EP2863474A1 - Drahtlose vorrichtung - Google Patents

Drahtlose vorrichtung Download PDF

Info

Publication number
EP2863474A1
EP2863474A1 EP20130804999 EP13804999A EP2863474A1 EP 2863474 A1 EP2863474 A1 EP 2863474A1 EP 20130804999 EP20130804999 EP 20130804999 EP 13804999 A EP13804999 A EP 13804999A EP 2863474 A1 EP2863474 A1 EP 2863474A1
Authority
EP
European Patent Office
Prior art keywords
circuit board
power supply
metal housing
ground
radiation conductor
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
EP20130804999
Other languages
English (en)
French (fr)
Other versions
EP2863474A4 (de
Inventor
Takashi Watanabe
Yukihiro Omoto
Takayuki Matsumoto
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.)
Panasonic Intellectual Property Management Co Ltd
Original Assignee
Panasonic Intellectual Property Management 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 Panasonic Intellectual Property Management Co Ltd filed Critical Panasonic Intellectual Property Management Co Ltd
Publication of EP2863474A1 publication Critical patent/EP2863474A1/de
Publication of EP2863474A4 publication Critical patent/EP2863474A4/de
Ceased legal-status Critical Current

Links

Images

Classifications

    • 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
    • H01Q9/30—Resonant antennas with feed to end of elongated active element, e.g. unipole
    • H01Q9/42—Resonant antennas with feed to end of elongated active element, e.g. unipole with folded element, the folded parts being spaced apart a small fraction of the operating wavelength
    • 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
    • H01Q1/2233—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 used in consumption-meter devices, e.g. electricity, gas or water meters
    • 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
    • H01Q9/0407—Substantially flat resonant element parallel to ground plane, e.g. patch antenna
    • H01Q9/0421—Substantially flat resonant element parallel to ground plane, e.g. patch antenna with a shorting wall or a shorting pin at one end of the element

