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EP0738023A2 - Antennenvorrichtung - Google Patents

Antennenvorrichtung Download PDF

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Publication number
EP0738023A2
EP0738023A2 EP96105722A EP96105722A EP0738023A2 EP 0738023 A2 EP0738023 A2 EP 0738023A2 EP 96105722 A EP96105722 A EP 96105722A EP 96105722 A EP96105722 A EP 96105722A EP 0738023 A2 EP0738023 A2 EP 0738023A2
Authority
EP
European Patent Office
Prior art keywords
dielectric substrate
antenna device
antenna
radiator
circuit
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.)
Withdrawn
Application number
EP96105722A
Other languages
English (en)
French (fr)
Other versions
EP0738023A3 (de
Inventor
Teruhisa Tsuru
Harufumi Mandai
Koji Shiroki
Kenji Asakura
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
Publication of EP0738023A2 publication Critical patent/EP0738023A2/de
Publication of EP0738023A3 publication Critical patent/EP0738023A3/de
Withdrawn legal-status Critical Current

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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
    • H01Q9/0407—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
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q23/00—Antennas with active circuits or circuit elements integrated within them or attached to them

Definitions

  • the present invention relates to an antenna device, more particularly to a surface-mounted antenna device on which peripheral antenna circuits are mounted and which is for use in portable communication systems and wireless LANs (local area networks).
  • An example of a conventional antenna is a micro-strip type such as that shown in FIG. 7 and FIG. 8, which incorporates a high frequency amplifier and is used in portable communications equipment such as are used for the GPS (global positioning system) etc.
  • a patch electrode 52 is formed on the front surface of a dielectric substrate 51 having a rectangular shape.
  • a shield electrode 53 is formed on the rear surface of the dielectric substrate 51, and a printed circuit board 54 is attached to the rear surface.
  • a high frequency amplifier 56 formed from circuit elements 55 such as transistors and capacitors for example and a connector 58 connected to the high frequency amplifier 56 by a cable 57.
  • a signal feed terminal 59 extends from a signal feed point 52a of the patch electrode 52 to the printed circuit board 54.
  • the dielectric substrate 51, printed circuit board 54 and high frequency amplifier 56 are covered and molded with a packaging resin 60 to form an antenna device 50.
  • the antenna device 50 operates as an antenna for transmitting and receiving waves by means of the patch electrode 52.
  • the gain of the antenna device 50 is decreased, and in practice the length of the patch electrode 52 cannot be reduced to less than 1/10th of the wavelength.
  • the present invention can solve the aforementioned drawbacks associated with the conventional antenna device and provide an antenna device which includes peripheral circuits on a dielectric substrate, has a small body and excellent characteristics, and can be surface mounted.
  • An antenna device includes: a dielectric substrate having external electrodes and connecting electrodes at side surfaces thereof; circuit elements forming at least two peripheral antenna circuits provided in the interior and on the surface of the dielectric substrate; and a radiator whose cross-sectional shape is a substantial square bottomed U-shape, the radiator including a radiating portion formed in a flat shape, fixing portions depending from one pair of opposing end portions of the radiating portion, and a signal feed terminal and ground terminal which are integral with a foremost end of one of the fixing portions.
  • the radiator is attached with a space provided between the radiating portion of the radiator and a top surface of the dielectric base while the external electrodes are exposed outside of the radiator.
