Source: https://patents.google.com/patent/WO2013011856A1/en
Timestamp: 2019-11-14 12:54:18
Document Index: 451094390

Matched Legal Cases: ['art 11', 'art 11', 'art 11', 'art 13', 'art 11', 'art 11', 'art 20']

WO2013011856A1 - Wireless communication device - Google Patents
WO2013011856A1
WO2013011856A1 PCT/JP2012/067454 JP2012067454W WO2013011856A1 WO 2013011856 A1 WO2013011856 A1 WO 2013011856A1 JP 2012067454 W JP2012067454 W JP 2012067454W WO 2013011856 A1 WO2013011856 A1 WO 2013011856A1
coil pattern
loop portion
PCT/JP2012/067454
2011-07-15 Priority to JP2011156664 priority Critical
2011-07-15 Priority to JP2011-156664 priority
2012-07-09 Application filed by 株式会社村田製作所 filed Critical 株式会社村田製作所
2013-01-24 Publication of WO2013011856A1 publication Critical patent/WO2013011856A1/en
A wireless communication device, which is small, and has a long communication distance and stable frequency characteristics, is obtained. This wireless communication device is provided with: a planar radiation element that includes a loop portion (11) having one end portion (11a) and the other end portion (11b); a power supplying element (20), which includes a coil pattern (L1) connected to the one end portion (11a) of the loop portion (11); and a wireless IC element (30) connected to the coil pattern (L1). The coil pattern (L1) is disposed in the vicinity of the loop portion (11), and is wound such that a current (I1) that flows in the coil pattern (L1) and a current (I3) that flows in the loop portion (11) are in the same direction when power is supplied to the coil pattern (L1). The coil pattern (L1) and the loop portion (11) are connected in series, and are coupled with each other via a magnetic field.
The present invention relates to a wireless communication device, and more particularly to a wireless communication device used for communication with a reader / writer in an RFID (Radio Frequency Identification) system.
2. Description of the Related Art Recently, an RFID information system for communicating predetermined information by communicating a reader / writer and an RFID tag (also referred to as a wireless communication device) attached to an article in a non-contact manner has been put into practical use as an article information management system. Reader / writers and RFID tags each include a radiating element (antenna) for transmitting and receiving wireless signals. As the RFID system, an HF band system using a high frequency of 13.56 MHz band and a UHF band system using a high frequency of 900 MHz band are typical.
For HF band systems, RFID tags and reader / writer antennas are usually configured with coil antennas. Both coil antennas are coupled mainly via an induction magnetic field. That is, a radio signal is transmitted via a near magnetic field.
By the way, in recent years, as described in Patent Documents 1 and 2 and the like, it has been proposed to mount a coil antenna on a communication terminal such as a mobile phone and use the communication terminal itself as a reader / writer or an RFID tag. .
However, as described in Patent Documents 1 and 2, since the size of the coil antenna for the HF band system is large, a large space for installing the antenna is required in the housing of the terminal device. Further, the housing of the communication terminal is provided with a liquid crystal display panel, a keyboard, an RF circuit board, a battery pack, and the like, and formation of an induction magnetic field in the coil antenna is hindered by metal objects attached to these components. As a result, the resonance frequency of the coil antenna may fluctuate and a sufficient communication distance may not be ensured.
JP 2006-270681 A International Publication No. 2007/060792
Therefore, an object of the present invention is to provide a wireless communication device that is small in size, has a long communication distance, and has stable frequency characteristics.
A wireless communication device according to one aspect of the present invention is provided.
A radiating element having a planar shape including a loop portion having one end and the other end;
A power feeding element including a coil pattern connected to the one end of the loop portion;
A wireless IC element connected to the coil pattern;
In a wireless communication device comprising:
The coil pattern is disposed in the vicinity of the loop portion, and the current flowing through the coil pattern and the current flowing through the loop portion are in the same direction when power is supplied to the coil pattern. Is wound,
The coil pattern and the loop portion are connected in series and are coupled via a magnetic field,
In the wireless communication device, the coil pattern is wound such that when power is supplied, the current flowing through the coil pattern and the current flowing through the loop portion of the planar radiating element are in the same direction, and Since the coil pattern and the loop portion are coupled via a magnetic field, when a current is supplied to the wireless IC element, the induced magnetic field generated in the coil pattern and the induced magnetic field generated in the loop portion strengthen each other. As a result, an induced current flows through substantially the entire planar radiating element, and a high-frequency signal is radiated from the entire planar radiating element. On the other hand, since the frequency characteristic of the radiating element is substantially determined by the size of the loop portion and the inductance value of the coil pattern, there is little influence on the frequency characteristic due to the metal object arranged in proximity. Therefore, the wireless communication device is small, has a long communication distance, and stabilizes frequency characteristics.
