EP2063486A1 - Antennenvorrichtung - Google Patents

Antennenvorrichtung Download PDF

Info

Publication number
EP2063486A1
EP2063486A1 EP08019387A EP08019387A EP2063486A1 EP 2063486 A1 EP2063486 A1 EP 2063486A1 EP 08019387 A EP08019387 A EP 08019387A EP 08019387 A EP08019387 A EP 08019387A EP 2063486 A1 EP2063486 A1 EP 2063486A1
Authority
EP
European Patent Office
Prior art keywords
antenna
matching circuit
ground
transmission line
antenna apparatus
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Withdrawn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
EP08019387A
Other languages
English (en)
French (fr)
Inventor
Yukio Otaki
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.)
Alps Alpine Co Ltd
Original Assignee
Alps Electric 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 Alps Electric Co Ltd filed Critical Alps Electric Co Ltd
Publication of EP2063486A1 publication Critical patent/EP2063486A1/de
Withdrawn legal-status Critical Current

Links

Images

Classifications

    • 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
    • H01Q1/2283—Supports; Mounting means by structural association with other equipment or articles mounted in or on the surface of a semiconductor substrate as a chip-type antenna or integrated with other components into an IC package
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q1/00—Details of, or arrangements associated with, antennas
    • H01Q1/36—Structural form of radiating elements, e.g. cone, spiral, umbrella; Particular materials used therewith
    • H01Q1/362—Structural form of radiating elements, e.g. cone, spiral, umbrella; Particular materials used therewith for broadside radiating helical antennas
    • 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 apparatus used in a cellular phone and the like to receive a television signal.
  • antenna apparatuses for a television device built in a mobile device have been developed. Since a broadcast band for television broadcast signals is a wide band (for example, 470 MHz to 770 MHz in Japan), a wideband antenna apparatus is needed to correspond to the wide band when one antenna is intended to be used. For example, in an antenna apparatus disclosed in Japanese Unexamined Patent Application Publication No.
  • a DC block capacitor is connected to a feeding section of a radiation conductor, a resonant circuit is formed by connecting a variable capacitance diode between one end of the radiation conductor and the DC block capacitor, and a connecting point between the variable capacitance diode and the DC block capacitor is connected to an antenna earth via a high frequency choke coil.
  • the antenna apparatus is tuned to a used frequency by superimposing a frequency control voltage of the voltage control oscillator on a voltage of the feeding section.
  • Fig. 4 is an exterior diagram illustrating an antenna apparatus having a tunable matching circuit tuning to the used frequency and functioning as a matching circuit.
  • Fig. 5 is a diagram illustrating a configuration of an antenna module of the antenna apparatus shown in Fig. 4 .
  • the antenna apparatus includes an antenna element (helical antenna) 3 formed by winding a radiation conductor 2 in a helical shape around an outer periphery of a base substance 1 made of resin and a tunable matching circuit 4 capable of controlling a used frequency band with a signal from a tuner.
  • a ground surface GND for providing a ground potential of the tunable matching circuit 4 is formed just below the antenna element 3.
  • the tunable matching circuit 4 includes a resonant circuit formed of varactor diodes 11 and 12 and inductors 13, 14, and 15 as shown in Fig. 5 .
  • An anode of one side varactor diode 11 connected to the antenna element 3 is connected via a resistor 16 to a ground GND formed just below the antenna.
  • an anode of the other side varactor diode 12 and one end of an inductor 15 is connected to the ground GND formed just below the antenna via an inductor 17.
  • one end of a bypass line L for applying a tuning signal Vt is connected to cathodes of the varactor diodes 11 and 12, and the other end of the bypass line L is connected to a transmission line.
  • a tuner side end of the inductor 15 is connected to a tuner via a DC cut capacitor 18.
  • capacitances of the varactor diodes 11 and 12 are changed by a tuning signal Vt applied from the tuner to the cathodes of the varactor diodes 11 and 12, and an antenna side tuning frequency is controlled.
