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WO2019215963A1 - Dispositif de communication sans fil et article pourvu du dispositif de communication sans fil - Google Patents

Dispositif de communication sans fil et article pourvu du dispositif de communication sans fil Download PDF

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Publication number
WO2019215963A1
WO2019215963A1 PCT/JP2019/002248 JP2019002248W WO2019215963A1 WO 2019215963 A1 WO2019215963 A1 WO 2019215963A1 JP 2019002248 W JP2019002248 W JP 2019002248W WO 2019215963 A1 WO2019215963 A1 WO 2019215963A1
Authority
WO
WIPO (PCT)
Prior art keywords
antenna
top plate
main body
wireless communication
communication device
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.)
Ceased
Application number
PCT/JP2019/002248
Other languages
English (en)
Japanese (ja)
Inventor
慶広 青山
加藤　登
越智　達也
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Murata Manufacturing Co Ltd
Original Assignee
Murata Manufacturing Co Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Murata Manufacturing Co Ltd filed Critical Murata Manufacturing Co Ltd
Priority to JP2019528944A priority Critical patent/JP6601597B1/ja
Publication of WO2019215963A1 publication Critical patent/WO2019215963A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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Classifications

    • G—PHYSICS
    • G06—COMPUTING OR CALCULATING; 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
    • H01Q1/40—Radiating elements coated with or embedded in protective material
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q13/00—Waveguide horns or mouths; Slot antennas; Leaky-waveguide antennas; Equivalent structures causing radiation along the transmission path of a guided wave
    • H01Q13/08—Radiating ends of two-conductor microwave transmission lines, e.g. of coaxial lines, of microstrip lines

