WO2013187013A1 - 無線装置 - Google Patents
無線装置 Download PDFInfo
- Publication number
- WO2013187013A1 WO2013187013A1 PCT/JP2013/003534 JP2013003534W WO2013187013A1 WO 2013187013 A1 WO2013187013 A1 WO 2013187013A1 JP 2013003534 W JP2013003534 W JP 2013003534W WO 2013187013 A1 WO2013187013 A1 WO 2013187013A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- circuit board
- conductor
- wireless device
- ground
- metal casing
- Prior art date
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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 a wireless device for a flow rate measuring device that measures the flow rate of an object to be weighed.
- an automatic meter reading system that measures the amount of gas, electricity, water, etc. used by a flow rate measuring device installed in a building such as a house and collects the measured data by wireless communication.
- a small flow rate measuring device is required from the viewpoint of ease of installation and the like.
- a flow rate measuring device for example, a device in which a wireless adapter slave unit is attached to the surface of a metal housing of a gas meter has been proposed (see Patent Document 1).
- the wireless adapter slave described in Patent Document 1 incorporates a board-mounted plate antenna.
- the ground conductor plate and the short-circuit conductor of the radiating conductor are connected via the wiring pattern of the printed circuit board.
- the metal housing of the gas meter can be used as a radiation (anti-radiation) conductor, high antenna performance can be realized.
- a current flows radially into the metal casing from a position close to the feeding point to the antenna, the reverse-phase currents cancel each other's effects, so that the radiation efficiency deteriorates.
- the radiation conductor is small with respect to the wavelength, the radiation efficiency is significantly degraded.
- An object of the present invention is to provide a wireless device that improves antenna performance by effectively using a metal casing of a flow rate measuring device.
- a wireless device is a wireless device of a flow rate measuring device, wherein the metal housing of the flow rate measuring device, a radiation conductor that radiates a radio wave forming a high frequency signal, and a power supply that supplies high frequency power to the radiation conductor
- a circuit board having a circuit, and the circuit board has a feeding point that electrically connects the feeding circuit and the radiation conductor, and the feeding point is located at an end of the metal casing. It is characterized by. Since the feeding point is located at the end of the metal casing, deterioration of radiation efficiency due to the reverse phase current is suppressed.
- FIG. 1 is a front view
- FIG. 2 is a side view
- FIG. 3 is a perspective view of a wireless communication unit.
- the gas meter of the present embodiment includes a metal casing 201, a meter display unit 202, and a resin casing 102 attached to the surface of the metal casing 201.
- a radio communication unit composed of a plate-shaped radiation conductor 104 that forms the main part of the plate-shaped inverted F-type antenna, a circuit board 103 including a power feeding circuit, and a ground conductor 107. It is stored.
- 105 is a power supply terminal from the circuit board 103 to the radiation conductor 104
- 106 is a short-circuit terminal between the radiation conductor 104 and the circuit board 103
- 108 is a ground terminal between the circuit board 103 and the ground conductor 107. is there.
- the circuit board 103 is, for example, a double-sided copper-clad board, and a power feeding circuit, a control circuit, and the like are mounted on the surface of the board.
- the radiation conductor 104 is disposed in parallel with the circuit board 103 at a certain distance from the surface of the circuit board 103.
- the power supply terminal 105 is disposed orthogonal to the surface direction of the radiation conductor 104, and one end is electrically connected to the power supply circuit disposed on the circuit board 103 at the end of the circuit board 103, and the other end is connected. It is electrically connected to the end of the radiation conductor 104.
- the short-circuit terminal 106 is arranged orthogonal to the surface direction of the radiation conductor 104, and one end is electrically connected to the ground formed by the copper foil pattern on the circuit board 103. The end is electrically connected to the radiation conductor 104.
- the ground conductor 107 is arranged in parallel with the circuit board 103 on the back side of the circuit board 103.
- the ground terminal 108 is arranged orthogonal to the surface direction of the ground conductor 107, one end is electrically connected to the ground formed by the copper foil pattern on the circuit board 103, and the other end is the end of the ground conductor 107. It is electrically connected to the part.
