EP1826873A1 - Antenne mit verbesserter Empfangsempfindlichkeit im Breitband - Google Patents

Antenne mit verbesserter Empfangsempfindlichkeit im Breitband Download PDF

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Publication number
EP1826873A1
EP1826873A1 EP06003971A EP06003971A EP1826873A1 EP 1826873 A1 EP1826873 A1 EP 1826873A1 EP 06003971 A EP06003971 A EP 06003971A EP 06003971 A EP06003971 A EP 06003971A EP 1826873 A1 EP1826873 A1 EP 1826873A1
Authority
EP
European Patent Office
Prior art keywords
base member
radiation conductor
conductor
antenna device
disposed
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Withdrawn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
EP06003971A
Other languages
English (en)
French (fr)
Inventor
Makoto c/o Alps Electric Co. Ltd. Shigihara
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
Priority to EP06003971A priority Critical patent/EP1826873A1/de
Publication of EP1826873A1 publication Critical patent/EP1826873A1/de
Withdrawn legal-status Critical Current

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Classifications

    • 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
    • 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
    • H01Q3/00—Arrangements for changing or varying the orientation or the shape of the directional pattern of the waves radiated from an antenna or antenna system
    • H01Q3/24—Arrangements for changing or varying the orientation or the shape of the directional pattern of the waves radiated from an antenna or antenna system varying the orientation by switching energy from one active radiating element to another, e.g. for beam switching
    • H01Q3/247—Arrangements for changing or varying the orientation or the shape of the directional pattern of the waves radiated from an antenna or antenna system varying the orientation by switching energy from one active radiating element to another, e.g. for beam switching by switching different parts of a primary active element