According to the present invention, it is possible to obtain a wireless communication device that is small in size, has a long communication distance, and has stable frequency characteristics.
The wireless communication device which is 1st Example is shown, (A) is a top view, (B) is an enlarged plan view of the principal part. It is an equivalent circuit diagram of the wireless communication device. It is a disassembled perspective view which shows the electric power feeding element (coil pattern) which comprises the said wireless communication device. It is a top view which decomposes | disassembles and shows the said electric power feeding element (coil pattern) for every base material layer. It is a chart figure which shows the magnetic field strength of the said radio | wireless communication device. It is a Smith chart figure which shows the resonant frequency characteristic in the said radio | wireless communication device. It is a top view which shows the principal part of the radio | wireless communication device which is 2nd Example. It is a top view which shows the principal part of the radio | wireless communication device which is 3rd Example. It is the equivalent circuit schematic of the radio | wireless communication device which is 4th Example.
Embodiments of a wireless communication device according to the present invention will be described below with reference to the accompanying drawings. In each figure, common parts and portions are denoted by the same reference numerals, and redundant description is omitted.
(Overview of wireless communication device)
First, the outline of the wireless communication device according to the present invention will be described. The wireless communication device includes a planar radiating element including a loop portion having one end and another end adjacent to each other, a power feeding element including a coil pattern connected to one end of the loop, and the coil pattern. And a connected wireless IC element. The coil pattern is arranged in the vicinity of the loop portion, and is wound so that the current flowing in the coil pattern and the current flowing in the loop portion are in the same direction when power is supplied to the coil pattern. The coil pattern and the loop portion are connected in series and are coupled via a magnetic field.
The planar radiating element functions as an antenna for transmitting and receiving radio signals and can be formed of a metal conductor. For example, it is preferable to use a ground conductor or the like provided on the printed wiring board. If the housing of the communication terminal is made of metal, this metal housing may be used as the radiating element, or the metal protective film of the battery pack may be used as the radiating element. The planar shape may be a plane, a curved surface, a rectangle, an ellipse or a polygon.
The loop portion is formed in a part of the planar radiating element, and is formed as an annular conductive pattern having one end and the other end. It is advantageous in terms of processing and space to form the loop portion by the edge portion formed by cutting out a part of the planar radiating element. A loop portion may be formed by adding a loop-shaped conductor to one side of the radiation element having a rectangular planar shape.
The wireless IC element is an integrated circuit element for processing a high-frequency signal, and includes a logic circuit, a memory circuit, and the like, and necessary information is stored in the memory. It may be configured as a chip element made of a silicon semiconductor. A package product mounted on or built in a ceramic substrate or a resin substrate may be used, or a bare chip may be used. When using a ceramic substrate or a resin substrate, a matching circuit or a resonance circuit may be provided on the surface or inside of the substrate.
The power feeding element has at least one coil pattern and is connected between the wireless IC element and the radiation element. That is, the high frequency signal received by the radiating element is supplied to the wireless IC element, and the high frequency signal generated by the wireless IC element is transmitted to the radiating element. The coil pattern is connected to one end of the loop portion. That is, when the wireless IC element is a differential feeding type, the first feeding terminal of the wireless IC element is connected to one end of the coil pattern, and the other end of the coil pattern is connected to one end of the loop part. Furthermore, the other end of the loop portion is connected to the second power supply terminal of the wireless IC element via the power supply element.