  • a tuning frequency signal is acquired from a wideband high-frequency reception signal output from the antenna element 3, and is transmitted to the tuner.
  • the ground GND is formed just below the antenna.
  • the ground GND becomes a factor of lowering a gain and a radiation efficiency of the antenna, thereby deteriorating antenna performance.
  • the antenna apparatus includes: an antenna element having a radiation conductor formed on a surface of a base substance; and a matching circuit formed on the base substance to match with the radiation conductor and having a variable capacitor to which a control voltage for controlling capacitance is applied from a reception circuit formed outside the base substance.
  • a ground potential of the matching circuit is applied via a transmission line for transmitting an RF signal output from the matching circuit to the reception circuit.
  • the ground potential of the matching circuit is applied via the transmission line for transmitting the RF signal output from the matching circuit to the reception circuit, it is possible to remove a ground surface for applying a ground potential to the matching circuit of the antenna from just below the antenna. Thus, it is possible to prevent the antenna element from being affected by a ground line.
  • an inductor be connected in series between the transmission line and a ground of the reception circuit on the reception circuit side.
  • the inductor is connected in series between the transmission line and the ground of the reception circuit, it is possible to provide a DC ground and a high frequency ground on the reception circuit side to the matching circuit.
  • the voltage applied to the variable capacitor of the matching circuit be supplied via a line separate from the transmission line.
  • the matching circuit have two variable capacitors connected to each other in series and have a resistor or an inductor between the transmission line and a radiation-conductor side end of the variable capacitor close to the radiation conductor.
  • Fig. 1 is a diagram illustrating a configuration of a circuit from an antenna module to a tuner in a receiver according to an embodiment of the invention.
  • Fig. 2 is a diagram illustrating the overall configuration of the receiver.
  • the receiver of the embodiment is configured to perform frequency conversion by inputting an RF signal output from an antenna module 20 to a tuner 21, and to perform demodulation by inputting an IF signal obtained by the frequency conversion to a demodulating IC 22.
  • the receiver is also configured to allow a processor 23 formed by combination of a CPU, a MPEG decoder, and the like to restore video data and sound data and output the data to a monitor and a speaker not shown in the drawing. From the demodulating IC 22, a tuning signal Vt for determining a tuning frequency in accordance with program selection is transmitted to the antenna module 20.
  • the antenna module 20 includes an antenna element 31 and a tunable matching circuit 32.
  • the tuning signal Vt DC bias
  • the RF signal is output from a second terminal 34 to the tuner 21.
  • the antenna element 31 is formed as a helical antenna having a shape in which a radiation conductor 2 is helically wound around an outer periphery of a base substance 1 made of resin.
  • a ground for obtaining a ground potential of the tunable matching circuit 32 is removed from just below the antenna element 31.
  • the base substance 1 is made of resin, but the invention is not limited to this, and the base substance may be made of a dielectric substance, a magnetic substance, or combined materials of them.
  • the base substance may be formed of a film.
  • the radiation conductor has a helical structure, but the invention is not limited to this, and the radiation conductor may be formed in a monopole shape or a loop shape.
  • one end of the inductor 35 is connected to an output terminal of the antenna element 31, and the other end of the inductor 35 is connected to an anode of one side varactor diode 36.
  • a cathode of the one side varactor diode 36 is connected in series to a cathode of the other side varactor diode 38 via an inductor 37.
  • An anode of the other side varactor diode 38 is connected to one end of an inductor 39, and the other end of the inductor 39 is connected to the second terminal 34.
  • one end of a grounding resistor 41 having high impedance with respect to high frequency is connected to the one end of the inductor 35.
  • an inductor having high impedance with respect to a high frequency instead of the grounding resistor 41 may be used.
