GB2470299A - Compact coil antenna with a planar magnetic core - Google Patents
Compact coil antenna with a planar magnetic core Download PDFInfo
- Publication number
- GB2470299A GB2470299A GB1008206A GB201008206A GB2470299A GB 2470299 A GB2470299 A GB 2470299A GB 1008206 A GB1008206 A GB 1008206A GB 201008206 A GB201008206 A GB 201008206A GB 2470299 A GB2470299 A GB 2470299A
- Authority
- GB
- United Kingdom
- Prior art keywords
- coil
- coil conductor
- magnetic
- antenna
- material core
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 239000004020 conductor Substances 0.000 claims abstract description 105
- 239000000696 magnetic material Substances 0.000 claims abstract description 45
- 239000000758 substrate Substances 0.000 claims abstract description 25
- 230000008878 coupling Effects 0.000 abstract description 13
- 238000010168 coupling process Methods 0.000 abstract description 13
- 238000005859 coupling reaction Methods 0.000 abstract description 13
- 238000004088 simulation Methods 0.000 description 3
- 230000003247 decreasing effect Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000004907 flux Effects 0.000 description 2
- 230000035699 permeability Effects 0.000 description 2
- 230000005672 electromagnetic field Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000004804 winding Methods 0.000 description 1
- 229910000859 α-Fe Inorganic materials 0.000 description 1
Classifications
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06K—GRAPHICAL DATA READING; PRESENTATION OF DATA; RECORD CARRIERS; HANDLING RECORD CARRIERS
- G06K19/00—Record carriers for use with machines and with at least a part designed to carry digital markings
- G06K19/06—Record carriers for use with machines and with at least a part designed to carry digital markings characterised by the kind of the digital marking, e.g. shape, nature, code
- G06K19/067—Record carriers with conductive marks, printed circuits or semiconductor circuit elements, e.g. credit or identity cards also with resonating or responding marks without active components
- G06K19/07—Record carriers with conductive marks, printed circuits or semiconductor circuit elements, e.g. credit or identity cards also with resonating or responding marks without active components with integrated circuit chips
- G06K19/077—Constructional details, e.g. mounting of circuits in the carrier
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q1/00—Details of, or arrangements associated with, antennas
- H01Q1/12—Supports; Mounting means
- H01Q1/22—Supports; Mounting means by structural association with other equipment or articles
- H01Q1/2208—Supports; Mounting means by structural association with other equipment or articles associated with components used in interrogation type services, i.e. in systems for information exchange between an interrogator/reader and a tag/transponder, e.g. in Radio Frequency Identification [RFID] systems
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q1/00—Details of, or arrangements associated with, antennas
- H01Q1/36—Structural form of radiating elements, e.g. cone, spiral, umbrella; Particular materials used therewith
- H01Q1/38—Structural form of radiating elements, e.g. cone, spiral, umbrella; Particular materials used therewith formed by a conductive layer on an insulating support
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q7/00—Loop antennas with a substantially uniform current distribution around the loop and having a directional radiation pattern in a plane perpendicular to the plane of the loop
- H01Q7/06—Loop antennas with a substantially uniform current distribution around the loop and having a directional radiation pattern in a plane perpendicular to the plane of the loop with core of ferromagnetic material
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q7/00—Loop antennas with a substantially uniform current distribution around the loop and having a directional radiation pattern in a plane perpendicular to the plane of the loop
- H01Q7/06—Loop antennas with a substantially uniform current distribution around the loop and having a directional radiation pattern in a plane perpendicular to the plane of the loop with core of ferromagnetic material
- H01Q7/08—Ferrite rod or like elongated core
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q9/00—Electrically-short antennas having dimensions not more than twice the operating wavelength and consisting of conductive active radiating elements
- H01Q9/04—Resonant antennas
- H01Q9/16—Resonant antennas with feed intermediate between the extremities of the antenna, e.g. centre-fed dipole
- H01Q9/26—Resonant antennas with feed intermediate between the extremities of the antenna, e.g. centre-fed dipole with folded element or elements, the folded parts being spaced apart a small fraction of operating wavelength
- H01Q9/27—Spiral antennas
Landscapes
- Engineering & Computer Science (AREA)
- Computer Hardware Design (AREA)
- Microelectronics & Electronic Packaging (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Theoretical Computer Science (AREA)
- Details Of Aerials (AREA)
- Coils Or Transformers For Communication (AREA)
Abstract
A coil antenna comprises a conductive coil 11 formed on a substrate 10 and a planar magnetic material core 1, where the interval between coil members PA extending parallel to an axis of the core 1 is smaller than coil members CA extending orthogonally to the said magnetic core axis. The coil conductor 11 may be formed in multiple layers and the coil members PA which are parallel to the said core axis may be arranged superposed on one another. The coil conductor 11 may form a rectangular shaped spiral pattern around an opening CW in a flexible substrate 10. The planar magnetic core 1 may be arranged to extend through the said opening CW in the substrate. Alternatively, the flexible substrate 10 and coil conductor pattern 11 may be folded to wrap the magnetic core 1. The compact coil antenna is intended to provide a higher degree of coupling with a target antenna even when it is located close to a conductive plate.