Definitions

  • the present invention relates to a wireless communication device capable of wireless communication even when attached to a metal surface, and an article provided with the wireless communication device.
  • Patent Document 1 discloses a wireless communication device (RFID (Radio-Frequency) in which a wireless IC element (RFIC (Radio-Frequency Integrated Circuit) chip) and a conductor pattern connected thereto are protected by a resin protective case. IDentification) tag) is disclosed.
  • the RFIC chip and the conductor pattern are provided on the surface of the dielectric block, and the dielectric block is accommodated in the protective case.
  • the conductor pattern is provided on the first main surface of the dielectric block and connected to one terminal of the RFIC chip, and on the second main surface facing the first main surface.
  • a ground conductor connected to the other terminal of the RFIC chip, and a short-circuit conductor connecting the radiation conductor and the ground conductor.
  • the RFID tag described in Patent Document 1 has a high manufacturing cost due to many necessary components and a complicated structure.
  • a dielectric block is necessary to hold an RFIC chip, a radiation conductor, or the like.
  • an object of the present invention is to protect an RFIC chip and an antenna connected thereto while enabling wireless communication even when attached to a metal surface of an article with a simple structure in a wireless communication device such as an RFID tag. .
  • a wireless communication device that can be used while attached to a metal surface of an article,
  • a casing member including a top plate portion provided with a back surface facing the metal surface with a space, and a top plate support portion erected on the back surface side from the top plate portion;
  • An antenna comprising a main body provided on the back surface of the top plate portion of the casing member, and a connection portion extending from the main body toward the metal surface and connected to the metal surface in a direct current manner or capacitively coupled
  • An RFIC chip provided on the back surface of the top plate portion of the casing member and connected to the antenna;
  • the casing member further includes an antenna support portion that supports the main body portion of the antenna in a state where a space is provided between the top plate portion and the main body portion of the antenna.
  • a wireless communication device is provided.
  • An article comprising a metal surface at least in part, and a wireless communication device attached to the metal surface
  • the wireless communication device is A casing member including a top plate portion provided with a back surface facing the metal surface with a space, and a top plate support portion erected on the back surface side from the top plate portion;
  • An antenna comprising a main body provided on the back surface of the top plate portion of the casing member, and a connection portion extending from the main body toward the metal surface and connected to the metal surface in a direct current manner or capacitively coupled
  • An RFIC chip provided on the back surface of the top plate portion of the casing member and connected to the antenna;
  • the casing member further includes an antenna support portion that supports the main body portion of the antenna in a state where a space is provided between the top plate portion and the main body portion of the antenna. Articles are provided.
  • the RFIC chip and the antenna connected to the RFIC chip can be protected with a simple structure while enabling wireless communication even when attached to a metal surface of an article.
  • FIG. 3 is an exploded perspective view of a wireless communication device according to another embodiment of the present invention.
  • the wireless communication device is a wireless communication device that can be used in a state where the wireless communication device is attached to a metal surface of an article, and includes a top plate portion provided with a back surface facing the metal surface with a space therebetween, And a casing member including a top plate support portion standing on the back surface side from the top plate portion, a main body portion provided on the back surface of the top plate portion of the casing member, and extending from the main body portion toward the metal surface.
  • An antenna having a connection portion that is connected to the metal surface in a direct current or capacitively coupled, and an RFIC chip that is provided on the back surface of the top plate portion of the casing member and is connected to the antenna.
  • the casing member further includes an antenna support portion that supports the main body portion of the antenna in a state where a space is provided between the top plate portion and the main body portion of the antenna.
  • the RFIC chip and the antenna connected to the RFIC chip can be protected with a simple structure while enabling wireless communication even when attached to a metal surface of an article.
  • the antenna support portion may include a spacer portion that protrudes from the back surface of the top plate portion of the casing member and includes a contact surface that contacts the main body portion of the antenna.
  • the spacer portion provides a space between the top plate portion of the casing member and the main body portion of the antenna.
  • the area of the contact surface of the spacer portion with respect to the main body portion of the antenna is half of the total area of the main body portion of the antenna when viewed from the facing direction of the top plate portion of the casing member and the main body portion of the antenna. Smaller than that. Thereby, dielectric loss is suppressed.
  • the antenna connection portion may extend along the top plate support portion with a space provided between the antenna member and the top plate support portion of the casing member. Thereby, dielectric loss is suppressed.
  • the main body portion of the antenna may include a through hole, and the antenna support portion may include an engagement pin portion that engages with the through hole. Thereby, the antenna can be fixed to the casing member.
  • the casing member may be a cap-shaped member.