Definitions

  • the present invention relates to wireless devices for flowmeters configured to measure a quantity of flow of a target.
  • a gas meter with a metal housing on which a slave unit of a wireless adapter is mounted is suggested as an example of the flowmeters of this type (see Patent Document 1).
  • the slave unit of the wireless adapter described in Patent Document 1 includes therein a board-mounted plate-like antenna.
  • the board-mounted plate-like antenna is configured such that a ground conductor plate is in connection to a short-circuit conductor of a radiation conductor via a wiring pattern of a printed circuit board.
  • PATENT DOCUMENT 1 Japanese Unexamined Patent Publication No. H10-313212
  • High antenna performance can be achieved by utilizing the metal housing of a gas meter as a radiation conductor (a reflection conductor).
  • a radiation conductor a reflection conductor
  • a wireless device of the present invention is a wireless device for a flowmeter, including: a metal housing of the flowmeter, a radiation conductor configured to radiate a radio wave which is a high frequency signal, and a circuit board including a power supply circuit configured to supply high frequency power to the radiation conductor, wherein the circuit board has a power supply point which electrically connects the power supply circuit to the radiation conductor, and the power supply point is positioned in a corner portion of the metal housing.
  • the configuration in which the power supply point is positioned in the corner portion of the metal housing results in reduction of the loss of the radiation efficiency which could be caused by the currents of opposite phases.
  • the present invention has an advantage that wireless devices with improved antenna performance can be provided.
  • FIGS. 1-3 illustrate a configuration of a gas meter which is a flowmeter including a wireless device according to a first embodiment of the present invention.
  • FIG. 1 is a front view
  • FIG. 2 is a side view of the gas meter.
  • FIG. 3 is a perspective view of a wireless communication unit.
  • the gas meter of this embodiment includes a metal housing 201, a meter display 202, and a resin housing 102 mounted on a surface of the metal housing 201.
  • the wireless communication unit including a plate-like radiation conductor 104 forming a main part of an inverted F-shaped plate-like antenna, a circuit board 103 equipped with a power supply circuit, and a ground conductor 107 are housed.
  • Reference numeral 105 denotes a power supply terminal for supplying power from the circuit board 103 to the radiation conductor 104.
  • Reference numeral 106 denotes a short-circuit terminal provided between the radiation conductor 104 and the circuit board 103.
  • Reference numeral 108 denotes a ground terminal provided between the circuit board 103 and the ground conductor 107.
  • the circuit board 103 is, e.g., a board with copper-clad surfaces.
  • the power supply circuit, a control circuit, and the like are mounted on the front surface of the circuit board 103.
  • the radiation conductor 104 is spaced from the front surface of the circuit board 103 and disposed in parallel with the circuit board 103.
  • the power supply terminal 105 is disposed perpendicularly to a plane of the radiation conductor 104.
  • the power supply terminal 105 has an end electrically connected to the power supply circuit mounted on the circuit board 103 in an edge portion of the circuit board 103, and the other end electrically connected to an edge portion of the radiation conductor 104.
  • the short-circuit terminal 106 is disposed perpendicularly to a plane of the radiation conductor 104, in a manner similar to the power supply terminal 105.
  • the short-circuit terminal 106 has an end electrically connected to a ground made of a copper foil pattern provided on the circuit board 103, and the other end electrically connected to the radiation conductor 104.
  • the ground conductor 107 is disposed near the back surface of the circuit board 103 and in parallel with the circuit board 103.
  • the ground terminal 108 is disposed perpendicularly to a plane of the ground conductor 107.
  • the ground terminal 108 has an end electrically connected to the ground made of the copper foil pattern provided on the circuit board 103, and the other end electrically connected to a corner portion of the ground conductor 107.
  • the point of connection between the circuit board 103 and the ground terminal 108 is spaced from the point of connection between the short-circuit terminal 106 and the circuit board 103.
  • the wireless communication unit including the radiation conductor 104, the circuit board 103, and the ground conductor 107 is oriented, in the resin housing 102, such that the power supply terminal 105 is positioned near a corner of metal housing 201.
  • the ground conductor 107 of the wireless communication unit thus orientated is positioned close to the metal housing 201, and consequently, the ground conductor 107 and the metal housing 201 are electromagnetically coupled to each other.
  • the metal housing 201 and the ground conductor 107 can be considered to be at the same potential with respect to high frequency.
  • the metal housing 201 is caused to function as a ground for the inverted F-shaped plate-like antenna. With this configuration, a large space for a ground of an antenna can be ensured even in small wireless terminal equipment, and consequently, high radiation efficiency can be achieved.