Description
I
COIL ANTENNA
[Technical Field]
[0001] The present invention relates to a coil antenna used in, for example, a Radio Frequency Identification (REID) system that cormunicates with an external device by using
electromagnetic field signals.
[Background Art]
[0002] Coil antennas mounted in mobile electronic devices used in REID systems are disclosed in, for example, Japanese Unexamined Patent Application Publication No. 2002-325013 (Patent Document 1), Japanese Unexamined Patent Application Publication No. 2002-373319 (Patent Document 2), and Japanese Unexamined Patent Application No. 2005-94319 (Patent Document 3).
Fig. 1 is a top view illustrating the structure of an antenna coil described in Patent Document 1. An antenna coil 30 illustrated in Fig. 1 includes an air core coil 32 and a planar magnetic core member 33. The air core coil 32 is configured by spirally winding conductors 31 (31a, 31b, 31e, and 3ld) in a plane on a film 32a. The magnetic core member 33 is inserted into the air core coil 32 so as to be substantially parallel to a plane of the air core coil 32.
The air core coil 32 has an aperture 32d and the magnetic core member 33 is inserted into the aperture 32d. A first terminal 31a is connected to a connecting conductor 31e via a through hole 32b, and a second terminal 31b is connected to the connecting conductor 3le via a through hole 32c. And, the magnetic-material antenna is arranged on a conductive plate 34.
[0003] In an antenna coil disclosed in Patent Document 2, an antenna magnetic core, which is a planar body, is arranged so as to configure substantially the same plane as the antenna coil while passing through an air core unit of the antenna coil.
[0004] In a coil antenna disclosed in Patent Document 3, multiple coils wound on a plane are arranged in multiple layers around the same central axis, the coils on the respective layers are connected in series to each other, and a member of a high permeability is provided between the coils on the respective layers.
[0005]
[Summary of the Invention}
[0006] In general, the characteristics as a coil antenna are improved and its communication performance is also improved as the number of turns of the coil is increased, the loss of
S
the coil is decreased, and the width of the magnetic core is increased, as long as an inductance necessary for the resonation at a predetermined resonant frequency is achieved.
However, there are the following problems in the coil antennas disclosed in Patent Documents 1 to 3.
[0007] The antenna coils disclosed in Patent Documents 1 and 2 has the problems in that it is necessary to decrease the width of the magnetic-material core in order to increase the number of turns of the coil, it is not possible to increase the number of turns of the coil when the width of the magnetic-material core is increased, and the loss of the coil is increased when the line width of the coil conductor is decreased to increase the number of turns.
[0008] In addition, the antenna coil disclosed in Patent Document 1 has a structure in which the antenna coil is coupled to the magnetic flux parallel to the rear conductive plate 34, as illustrated in Fig. 1. Accordingly, when the antenna coil is mounted in, for example, a mobile phone terminal, there is a problem in that the mobile phone terminal cannot be used with being held over the surface of a reader-writer in parallel if the antenna coil is installed in parallel with a circuit board in the casing of the mobile phone terminal.
[0009] In the coil antenna disclosed in Patent Document 3, since the member of a high permeability (a magnetic-material core) is vertically directed, the communication is disabled if the coil antenna is placed on a conductor plate.
[0010] Accordingly, we have appreciated that it would be desirable to provide a compact coil antenna that operates even if the coil antenna is arranged closely to its conductor plate and that has a higher degree of coupling with a target antenna.