  • the wireless communication device may include a conductor plate that is provided on the cap-shaped member so as to close an internal space of the cap-shaped member and is attached to the metal surface.
  • the connecting portion of the antenna may be connected to the conductor plate.
  • the antenna may be an inverted F antenna.
  • the feed line portion and the short-circuit line portion of the inverted F antenna may be connected to the conductor plate as the connection portion.
  • An article according to another aspect of the present invention is an article provided with a metal surface at least in part, and a wireless communication device attached to the metal surface, wherein the wireless communication device is spaced from the metal surface.
  • a casing member including a top plate portion having opposite back surfaces, a top plate support portion standing on the back surface side from the top plate portion, a main body portion provided on the back surface of the top plate portion of the casing member, and the main body
  • An antenna provided with a connection portion extending from the portion toward the metal surface and connected to the metal surface in a direct current manner or capacitively coupled to the top surface of the casing member;
  • a support part is provided.
  • the RFIC chip and the antenna connected thereto can be protected by a simple structure while enabling wireless communication even when attached to a metal surface of the article. it can.
  • FIG. 1 is a perspective view of a wireless communication device according to an embodiment of the present invention attached to an article
  • FIG. 2 is an exploded perspective view of the wireless communication device
  • FIG. 3 is a cross-sectional view of the wireless communication device.
  • the XYZ coordinate system is for facilitating understanding of the invention, and does not limit the invention.
  • the X-axis direction indicates the longitudinal direction of the RFID tag
  • the Y-axis direction indicates the width direction
  • the Z-axis direction indicates the thickness direction.
  • the wireless communication device 10 is a so-called RFID (Radio-FrequencyentIDentification) tag, and is used in a state where it is attached to a metal surface Wa of an article W such as a metal plate, for example.
  • RFID Radio-FrequencyentIDentification
  • the RFID tag 10 includes a cap-shaped member 12, an antenna 14 provided in the cap-shaped member 12, and an RFIC (Radio-FrequencyrIntegrated Circuit) module 16. And a conductor plate 18 that closes the internal space R of the cap-shaped member 12 and a seal member 20 provided on the conductor plate 18.
  • RFIC Radio-FrequencyrIntegrated Circuit
  • the cap-shaped member 12 is a cap-shaped casing member that protects the antenna 14 and the RFIC module 16, and is made of, for example, a resin material such as polycarbonate, polypropylene, polyester, or polyetheretherketone.
  • the cap-shaped member 12 includes a flat plate-like top plate portion 12a and a cylindrical side wall portion 12b standing from the outer peripheral edge of the top plate portion 12a.
  • the RFID tag 10 has a flange-shaped tip surface (flange portion) 12 c of the side wall portion 12 b, that is, an opening edge portion 12 c of the cap-shaped member 12 on the metal surface Wa of the article W. It is attached via the seal member 20.
  • the back surface 12d of the top plate portion 12a of the cap-shaped member 12 is placed on the metal surface Wa as shown in FIG. Opposite the space.
  • the back surface 12d of the top plate portion 12a is parallel to the metal surface Wa. That is, the side wall portion 12b functions as a top plate support portion that stands on the back surface 12d side from the top plate portion 12a and supports the top plate portion 12a with a space left from the metal surface Wa.
  • the antenna 14 is provided on the back side of the cap-shaped member 12 (the surface of the cap-shaped member 12 that defines the internal space R).
  • the antenna 14 is made of a conductor material such as brass plated with nickel / tin, for example.
  • the antenna 14 is produced, for example, by press molding (punching and bending with a press machine) a metal sheet or a metal thin plate.
  • the antenna 14 includes a main body portion 14a and a connection portion 14b extending from the main body portion 14a.
  • the connection portion 14 b is connected to the metal surface Wa of the article W via the conductor plate 18. Further details of the antenna 14 will be described later.
  • the RFIC module 16 is a module including an RFIC chip and a matching circuit that performs matching between the antenna 14 and an RFIC (Radio-Frequency Integrated Circuit) chip, and is connected to the antenna 14.
  • the RFIC module 16 is provided on the back surface 12 d of the top plate portion 12 a of the cap-shaped member 12 via the antenna 14. Further details of the RFIC module 16 will be described later.
  • the conductor plate 18 is a plate-like member made of a conductor material, and is provided on the cap-like member 12 so as to close the internal space R into a sealed space.
  • the conductor plate 18 is also provided on the cap-shaped member 12 in parallel to the back surface 12d of the top plate portion 12a of the cap-shaped member 12. Thereby, the antenna 14 and the RFIC module 16 are covered and protected by the cap-shaped member 12 and the conductor plate 18.
  • the conductor plate 18 is preferably made of the same material as the antenna 14 because it is connected to the connection portion 14b of the antenna 14.
  • the seal member 20 is a so-called double-sided tape, and is a member for attaching the RFID tag 10 to the metal surface Wa of the article W.
  • One adhesive surface 20 a of the sealing member 20 is attached to the flange portion 12 c of the cap-shaped member 12 and the conductor plate 18.
  • the other adhesive surface 20b is attached to the metal surface Wa of the article W.
  • the main body portion 14 a of the antenna 14 is attached to the back surface 12 d of the top plate portion 12 a of the cap-shaped member 12.
  • the cap-shaped member 12 includes a plurality of antenna support portions 12e on the back surface 12d of the top plate portion 12a.
  • the antenna support portion 12e of the cap-shaped member 12 is configured to support the main body portion 14a of the antenna 14 with a space provided between the top plate portion 12a of the cap-shaped member 12 and the main body portion 14a of the antenna 14. Has been.