- the connection position between the circuit board 103 and the ground terminal 108 is arranged at a distance from the position where the short-circuit terminal 106 is connected to the circuit board 103.
- the wireless communication unit composed of the radiation conductor 104, the circuit board 103, and the ground conductor 107 is disposed in the resin casing 102 so that the feeding terminal 105 is positioned at the end of the metal casing 201.
- the ground conductor 107 and the metal casing 201 are disposed so as to be close to each other, the ground conductor 107 and the metal casing 201 are electromagnetically coupled. It can be regarded as the same potential. That is, the metal casing 201 operates as a ground for the plate-like inverted F-type antenna. Thereby, since a large antenna ground area can be ensured even in a small wireless terminal, high radiation efficiency can be realized.
- FIG. 4 (a) and 4 (b) are conceptual diagrams showing the distribution of current flowing through the ground conductor 107 in accordance with the position of the ground terminal 108.
- FIG. 4A since the ground terminal 108 is located in the center of the ground conductor 107, the currents of opposite phases cancel each other's effects. Therefore, the radiation efficiency is degraded.
- FIG. 4B since the ground terminal 108 is located at the end of the ground conductor 107 as in the present embodiment, a reverse-phase current does not occur, and deterioration of radiation efficiency is suppressed. The same applies to the distribution of current flowing through the radiation conductor 104 according to the position of the power supply terminal 105.
- FIG. 5 shows a linear inverted L-type antenna as a modification of the wireless communication unit of FIG.
- reference numeral 301 denotes a linear radiation conductor
- reference numeral 302 denotes a feeding point from the circuit board 103 to the radiation conductor 301.
- the circuit board 103 has a feeding point 302 at the end of the circuit board 103.
- the wireless communication unit is arranged in a direction in which the feeding point 302 is located at the end of the metal casing 201.
- the ground conductor 107 is connected to the ground terminal 108 of the circuit board 103 in the vicinity of the feeding point 302.
- FIG. 6 is a front view showing a configuration of a gas meter which is a flow rate measuring device including a wireless device according to the second embodiment of the present invention.
- the gas meter includes a metal casing 410 connected to the pipe 412 and a resin casing 422 attached to the surface of the metal casing 410.
- the metal housing 410 has a built-in sensor (not shown) that measures the gas flow rate.
- a circuit board for measurement 427, a battery 428, a radiation conductor 440, and a circuit board for wireless communication 441 are arranged in the resin casing 422.
- the resin casing 422 is fixed to the surface of the metal casing 410 with conductive screws 423 to 425.
- the circuit board for measurement 427 is at the upper center in the resin casing 422, the circuit board for wireless communication 441 is at the lower end of the resin casing 422, and the battery 428 having metal terminals is separated from the circuit board for wireless communication 441 as much as possible. Are arranged respectively.
- the measurement circuit board 427 and the wireless communication circuit board 441 are connected by a wiring 431, and the battery 428 and the wireless communication circuit board 441 are connected by a wiring 429, respectively.
- a power supply circuit 445 that supplies a high-frequency signal to the radiation conductor 440 is mounted on the circuit board 441 for wireless communication.
- a feeding point 442 to the radiation conductor 440 is located at an end of the circuit board 441 for wireless communication.
- the ground of the circuit board 441 for wireless communication that is, the ground of the power feeding circuit 445 is electrically connected to the metal housing 410 via the lead wire 443 and one screw 423 at the joint position 444.
- the metal casing 410 has substantially the same potential as the ground of the power feeding circuit 445.
- the metal casing 410 having a large area functions as the ground.
- the joining position 444 of the conducting wire 443 and the ground of the radio communication circuit board 441, the conducting wire 443 and the screw 423 are in the vicinity of the feeding point 442 and arranged in the direction opposite to the radiation conductor 440 with respect to the feeding point 442. It is preferred that
- the radiation conductor 440 radiates a high frequency signal modulated by the transmission circuit as a radio wave, or receives an external radio wave (high frequency signal) and passes it to a reception circuit that demodulates the radio wave.