[0011] According to the present invention there is provided a coil antenna comprising a flexible substrate having a coil conductor formed thereon and a planar magnetic-material core, wherein, of the coil conductor, the arrangement interval in a part that is parallel to the axis of the magnetic-material core is shorter than the arrangement interval in a part that is orthogonal to the axis of the magnetic-material core.
[0012] Preferably the coil conductor is composed of multiple layers, and the parts of the respective layers of the coil conductor, which are parallel to the axis of the magnetic-material core, are arranged so as to be superposed on one another.
[0013] Preferably, the coil conductor is formed in a spiral form around a coil conductor opening, the flexible substrate has an aperture at a position corresponding to the coil conductor opening of the coil conductor, and the magnetic-material core passes through the aperture.
[0014] Preferably, the coil conductor is formed in a rectangular spiral form including two parts that are parallel to the axis of the magnetic-material core and two parts that are orthogonal to the axis of the magnetic-material core, and part of either of the two parts of the coil conductor, which are orthogonal to the axis of the magnetic-material core, is covered with the magnetic-material core.
[0015] Preferably, the coil conductor is formed in a spiral form around a coil conductor opening, and the flexible substrate is folded in the coil conductor opening of the coil conductor to be arranged so as to wrap the magnetic-material core.
[Advantages] [0016] Embodiments of the present invention may have the following advantages: The coil antenna operates and is able to communicate even if the coil antenna is arranged closely to a conductor plate.
[0017] Since the width of the magnetic-material core can be increased with the same antenna size, the amount of magnetic flux through the magnetic-material core is increased to improve the coumiunication performance.
[0018] Since the line width of the coil can be increased with the same antenna size, the loss of the coil is reduced to improve the communication performance.
[0019] Increasing the pitch of the coil pattern allows the coupling coefficient with a target antenna coil to be increased, thus improving the communication performance.
[0020]
[Brief Description of the Drawingsj
Embodiments of the present invention will now be described by way of example only and with reference to the accompanying drawings, in which: [0021] Fig. 1 is a top view illustrating the structure of a coil antenna described in Patent Document 1.
Fig. 2 includes diagrams illustrating the structure of a coil antenna according to a first embodiment: Fig. 2(h) is a top view of a flexible substrate 101, Fig. 2(B) illustrates the shape of an upper coil conductor part uS of a coil conductor 11, Fig. 2(C) illustrates the shape of a lower coil conductor part liii of the coil conductor 11, and Fig. 2(D) illustrates a state in which the upper coil conductor part uS is over the lower coil conductor part 11U.
Fig. 3(A) is a top view of a coil antenna 201 embodying the invention and Fig. 3(B) is a front view of the coil antenna 201.
Fig. 4 illustrates the relationship between a coil length L and the coupling coefficient.
Fig. 5(A) is a top view of a coil antenna 202 according to a second embodiment and Fig. 5(B) is a front view of the entire antenna apparatus including the coil antenna 202.
Fig. 6(A) is a top view of a coil antenna 203 according to a third embodiment, Fig. 6(B) is a bottom view of the coil antenna 203, and Fig. 6(C) is a front view of the entire antenna apparatus including the coil antenna 203.
Detailed description of embodiments of the invention [0022] <<First Embodiment>> Fig. 2 includes diagrams illustrating the structure of a coil antenna according to a first embodiment.
S
Fig. 2(A) is a top view of a flexible substrate 101, which is one component of the coil antenna. The flexible substrate 101 includes a base 10 and a coil conductor 11.
The coil conductor 11 is formed on the top face of the base 10.
Fig. 2(B) illustrates the shape of an upper coil conductor part uS of the coil conductor 11. Fig. 2(0) illustrates the shape of a lower coil conductor part 11U of the coil conductor 11. Fig. 2(D) illustrates a state in which the upper coil conductor part US is over the lower coil conductor part flU.
[0024] Each of the lower coil conductor part 11U and the upper coil conductor part uS has a substantially rectangular and spiral shape, and an insulating layer exists between the lower coil conductor part ilU and the upper coil conductor part uS. However, the inner end of the lower coil conductor part flU conducts to the inner end of the upper coil conductor part uS to be connected in series to the inner end of the upper coil conductor part uS. In the above manner, the coil conductor 11 is formed in a spiral shape around a coil conductor opening OW.