  • FIG. 4 is a perspective view showing the antenna support portion before supporting the antenna.
  • each of the plurality of antenna support portions 12 e protrudes from the back surface 12 d of the top plate portion 12 a of the cap-like member 12 and contacts the main body portion 14 a of the antenna 14.
  • the spacer part 12g provided with the contact surface 12f is included.
  • the protruding height of the spacer portion 12g (the distance from the back surface 12d of the top plate portion 12a to the contact surface 12f) is, for example, 0.2 mm.
  • a space that is, a dielectric, is formed between the main body portion 14a and the top plate portion 12a of the cap-shaped member 12.
  • a layer of air with a rate of 1 is provided.
  • the main body portion 14b is provided in parallel to the back surface 12d of the top plate portion 12a. The reason for providing such a space will be described later.
  • a plurality of antenna support portions Each of 12e includes an engagement pin portion 12h.
  • a plurality of through holes 14 c that are engaged with the engaging pin portions 12 h are formed in the main body portion 14 a of the antenna 14.
  • the engagement pin portion 12h has a pin shape protruding from the spacer portion 12g and passes through a through hole 14c formed in the main body portion 14a of the antenna 14.
  • the body pin portion 14a of the antenna 14 is deformed like a rivet head portion by heating the portion (head portion) of the engaging pin portion 12h that has passed through the through hole 14c, for example. It is fixed to the member 12.
  • the main body portion 14 a of the antenna 14 is maintained in a posture parallel to the back surface 12 d of the top plate portion 12 a of the cap-shaped member 12 and parallel to the conductor plate 18. Is done.
  • the shape of the head portion of the engagement pin portion 12h after the deformation is preferably tapered so that the width becomes narrower as the distance from the main body portion 14a of the antenna 14 increases. Further, as shown in FIG. It is preferable to have a head shape. Furthermore, it is preferable that the thickness of the head (the distance from the top of the head to the main body 14a of the antenna 14) is large. The reason is that, for example, when an external force is applied to the engaging pin portion 12h, the possibility that the head is lost can be reduced (the external force can be dispersed). As a result, the main body portion 14a of the antenna 14 can be reliably fixed to the cap-shaped member 12, and variations in frequency can be reduced.
  • a columnar portion 12j is provided on the back surface 12d of the top plate portion 12a of the cap-shaped member 12 in addition to the antenna support portion 12e.
  • the columnar portion 12 j penetrates through the main body portion 14 a of the antenna 14, and its tip contacts the conductor plate 18. Thereby, it is suppressed that the top-plate part 12a of the cap-shaped member 12 bends toward the conductor board 18.
  • the conductor plate 18 is also fixed to the cap-shaped member 12 in the same manner as the main body 14 a of the antenna 14. For this purpose, as shown in FIG. 2, a plurality of through holes 18 a are formed in the conductor plate 18. An engaging pin portion (not shown) that engages with these through holes 18 a is provided in the cap-shaped member 12.
  • connection portion 14b of the antenna 14 is a portion for connecting the main body portion 14a and the conductor plate 18. That is, the connection portion 14 b of the antenna 14 is connected to the metal surface Wa of the article W via the conductor plate 18 and the seal member 20.
  • the antenna 14 is connected to the metal surface Wa of the article W in a direct current manner.
  • the sealing member 20 has an insulating property, the antenna 14 is capacitively coupled to the metal surface Wa of the article W.
  • connection portion 14 b of the antenna 14 is directed from one end in the longitudinal direction (X-axis direction) of the main body portion 14 a toward the metal surface Wa, that is, toward the conductor plate 18. It is extended. As shown in FIG. 3, the connection portion 14 b extends along the side wall portion 12 b of the cap-shaped member 12. Specifically, the connection part 14b extends along the side wall part 12b with a space provided between the connection part 14b and the side wall part 12b. The reason for providing such a space will be described later.
  • FIG. 5 is a perspective view showing the connection between the antenna and the conductor plate.
  • connection portion 14b of the antenna 14 is connected to the conductor plate 18 via a band-shaped terminal portion 14d extending in the width direction (Y-axis direction) of the RFID tag 10. It is provided at one end in the longitudinal direction (X-axis direction) and is connected to a strip-shaped contact portion 18b extending in the width direction.
  • a through hole 14 e is formed in the terminal portion 14 d of the antenna 14, and a through hole 18 c is also formed in the contact portion 18 b of the conductor plate 18.
  • the terminal portion 14d of the antenna 14 and the contact portion 18b of the conductor plate 18 may be joined by, for example, solder. When these are joined by soldering, the through hole 14e of the terminal portion 14d of the antenna 14 and the through hole 18c of the contact portion 18b of the conductor plate 18 may be omitted.
  • the contact portion 18 b of the conductor plate 18 are formed with a plurality of convex portions 18 d that protrude toward the terminal portion 14 d of the antenna 14.
  • the contact portion 18b of the conductor plate 18 contacts the terminal portion 14d of the antenna 14 via the plurality of convex portions 18d. That is, by making point contact at a plurality of points, variations in contact resistance can be suppressed as compared to the case where the terminal portion 14d and the contact portion 18b are in surface contact.
  • the convex portion may be provided on the antenna 14 instead of the conductor plate 18. Further, as described above, when the terminal portion 14d of the antenna 14 and the contact portion 18b of the conductor plate 18 are joined by solder, the convex portion may be omitted.
  • the length L1 of the terminal portion 14d of the antenna 14 is longer than the length L2 of the contact portion 18b of the conductor plate 18.