- the radiation conductor 440 according to the present embodiment constitutes a linear inverted L-type antenna, has a thin rod shape, and is formed of a conductive material such as copper.
- the length of the radiating conductor 440 is set to ⁇ / 4, where ⁇ is the wavelength of the high frequency signal forming the radio signal.
- the base end of the radiation conductor 440 is connected to the output portion of the circuit board 441 for wireless communication at a feeding point 442.
- the radiating conductor 440 is bent so as to spread in the internal space of the resin casing 422 so as to be located as far as possible from the metal casing 410 and so that each part of the radiating conductor 440 is not as close as possible.
- the above-described ground conductor technology or the ground area (ground area) of the wireless communication circuit board 411 may be used as the ground conductor.
- the ground conductor is disposed between the wireless communication circuit board 441 and the metal housing 410 in a state of being insulated from the metal housing 410 by the resin housing 422, and is connected to the wireless communication circuit in the vicinity of the feeding point 442. It is electrically connected to the ground of the substrate 441.
- an electrolytic capacitor having a metal case and the like should be as far away from the feeding point 442 as possible.
- the plate-like inverted F antenna and the linear inverted L antenna have been described.
- the shape is not limited to these antenna shapes.
- a plate-shaped dipole antenna, a loop antenna, a meander line antenna, or the like may be used.
- the wireless device according to the present invention is useful as a wireless device with improved antenna performance.
Landscapes
- Support Of Aerials (AREA)
- Details Of Aerials (AREA)
- Measuring Volume Flow (AREA)
- Details Of Flowmeters (AREA)
- Arrangements For Transmission Of Measured Signals (AREA)
Abstract
Description
図1、図2及び図3は、本発明の第1の実施形態に係る無線装置を備えた流量計測装置であるガスメータの構成を示している。図1は正面図であり、図2は側面図であり、図3は無線通信部の斜視図である。
図6は、本発明の第2の実施形態に係る無線装置を備えた流量計測装置であるガスメータの構成を示す正面図である。
103 回路基板
104 放射導体
105 給電端子
106 短絡端子
107 接地導体
108 接地端子
201 金属筐体
202 メータ表示部
301 放射導体
302 給電点
410 金属筐体
412 管路
422 樹脂筐体
423~425 ビス
427 計量用回路基板
428 バッテリ
429 配線
431 配線
440 放射導体
441 無線通信用回路基板
442 給電点
443 導線
444 接合位置
445 給電回路
Claims (5)
- 流量計測装置の無線装置であって、
前記流量計測装置の金属筐体と、
高周波信号をなす電波を放射する放射導体と、
前記放射導体へ高周波電力を供給する給電回路を持つ回路基板とを備え、
前記回路基板は、前記給電回路と前記放射導体とを電気的に接続する給電点を有し、
前記給電点は、前記金属筐体の端部に位置することを特徴とする無線装置。 - 請求項1記載の無線装置において、
前記回路基板は、当該回路基板の端部に前記給電点を有することを特徴とする無線装置。 - 請求項1記載の無線装置において、
前記回路基板と前記金属筐体との間にて前記金属筐体から絶縁された状態で配置された接地導体を更に備え、
前記接地導体は、前記給電点の近傍にて前記回路基板の接地端子に電気接続されたことを特徴とする無線装置。 - 請求項1記載の無線装置において、
前記金属筐体は、前記給電点の近傍にて前記回路基板の接地端子に電気接続されたことを特徴とする無線装置。 - 請求項1記載の無線装置において、
前記回路基板に電気接続されたバッテリを更に備え、
前記バッテリは、前記給電点から離して配置されたことを特徴とする無線装置。
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2014520907A JPWO2013187013A1 (ja) | 2012-06-15 | 2013-06-05 | 無線装置 |
CN201380031678.XA CN104364963A (zh) | 2012-06-15 | 2013-06-05 | 无线装置 |
EP13804999.4A EP2863474A4 (en) | 2012-06-15 | 2013-06-05 | WIRELESS DEVICE |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2012135692 | 2012-06-15 | ||