The power feeding element may further include a capacitor connected in parallel to the wireless IC element. In this case, an LC resonance circuit is formed by the capacitor and the coil pattern (inductor). Moreover, it is preferable that the power feeding element is constituted by a laminated body formed by laminating a plurality of insulator layers as an element body, and the coil pattern is preferably incorporated in the laminated body in a spiral shape. As the insulator layer, a ceramic material such as LTCC ceramic can be used, and a resin material such as a thermosetting resin or a thermoplastic resin can also be used. The element body may be a dielectric layer or a magnetic layer. However, when a magnetic layer is used, it is preferable that a part of the coil pattern is exposed on the surface of the laminated body because an induced magnetic field due to the coil pattern is easily confined in the magnetic body. In addition to the coil pattern, a conductor pattern such as a mounting land and a connection wiring is provided on the laminate constituting the power feeding element. This type of conductor pattern is preferably formed of a metal material mainly composed of silver or copper having a small specific resistance.
In the laminate, a conductor pattern that prevents coupling via a magnetic field between the coil pattern and the loop portion, more specifically, in a region where the opening surface of the coil pattern and the loop surface of the loop portion overlap. It is preferable not to have. In particular, a planar conductor pattern that blocks the entire opening surface of the coil pattern prevents magnetic coupling between the coil pattern and the loop portion. Note that the wireless IC element does not have to be mounted on the surface of the laminated body that constitutes the power feeding element, and may be built in the laminated body or may be provided in an element body other than the laminated body.
Furthermore, in the wireless communication device, the coil pattern is electrically connected in series to the loop portion of the radiating element and coupled via a magnetic field. That is, the coil pattern and the loop portion are directly connected to DC and are connected via mutual inductance. For this reason, it is preferable that the winding axis of the coil pattern is arranged in substantially the same direction as the central axis of the loop portion. Furthermore, the coil pattern is preferably disposed inside the loop portion in plan view.
The coil pattern is wound such that when power is supplied to the coil pattern, the current flowing in the coil pattern and the current flowing in the loop portion are in the same direction (in phase). Therefore, when a current is supplied from the wireless IC element, the induced magnetic field generated in the coil pattern and the induced magnetic field generated in the loop portion have a common magnetic field loop. An induced current flows through almost the entire radiating element, and a high-frequency signal is radiated from the entire planar radiating element. On the other hand, since the frequency characteristic of the radiating element is substantially determined by the size of the loop portion and the inductance value of the coil pattern, there is little influence on the frequency characteristic due to the metal object arranged in proximity. Therefore, the wireless communication device is small, has a long communication distance, and stabilizes frequency characteristics.
The inductance value of the coil pattern is preferably larger than the inductance value formed by the loop portion. If the inductance value of both is such a relationship, the resonance frequency of the system including the coil pattern and the loop portion is dominated by the inductance value of the coil pattern, and the frequency characteristics are the size of the loop portion and the loop portion (and more It becomes difficult to be influenced by the external environment of the radiating element.
The feeding element may include another coil pattern connected to the other end of the loop portion. The other coil pattern is arranged in the vicinity of the loop portion, and when power is supplied to the other coil pattern, the current flowing in the coil pattern and the current flowing in the loop portion are in the same direction (in phase). It is wound to become. The other coil pattern has its winding axis arranged in the same direction as the center axis of the loop portion, and the coil pattern is adjacent to the coil pattern in substantially the same position in plan view. Preferably, they are arranged and coupled to each other via a magnetic field. In other words, if there is another coil pattern coupled to the coil pattern via mutual inductance, the element value of the coil pattern necessary to obtain a predetermined resonance frequency can be reduced, and the power supply element can be reduced in size. Can be achieved. In particular, it is preferable that the phase difference is 180 ° at one end and the other end of the loop portion when the operating frequency increases. By connecting the coil pattern and the other coil pattern to one end and the other end of the loop part, a maximum current point is formed in the loop part, and a voltage maximum point having a phase difference of 180 ° is formed at both ends of the coil part. Therefore, the symmetry can be improved and the shift of the phase difference can be suppressed.
The wireless communication device according to the present invention is suitable as a reader / writer or RFID tag for an RFID system used in the HF band. However, the application can be widely applied not only to the HF band but also to the UHF band RFID system and communication systems such as W-LAN and BlueTooth (registered trademark). In particular, since a ground conductor can be used as a radiating element and a reduction in size can be realized, it has a great advantage for mounting in a wireless communication terminal such as a mobile phone.