[0025] A terminal electrode 12 connecting to the outer end of the upper coil conductor part uS is provided on the flexible substrate 101. In addition, a terminal electrode 13 connecting to the outer end of the lower coil conductor part flu is provided on the flexible substrate 101.
[0026] The lower coil conductor part 11U and the upper coil conductor part uS may be formed on both faces of the base of the flexible substrate, instead of being formed on one side of the base of the flexible substrate with the upper coil conductor part uS being over the lower coil conductor part 11U.
As illustrated in Fig. 2(A), an aperture (slit) S is formed at a position corresponding to the coil conductor opening Cw in the base 10 of the flexible substrate 101.
[0027] Fig. 3(A) is a top view of a coil antenna 201. Fig. 3(B) is a front view of the coil antenna 201.
A magnetic-material core 1 formed of a rectangular planar ferrite sheet passes through the aperture S of the flexible substrate 101 to compose the coil antenna 201. An antenna apparatus is configured by arranging the coil antenna 201 closely to a planar conductor 2. The planar conductor 2 is, for example, a circuit board on which the coil antenna 201 is installed. The coil antenna 201 is arranged such that the face on which the terminal electrodes 12 and 13 illustrated in Fig. 3(A) are formed opposes the planar conductor (circuit board) 2.
[002 8j As illustrated in Fig. 2(A), in the lower coil conductor part 11U and the upper coil conductor part uS, the arrangement interval in parallel-to--axis parts PA that are parallel to the direction of the axis of the magnetic-material core 1 (the lateral direction in the figure) (the direction of the magnetic path) is shorter than the arrangement interval in orthogonal-to-axis parts CA that are orthogonal to the axis of the magnetic-material core 1. In addition, in this example, the parallel-to-axis parts PA of the upper coil conductor part uS are arranged so as to be over the parallel-to-axis parts PA of the lower coil conductor part 11U.
[0029} Accordingly, the width of the magnetic-material core can be increased with the same antenna size and the line width of the coil can be increased with the same antenna size, thus further increasing the pitch of the coil pattern.
[0030] Here, the results of simulation of the resistance representing the loss of the coil and the coupling coefficient representing the level of the communication performance (the coupling coefficient with a target coil -10 -antenna) are shown. Simulation conditions are as follows: [0031] <Each Coil Antenna> (1) Coil antenna having a first structure in related art A coil antenna having a large line width of the coil conductor and a small width of the magnetic core, in which coils parallel to the length of the magnetic core are not superposed on one another.
Size of the magnetic-material core 14 mm x 15 mm x 0.2 mm Line width of the coil conductor 0.1 mm (2) Coil antenna having a second structure in the related art A coil antenna having a small line width of the coil conductor and a large width of the magnetic core, in which coils parallel to the length of the magnetic core are not superposed on one another.
Size of the magnetic-material core 17 mm x 15 mm x 0.2 mm Line width of the coil conductor 0.1 mm (3) Coil antenna embodying the present invention A coil antenna having a large line width of the coil conductor and a large width of the magnetic core, in which coils parallel to the length of the magnetic-material core -11 -are superposed on one another.
Size of the magnetic-material core 17 mm x 15 mm x 0.2 mm Line width of the coil conductor 0.3 mm <Common items> Size of the target coil antenna 100 mm x 100 mm Distance from the target coil antenna 30 mm Size of the coil conductor of each coil antenna 20 mm x 15 mm The number of turns of the coil conductor of each coil antenna 6 The relationship between the resistance representing the loss of the coil and the coupling coefficient representing the level of the communication performance is as follows: [0032J Coil antenna Resistance Coupling coefficient (1) 1.59 2.11% (2) 2.00 2.29% (3) 1.62 2.33% In the above manner, it is possible to compose the coil antenna having a high coupling coefficient with the target antenna and a low resistance.
[0033] Next, the relationship between a coil length L (the dimension of the coil in the direction of the axis of the -12 -
S
coil in a range in which the coil is wound around the magnetic-material core) and the coupling coefficient is illustrated in Fig. 4. The same simulation conditions as the ones described above are used in this case.