JP2012-135692 | 2012-06-15 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2013187013A1 true WO2013187013A1 (ja) | 2013-12-19 |
Family
ID=49757859
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/JP2013/003534 WO2013187013A1 (ja) | 2012-06-15 | 2013-06-05 | 無線装置 |
Country Status (4)
Country | Link |
---|---|
EP (1) | EP2863474A4 (ja) |
JP (1) | JPWO2013187013A1 (ja) |
CN (1) | CN104364963A (ja) |
WO (1) | WO2013187013A1 (ja) |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP2827442A1 (de) * | 2013-07-18 | 2015-01-21 | Diehl Metering Systems GmbH | Datensender eines Messdaten-Erfassungsgerätes |
US20160301124A1 (en) * | 2015-04-09 | 2016-10-13 | Foxconn Interconnect Technology Limited | Antenna and antenna assembly |
JP2018530213A (ja) * | 2015-09-02 | 2018-10-11 | クアルコム,インコーポレイテッド | ローアングル放射短尺半パッチアンテナ |
JP2020028039A (ja) * | 2018-08-13 | 2020-02-20 | セイコーエプソン株式会社 | 電子機器 |
Citations (5)
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 |
WO2008020562A1 (fr) * | 2006-08-17 | 2008-02-21 | Kabushiki Kaisha Toshiba | Dispositif électronique |
JP2008072686A (ja) * | 2006-04-10 | 2008-03-27 | Hitachi Metals Ltd | 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 |
WO2012070242A1 (ja) * | 2010-11-25 | 2012-05-31 | パナソニック株式会社 | 無線機 |
Family Cites Families (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP4337817B2 (ja) * | 2003-04-24 | 2009-09-30 | 旭硝子株式会社 | アンテナ装置 |
JP2010278750A (ja) * | 2009-05-28 | 2010-12-09 | Panasonic Corp | 携帯無線機 |
ES2758924T3 (es) * | 2012-03-29 | 2020-05-07 | Panasonic Corp | Aparato de medición de volumen de flujo |
-
2013
- 2013-06-05 JP JP2014520907A patent/JPWO2013187013A1/ja active Pending
- 2013-06-05 EP EP13804999.4A patent/EP2863474A4/en not_active Ceased
- 2013-06-05 WO PCT/JP2013/003534 patent/WO2013187013A1/ja active Application Filing
- 2013-06-05 CN CN201380031678.XA patent/CN104364963A/zh active Pending
Patent Citations (5)
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 |
JP2008072686A (ja) * | 2006-04-10 | 2008-03-27 | Hitachi Metals Ltd | 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 |
WO2012070242A1 (ja) * | 2010-11-25 | 2012-05-31 | パナソニック株式会社 | 無線機 |
Non-Patent Citations (1)
Title |
---|
See also references of EP2863474A4 * |
Cited By (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP2827442A1 (de) * | 2013-07-18 | 2015-01-21 | Diehl Metering Systems GmbH | Datensender eines Messdaten-Erfassungsgerätes |
US20160301124A1 (en) * | 2015-04-09 | 2016-10-13 | Foxconn Interconnect Technology Limited | Antenna and antenna assembly |
US9917351B2 (en) * | 2015-04-09 | 2018-03-13 | Foxconn Interconnect Technology Limited | Antenna and antenna assembly |
JP2018530213A (ja) * | 2015-09-02 | 2018-10-11 | クアルコム,インコーポレイテッド | ローアングル放射短尺半パッチアンテナ |
JP2020028039A (ja) * | 2018-08-13 | 2020-02-20 | セイコーエプソン株式会社 | 電子機器 |
JP7147355B2 (ja) | 2018-08-13 | 2022-10-05 | セイコーエプソン株式会社 | 電子機器 |
Also Published As
Publication number | Publication date |
---|---|
CN104364963A (zh) | 2015-02-18 |
EP2863474A4 (en) | 2015-05-27 |
EP2863474A1 (en) | 2015-04-22 |
JPWO2013187013A1 (ja) | 2016-02-04 |
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