  • FIG. 6 which is a bottom view of the RFID tag 10 before the seal member 20 is attached, a part of the terminal portion 14d of the antenna 14 is exposed to the outside.
  • the resistance between the terminal portion 14d of the antenna 14 and the contact portion 18b of the conductor plate 18 can be measured by bringing a tester probe into contact with the exposed portion of the terminal portion 14d of the antenna 14 and the conductor plate 18 respectively. it can. As a result, a contact failure between the antenna 14 and the conductor plate 18 can be detected.
  • the antenna 14 is a so-called inverted F antenna.
  • FIG. 7 is an equivalent circuit diagram of the RFID tag according to the present embodiment.
  • FIG. 7 shows an equivalent circuit in the RFID tag 10 in a state where the seal member 20 has an insulating property and the conductor plate 18 and the metal surface Wa of the article W are capacitively coupled.
  • the antenna 14 functions as an inverted-F antenna, so that the radiating portion 14 f that radiates radio waves, the feed line portion 14 g that connects the radiating portion 14 f and the metal surface Wa of the article W, and the short-circuit wire. Part 14h.
  • the radiating portion 14f of the antenna 14 is constituted by a free end side portion (that is, an anti-connection portion side portion) of the main body portion 14a.
  • the feeding line portion 14 g of the antenna 14 includes a radiation side conductor portion 14 j extending from the radiation portion 14 f and a connection side conductor portion extending from the terminal portion 14 d toward the radiation portion 14 f. 14k, and the RFIC module 16 connected to the radiation side conductor part 14j and the connection side conductor part 14k.
  • the connection side conductor portion 14k includes a connection portion 14b.
  • the short-circuit part 14h of the antenna 14 extends between the radiating part 14f and the terminal part 14d and connects them.
  • the short-circuit line portion 14h includes a connection portion 14b.
  • connection-side conductor portion 14k in the feeder portion 14g is appropriately bent.
  • the connection-side conductor portion 14k may be twisted without being properly bent when the antenna 14 is bent.
  • the terminal portion 14d and the connection-side conductor portion 14k are divided.
  • the connection-side conductor 14k and the RFIC module 16 are not appropriately electrically connected in a subsequent process.
  • the two short-circuit line portions 14h sandwich the power supply line portion 14g.
  • FIG. 8 is an exploded perspective view of the RFIC module.
  • FIG. 9 is an equivalent circuit diagram of the RFID module.
  • the RFIC module 16 is a device that performs wireless communication at a communication frequency of, for example, 900 MHz band, that is, UHF band.
  • the RFIC module 16 is composed of a multilayer substrate composed of three layers. Specifically, the RFIC module 16 is formed by stacking flexible insulating sheets 32A, 32B, and 32C made of a resin material such as polyimide or liquid crystal polymer.
  • the RFIC module 16 includes an RFIC (Radio-Frequency Integrated Circuit) chip 34, a plurality of inductance elements 36A, 36B, 36C, and 36D, and external connection terminals 38 and 40.
  • the inductance elements 36A to 36D and the external connection terminals 38 and 40 are formed on the insulating sheets 32A to 32C, and are composed of a conductor pattern made of a conductive material such as copper.
  • the RFIC chip 34 is mounted on the central portion in the longitudinal direction (X-axis direction) on the insulating sheet 32C.
  • the RFIC chip 34 has a structure in which various elements are built in a semiconductor substrate made of a semiconductor such as silicon.
  • the RFIC chip 34 includes a first input / output terminal 34a and a second input / output terminal 34b.
  • the RFIC chip 34 has an internal capacitance (capacitance: self-capacitance possessed by the RFIC chip itself) C1.
  • the inductance element (first inductance element) 36A is formed from a conductor pattern provided in a spiral coil shape on the insulating sheet 32C on one side in the longitudinal direction (X-axis direction) of the insulating sheet 32C. It is configured. As shown in FIG. 9, the inductance element 36A includes an inductance L1. A land 36Aa connected to the first input / output terminal 34a of the RFIC chip 34 is provided at one end (end outside the coil) of the inductance element 36A. A land 36Ab is also provided at the other end (end on the coil center side).
  • the inductance element (second inductance element) 36B is formed from a conductive pattern provided in a spiral coil shape on the insulating sheet 32C on the other side in the longitudinal direction (X-axis direction) of the insulating sheet 32C. It is configured. Moreover, as shown in FIG. 9, the inductance element 36B includes an inductance L2. A land 36Ba connected to the second input / output terminal 34b of the RFIC chip 34 is provided at one end (end outside the coil) of the inductance element 36A. A land 36Bb is also provided at the other end (end on the coil center side).
  • the inductance element (third inductance element) 36C is formed from a conductor pattern provided in a spiral coil shape on the insulating sheet 32B on one side in the longitudinal direction (X-axis direction) of the insulating sheet 32B. It is configured. Further, the inductance element 36C is opposed to the inductance element 36A in the stacking direction (Z-axis direction). Furthermore, as shown in FIG. 9, the inductance element 36C includes an inductance L3. A land 36Ca is provided at one end (end on the coil center side) of the inductance element 36C. The land 36Ca is connected to the land 36Ab of the inductance element 36A on the insulating sheet 32C via an interlayer connection conductor 42 such as a through-hole conductor that penetrates the insulating sheet 32B.
  • an interlayer connection conductor 42 such as a through-hole conductor that penetrates the insulating sheet 32B.
  • the inductance element (fourth inductance element) 36D is formed from a conductor pattern provided in a spiral coil shape on the insulating sheet 32B on the other side in the longitudinal direction (X-axis direction) of the insulating sheet 32B. It is configured.
  • the inductance element 36D is opposed to the inductance element 36B in the stacking direction (Z-axis direction).
  • the inductance element 36D includes an inductance L4.