  • FIGS. 4A and 4B are diagrams each illustrating distribution of currents passing through the ground conductor 107 in relation to the position of the ground terminal 108.
  • FIG. 4A where the ground terminal 108 is positioned at the middle of an edge of the ground conductor 107, since the effects of currents of opposite phases cancel each other, loss of the radiation efficiency is caused.
  • FIG. 4B where the ground terminal 108 is positioned in a corner portion of the ground conductor 107, since the phases of the currents are not opposite to each other, loss of the radiation efficiency is reduced. This theory holds for distribution of currents passing through the radiation conductor 104 in relation to the position of the power supply terminal 105.
  • FIG. 5 illustrates a variation of the wireless communication unit of FIG. 3 .
  • This variation includes an inverted L-shaped linear antenna.
  • reference numeral 301 denotes a linear radiation conductor
  • reference numeral 302 denotes a power supply point for supplying power from the circuit board 103 to the radiation conductor 301.
  • the power supply point 302 is located in an edge portion of the circuit board 103.
  • this wireless communication unit is oriented such that the power supply point 302 is positioned near a corner of the metal housing 201. In the vicinity of the power supply point 302, the ground conductor 107 is in connection to the ground terminal 108 of the circuit board 103.
  • FIG. 6 is a front view illustrating a configuration of a gas meter which is a flowmeter including a wireless device according to a second embodiment of the present invention.
  • the gas meter of this embodiment includes a metal housing 410 connected to pipes 412 and a resin housing 422 mounted on a surface of the metal housing 410.
  • a sensor (not shown) configured to measure a quantity of gas is housed.
  • a measurement circuit board 427, a battery 428, a radiation conductor 440, and a wireless communication circuit board 441 are arranged in the resin housing 422.
  • the resin housing 422 is fastened to the surface of the metal housing 410 by means of conductive screws 423-425.
  • the measurement circuit board 427 is located at the middle of an upper portion of the interior of the resin housing 422.
  • the wireless communication circuit board 441 is located near a lower corner of the interior of the resin housing 422.
  • the battery 428 having metal terminals is positioned as far as possible from the wireless communication circuit board 441.
  • An interconnect wire 431 connects the measurement circuit board 427 to the wireless communication circuit board 441.
  • An interconnect wire 429 connects the battery 428 to the wireless communication circuit board 441.
  • a power supply circuit 445 configured to supply a high frequency signal to the radiation conductor 440 is mounted on the wireless communication circuit board 441.
  • a power supply point 442 for the radiation conductor 440 is located in a corner portion of the wireless communication circuit board 441.
  • a ground of the wireless communication circuit board 441, i.e., a ground of the power supply circuit 445 is in electrical connection to the metal housing 410 at a joint point 444, via a lead wire 443 and the screw 423.
  • joint point 444 of the lead wire 443 and the ground of the wire communication circuit board 441, the lead wire 443, and the screw 423 are located in the vicinity of the power supply point 442, and opposite to the radiation conductor 440 with respect to the power supply point 442.
  • the radiation conductor 440 radiates, as a radio wave, the high frequency signal having been modulated by a transmitter circuit.
  • the radiation conductor 440 also receives an external radio wave (an external high frequency signal) and forwards the radio wave to a receiver circuit which demodulates the radio wave.
  • the radiation conductor 440 of this embodiment functions as the inverted L-shaped linear antenna, is in a thin rod shape, and is made of a conductive material such as copper.
  • the length of the radiation conductor 440 is set to ⁇ /4, where ⁇ is the wavelength of the high frequency signal which is the radio signal.
  • a base end of the radiation conductor 440 is in connection to an output section of the wireless communication circuit board 441.
  • the radiation conductor 440 is positioned as far as possible from the metal housing 410.
  • the radiation conductor 440 is bended and disposed, in the interior of the resin housing 422, such that the portions between the bend points are positioned as far as possible from one another.
  • the above-described technique with the use of the ground conductor may be employed.
  • the ground area of the wireless communication circuit board 411 may be used as the ground conductor. If this is the case, the ground conductor is disposed between the wireless communication circuit board 441 and the metal housing 410, insulated from the metal housing 410 by the resin housing 422, and electrically connected to the ground of the wireless communication circuit board 441 in the vicinity of the power supply point 442.
  • a component housed in a metal case such as an electrolytic capacitor is desirably positioned as far as possible from the power supply point 442.
  • the inverted F-shaped plate-like antenna and the inverted L-shaped linear antenna have been described.
  • the present invention is not limited to the antennas in these shapes.
  • the antenna of the present invention may be, e.g., a plate-like dipole antenna, a loop antenna, or a meander line antenna.
  • the present invention is useful for wireless devices providing improved antenna performance.

