfaces of the base substrate 41. The coil 42 is arranged so that the portion faces the control board 2. In the present embodiment, the magnetic sheet 43 is bent and processed at a substantially right angle, but is not particularly limited to this form. Even when the magnetic sheet 43 is formed by bending along the radiation plate 44, the magnetic sheet 43 may be bent as well as bent.

The radiation plate 44 is made of Al, Cu, ITO (Indium
Tin Oxide), a part of a plate-like member made of a non-magnetic conductive material such as C is formed into a substantially L-shaped cross section by being bent at a substantially right angle, and magnetically coupled to the coil 42 A magnetic field larger than the magnetic field generated in the coil 42 is radiated. In addition, the large-area side piece 44a of the radiation plate 44 having a substantially L-shaped cross section has a rectangular shape that is substantially the same size as the opening 42a at the winding center of the spiral coil 42 formed on the base substrate 41. The through hole 45 and a slit 46 communicating from the through hole 45 to the edge of the radiation plate 44 are formed. In addition, since the variation in the L value of the coil 42 can be reduced, it is preferable that the size of the through hole 45 formed in the radiation plate 44 is substantially the same as or smaller than the size of the opening 42 a at the winding center of the coil 42.

  Further, the radiation plate 44 is formed to have a larger area than the area of the region where the coil 42 is formed. In addition, as shown in FIG. 1, the other piece 44b on the small area side of the radiation plate 44 having a substantially L-shaped cross section has a length from the bending position in the cross section longer than the length of the bent portion of the magnetic material sheet 43. It is formed to be long.

  The radiation plate 44 has a through hole 45 on the main surface on the side of the casing 1a on the same side as the side on which the communication partner of the communication terminal device 1 is arranged in the communication using RFID. And the opening 42a of the coil 42 overlap with each other when viewed from above, and the other piece 44b is disposed toward the control board 2 so that the other piece 44b is disposed between the magnetic sheet 43 and the field emission antenna 3. The coil 42 is provided.

  With this configuration, since the length of the other piece 44b from the bending position of the radiation plate 44 is formed longer than the length of the bent portion of the magnetic sheet 43, the magnetic sheet is viewed from the field emission antenna 3. 43 becomes invisible by the other piece 44 b of the radiation plate 44. Therefore, since the radiation plate 44 is formed of a nonmagnetic conductive material, the radiation plate 44 shields the magnetic sheet 43 from electromagnetic waves radiated from the field radiation antenna, and the field radiation antenna The electromagnetic wave radiated from 3 is blocked by the other piece 44 b of the radiation plate 44 before reaching the magnetic sheet 43. As described above, in this embodiment, the other piece 44 b functions as a “shielding plate” of the present invention that shields the electromagnetic waves radiated from the field emission antenna 3 from reaching the magnetic sheet 43. In the present embodiment, a part of the radiation plate 44 is bent at a substantially right angle, but the present invention is not particularly limited to this form. For example, if a part of the radiation plate 44 can be disposed between the magnetic sheet 43 and the field emission antenna 3, a part of the radiation plate 44 may be bent so as to be bent.

(Operation of magnetic radiation type antenna)
Next, the operation of the magnetic field radiation antenna 4 will be described. In this embodiment, the communication terminal device 1 includes the magnetic field radiation antenna 4 and the RFIC 47 formed of a semiconductor connected to the magnetic field radiation antenna 4. Short-range communication is performed with the Raso '43 device. As shown in FIG. 1, the RFIC 47 is mounted on the control board 2, and the coil 42 and the RFIC 47 are DC-connected through the connection pins 48.

  When an induced current flows through the coil 42 of the magnetic field radiating antenna 4 due to a magnetic field generated from the magnetic field radiating antenna of the reader / writer device of the communication partner, the radiation plate 44 prevents the increase of magnetic flux generated by the induced current. A current flows through the edge portion of the through hole 45. And as shown by the arrow in Fig.3 (a), the electric current which flowed through the edge part of the through-hole 45 passes along the periphery of the slit 46, and the outer edge part of the one piece 44a of the radiation plate 44 and the outer edge part of the other piece 44b, It flows in the same direction as the induced current flowing in the coil 42. Therefore, as shown in FIG. 3B, since the area of the radiation plate 44 is larger than the area of the region where the coil 42 is formed, a magnetic field MF larger than the magnetic field generated in the coil 42 is generated. It is generated by the current flowing through the outer edge portion of 44. In other words, the magnetic field MF obtained by greatly amplifying the magnetic field generated in the coil 42 is generated by the current flowing through the outer edge portion of the radiation plate 44.