  • the other end of the grounding resistor 41 is connected to the second terminal 34 via a ground line (or pattern) 42.
  • the second terminal 34 is connected to an input terminal of the tuner 21 via a transmission line 43 formed on a set substrate having the antenna apparatus attached thereto. Between the second terminal 34 and the tuner 21, a DC cut capacitor 44 is provided.
  • the transmission line 43 is connected to a ground 46 on the set substrate side via an inductor 45. Specifically, a ground potential serving as a reference electric potential of the one side varactor diode 36 is applied from the ground 46 on the set substrate side via the ground line 42 on the antenna apparatus side and the transmission line 43 on the set substrate side. In addition, a ground potential of the other side varactor diode 38 is applied via the transmission line 43 on the set substrate side.
  • a cathode side connecting point between one side varactor diode 36 and the other side varactor diode 38 is connected to the first terminal 33 via a bias resistor 47.
  • the first terminal 33 is connected to a variable DC output circuit 48 set on the set substrate side.
  • the variable DC output circuit 48 generates a DC voltage having a magnitude based on a channel select signal given from the demodulating IC 22, and outputs the DC voltage as a tuning signal Vt.
  • the variable DC output circuit 48 may be configured to control the DC bias voltage in a PWM mode.
  • the variable DC output circuit 48 may be configured to have a DA converter on a reception circuit side and generate a required DC bias voltage on the basis of digital data input to the DA converter.
  • a path for applying the tuning signal Vt to a connecting point between the varactor diodes 36 and 38 on the cathode side and a path for connecting the anode of the varactor diodes 36 and 38 to the ground 46 and transmitting an RF signal to the tuner 21 are separately formed.
  • the anode of the one side varactor diode 36 is connected to the set-substrate side ground 46 via the grounding resistor 41, the ground line 42, the transmission line 43, and the inductor 45. Furthermore, the anode of the other side varactor diode 38 is connected to the set-substrate side ground 46 via the transmission line 43 and the inductor 45. Accordingly, the set-substrate side ground 46 applies a DC ground potential to the anodes of the varactor diodes 36 and 38 of the tunable matching circuit 32, and applies a high-frequency ground potential to a tuner side end of the inductor 39 via the inductor 45.
  • a DC bias instruction value based on channel selection is given to the variable DC output circuit 48.
  • the variable DC output circuit 48 generates a DC bias corresponding to the DC bias instruction value and applies the DC bias as a tuning voltage Vt to the first terminal 33.
  • the tuning voltage Vt applied to the first terminal 33 is applied to the cathodes of the varactor diodes 36 and 38 via a voltage applying line separate from the transmission line 43.
  • Fig. 3 is a diagram illustrating relationship between a frequency and a VSWR (Voltage Standing Wave Ratio) when the tuning voltage Vt is varied. As shown in the drawing, the most effective frequency for transferring high frequency energy is varied depending on the tuning voltage Vt.
  • VSWR Voltage Standing Wave Ratio
  • the tunable matching circuit 32 extracts a frequency component corresponding to a band of the selected channel from the RF signal output from the antenna element 31, and outputs the component from the second terminal 34.
  • the RF signal of the selected channel band extracted in the tunable matching circuit 32 is input to the tuner 21 via the transmission line 43.
  • the RF signal is converted into an IF signal by frequency conversion in the tuner 21, and is demodulated by the demodulating IC 22.
  • video data and sound data is restored from the demodulated signal, and is output to a monitor and a speaker not shown in the drawing.
  • the tunable matching circuit 32 is configured to acquire a ground potential from the set substrate side to which the antenna module 20 is attached, and the voltage applying line of the tuning signal Vt which is a DC bias is formed separately from the transmission line 43 for inputting the RF signal to the tuner side.
  • the embodiments of the invention can be applied to antenna apparatuses built in small wireless mechanisms such as a cellular phone to receive television signals.