  • the circuit elements comprising at least two peripheral antenna circuits are formed in the interior and on the surface of the dielectric substrate miniaturization of the antenna device is facilitated. Also, by forming the circuit elements in the interior and on the surface of the dielectric substrate, the lower surface of the dielectric substrate can be made flat, enabling the antenna device to be surface mounted on a printed circuit board.
  • the circuit elements comprise at least a diode and a resistor which may form an antenna switch circuit, the diode and the resistor being formed in a substantially central portion of the front surface of the dielectric substrate.
  • a diode and a resistor forming an antenna switch circuit are formed in substantially the center portion of the surface of the dielectric substrate in a space between the dielectric substrate and the radiator, the diode and resistor forming the antenna switch circuit are not affected by waves generated by the edge portions of the radiator, and therefore can be completely isolated from the transmission input portion and the reception output portion of the antenna switch circuit.
  • an antenna device 10 includes a radiator 11 and a dielectric substrate 17.
  • the cross-sectional shape of the radiator 11 is substantially a square bottomed U-shape and the radiator 11 is made of copper or a copper alloy, for example.
  • the radiator 11 has a radiating portion 12 formed in a flat rectangular shape, and two fixing portions 13 and 14 bent at substantially 90° in a first direction (downward in FIGs. 1-3) from both short ends of the radiating portion 12, and a signal feed terminal 15 and ground terminal 16 being integrally formed at the foremost distal ends of the fixing portion 13.
  • a total length L of the fixing portion 13 and the feed terminal 15 (or the ground terminal 16) along the first direction, and the length of the fixing portion 13, are set to be greater than the thickness T of the dielectric substrate 17.
  • the fixing portion 13 itself has a shorter length than the fixing portion 14 in the first direction.
  • the dielectric substrate 17 has a rectangular shape and a multilayered structure including a plurality of ceramics sheets or resin sheets or the like.
  • a transmission input portion Tx, a reception output portion Rx, and control input portions Vc1 and Vc2 of an antenna switch circuit 18; an input/output terminal I/O of a band pass filter circuit 19; and a plurality of ground electrodes 20 are provided on a pair of opposing side surfaces of the dielectric substrate 17, i.e. both side surfaces in the lengthwise direction, while connecting electrodes 21a, 21b and 21c are provided on the other pair of other opposing side surfaces, i.e. both side surfaces in the width-wise direction.
  • circuit elements including a strip line 18a, a micro-strip line 18b, a capacitor 18c and a ground pattern 18d are formed in the interior of the dielectric substrate 17, while diodes 18e and resistors 18f are mounted in substantially the central portion on the surface of the dielectric substrate 17 to form the antenna switch circuit 18.
  • additional circuit elements including a micro-strip line 19a, a capacitor 19b, a via hole 19c and a ground pattern 19d are formed adjacent to the antenna switch circuit 18 in the interior of the dielectric substrate 17 to form the band pass filter circuit 19.
  • the circuit elements forming the antenna switch circuit 18 and the band pass filter circuit 19 are each connected by internal electrodes. Also, the antenna switch circuit 18 and the band pass filter circuit 19 are connected in the dielectric substrate 17.
  • the dielectric substrate 17 is inserted in the interior of the radiator 11, and the side surfaces of the dielectric substrate 17 in the width direction abut against the inner sides of the fixing portions 13 and 14, a space 22 is provided between the radiating portion 12 of the radiator 11 and the top surface of the dielectric substrate by making the total length L of the fixing portion 13 and the feed terminal 15 (or the ground terminal 16) and the same length L of the fixing portion 14 greater than the thickness T of the dielectric substrate 17.