  At this time, as indicated by an arrow in FIG. 3B, the current flowing through the outer edge portion of the one piece 44a on the outer edge portion of the other piece 44b formed by bending a part of the radiation plate 44 substantially at right angles Since a current flows in a substantially orthogonal direction, a magnetic field MF having directivity on the other piece 44 b side is generated in the magnetic field radiation antenna 4. Therefore, the directivity of the magnetic field MF generated in the magnetic field radiation antenna 4 can be adjusted by appropriately adjusting the bending angle and the bending position of the radiation plate 44.

  Moreover, since the inductance of the coil 42 is increased by providing the magnetic sheet 43 in the coil 42, the coil 42 can be downsized and the communication distance can be improved. Further, as indicated by a broken line in FIG. 3B, since the magnetic sheet 43 is provided below the coil 42 so as to face the control board 2, the magnetic sheet 43 serves as a magnetic path and emits magnetic field. Since the magnetic field MF generated in the mold antenna 4 is deflected in the surface direction of the radiation plate 44, the magnetic field MF can be prevented from interfering with various electronic components and wiring patterns provided on the control board 2.

  In this embodiment, an example in which an active type near field communication antenna is formed by the magnetic field radiation antenna 4 is shown. However, a passive type near field communication antenna is formed by the magnetic field radiation antenna 4. May be.

  As described above, in this embodiment, the magnetic material sheet 43 is provided in the coil 42, thereby reducing the size of the magnetic field radiation antenna 4 and improving the communication distance. Further, the other piece 44b of the radiation plate 44 formed of a nonmagnetic conductive material is disposed between the magnetic sheet 43 of the magnetic field radiation antenna 4 and the field radiation antenna 3, so that the field radiation antenna is obtained. Since the magnetic sheet 43 is shielded from electromagnetic waves radiated from the electric field 3, it is possible to prevent the electric field radiation type antenna 3 and the magnetic sheet 43 from being combined.

  Accordingly, it is possible to prevent the electromagnetic wave radiated from the field emission antenna 3 from being lost as heat by the magnetic material sheet 43, so that the magnetic field emission antenna 4 and the field emission antenna 3 can be arranged close to each other. it can. Therefore, since the magnetic field radiation antenna 4 and the field radiation antenna 3 can be disposed close to each other, the degree of freedom in designing the arrangement positions of the magnetic field radiation antenna 4 and the field radiation antenna 3 can be increased.

  By the way, when a member formed of a conductive material such as metal is disposed in the vicinity of the field emission antenna 3, the conductive member and the field emission antenna 3 are coupled to each other so that the radiation of the field emission antenna 3 can be obtained. Conventionally, since the resistance is reduced and the radiation characteristics of the antenna are changed, or a capacitance is formed between the field emission antenna 3 and the conductive member, and it is difficult for the electric field energy to be radiated. The layout of various components has been determined so that a member formed of a conductive material is not disposed in the vicinity of the field emission antenna 3.

  However, the electromagnetic wave radiated from the field emission antenna 3 is radiated to some extent by the radiation plate 44, but the magnitude of the loss is due to the extremely high conductivity of the radiation plate 44. The communication characteristics of communication using the field emission antenna 3 are not greatly deteriorated. Accordingly, paying attention to the fact that the electromagnetic characteristics radiated from the field radiation antenna 3 are lost by the magnetic sheet 43, the communication characteristics of communication using the field radiation antenna 3 are greatly deteriorated, and the antenna characteristics are changed. It is the most significant feature of the present invention exemplified as this embodiment that the radiation plate 44 (shielding plate) having a fear is disposed between the magnetic material sheet 43 and the electric field radiation type antenna 3.

  Therefore, when the field radiation antenna 3 and the radiation plate 44 are designed such that the field radiation antenna 3 has predetermined antenna characteristics in a state where the conductive radiation plate 44 and the field radiation antenna 3 are arranged close to each other. Good. With this configuration, it is possible to use the field emission antenna 3 having a predetermined antenna characteristic in a state of being arranged close to the radiation plate 44, and the communication characteristic of the field emission antenna 3 is deteriorated due to loss due to the magnetic material. Communication with higher accuracy can be performed in a state where this is prevented. Thereby, the design of the magnetic field radiation type antenna 4 and the design of the electric field radiation type antenna 3 can be performed individually, and both antennas can be designed optimally.