  • a land 36Da is provided at one end (the end on the coil center side) of the inductance element 36D.
  • the land 36Da is connected to the land 36Bb of the inductance element 36B on the insulating sheet 32C via an interlayer connection conductor 44 such as a through-hole conductor that penetrates the insulating sheet 32B.
  • the inductance elements 36C and 36D on the insulating sheet 32B are integrated as one conductor pattern. That is, the other ends (ends outside the coil) are connected to each other.
  • the insulating sheet 32B is formed with a through hole 32Ba for accommodating the RFIC chip 34 mounted on the insulating sheet 32C.
  • the external connection terminals 38 and 40 are composed of a conductor pattern provided on the insulating sheet 32A.
  • the external connection terminals 32 and 40 are opposed to the longitudinal direction (X-axis direction) of the insulating sheet 32A.
  • One external connection terminal 38 is connected to a land 36Ca of an inductance element 36C on the insulation sheet 32B via an interlayer connection conductor 46 such as a through-hole conductor that penetrates the insulation sheet 32A.
  • the other external connection terminal 40 is connected to a land 36Da of the inductance element 36D on the insulating sheet 32B through an interlayer connection conductor 48 such as a through-hole conductor that penetrates the insulating sheet 32A.
  • One external connection terminal 38 is connected to the connection-side conductor portion 14k in the feeder line portion 14g of the antenna 14 through, for example, solder.
  • the other external connection terminal 40 is connected to the radiation side conductor portion 14j via, for example, solder.
  • the RFIC chip 34 is composed of a semiconductor substrate.
  • the RFIC chip 34 exists between the inductance elements 36A and 36B and between the inductance elements 36C and 36D.
  • the RFIC chip 34 functions as a shield, magnetic field coupling and capacitive coupling between the spiral coil-shaped inductance elements 36A and 36B provided on the insulating sheet 32C are suppressed.
  • magnetic field coupling and capacitive coupling between the spiral coil-shaped inductance elements 36C and 36D provided on the insulating sheet 32B are suppressed. As a result, it is suppressed that the pass band of the communication signal becomes narrow.
  • a matching circuit that performs matching between the RFIC chip 34 and the antenna 14 at a communication frequency by a capacitor C1 (internal capacitance of the RFIC chip 34) and inductances L1 to L4 (inductances of four inductance elements). Is configured.
  • the RFID tag 10 is attached to one metal surface Wa substantially via the radiating portion 14f of the antenna 14 when not attached to the metal surface Wa of the article W. If there is, the radio wave is exchanged with an external wireless communication device (for example, a reader / writer device) substantially through the radiating portion 14f and the metal surface Wa.
  • an external wireless communication device for example, a reader / writer device
  • the RFIC chip 34 of the RFIC module 16 is driven by the electromotive force.
  • the driven RFIC chip 34 transmits the data stored in the storage unit via the radiating unit 14f or the metal surface Wa.
  • the radiating portion 14 f and the conductor plate 18 are The capacity formed between them is sufficiently small and does not substantially affect the communication characteristics, particularly the communication distance and communication frequency.
  • the distance between the radiating portion 14f and the conductor plate 18 can be made as small as possible within a range that does not substantially affect the communication characteristics.
  • the radiating portion 14 f of the antenna 14 faces the metal surface Wa with the conductor plate 18 interposed therebetween.
  • the communication frequency is substantially the same as before the communication frequency is attached to the metal surface Wa.
  • the main body 14 a and the connection 14 b of the antenna 14 are provided on the cap-shaped member 12 with a space provided between the antenna 14 and the cap-shaped member 12. That is, an air layer is provided between the main body portion 14a of the antenna 14 and the top plate portion 12a of the cap-shaped member 12, and an air layer is provided between the connection portion 14b and the side wall portion 12b.
  • dielectric loss that is, loss of part of the current flowing through the antenna 14 by being converted to heat is suppressed (compared to a case where there is no space).
  • a decrease in communication characteristics For example, a decrease in communication distance and a shift in communication frequency peak are suppressed. For example, it is suppressed that the peak of 920 MHz shifts to 900 MHz.
  • the contact area of the cap-shaped member 12 with respect to the main body 14a of the antenna 14 is small.
  • the contact surface 12f of the spacer portion 12g with respect to the main body portion 14a of the antenna 14 in the opposite direction view (Z-axis direction view) between the top plate portion 12a of the cap-shaped member 12 and the main body portion 14a of the antenna 14. Is preferably smaller than half of the total area of the main body 14a of the antenna 14 (total area).
  • the contact area of the cap-shaped member 12 with respect to the main body portion 14a of the antenna 14 is made too small, the support for the main body portion 14a of the antenna 14 is insufficient, and the main body portion 14a bends. Therefore, there is a possibility that the main body 14a of the antenna 14 cannot be maintained in parallel.
  • the RFIC chip 34 (RFIC module 16) and the antenna 14 connected thereto can be wirelessly communicated even when attached to the metal surface Wa by a simple structure. Can be protected.
  • the RFIC module 16 including the RFIC chip 34 and the antenna 14 connected thereto are directly provided on the cap-shaped member 12 for protecting them. That is, the cap-shaped member 12 is a member that protects the RFIC module 16 and the antenna 14 and also holds them. Therefore, for example, it is not necessary to adopt a complicated configuration such as providing the RFIC chip 34 or the antenna 14 on a substrate or block and protecting the substrate or block with a protective case.