(Refer to the first embodiment, FIGS. 1 to 6)
As shown in FIGS. 1 and 2, the wireless communication device 1A according to the first embodiment includes a radiating element 10 having a planar shape including a loop portion 11 having one end portion 11a and another end portion 11b adjacent to each other, and a loop. The feeding element 20 includes coil patterns L1 and L2 (see FIG. 2) connected to one end 11a and the other end 11b of the part 11 and capacitors C1 and C2 connected in series to the other ends of the coil patterns L1 and L2, respectively. And a wireless IC element 30 connected to the other ends of the coil patterns L1, L2. The coil patterns L1 and L2 are arranged in the vicinity of the loop portion 11, and currents I1 and I2 (see FIG. 2) that flow through the coil patterns L1 and L2 when power is supplied to the coil patterns L1 and L2. The coil is wound so that the current I3 flowing through the loop part 11 is in the same direction, and the coil patterns L1, L2 and the loop part 11 are connected in series. The coil patterns L1 and L2 are magnetically coupled M2, and the coil patterns L1 and L2 and the loop portion 11 are also magnetically coupled M1 to each other.
The planar radiating element 10 functions as an antenna for transmitting and receiving a radio signal. In the first embodiment, a ground conductor provided on the printed wiring board 5 is used. The loop portion 11 is formed by an edge portion formed by cutting out a part of the planar radiating element 10.
The wireless IC element 30 is an integrated circuit element for processing a high-frequency signal, and is a known element that includes a logic circuit, a memory circuit, and the like and stores necessary information. The first power supply terminal 31 of the wireless IC element 30 is connected to the other end of the coil pattern L1, and the second power supply terminal 32 is connected to the other end of the coil pattern L2.
The power feeding element 20 is connected between the wireless IC element 30 and the radiating element 10, supplies a high frequency signal received by the radiating element 10 to the wireless IC element 30, and generates a high frequency signal generated by the wireless IC element 30. Is transmitted to the radiating element 10. In the power feeding element 20, an LC resonance circuit is formed by the capacitors C1 and C2 and the coil patterns (inductors) L1 and L2.
The feeding element 20 is configured by using a laminated body 21 formed by laminating a plurality of insulating layers as a base body. The coil patterns L1 and L2 are spirally incorporated in the multilayer body 21, and the wireless IC element 30 and the capacitors C1 and C2 are mounted on the upper surface of the multilayer body 21.
Here, the configuration of the laminate 21 (laminate structure of the coil patterns L1 and L2) will be described with reference to FIGS. The laminate 21 is obtained by laminating, pressing, and firing the sheets 22a to 22h shown in FIG. 4 as necessary.
In the sheet 22a, electrodes 23a to 23h and via hole conductors 27a to 27f are formed. Conductive patterns 24a and 25 and via-hole conductors 27a and 27g are formed on the sheet 22b. Conductive patterns 24b to 24f and via-hole conductors 27g and 27h are formed on the sheets 22c to 22g. On the sheet 22h, electrodes 26a to 26d (formed on the back surface) and via-hole conductors 27g and 27h are formed.
By sequentially laminating the sheets 22a to 22h with the sheet 22h as the lowermost layer and the sheet 22a as the uppermost layer, the electrode 23a on the sheet 22a is connected to the conductor patterns 25 and 24b via the via-hole conductors 27a. Is connected to the conductor pattern 25 via the via hole conductor 27b, the electrode 23d is connected to the conductor pattern 25 via the via hole conductor 27c, the electrode 23e is connected to the conductor pattern 24a via the via hole conductor 27d, and the electrode 23f is connected to the via hole. The conductor 27e is connected to the conductor pattern 24a, and the electrode 23h is connected to the conductor pattern 24a via the via-hole conductor 27f.
Furthermore, one end of the conductor pattern 24a on the sheet 22b is connected to the electrode 26b formed on the back surface of the sheet 22h via the via-hole conductor 27g. The other end of the conductor pattern 24b on the sheet 22c is spirally connected to the conductor patterns 24c to 24f via the via-hole conductor 27h. The other end of the conductor pattern 24f on the sheet 22g is connected to an electrode 26a formed on the back surface of the sheet 22h through a via-hole conductor 27h. The electrodes 23c, 23g, 26c, and 26d formed on the sheets 22a and 22h are floating electrodes for mounting.