  The magnetic field radiation antenna 4 further includes a radiation plate 44 that is magnetically coupled to the coil 42 and radiates the magnetic field MF. Therefore, the radiation plate 44 that receives the magnetic field generated from the coil 42 and has a larger area than the coil 42. Since the induced current is generated along the edge of the signal line, the loop of the radiated magnetic field MF becomes larger, so that the communication characteristics of communication using the magnetic field radiation type antenna 4 deteriorate even if the coil 42 is downsized. Can be prevented and the communication distance can be extended.

  Further, a shielding plate that shields the magnetic material sheet 43 from electromagnetic waves radiated from the field emission antenna 3 is formed integrally with the radiation plate 44 by another piece 44b formed by bending a part of the radiation plate 44. Thus, it is possible to provide the communication terminal device 1 that can prevent the magnetic sheet 43 and the field emission antenna 3 from being coupled with each other with a simple configuration.

Second Embodiment
A second embodiment of the communication terminal apparatus of the present invention will be described with reference to FIG. FIG. 4 is an enlarged view of a main part of a communication terminal device according to a second embodiment of the present invention, where (a) is a perspective view and (b) is a plan view. This embodiment differs from the first embodiment described above in that the area of the magnetic material sheet 43 is smaller than the area of the piece 44a of the radiation plate 44, as shown in FIGS. In other words, a notch is formed in the other piece 44 b of the radiation plate 44. Since other configurations are the same as those in the first embodiment, description of the configuration is omitted by giving the same reference numerals.

  Even if comprised in this way, since the magnetic material sheet 43 is shielded from the electromagnetic waves radiated from the field emission antenna 3 by the other piece 44b of the radiation plate 44, the same effect as the first embodiment described above can be obtained. Can play. As described above, when the magnetic material sheet 43 is not seen by being shielded by the other piece 44b (shielding plate) of the radiation plate 44 when viewed from the field radiation antenna 3, how the notches are formed in the radiation plate 44. The other piece 44b may be configured, or the radiation plate 44 may be bent to form the other piece 44b.

<Third Embodiment>
A third embodiment of the communication terminal apparatus of the present invention will be described with reference to FIG. FIG. 5 is an enlarged view of a main part of a communication terminal device according to a third embodiment of the present invention, where (a) is a perspective view and (b) is a plan view. This embodiment is different from the first embodiment described above in that the communication terminal device 1 has a communication function of the LTE (Long Term Evolution) standard, and the control is performed as shown in FIGS. The field emission antenna 3 is provided on each side of the substrate 2. In addition, the other end 44b of the radiation plate 44 is formed corresponding to each electric field radiation type antenna 3 by bending both ends of the radiation plate 44, respectively. Since other configurations are the same as those in the first embodiment, description of the configuration is omitted by giving the same reference numerals. In the present embodiment, the LTE standard has been described as an example. However, the present invention is not limited to this, and another communication standard may be provided.

  With this configuration, the magnetic sheet 43 is shielded from electromagnetic waves radiated from the field emission antennas 3 by the other pieces 44b respectively formed at both ends of the radiation plate 44, and thus the first embodiment described above. The same effect as the form can be achieved.

<Fourth embodiment>
A fourth embodiment of the communication terminal apparatus of the present invention will be described with reference to FIG. FIG. 6 is a plan view of a control board of a communication terminal apparatus according to the fourth embodiment of the present invention. This embodiment is different from the first embodiment described above in that the communication terminal device 1 further includes other communication functions such as GPS and Bluetooth. As shown in FIG. The field emission antenna 103 used for communication by the communication function is provided adjacent to the long side of the control board 2. In addition, the radiation plate 44 is bent to form another piece 44 b disposed between the field radiation antennas 3 and 103 and the magnetic sheet 43. Since other configurations are the same as those in the first embodiment, description of the configuration is omitted by giving the same reference numerals.

  With this configuration, the magnetic sheet 43 is shielded from the electromagnetic waves radiated from the field emission antennas 3 and 103 by the other piece 44b formed on the radiation plate 44, and thus the first embodiment described above. The same effect can be achieved.

  As described above, when a plurality of field radiation antennas are arranged close to the magnetic field radiation antenna, the “shielding” of the present invention is provided between each field radiation antenna and the magnetic substance included in the magnetic field radiation antenna. What is necessary is just to arrange | position a board.

<Fifth Embodiment>
5th Embodiment of the communication terminal device of this invention is described with reference to FIG. FIG. 7 is a cutaway side view of the control board of the communication terminal device according to the fifth embodiment of the present invention. This embodiment is different from the first embodiment described above in that the other piece 44b of the radiation plate 44 is bent in a step shape as shown in FIG. Since other configurations are the same as those in the first embodiment, description of the configuration is omitted by giving the same reference numerals.