As apparent from Fig. 4, the coupling coefficient reaches the maximum value when the ratio of the length L of the coil with respect to the length M of the magnetic-material core 1 in the direction of the axis exceeds 25%.
Accordingly, it is possible to achieve the best communication performance.
[0034] <<Second Embodiment>> Fig. 5(A) is a top view of a coil antenna 202 according to a second embodiment. Fig. 5(B) is a front view of the entire antenna apparatus including the coil antenna 202.
A flexible substrate 102 includes the base 10 and the coil conductor 11. The coil conductor 11 is formed on the top face of the base 10.
[0035] The coil conductor 11 includes the lower coil conductor part and the upper coil conductor part each having a substantially rectangular and spiral shape, as in the first embodiment. The coil antenna 202 differs from the coil antenna in the first embodiment in that the flexible substrate 102 is arranged so as to be over the magnetic- -13 -material core 1.
[0036] The coil conductor 11 includes the parallel-to-axis parts PA that are parallel to the axis of the magnetic-material core 1 and the orthogonal-to-axis parts CA that are orthogonal to the axis of the magnetic-material core 1. The arrangement interval in the parallel-to-axis parts PA is shorter than the arrangement interval in the orthogonal-to-axis parts CA.
Part of either of the two parallel-to-axis parts PA of the coil conductor 11 is covered with the magnetic-material core 1.
[0037] Also with the above structure, it is possible to compose the coil antenna having a high coupling coefficient with a target antenna and a low resistance, as in the first embodiment. In addition, it is possible to compose the compact coil antenna that operates even if the coil antenna is arranged closely to its conductor plate.
[0038] <<Third Embodiment>> Fig. 6(A) is a top view of a coil antenna 203 according to a third embodiment. Fig. 6(B) is a bottom view of the coil antenna 203. Fig. 6(C) is a front view of the entire antenna apparatus including the coil antenna 203.
-14 -[0039] A flexible substrate 103 includes the base 10 and the coil conductor 11. The coil conductor 11 is formed on one surface of the base 10.
[0040) The coil conductor 11 includes the lower coil conductor part and the upper coil conductor part each having a substantially rectangular and spiral shape, as in the first and second embodiments. The coil antenna 203 differs from the coil antenna in the second embodiment in that the flexible substrate 103 is folded to be arranged so as to wrap the magnetic-material core 1.
[0041] The coil conductor 11 includes the parallel-to-axis parts PA that are parallel to the axis of the magnetic-material core 1 and the orthogonal-to-axis parts CA that are orthogonal to the axis of the magnetic-material core 1.
The flexible substrate 103 is folded along a line through the coil conductor opening OW of the coil conductor 11 to be arranged so as to wrap the magnetic-material core 1.
[0042] Also with the above structure, it is possible to compose the coil antenna having a high coupling coefficient with a target antenna and a low resistance, as in the first and second embodiments. In addition, it is possible to -15 -compose the compact coil antenna that operates even if the coil antenna is arranged closely to its conductor plate.
[Reference Numerals] [0043) CA orthogonal-to-axis part CW coil conductor opening PA parallel-to-axis part S aperture 1 magnetic-material core 2 planar conductor base 11 coil conductor US upper coil conductor part 11U lower coil conductor part 12, 13 terminal electrode 101 to 103 flexible substrate 201 to 203 coil antenna -16 -
Claims (6)
- CLAIMS1. A coil antenna comprising a flexible substrate having a coil conductor formed thereon and a planar magnetic-material core, wherein, of the coil conductor, the arrangement interval in a part that is parallel to the axis of the magnetic-material core is shorter than the arrangement interval in a part that is orthogonal to the axis of the magnetic-material core.
- 2. The coil antenna according to Claim 1, wherein the coil conductor is composed of multiple layers, and the parts of the respective layers of the coil conductor, which are parallel to the axis of the magnetic-material core, are arranged so as to be superposed on one another.
- 3. The coil antenna according to Claim 1 or 2, wherein the coil conductor is formed in a spiral form around a coil conductor opening, the flexible substrate has an aperture at a position corresponding to the coil conductor opening of the coil conductor, and the magnetic-material core passes through the aperture.
- 4. The coil antenna according to Claim 1 or 2, wherein the coil conductor is formed in a rectangular spiral form including two parts that are parallel to the axis of the magnetic-material core and two parts that are orthogonal to the axis of the magnetic-material core, and part of either of the two parts of the coil conductor, which are orthogonal to the axis of the magnetic-material core, is covered with the magnetic-material core.