  • the main body portion 14a (radiating portion 14f) of the antenna 14 is provided in the cap-shaped member 12 in a state where a space is provided between the antenna 14 and the cap-shaped member 12, the dielectric loss is suppressed. Reduction is suppressed.
  • the RFIC chip 34 is incorporated in the RFIC module 16 together with a matching circuit (four inductance elements 36A to 36D) for matching the RFIC chip 34 and the antenna 14, and the antenna 14 It is connected to the.
  • a matching circuit four inductance elements 36A to 36D for matching the RFIC chip 34 and the antenna 14, and the antenna 14 It is connected to the.
  • the embodiment of the present invention is not limited to this.
  • FIG. 10 is an exploded perspective view of an RFID tag according to another embodiment.
  • symbol is attached
  • the RFIC chip 34 is provided on the main body 114a of the antenna 114 having an inverted F antenna shape without being modularized. Specifically, the first input / output terminal of the RFIC chip 34 is connected to the connection-side conductor portion 114k in the feed line portion of the antenna 114, and the second input / output terminal is connected to the radiation-side conductor portion 114j. Matching between the antenna 114 and the RFIC chip 34 can be achieved by setting the connection-side conductor 114k to an appropriate length, that is, by adjusting the inductance of the connection-side conductor 114k.
  • a spacer portion for providing a space between the main body portion 14 a of the antenna 14 and the cap-shaped member 12. 12g and the engaging pin part 12h for fixing the antenna 14 to the cap-shaped member 12 are integrated.
  • the spacer portion 12g and the engagement pin portion 12h may be provided at different locations and separated from each other. Further, the number of the spacer portions 12g and the engaging pin portions 12h may be different.
  • the engagement pin part 12h is the number which can be fixed to the cap-shaped member 12 in a state where the entire main body part 14a of the antenna 14 is maintained parallel to the back surface 12d of the top plate part 12a of the cap-shaped member 12.
  • the antenna support portion may be in any form for supporting the antenna as long as a space can be provided between the main body portion of the antenna and the top plate portion of the casing member.
  • connection portion 14 b of the antenna 14 is connected to the metal surface Wa of the article W via a direct current via the conductor plate 18. Or capacitively coupled.
  • the connecting portion of the antenna may be connected to the metal surface of the article in a direct current manner or not capacitively coupled without passing through the conductor plate. In this case, the RFID tag can omit the conductor plate.
  • the casing member that protects and holds the RFIC chip 34 (RFIC module 16) and the antenna 14 has a cap shape that defines a sealed internal space R.
  • the casing member may be provided with a hole that communicates the internal space with the outside when attached to a metal surface.
  • the top plate support part of the casing member may be two flat side wall parts parallel to each other. Further, for example, the top plate support portion may be four column portions (in this case, the casing member has a table shape).
  • the metal surface Wa of the article W to which the RFID tag 10 is attached is a flat surface, but the embodiment according to the present invention is not limited to this.
  • the metal surface may be a curved surface such as a gas cylinder.
  • the casing member has flexibility.
  • the opening edge part is equipped with the shape which can be engaged with a curved surface.
  • the wireless communication device can be used by attaching to various objects having a metal surface of any shape, for example, a metal surface such as an office desk or a drum can, and a non-metal surface. It can be used even if it is attached to.
  • the antenna 14 is in the form of an inverted F antenna, but is not limited thereto.
  • an inverted L antenna may be used.
  • the wireless communication device may be configured to detect at least one of the ambient temperature and humidity and output the detection result to the outside.
  • a temperature sensor and a humidity sensor are incorporated in the RFIC chip.
  • a temperature sensor and a humidity sensor are provided in the RFIC module together with the RFIC chip.
  • the temperature sensor can detect the temperature outside the cap-shaped member with high accuracy. More specifically, the temperature sensor indirectly detects the external temperature by substantially detecting the temperature of the cap-shaped member that is in contact with the outside air. Therefore, unlike the case where the module with the temperature sensor is provided away from the cap-like member through the space, the temperature sensor is high even if the external temperature changes drastically in a short time. The external temperature can be detected with high accuracy.
  • the cap-like member is provided with a communication hole for communicating the internal space with the outside.
  • the wireless communication device is a wireless communication device that can be used while attached to a metal surface of an article, and is opposed to the metal surface with a space therebetween.
  • a casing member including a top plate portion provided with a back surface, a top plate support portion erected on the back surface side from the top plate portion, a main body portion provided on the back surface of the top plate portion of the casing member, and the main body portion
  • An antenna including a connection portion extending from the metal surface toward the metal surface and connected to the metal surface in a direct current manner or capacitively coupled to the top surface of the casing member and connected to the antenna
  • An antenna support that supports the antenna body in a state where the casing member further provides a space between the top plate and the antenna body.
  • a holding part is provided.
  • the present invention is applicable to a wireless communication device such as an RFID tag that can be used by being attached to a metal surface.
  • Wireless communication devices RFID tags
  • Casing member cap-shaped member
  • Top plate part 12b
  • Top plate support part 12e
  • Antenna support part 14e
  • Antenna 14a
  • Body part 14b
  • Connection part 16 RFIC chip (RFIC module) W Article Wa Metal surface