  Even in this configuration, the magnetic material sheet 43 is shielded from the electromagnetic wave radiated from the field emission antenna 3 by the other piece 44b formed in a step shape on the radiation plate 44. The same effect as the embodiment can be obtained.

<Sixth Embodiment>
A sixth embodiment of the communication terminal apparatus of the present invention will be described with reference to FIG. FIG. 8 is an enlarged view of a main part of a communication terminal device according to a sixth embodiment of the present invention, where (a) is a perspective view, and (b) is a diagram showing a plate-like member before being bent into a radiation plate. It is. This embodiment is different from the first embodiment described above in that a through window 44c is formed in the other piece 44b of the radiation plate 44 as shown in FIGS. 8 (a) and 8 (b). As shown in FIG. 8B, the radiation plate 44 is formed by bending a plate-like member in which the through window 44c is formed along the folding line CL. Since other configurations are the same as those in the first embodiment, description of the configuration is omitted by giving the same reference numerals.

  If comprised in this way, since the penetration window 44c is formed in the other piece 44b of the radiation plate 44, it is in the state which can see the width direction center part of the magnetic material sheet 43 through the penetration window 44c from the electric field radiation type antenna 3. However, since the electromagnetic waves in the high frequency band radiated from the field radiation antenna 3 are radiated from both ends of the field radiation antenna 3, the magnetic sheet 43 is separated from the electromagnetic waves radiated from the field radiation antenna 3. The radiation plate 44 is substantially shielded by the other piece 44b. Therefore, the same effects as those of the first embodiment described above can be obtained.

  As described above, when the electromagnetic wave radiated from the field emission antenna 3 is in a high frequency band, the edge of the through window 44c formed on the other piece 44b of the radiation plate 44 functioning as a shielding plate is closed. In this state, the magnetic sheet 43 can be shielded from the electromagnetic wave radiated from the field emission antenna 3 by the other piece 44b in which the through window 44c is formed. Further, as shown in FIG. 8B, by forming the through window 44c in the plate-like member, the plate-like member can be easily bent along the folding line CL.

<Seventh embodiment>
A seventh embodiment of the communication terminal apparatus of the present invention will be described with reference to FIG. FIG. 9 is an enlarged view of a main part of a communication terminal device according to a seventh embodiment of the present invention, where (a) is a perspective view, (b) is a plan view, and (c) is bent into a radiation plate. It is a figure which shows the plate-shaped member. This embodiment is different from the first embodiment described above in that the radiation plate 144 has a coil shape as shown in FIGS. Since other configurations are the same as those in the first embodiment, description of the configuration is omitted by giving the same reference numerals.

  As shown in FIG. 9 (c), the radiation plate 144 is formed by bending a plate-like member whose one piece 144a side is formed into a spiral coil shape along a fold line CL at a substantially right angle. In addition, at both ends 144a1 and 144a2 on the side of the piece 144a of the radiation plate 144 processed into a spiral coil shape, the capacitance is such that the resonance frequency of the one piece side 144a forming the coil shape substantially coincides with the resonance frequency of the coil 42. (Not shown) is provided. 9A and 9B, the radiation plate 144 is controlled so that the other piece 144b of the radiation plate 144 is disposed between the magnetic sheet 43 and the field radiation antenna 3. It is provided on the substrate 2. In addition, the radiation plate 144 processed into the coil shape is not only one in which capacitance is provided at both ends 144a1 and 144a2 of the one side 144a, but a coil pattern is formed on both surfaces of the insulator base material. Also included are those in which the coil pattern is capacitively coupled through an insulator substrate.

  If comprised in this way, since the magnetic material sheet 43 will be shielded by the other piece 144b of the radiation plate 144 from the electromagnetic waves radiated | emitted from the field radiation type | mold antenna 3, it can have an effect similar to above-described 1st Embodiment. . Further, since the radiation plate 144 is coiled, the magnetic field generated in the coil 42 can be increased and amplified more efficiently. Further, the radiation plate 144 is provided with a capacitance so that the resonance frequency of the piece 144a of the radiation plate 144 having a coil shape substantially matches the resonance frequency of the coil 42, that is, the frequency of the HF band used for communication by RFID. Therefore, the magnetic field generated in the coil 42 can be increased and amplified more efficiently.