In the laminate 21 configured as described above, the coil pattern L1 is formed by the conductor patterns 24b to 24f, and the coil pattern L2 is formed by the conductor pattern 24a. The details of the conductor pattern 25 on the sheet 22b and the conductor pattern 24a facing the pattern 25 function as a routing pattern.
In the power feeding element 20 made of the laminate 21, the first power feeding terminal 31 and the second power feeding terminal 32 of the wireless IC element 30 are connected to the electrodes 23b and 23f, the capacitor C1 is connected to the electrodes 23a and 23e, and the electrodes 23d, The capacitor C2 is connected to 23h. The electrode 26 a is connected to one end 11 a of the loop portion 11, the electrode 26 b is connected to the other end 11 b of the loop portion 11, and the electrodes 26 c and 26 d are mounting electrodes 11 c formed in the inner region of the loop portion 11. 11d (see FIG. 1B).
In the wireless communication device 1A configured as described above, when power is supplied to the coil patterns L1 and L2, the currents I1 and I2 flowing through the coil patterns L1 and L2 and the current I3 flowing through the loop portion 11 are in the same direction ( Therefore, when a current is supplied from the wireless IC element 30, the induced magnetic field generated in the coil patterns L1 and L2 and the induced magnetic field generated in the loop portion 11 strengthen each other. As a result, an induced current I4 (see FIG. 1A) flows through almost the entire radiating element 10, and a high-frequency signal is radiated from the entire radiating element 10. On the other hand, since the frequency characteristic of the radiating element 10 is substantially determined by the size of the loop portion 11 and the inductance values of the coil patterns L1 and L2, there is little influence on the frequency characteristic due to the metal objects arranged in proximity. Therefore, the wireless communication device 1A is small, has a long communication distance, and stabilizes frequency characteristics.
FIG. 5 schematically shows the magnetic field strength in the wireless communication device 1A. The x, y, and z directions correspond to the x, y, and z directions starting from the loop portion 11 shown in FIG. 1A, and the cross hatching density is drawn higher in the region where the magnetic field strength is larger. FIG. 6 shows a resonance frequency characteristic in the wireless communication device 1A, and the point A is a resonance point.
In the wireless communication device 1A, the coil patterns L1 and L2 have winding axes arranged in the same direction as the central axis of the loop portion 11, and the coil patterns L1 and L2 are located inside the loop portion 11 in plan view. Since they are arranged, the coupling via the mutual inductance M1 is strengthened.
The inductance value of the coil pattern L1 is set to be larger than the inductance value formed by the loop portion 11. If the inductance values of the two are such a relationship, the resonance frequency of the system including the coil pattern L1 and the loop portion 11 is dominated by the inductance value of the coil pattern L1, and the frequency characteristics are the size of the loop portion 11 and the loop. It is not affected by the external environment of the part (and the radiating element 10).
(Refer to the second embodiment, FIG. 7)
As shown in FIG. 7, the wireless communication device 1 </ b> B according to the second embodiment is provided with a coil portion 13 between the other end portion 11 b of the loop portion 11 and the radiating element 10. The coil portion 13 has an outermost peripheral portion connected to the other end portion 11 b and an innermost peripheral portion connected to one end of a conductor pattern 6 formed on the back surface of the printed wiring board 5 via a via-hole conductor 7 a. The end is connected to the radiating element 10 via the via-hole conductor 7b. The radiating element 10 may be formed on the back side of the printed wiring board 5.
This wireless communication device 1B has the same configuration as that of the wireless communication device 1A according to the first embodiment except for the above-described configuration, and the operation and effect thereof are basically the same as those of the wireless communication device 1A. Not only can the frequency characteristics of the wireless communication device 1B be adjusted by the coil part 13, but also the potential difference between the one end part 11a and the other end part 11b is increased, so that the energy radiated from the radiating element 10 can be increased.
(Refer to the third embodiment, FIG. 8)
As shown in FIG. 8, the wireless communication device 1C according to the third embodiment is formed by forming a slit-like cutout portion 12 in the loop portion 11, and the other configuration is the wireless communication according to the first embodiment. It is the same as that of the device 1A, and its operation effect is basically the same. In particular, the inductance value of the loop portion 11 can be adjusted by the notch portion 12.