Definitions

  • the present invention relates to an antenna device that can be tuned to wideband frequencies.
  • a known antenna device 10 is described with reference to Figs. 4 and 5.
  • a conductor 12 made of a fine metal wire is spirally wound around a ferrite magnetic core 14. Ends of the conductor 12 form connection terminals 16 and 18.
  • the conductor 12 includes a plurality of divided conductor portions 12', and the conductor portions 12' are connected to one another by a plurality of capacitance elements 20.
  • the antenna device 10 is such that the capacitance elements 20 are physically distributed in the conductor 12 to have a closed loop form.
  • the antenna device 10 responds to a particular frequency (see, for example, Japanese Unexamined Patent Application Publication No. 51-83755 (Figs. 1 and 3) and its corresponding United States Patent No. 3,946,397 ).
  • the known antenna device resonates with a particular frequency.
  • the known antenna device receives over wide bands, its reception sensitivity in frequencies other than the particular frequency decreases.
  • an antenna device which includes a rectangular parallelepiped base member made of a dielectric or magnetic material, a band-shaped first radiation conductor, including a plurality of divided first radiation conductor portions, spirally wound around the base member, a plurality of variable capacitance elements connected between pairs of adjacent portions among the divided first radiation conductor portions and disposed on an upper surface of the base member, and a feeding conductor for supplying a tuning voltage to the variable capacitance elements.
  • the first radiation conductor has first radiation conductor parts respectively formed on upper, lower, and rear side surfaces of the base member and first connecting through-holes passing through the upper and lower surfaces are provided in the base member, and the first radiation conductor part on the upper surface and the first radiation conductor part on the lower surface are connected to each another by the first through-holes, and the feeding conductor is disposed on a front surface of the base member.
  • variable capacitance elements include varactor diodes
  • the adjacent divided first radiation conductor portions are alternately connected between pairs of anodes of the varactor diodes and between pairs of cathodes of the varactor diodes
  • a ground conductor formed at least on the lower and front surfaces is provided at one end of the base member.
  • Second through-holes passing through the upper and lower surfaces may be provided and connected to the ground conductor on the lower surface, and may be connected to the divided first radiation conductor portions, which are connected between the varactor diodes on the upper surface through a first resistor.
  • the first radiation conductor portions, which are connected between the pairs of cathodes of the varactor diodes may be connected to the feeding conductor by a second resistor, and the first and second resistors may be disposed on the upper surface of the base member.
  • An antenna feeding conductor coupled with the first radiation conductor is disposed on the front surface.
  • the antenna device may further include a second radiation conductor wound around the base member.
  • the second radiation conductor may be connected to the first radiation conductor by switching elements, with the switching elements disposed on the upper surface of the base member, and a switching voltage feeding conductor for applying a switching voltage for controlling the switching elements to be opened and closed may be disposed on the front surface of the base member.
  • an antenna device includes a rectangular parallelepiped base member made of a dielectric or magnetic material, a band-shaped first radiation conductor, including a plurality of divided first radiation conductor portions, spirally wound around the base member, a plurality of variable capacitance elements connected between pairs of adjacent portions among the divided first radiation conductor portions and disposed on an upper surface of the base member, and a feeding conductor for supplying a tuning voltage to the variable capacitance elements.
  • the first radiation conductor has first radiation conductor parts respectively formed on upper, lower, and rear side surfaces of the base member and first connecting through-holes passing through the upper and lower surfaces are provided in the base member, and the first radiation conductor part on the upper surface and the first radiation conductor part on the lower surface are connected to each another by the first through-holes, and the feeding conductor is disposed on a front surface of the base member.
  • a bias feeding conductor for feeding a variable capacitance element tuning voltage can be disposed on a front surface of a base member, which is effective in reducing antenna device size.
  • variable capacitance elements include varactor diodes, the adjacent divided first radiation conductor portions are alternately connected between pairs of anodes of the varactor diodes and between pairs of cathodes of the varactor diodes, and a ground conductor formed at least on the lower and front surfaces is provided at one end of the base member.
  • Second through-holes passing through the upper and lower surfaces are provided and connected to the ground conductor on the lower surface, and are connected to the divided first radiation conductor portions, which are connected between the varactor diodes on the upper surface through a first resistor.
  • the first radiation conductor portions which are connected between the pairs of cathodes of the varactor diodes, are connected to the feeding conductor by a second resistor, and the first and second resistors are disposed on the upper surface of the base member.
  • antenna device size can further be reduced.
  • an antenna feeding conductor coupled with the first radiation conductor is disposed on the front surface.
  • establishing connection to a receiver circuit is facilitated.
  • an antenna device further includes a second radiation conductor wound around the base member.
  • the second radiation conductor is connected to the first radiation conductor by switching elements, with the switching elements disposed on the upper surface of the base member, and a switching voltage feeding conductor for applying a switching voltage for controlling the switching elements to be opened and closed is disposed on the front surface of the base member.
  • Fig. 1 is a perspective view
  • Fig. 2 is a lower view of the antenna device 1
  • Fig. 3 shows an equivalent circuit.
  • a band-shaped first radiation conductor 23 in which radiation conductor portions are formed is spirally wound is formed through a plurality of first through-holes (two-sided conduction holes) 22 (22a to 22h) penetrating the upper and lower surfaces of the base member 21.
  • the first radiation conductor 23 includes a plurality of divided radiation conductor portions 23a to 23e, and the divided radiation conductor portions 23a to 23e are connected in series by varactor diodes (variable capacitance elements) 24 (24a to 24d). As shown in Fig. 3, among the varactor diodes 24, pairs of adjacent varactor diodes each have opposing anodes and opposing cathodes.
  • the cathode of the leftmost varactor diode 24a is connected to the radiation conductor portion 23a, and the anode of the varactor diode 24a is connected to the radiation conductor portion 23b.
  • the anode of the following varactor diode 24b is connected to the radiation conductor portion 23b, and the cathode of the varactor diode 24b is connected to the radiation conductor portion 23c.
  • the cathode of the following varactor diode 24c is connected to the radiation conductor portion 23c, and the anode of the varactor diode 24c is connected to the radiation conductor portion 23d.
  • the anode of the following varactor diode 24d is connected to the radiation conductor portion 23d, and the cathode of the varactor diode 24d is connected to the radiation conductor portion 23e.
  • a ground conductor 25 is formed on four surfaces, that is, upper, lower, rear side, and front surfaces of the base member 21.
  • an impedance-matching capacitor 26 is disposed which connects, to the ground conductor 25, the radiation conductor portion 23a at a position closest to the ground conductor 25.
  • the radiation conductor portion 23a is coupled with an antenna feeding conductor 28 by a first coupling capacitor 27.
  • the antenna feeding conductor 28 extends from the upper surface to the front surface.
  • a first resistor 29a is connected to the radiation conductor portion 23a by the first through-hole 29a, and the first resistor 29a is connected to a bias feeding conductor 30.
  • the bias feeding conductor 30 extends from the upper surface to the front surface.
  • a second resistor 31a is connected to the following radiation conductor portion 23b by the first through-hole 22b, and the second resistor 31a is connected to a second through-hole 32a.
  • a first resistor 29b is connected to the following radiation conductor portion 23c by the first through-hole 22d, and the first resistor 29b is connected to the bias feeding conductor 30.
  • a second resistor 31b is connected to the following radiation conductor portion 23d by the first through-hole 22f, and the second resistor 31b is connected to the second through-hole 32b.
  • a first resistor 29c is connected to the following radiation conductor portion 23e by the first through-hole 22h, and the first resistor 29c is connected to the bias feeding conductor 30.
  • the first and second resistors 29 and 31 are also disposed on the upper surface of the base member 21.
  • each varactor diode 24 has an anode connected to the ground conductor 25 and a cathode connected to the bias feeding conductor 30.
  • An end of the last divided first radiation conductor portion 23e serves as a first open end, and is connected to a diode (switching element) 34 by a second coupling capacitor 33 disposed on the upper surface of the base member 21.
  • a node between the second coupling capacitor 33 and the diode 34 is connected to a switching voltage feeding conductor 36a by a third resistor 35a.
  • the second coupling capacitor 33 and the diode 34 are disposed on the upper surface of the base member 21, and the switching voltage feeding conductor 36a extends from the upper surface to the front surface.
  • a second radiation conductor 37 is connected to the diode 34.
  • the second radiation conductor 37 is also wound around the base member 21, and is partly wound through a third through-hole 38.
  • a third resistor 35b is connected to the second radiation conductor 37 through the third through-hole 38, and is connected to a switching voltage feeding conductor 36b.
  • the switching voltage feeding conductors 36a and 36b are arranged in parallel on the front surface.
  • the antenna device 1 having the above-described configuration is used in, for example, a portable device (e.g., a cellular phone) assumed to receive analog television broadcasting or digital terrestrial television broadcasting, and is mounted on a motherboard of the portable device.
  • the antenna feeding conductor 28 is connected to a tuner circuit (RF) formed on the motherboard.
  • RF tuner circuit
  • a tuning voltage Vt is supplied from the motherboard to the bias feeding conductor 30, and the ground conductor 25 is grounded on the motherboard. This applies the tuning voltage Vt between ends of the varactor diodes 24.
  • the switching voltage feeding conductors 36a and 36b are supplied with a switching voltage from the motherboard.
  • An electrical length of the first radiation conductors 23 is set to resonate with, for example, the UHF band (470 MHz to 770 MHz) within a variable capacitance range of the varactor diodes 24. Therefore, when the diode 34 is off (opened), the antenna device 1 can receive a television signal having an arbitrary frequency in the UHF band since an end of the radiation conductor portion 23e serves as an open end.
  • the first radiation conductor 23 is wound around the base member 21 through the first through-holes 22.
  • the bias feeding conductor 30 for feeding the tuning voltage to the varactor diode 24 can be disposed on the front surface, which is effective in reducing the size of the antenna device 1.