<Eighth Embodiment>
An eighth embodiment of the communication terminal apparatus of the present invention will be described with reference to FIG. FIG. 10 is a cut side view of the control board of the communication terminal device according to the eighth embodiment of the present invention. This embodiment is different from the first embodiment described above in that no radiation plate is provided and a shielding plate 142a is formed by a part of the coil 142, as shown in FIG. The shielding plate 142a is disposed between the magnetic sheet 43 and the field emission antenna 3, so that the magnetic sheet 43 is shielded from the electromagnetic waves radiated from the field emission antenna 3 by the shielding plate 142a. The Since other configurations are the same as those in the first embodiment, description of the configuration is omitted by giving the same reference numerals.

  If comprised in this way, since the magnetic material sheet 43 will be shielded by the shielding board 142a from the electromagnetic waves radiated | emitted from the field radiation type antenna 3, there can exist an effect similar to above-described 1st Embodiment.

  Note that the present invention is not limited to the above-described embodiment, and various modifications other than those described above can be made without departing from the spirit of the present invention. For example, in the first to seventh embodiments described above, the “shielding plate” of the present invention is formed by the other pieces 44b and 144b formed integrally with the radiation plates 44 and 144, and the eighth embodiment described above. Then, the shielding plate 142a is formed integrally with the coil 142, but the shielding plate may be formed separately from the radiation plate and the coil. That is, if the magnetic sheet 43 can be shielded from electromagnetic waves radiated from the field radiation antenna 3 by arranging a shielding plate between the magnetic sheet 43 and the field radiation antenna 3, The “shielding plate” may be configured in any manner.

  In the first to seventh embodiments described above, the coil 42 (magnetic sheet 43) and the radiation plates 44 and 144 are provided on the control board 2. However, in recent years, the communication terminal device 1 has become thinner, Since the control board 2 is disposed close to the inner wall of the housing 1a, the radiation plates 44 and 144 may be provided on the inner wall of the housing 1a with the coil 42 (magnetic material sheet 43) provided on the control board 2. The coil 42 (magnetic sheet 43) may be provided on the inner wall of the housing 1a with the radiation plates 44 and 144 provided on the control board 2. The radiation plate may be formed by evaporating a nonmagnetic metal such as Al on the housing 1a.

  For example, as shown in FIG. 11, the base substrate 41 of the magnetic field radiation antenna 104 formed without using a radiation plate is provided by providing the coil 42 (magnetic sheet 43) on the base substrate 41. You may stick to the inner wall of the body 1a with an adhesive agent. In this case, a screen-shaped shielding plate 10 may be disposed between the field radiation antenna 3 and the magnetic field radiation antenna 4 (magnetic material sheet 43). In addition, FIG. 11 is a figure which shows the modification of the communication terminal device of this invention.

  In addition, the communication function provided in the communication terminal device 1 is not limited to the above-described example, and various communication functions such as a wireless LAN such as One Seg or WiFi may be installed in the communication terminal device 1. In addition, the magnetic material has a characteristic that the impedance increases in the high frequency region, and in particular, since the loss of electromagnetic waves due to the magnetic material increases in the high frequency band, the field emission antenna has a high frequency band (about 400 MHz). When used for the used communication, the above-described effects can be particularly remarkably exhibited.

  In addition, conventional shielding plates that shield electromagnetic waves can eliminate the effects of electromagnetic waves on electronic components by preventing (blocking) electromagnetic waves, and prevent electromagnetic waves emitted from electronic components from interfering with other components. However, the shielding plate used in the above-described embodiment is the maximum that is used based on a different idea of preventing electromagnetic waves radiated from the field emission antenna from deteriorating. It is a feature.

  The present invention can be widely applied to communication terminal devices including a magnetic field radiation antenna having a coil provided with a magnetic body and a field radiation antenna.

DESCRIPTION OF SYMBOLS 1 Communication terminal device 3,103 Electric field radiation type antenna 4,104 Magnetic field radiation type antenna 10 Shielding plate 42,142 Coil 43 Magnetic material sheet 44,144 Radiation plate 44b, 144b Other piece (shielding plate)
142a Shield plate

Claims (3)

A magnetic field radiation antenna having a coil provided with a magnetic material;
A field emission antenna;
A shield that is formed of a non-magnetic conductive material and is disposed between the magnetic body of the magnetic field radiation antenna and the field radiation antenna and shields the magnetic body from electromagnetic waves radiated from the field radiation antenna. A communication terminal device comprising: a board. The magnetic field radiation antenna further includes a radiation plate that magnetically couples with the coil to radiate a magnetic field, and the radiation plate is disposed between the magnetic body and the field radiation antenna by being partially bent. Has been
The communication terminal apparatus according to claim 1, wherein the shielding plate is formed by a part of the radiation plate disposed between the magnetic body and the field emission antenna.   The communication terminal device according to claim 2, wherein the radiation plate has a coil shape.

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