  • the connecting electrode 21a of the dielectric substrate 17 is soldered to the fixing portion 14 of the radiator 11, and the connecting electrodes 21b and 21c of the dielectric substrate and the feed terminal 15 and ground terminal 16 of the radiator 11 are also joined by solder, to form antenna device 10.
  • FIGs. 4 and 5 show specific examples of equivalent circuits of the antenna switch circuit 18 and the band pass filter circuit 19, respectively.
  • FIG. 6 shows a block diagram of the antenna device 10 shown in FIGs. 1-3. Note that in FIG. 6, the input/output terminal I/O is disconnected from the feed terminal 15 for measuring an output power of the antenna device 10 before practical use. After measurement of the output power, the input/output terminal I/O and the feed terminal 15 are electrically connected with each other and the radiator 11 is electrically connected to the input/output terminal I/O.
  • the band pass filter circuit 19 and antenna switch circuit 18 are connected with each other by connecting a terminal 18g of the antenna switch circuit 18 and a terminal 19e of the band pass filter circuit 19.
  • the antenna switch circuit 18 selectively connects the terminal 18 and one of terminals Tx or Rx, in response to control voltages applied to terminals Vc1 and Vc2.
  • the terminal 18g is connected to the terminal Tx and isolated from the terminal Rx.
  • the terminal 18g is connected to the terminal Rx and isolated from the terminal Tx.
  • the antenna device 10 formed in this way is mounted on a printed circuit board having a wiring pattern printed thereon (not shown) and the transmission input portion Tx, reception output portion Rx, and control input portions Vc1 and Vc2 of the antenna switch circuit 18; and the input/output terminal I/O, ground electrodes 20 and ground terminal 16 of the band pass filter circuit 19 are surface-mounted on the wiring pattern by soldering.
  • an antenna signal circulates between the antenna switch circuit 18, band pass filter circuit 19 and radiating portion 12 via the feed terminal 15 to be transmitted or received from the radiating portion 12.
  • the antenna device 10 includes a plurality of peripheral antenna circuits, i.e. the antenna switch circuit 18 and the band pass filter circuit 19 in this example, by way of the strip line 18a, micro-strip line 18b, capacitor 18c, ground pattern 18d, diode 18e, resistor 18f, micro-strip line 19a, capacitor 19b, via hole 19c and ground pattern 19d, and because the antenna switch circuit 18 and band pass filter circuit 19 are mounted and incorporated in the dielectric substrate 17, the antenna device 10 can be easily miniaturized. Especially, incorporation of the band pass filter circuit 19 into the dielectric substrate 17 contributes to the miniaturization of the antenna device 10.
  • the antenna device 10 can be surface-mounted on a printed circuit board.
  • the diodes 18e and the resistors 18f which form the antenna switch circuit 18 are formed in substantially the central portion of the surface of the dielectric substrate 17 within the space 22 between the dielectric substrate 17 and the radiator 11, they are not affected by waves generated at the edge portions of the radiator 11, so total isolation of the transmission input portion Tx and the reception output portion Rx of the antenna switch circuit 18 can be achieved. It is preferable that the diodes 18e and the resistors 18f are apart from the edge portions of the radiator 11 with a distance of about 2 mm or more.
  • radiator 11 and the dielectric substrate 17 can also be joined by bonding them together with an adhesive rather than by soldering.
  • the shape of the radiating portion of the radiator 11 may be square rather than rectangular, and the shape of the dielectric substrate 17 may be a cubical rather than a rectangular prism, for example.
  • peripheral circuits such as a surface acoustic wave filter, a low pass filter, a duplexer, a high frequency amplifier, etc., instead of or in addition the antenna switch circuit 18 and band pass filter circuit 19, can be mounted and incorporated in the dielectric substrate 17.