Landscapes

  • Support Of Aerials (AREA)
  • Arrangements For Transmission Of Measured Signals (AREA)
  • Details Of Aerials (AREA)
  • Measuring Volume Flow (AREA)
  • Details Of Flowmeters (AREA)
EP13804999.4A 2012-06-15 2013-06-05 Drahtlose vorrichtung Ceased EP2863474A4 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2012135692 2012-06-15
PCT/JP2013/003534 WO2013187013A1 (ja) 2012-06-15 2013-06-05 無線装置

Publications (2)

Publication Number Publication Date
EP2863474A1 true EP2863474A1 (de) 2015-04-22
EP2863474A4 EP2863474A4 (de) 2015-05-27

Family

ID=49757859

Family Applications (1)

Application Number Title Priority Date Filing Date
EP13804999.4A Ceased EP2863474A4 (de) 2012-06-15 2013-06-05 Drahtlose vorrichtung

Country Status (4)

Country Link
EP (1) EP2863474A4 (de)
JP (1) JPWO2013187013A1 (de)
CN (1) CN104364963A (de)
WO (1) WO2013187013A1 (de)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102013012041B4 (de) * 2013-07-18 2015-03-26 Diehl Metering Systems Gmbh Datensender eines Messdaten-Erfassungsgerätes
TWI671945B (zh) * 2015-04-09 2019-09-11 英屬開曼群島商鴻騰精密科技股份有限公司 天線及其組合
US9865926B2 (en) * 2015-09-02 2018-01-09 Qualcomm Incorporated Low angle radiating shorted half patch antenna
JP7147355B2 (ja) * 2018-08-13 2022-10-05 セイコーエプソン株式会社 電子機器

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH09232841A (ja) * 1996-02-28 1997-09-05 Matsushita Electric Ind Co Ltd アンテナの配置方法
JPH10313212A (ja) 1997-05-12 1998-11-24 Matsushita Electric Ind Co Ltd 基板実装形板状アンテナ
JP4337817B2 (ja) * 2003-04-24 2009-09-30 旭硝子株式会社 アンテナ装置
JP5061689B2 (ja) * 2006-04-10 2012-10-31 日立金属株式会社 アンテナ装置及びそれを用いたマルチバンド型無線通信機器
WO2008020562A1 (fr) * 2006-08-17 2008-02-21 Kabushiki Kaisha Toshiba Dispositif électronique
JP2010278750A (ja) * 2009-05-28 2010-12-09 Panasonic Corp 携帯無線機
ES2644294T3 (es) * 2010-11-25 2017-11-28 Panasonic Corporation Dispositivo inalámbrico
WO2013145720A1 (ja) * 2012-03-29 2013-10-03 パナソニック株式会社 流量計測装置

Also Published As

Publication number Publication date
WO2013187013A1 (ja) 2013-12-19
CN104364963A (zh) 2015-02-18
EP2863474A4 (de) 2015-05-27
JPWO2013187013A1 (ja) 2016-02-04

Similar Documents

Publication Publication Date Title
US9601831B2 (en) Radio device
EP2876821B1 (de) Drahtlose vorrichtung
EP3509160B1 (de) Drahtloskommunikationsvorrichtung
EP3106842B1 (de) Vorrichtung zur durchflussgeschwindigkeitsmessung und drahtloskommunikationsvorrichtung
US9939474B2 (en) Meter with communication function
EP2863474A1 (de) Drahtlose vorrichtung
EP2833476B1 (de) Vorrichtung zur messung der durchflussmenge
EP3077773B1 (de) Verbrauchsmessgerät mit faltbarer leiterplattenanordnung
US10243264B2 (en) Pit lid trident antenna arrangement
JP5304790B2 (ja) 無線装置とそれを備えた計測装置
JP2010088098A (ja) 計測装置及び計測装置から出力される計測値を送受信する無線装置
JP6221937B2 (ja) アンテナ装置
ES2785083T3 (es) Aparato de medición de cantidad de flujo y dispositivo inalámbrico para uso en el aparato de medición de cantidad de flujo
JPWO2018142995A1 (ja) 無線通信装置
EP2804257A1 (de) Durchflussmessvorrichtung und drahtlose Vorrichtung zur Verwendung in der Durchflussmessvorrichtung
EP2827447A1 (de) Antennenvorrichtung
CN104025378A (zh) 无线终端
EP3024091A1 (de) Drahtlose vorrichtung
JP2012227616A (ja) 無線通信装置

Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

17P Request for examination filed

Effective date: 20141028

AK Designated contracting states

Kind code of ref document: A1

Designated state(s): AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR

AX Request for extension of the european patent

Extension state: BA ME

RA4 Supplementary search report drawn up and despatched (corrected)

Effective date: 20150423

RIC1 Information provided on ipc code assigned before grant

Ipc: H01Q 1/24 20060101AFI20150417BHEP

Ipc: H01Q 9/38 20060101ALI20150417BHEP

DAX Request for extension of the european patent (deleted)
17Q First examination report despatched

Effective date: 20160317

REG Reference to a national code

Ref country code: DE

Ref legal event code: R003

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: THE APPLICATION HAS BEEN REFUSED

18R Application refused

Effective date: 20171006