Landscapes

  • Engineering & Computer Science (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Variable-Direction Aerials And Aerial Arrays (AREA)
EP06003971A 2006-02-27 2006-02-27 Antenne mit verbesserter Empfangsempfindlichkeit im Breitband Withdrawn EP1826873A1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP06003971A EP1826873A1 (de) 2006-02-27 2006-02-27 Antenne mit verbesserter Empfangsempfindlichkeit im Breitband

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP06003971A EP1826873A1 (de) 2006-02-27 2006-02-27 Antenne mit verbesserter Empfangsempfindlichkeit im Breitband

Publications (1)

Publication Number Publication Date
EP1826873A1 true EP1826873A1 (de) 2007-08-29

Family

ID=36087763

Family Applications (1)

Application Number Title Priority Date Filing Date
EP06003971A Withdrawn EP1826873A1 (de) 2006-02-27 2006-02-27 Antenne mit verbesserter Empfangsempfindlichkeit im Breitband

Country Status (1)

Country Link
EP (1) EP1826873A1 (de)

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3946397A (en) 1974-12-16 1976-03-23 Motorola, Inc. Inductor or antenna arrangement with integral series resonating capacitors
EP0863571A2 (de) 1997-03-05 1998-09-09 Murata Manufacturing Co., Ltd. Mobiles Bildgerät und Antennenvorrichtung dafür
JP2003101322A (ja) * 2001-09-25 2003-04-04 Matsushita Electric Ind Co Ltd アンテナモジュールとこれを用いた携帯機器
EP1557902A1 (de) 2004-01-26 2005-07-27 Alps Electric Co., Ltd. Breitbandige abstimmbare Antenne
EP1580841A1 (de) 2002-12-26 2005-09-28 Sony Corporation Antenne zur drahtlosen kommunikation und vorrichtung zur drahtlosen kommunikation

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3946397A (en) 1974-12-16 1976-03-23 Motorola, Inc. Inductor or antenna arrangement with integral series resonating capacitors
JPS5183755A (de) 1974-12-16 1976-07-22 Motorola Inc
EP0863571A2 (de) 1997-03-05 1998-09-09 Murata Manufacturing Co., Ltd. Mobiles Bildgerät und Antennenvorrichtung dafür
JP2003101322A (ja) * 2001-09-25 2003-04-04 Matsushita Electric Ind Co Ltd アンテナモジュールとこれを用いた携帯機器
EP1580841A1 (de) 2002-12-26 2005-09-28 Sony Corporation Antenne zur drahtlosen kommunikation und vorrichtung zur drahtlosen kommunikation
EP1557902A1 (de) 2004-01-26 2005-07-27 Alps Electric Co., Ltd. Breitbandige abstimmbare Antenne

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN vol. 2003, no. 08 6 August 2003 (2003-08-06) *

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