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  • 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)

Abstract

L'invention concerne un dispositif de communication sans fil (10) qui comprend : un élément de boîtier (12) qui comprend une plaque supérieure (12a) pourvue d'une surface arrière (12d) opposée à une surface métallique (Wa) avec un espace entre elles et un support de plaque supérieure (12b) qui se dresse verticalement sur le côté de surface arrière à partir de la plaque supérieure (12a); une antenne (14) qui comprend un corps (14a) disposé sur la surface arrière (12d) de la plaque supérieure (12a) de l'élément de boîtier (12), et une partie de connexion (14b) s'étendant depuis le corps (14a) vers la surface métallique (Wa) et connectée à la surface métallique (Wa) par l'intermédiaire d'une connexion de courant continu ou selon un couplage capacitif ; et une puce RFIC (16) qui est disposée sur la surface arrière (12d) de la plaque supérieure (12a) de l'élément de boîtier (12) et qui est connectée à l'antenne (14). L'élément de boîtier (12) est en outre pourvu de supports d'antenne (12e) qui supportent le corps (14a) dans un état dans lequel un espace est ménagé entre la plaque supérieure (12a) et le corps (14a) de l'antenne (14).
PCT/JP2019/002248 2018-05-11 2019-01-24 Dispositif de communication sans fil et article pourvu du dispositif de communication sans fil Ceased WO2019215963A1 (fr)

Priority Applications (1)

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JP2019528944A JP6601597B1 (ja) 2018-05-11 2019-01-24 無線通信デバイス、およびそれを備えた物品

Applications Claiming Priority (2)

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JP2018091998 2018-05-11
JP2018-091998 2018-05-11

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Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2014199861A1 (fr) * 2013-06-14 2014-12-18 株式会社村田製作所 Dispositif d'antenne et dispositif de terminal de communication
WO2017014152A1 (fr) * 2015-07-21 2017-01-26 株式会社村田製作所 Dispositif de communication sans fil, et article équipé de celui-ci
JP2017045469A (ja) * 2016-11-07 2017-03-02 富士通コンポーネント株式会社 メモリカード

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2014199861A1 (fr) * 2013-06-14 2014-12-18 株式会社村田製作所 Dispositif d'antenne et dispositif de terminal de communication
WO2017014152A1 (fr) * 2015-07-21 2017-01-26 株式会社村田製作所 Dispositif de communication sans fil, et article équipé de celui-ci
JP2017045469A (ja) * 2016-11-07 2017-03-02 富士通コンポーネント株式会社 メモリカード

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