(Refer to the fourth embodiment, FIG. 9)
A wireless communication device 1D according to the fourth embodiment is obtained by omitting the coil pattern L2 from the wireless communication device 1A according to the first embodiment as shown in the equivalent circuit of FIG. Other configurations are the same as those of the wireless communication device 1A according to the first embodiment, and the operational effects are basically the same.
In this wireless communication device 1D, the resonance frequency f 0 is determined by the following equation (1).
f 0 = 1 / {2π√ (L 1 + L + 2M)} (1)
L 1 : Inductance value of the coil pattern L 1 L: Inductance value of the loop part M = k√ (L 1 L)
The wireless communication device according to the present invention is not limited to the above-described embodiments, and can be variously modified within the scope of the gist.
As described above, the present invention is useful for a wireless communication device, and is particularly excellent in that it is small in size, has a long communication distance, and has stable frequency characteristics.
DESCRIPTION OF SYMBOLS 1A-1D ... Wireless communication device 5 ... Printed wiring board 10 ... Radiation element 11 ... Loop part 20 ... Feeding element 21 ... Laminate 30 ... Wireless IC element L1, L2 ... Coil pattern C1, C2 ... Capacitor
A radiating element having a planar shape including a loop portion having one end portion and the other end portion;
A wireless communication device.
The wireless communication device according to claim 1, wherein the coil pattern has a winding axis disposed in substantially the same direction as a central axis of the loop portion.
The wireless communication device according to claim 1 or 2, wherein the coil pattern is disposed inside the loop portion in plan view.
The wireless communication device according to any one of claims 1 to 3, wherein an inductance value of the coil pattern is larger than an inductance value formed by the loop portion.
The wireless communication device according to any one of claims 1 to 4, wherein the loop portion is configured by an edge portion formed by cutting out a part of the radiating element.
6. The wireless communication device according to claim 1, wherein the radiation element is a ground conductor provided on a printed wiring board.
The wireless communication device according to any one of claims 1 to 6, wherein the power feeding element further includes a capacitor connected in parallel to the wireless IC element.
8. The feed element according to claim 1, wherein the power feeding element includes a laminated body formed by laminating a plurality of insulator layers, and the coil pattern is spirally incorporated in the laminated body. The wireless communication device according to any one of the above.
The wireless communication device according to any one of claims 1 to 8, wherein a conductor pattern that prevents coupling via a magnetic field is not provided between the coil pattern and the loop portion.
The feeding element includes another coil pattern connected to the other end of the loop portion,
The another coil pattern is disposed in the vicinity of the loop portion, and when power is supplied to the other coil pattern, the current flowing in the one coil pattern and the current flowing in the loop portion are Are wound in the same direction,
The wireless communication device according to claim 1, wherein:
11. The wireless communication device according to claim 10, wherein the winding axis of the another coil pattern is arranged in substantially the same direction as the central axis of the loop portion.
12. The radio according to claim 10, wherein the coil pattern and the another coil pattern are arranged such that respective winding axes are adjacent to each other at substantially the same position in plan view. Communication device.
PCT/JP2012/067454 2011-07-15 2012-07-09 Wireless communication device WO2013011856A1 (en)
JP2011156664 2011-07-15
JP2011-156664 2011-07-15
DE112012001977.6T DE112012001977T5 (en) 2011-07-15 2012-07-09 Radio communication equipment
JP2013523798A JP5333707B2 (en) 2011-07-15 2012-07-09 Wireless communication device
CN201280008674.5A CN103370886B (en) 2011-07-15 2012-07-09 The wireless communication device
US14/027,384 US8770489B2 (en) 2011-07-15 2013-09-16 Radio communication device
US14/027,384 Continuation US8770489B2 (en) 2011-07-15 2013-09-16 Radio communication device
WO2013011856A1 true WO2013011856A1 (en) 2013-01-24
ID=47558034
PCT/JP2012/067454 WO2013011856A1 (en) 2011-07-15 2012-07-09 Wireless communication device
US (1) US8770489B2 (en)
JP (1) JP5333707B2 (en)
CN (1) CN103370886B (en)
DE (1) DE112012001977T5 (en)
WO (1) WO2013011856A1 (en)
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