Landscapes

  • Engineering & Computer Science (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Input Circuits Of Receivers And Coupling Of Receivers And Audio Equipment (AREA)
  • Details Of Aerials (AREA)
  • Variable-Direction Aerials And Aerial Arrays (AREA)
EP08019387A 2007-11-08 2008-11-05 Antennenvorrichtung Withdrawn EP2063486A1 (de)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2007290363A JP2009118292A (ja) 2007-11-08 2007-11-08 アンテナ装置

Publications (1)

Publication Number Publication Date
EP2063486A1 true EP2063486A1 (de) 2009-05-27

Family

ID=40497438

Family Applications (1)

Application Number Title Priority Date Filing Date
EP08019387A Withdrawn EP2063486A1 (de) 2007-11-08 2008-11-05 Antennenvorrichtung

Country Status (2)

Country Link
EP (1) EP2063486A1 (de)
JP (1) JP2009118292A (de)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8413094B2 (en) * 2010-10-05 2013-04-02 International Business Machines Corporation Structure, design structure and process for increasing magnitude of device threshold voltage for low power applications

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH06314982A (ja) 1993-04-30 1994-11-08 Kenwood Corp アンテナ
JPH10209897A (ja) * 1997-01-20 1998-08-07 Harada Ind Co Ltd 可変同調型アンテナ装置
EP1231674A2 (de) * 2001-02-07 2002-08-14 Matsushita Electric Industrial Co., Ltd. Antenne
EP1471597A1 (de) * 2003-04-22 2004-10-27 Alps Electric Co., Ltd. Karte mit eingebauter Antenne
EP1617564A1 (de) * 2003-04-18 2006-01-18 Yokowo Co., Ltd Antenne mit variabler abstimmung und mobile drahtlose einrichtung damit
JP2007290363A (ja) 2006-03-27 2007-11-08 Seiko Epson Corp 液体カートリッジ

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH06314982A (ja) 1993-04-30 1994-11-08 Kenwood Corp アンテナ
JPH10209897A (ja) * 1997-01-20 1998-08-07 Harada Ind Co Ltd 可変同調型アンテナ装置
EP1231674A2 (de) * 2001-02-07 2002-08-14 Matsushita Electric Industrial Co., Ltd. Antenne
EP1617564A1 (de) * 2003-04-18 2006-01-18 Yokowo Co., Ltd Antenne mit variabler abstimmung und mobile drahtlose einrichtung damit
EP1471597A1 (de) * 2003-04-22 2004-10-27 Alps Electric Co., Ltd. Karte mit eingebauter Antenne
JP2007290363A (ja) 2006-03-27 2007-11-08 Seiko Epson Corp 液体カートリッジ

Also Published As

Publication number Publication date
JP2009118292A (ja) 2009-05-28

Similar Documents

Publication Publication Date Title
US11469740B2 (en) Adaptive self-tunable antenna system and method
US6606069B2 (en) Antenna device
US7557773B2 (en) Variable tuning antenna and mobile wireless device using same
KR101122851B1 (ko) 방송 수신 단말 장치
JP4959956B2 (ja) アンテナ
EP1983605A1 (de) Antennenvorrichtung
EP2128924A1 (de) Antennenvorrichtung
EP2139065A1 (de) Antennenvorrichtung
JP2008259039A (ja) アンテナ装置
TWI322617B (en) A tv tuner and the manufacturing method thereof
JP3829805B2 (ja) 平面アンテナ
JP2009044561A (ja) アンテナ整合回路
US20060139227A1 (en) Antenna device having enhanced reception sensitivity in wide bands
JP5003628B2 (ja) チューナブルアンテナ、及びチューナブルアンテナを備えた受信装置
JP2009118292A (ja) アンテナ装置
EP1788662A1 (de) Breitband-Empfangs-Antennenvorrichtung
US7345651B2 (en) Antenna
EP1641072B1 (de) Antenne mit variabler Richtcharakteristik
Kim et al. Tunable internal loop antenna for DVB-H service
JP2009253685A (ja) 同調型アンテナモジュール及び無線装置
JP2012034379A (ja) 無線ユニットおよび無線装置
JP2009272981A (ja) 受信機およびそれを備えた携帯端末装置
JP2012186585A (ja) テレビジョンチューナ
JPH07303031A (ja) 電子チューナ

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

AK Designated contracting states

Kind code of ref document: A1

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

AX Request for extension of the european patent

Extension state: AL BA MK RS

17P Request for examination filed

Effective date: 20090715

AKX Designation fees paid

Designated state(s): DE FR GB IT

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

Free format text: STATUS: THE APPLICATION HAS BEEN WITHDRAWN

18W Application withdrawn

Effective date: 20140128