- 5. The coil antenna according to Claim 1 or 2, wherein the coil conductor is formed in a spiral form around a coil conductor opening, and the flexible substrate is folded in the coil conductor opening of the coil conductor to be arranged so as to wrap the magnetic-material core.
- 6. A coil antenna substantially as herein described with reference to Figures 2, 3, 5 or 6 of the accompanying drawings.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2009119027A JP4883136B2 (en) | 2009-05-15 | 2009-05-15 | Coil antenna |
Publications (3)
| Publication Number | Publication Date |
|---|---|
| GB201008206D0 GB201008206D0 (en) | 2010-06-30 |
| GB2470299A true GB2470299A (en) | 2010-11-17 |
| GB2470299B GB2470299B (en) | 2011-10-26 |
Family
ID=42334883
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB1008206A Active GB2470299B (en) | 2009-05-15 | 2010-05-17 | Coil antenna with a planar magnetic core |
Country Status (3)
| Country | Link |
|---|---|
| JP (1) | JP4883136B2 (en) |
| CN (1) | CN101888021B (en) |
| GB (1) | GB2470299B (en) |
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| US8740093B2 (en) | 2011-04-13 | 2014-06-03 | Murata Manufacturing Co., Ltd. | Radio IC device and radio communication terminal |
| US8757502B2 (en) | 2011-02-28 | 2014-06-24 | Murata Manufacturing Co., Ltd. | Wireless communication device |
| US8770489B2 (en) | 2011-07-15 | 2014-07-08 | Murata Manufacturing Co., Ltd. | Radio communication device |
| US8797148B2 (en) | 2008-03-03 | 2014-08-05 | Murata Manufacturing Co., Ltd. | Radio frequency IC device and radio communication system |
| US8797225B2 (en) | 2011-03-08 | 2014-08-05 | Murata Manufacturing Co., Ltd. | Antenna device and communication terminal apparatus |
| US8814056B2 (en) | 2011-07-19 | 2014-08-26 | Murata Manufacturing Co., Ltd. | Antenna device, RFID tag, and communication terminal apparatus |
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| DE102013104059A1 (en) * | 2013-04-22 | 2014-10-23 | Infineon Technologies Ag | Antenna arrangement, communication device and antenna structure |
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| US8905296B2 (en) | 2011-12-01 | 2014-12-09 | Murata Manufacturing Co., Ltd. | Wireless integrated circuit device and method of manufacturing the same |
| US8917211B2 (en) | 2008-11-17 | 2014-12-23 | Murata Manufacturing Co., Ltd. | Antenna and wireless IC device |
| US8973841B2 (en) | 2008-05-21 | 2015-03-10 | Murata Manufacturing Co., Ltd. | Wireless IC device |
| US8976075B2 (en) | 2009-04-21 | 2015-03-10 | Murata Manufacturing Co., Ltd. | Antenna device and method of setting resonant frequency of antenna device |
| US9024837B2 (en) | 2010-03-31 | 2015-05-05 | Murata Manufacturing Co., Ltd. | Antenna and wireless communication device |
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| JP4367717B2 (en) * | 2007-03-26 | 2009-11-18 | ソニー・エリクソン・モバイルコミュニケーションズ株式会社 | Near field communication antenna and portable device |
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2009
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2010
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- 2010-05-17 GB GB1008206A patent/GB2470299B/en active Active
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| US8797148B2 (en) | 2008-03-03 | 2014-08-05 | Murata Manufacturing Co., Ltd. | Radio frequency IC device and radio communication system |
| US9022295B2 (en) | 2008-05-21 | 2015-05-05 | Murata Manufacturing Co., Ltd. | Wireless IC device |
| US8973841B2 (en) | 2008-05-21 | 2015-03-10 | Murata Manufacturing Co., Ltd. | Wireless IC device |
| US9281873B2 (en) | 2008-05-26 | 2016-03-08 | Murata Manufacturing Co., Ltd. | Wireless IC device system and method of determining authenticity of wireless IC device |