Landscapes

  • Waveguide Aerials (AREA)
  • Details Of Aerials (AREA)
  • Input Circuits Of Receivers And Coupling Of Receivers And Audio Equipment (AREA)
  • Variable-Direction Aerials And Aerial Arrays (AREA)
  • Filters And Equalizers (AREA)
  • Support Of Aerials (AREA)
  • Transceivers (AREA)
EP96105722A 1995-04-12 1996-04-11 Antennenvorrichtung Withdrawn EP0738023A3 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP7087134A JPH08288739A (ja) 1995-04-12 1995-04-12 アンテナ装置
JP87134/95 1995-04-12

Publications (2)

Publication Number Publication Date
EP0738023A2 true EP0738023A2 (de) 1996-10-16
EP0738023A3 EP0738023A3 (de) 1997-05-21

Family

ID=13906502

Family Applications (1)

Application Number Title Priority Date Filing Date
EP96105722A Withdrawn EP0738023A3 (de) 1995-04-12 1996-04-11 Antennenvorrichtung

Country Status (2)

Country Link
EP (1) EP0738023A3 (de)
JP (1) JPH08288739A (de)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0829923A1 (de) * 1996-09-16 1998-03-18 Alcatel Espace Vorrichtung mit Strahlerelementen
EP0997973A1 (de) * 1998-10-22 2000-05-03 Murata Manufacturing Co., Ltd. Dielektrische Antenne mit Filter, dielektrische Antenne mit Duplexer and Funkgerät mit diesen Antennen
EP1158604A2 (de) * 2000-05-26 2001-11-28 Matsushita Electric Industrial Co., Ltd. Antenne, Antennenanordnung und Funkgerät
US6384793B2 (en) 1999-12-16 2002-05-07 Allgon Ab Slot antenna device

Families Citing this family (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2000049651A (ja) * 1998-07-27 2000-02-18 Hitachi Metals Ltd マルチバンド用高周波スイッチモジュール
JP2000307452A (ja) 1999-02-16 2000-11-02 Murata Mfg Co Ltd 高周波複合部品及びそれを用いた携帯無線機
KR100860281B1 (ko) 2000-08-04 2008-09-25 미츠비시 마테리알 가부시키가이샤 안테나
JP4628611B2 (ja) 2000-10-27 2011-02-09 三菱マテリアル株式会社 アンテナ
JP3774136B2 (ja) 2000-10-31 2006-05-10 三菱マテリアル株式会社 アンテナ及びそれを用いた電波送受信装置
JP2002204118A (ja) 2000-10-31 2002-07-19 Mitsubishi Materials Corp アンテナ
JP3868775B2 (ja) 2001-02-23 2007-01-17 宇部興産株式会社 アンテナ装置及びそれを用いた通信装置
JP4013839B2 (ja) * 2003-06-17 2007-11-28 ミツミ電機株式会社 アンテナ装置

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0621653A2 (de) * 1993-04-23 1994-10-26 Murata Manufacturing Co., Ltd. Oberflächenmontierbare Antenneneinheit
EP0707354A1 (de) * 1994-10-11 1996-04-17 Murata Manufacturing Co., Ltd. Antenne

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0621653A2 (de) * 1993-04-23 1994-10-26 Murata Manufacturing Co., Ltd. Oberflächenmontierbare Antenneneinheit
EP0707354A1 (de) * 1994-10-11 1996-04-17 Murata Manufacturing Co., Ltd. Antenne

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0829923A1 (de) * 1996-09-16 1998-03-18 Alcatel Espace Vorrichtung mit Strahlerelementen
FR2753569A1 (fr) * 1996-09-16 1998-03-20 Alcatel Espace Dispositif a elements rayonnants
US5982328A (en) * 1996-09-16 1999-11-09 Alcatel Espace Device with radiating elements
EP0997973A1 (de) * 1998-10-22 2000-05-03 Murata Manufacturing Co., Ltd. Dielektrische Antenne mit Filter, dielektrische Antenne mit Duplexer and Funkgerät mit diesen Antennen
US6313797B1 (en) 1998-10-22 2001-11-06 Murata Manufacturing Co., Ltd. Dielectric antenna including filter, dielectric antenna including duplexer, and radio apparatus
US6384793B2 (en) 1999-12-16 2002-05-07 Allgon Ab Slot antenna device
EP1158604A2 (de) * 2000-05-26 2001-11-28 Matsushita Electric Industrial Co., Ltd. Antenne, Antennenanordnung und Funkgerät
EP1158604A3 (de) * 2000-05-26 2004-05-19 Matsushita Electric Industrial Co., Ltd. Antenne, Antennenanordnung und Funkgerät
US6906677B2 (en) 2000-05-26 2005-06-14 Matsushita Electric Industrial Co., Ltd. Antenna, antenna device, and radio equipment
CN1312948C (zh) * 2000-05-26 2007-04-25 松下电器产业株式会社 天线、天线设备以及无线电设备

Also Published As

Publication number Publication date
EP0738023A3 (de) 1997-05-21
JPH08288739A (ja) 1996-11-01

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