| US8917211B2 (en) | 2008-11-17 | 2014-12-23 | Murata Manufacturing Co., Ltd. | Antenna and wireless IC device |
| US8876010B2 (en) | 2009-04-14 | 2014-11-04 | Murata Manufacturing Co., Ltd | Wireless IC device component and wireless IC device |
| US8976075B2 (en) | 2009-04-21 | 2015-03-10 | Murata Manufacturing Co., Ltd. | Antenna device and method of setting resonant frequency of antenna device |
| US8853549B2 (en) | 2009-09-30 | 2014-10-07 | Murata Manufacturing Co., Ltd. | Circuit substrate and method of manufacturing same |
| US9117157B2 (en) | 2009-10-02 | 2015-08-25 | Murata Manufacturing Co., Ltd. | Wireless IC device and electromagnetic coupling module |
| US9024725B2 (en) | 2009-11-04 | 2015-05-05 | Murata Manufacturing Co., Ltd. | Communication terminal and information processing system |
| US10013650B2 (en) | 2010-03-03 | 2018-07-03 | Murata Manufacturing Co., Ltd. | Wireless communication module and wireless communication device |
| US9727765B2 (en) | 2010-03-24 | 2017-08-08 | Murata Manufacturing Co., Ltd. | RFID system including a reader/writer and RFID tag |
| US9024837B2 (en) | 2010-03-31 | 2015-05-05 | Murata Manufacturing Co., Ltd. | Antenna and wireless communication device |
| US9558384B2 (en) | 2010-07-28 | 2017-01-31 | Murata Manufacturing Co., Ltd. | Antenna apparatus and communication terminal instrument |
| US8757502B2 (en) | 2011-02-28 | 2014-06-24 | Murata Manufacturing Co., Ltd. | Wireless communication device |
| US8960561B2 (en) | 2011-02-28 | 2015-02-24 | Murata Manufacturing Co., Ltd. | Wireless communication device |
| US8797225B2 (en) | 2011-03-08 | 2014-08-05 | Murata Manufacturing Co., Ltd. | Antenna device and communication terminal apparatus |
| US8740093B2 (en) | 2011-04-13 | 2014-06-03 | Murata Manufacturing Co., Ltd. | Radio IC device and radio communication terminal |
| US9378452B2 (en) | 2011-05-16 | 2016-06-28 | Murata Manufacturing Co., Ltd. | Radio IC device |
| US8770489B2 (en) | 2011-07-15 | 2014-07-08 | Murata Manufacturing Co., Ltd. | Radio communication device |
| US8814056B2 (en) | 2011-07-19 | 2014-08-26 | Murata Manufacturing Co., Ltd. | Antenna device, RFID tag, and communication terminal apparatus |
| US9543642B2 (en) | 2011-09-09 | 2017-01-10 | Murata Manufacturing Co., Ltd. | Antenna device and wireless device |
| US8905296B2 (en) | 2011-12-01 | 2014-12-09 | Murata Manufacturing Co., Ltd. | Wireless integrated circuit device and method of manufacturing the same |
| US9692128B2 (en) | 2012-02-24 | 2017-06-27 | Murata Manufacturing Co., Ltd. | Antenna device and wireless communication device |
| US10235544B2 (en) | 2012-04-13 | 2019-03-19 | Murata Manufacturing Co., Ltd. | Inspection method and inspection device for RFID tag |
| DE102013104059A1 (en) * | 2013-04-22 | 2014-10-23 | Infineon Technologies Ag | Antenna arrangement, communication device and antenna structure |
| US10096902B2 (en) | 2013-04-22 | 2018-10-09 | Infineon Technologies Ag | Antenna arrangement, communication appliance and antenna structure |
| DE102013104059B4 (en) | 2013-04-22 | 2024-05-29 | Infineon Technologies Ag | Antenna arrangement and communication device |
| DE102013104059B8 (en) | 2013-04-22 | 2024-09-19 | Infineon Technologies Ag | Antenna arrangement and communication device |
Also Published As
| Publication number | Publication date |
|---|---|
| GB201008206D0 (en) | 2010-06-30 |
| JP2010268306A (en) | 2010-11-25 |
| CN101888021B (en) | 2014-03-12 |
| GB2470299B (en) | 2011-10-26 |
| JP4883136B2 (en) | 2012-02-22 |
| CN101888021A (en) | 2010-11-17 |
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