EP1826874A1 - Antenne ayant une sensibilité de réception améliorée dans les bandes larges - Google Patents

Antenne ayant une sensibilité de réception améliorée dans les bandes larges Download PDF

Info

Publication number
EP1826874A1
EP1826874A1 EP06003972A EP06003972A EP1826874A1 EP 1826874 A1 EP1826874 A1 EP 1826874A1 EP 06003972 A EP06003972 A EP 06003972A EP 06003972 A EP06003972 A EP 06003972A EP 1826874 A1 EP1826874 A1 EP 1826874A1
Authority
EP
European Patent Office
Prior art keywords
radiation conductor
variable capacitance
radiation
antenna device
divided
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Withdrawn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
EP06003972A
Other languages
German (de)
English (en)
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 EP06003972A priority Critical patent/EP1826874A1/fr
Publication of EP1826874A1 publication Critical patent/EP1826874A1/fr
Withdrawn legal-status Critical Current

Links

Images

Classifications

    • 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
    • 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

Definitions

  • the present invention relates to an antenna device that can be tuned to wide band 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 spiral conductor 12 form connection terminals 16 and 18.
  • the spiral 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 spiral 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 prism-shaped or plate-shaped base member made of a dielectric or magnetic material, band-shaped first and second radiation conductors wound around the base member and connected to each other, and a band-shaped third radiation conductor wound around the base member and connected to the second radiation conductor.
  • the first and second radiation conductors are respectively formed by a plurality of divided first radiation conductor portions and a plurality of divided second radiation portions, and the divided first radiation conductor portions are connected in series by first variable capacitance elements.
  • the divided second radiation conductor portions are connected in series by second variable capacitance elements, and a node between the first and second radiation conductors is used as a feeding end.
  • the first radiation conductor resonates with a high range of the UHF band within a variable capacitance range of the first variable capacitance elements
  • a series radiation conductor comprising the second and third radiation conductors resonates with a low range of the UHF band within a variable capacitance range of the second variable capacitance elements.
  • variable capacitance elements may include varactor diodes, and a tuning voltage may be applied to each varactor diode through each radiation conductor.
  • an antenna device includes a prism-shaped or plate-shaped base member made of a dielectric or magnetic material, band-shaped first and second radiation conductors wound around the base member and connected to each other, and a band-shaped third radiation conductor wound around the base member and connected to the second radiation conductor.
  • the first and second radiation conductors are respectively formed by a plurality of divided first radiation conductor portions and a plurality of divided second radiation conductor portions are connected in series by first variable capacitance elements.
  • the divided second radiation conductor portions are connected in series by second variable capacitance elements, and a node between the first and second radiation conductors is used as a feeding end.
  • the first radiation conductor resonates with a high range of the UHF band within a variable capacitance range of the first variable capacitance elements
  • a series radiation conductor comprising the second and third radiation conductors resonates with a low range of the UHF band within a variable capacitance range of the second variable capacitance elements.
  • Television signals in two ranges of the UHF band can be received.
  • variable capacitance elements may include varactor diodes, and a tuning voltage may be applied to each varactor diode through each radiation conductor.
  • a tuning voltage may be applied to each varactor diode through each radiation conductor.
  • Fig. 1 is a perspective view of the antenna device 1
  • Fig. 2 is an equivalent circuit of the antenna device 1.
  • Fig. 3 shows a voltage distribution in the antenna device 1.
  • band-shaped first and second radiation conductors 22 and 23 are wound around a base member 21 having, for example, a prism or plate shape, and which is formed of a dielectric or magnetic material, and are connected to each other.
  • a third radiation conductor 24 is connected to the second radiation conductor 23, and is also wound around the base member 21.
  • the first radiation conductor 22 is formed by a plurality of divided portions. Among divided first radiation conductor portions 22a, 22b, 22c, and 22d, two adjacent conductor portions are connected to each other by each of first variable capacitance elements (varactor diodes) 25 (25a to 25c).
  • the second radiation conductor 23 is also formed by a plurality of divided portions. Among divided second radiation conductor portions 23a, 23b, and 23c, two adjacent conductors are connected to each other by each of second variable capacitance elements (varactor diodes) 26 (26a to 26c). The third radiation conductor 24 is connected to the second radiation conductor 23c by the variable capacitance element 26c.
  • the first variable capacitance element 25 and the second variable capacitance element 26 are provided on an upper surface of the base member 21.
  • the first radiation conductor portion 22d and the second radiation conductor portion 23a are connected to each other by a connection conductor 27 formed on the upper surface of the base member 21.
  • a connection conductor 27 formed on the upper surface of the base member 21.
  • a ground conductor 28 and a feeding conductor 29 are formed in the vicinity of the connection conductor 27, a ground conductor 28 and a feeding conductor 29 are formed.
  • the ground conductor 28 and the feeding conductor 29 extend to side surfaces of the base member 21.
  • the connection conductor 27 is connected to the ground conductor 28 by an impedance-matching capacitor 30 and is connected to the feeding conductor 29 by a coupling capacitor 31.
  • 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 broadcasting, and is mounted on a motherboard (not shown) of the portable device.
  • the feeding conductor 29 is connected to a tuner circuit (RF) formed on the motherboard.
  • a tuning voltage Vt is supplied from the motherboard to the first radiation conductor portion 22b, and the second radiation conductor portions 23a and 23c through resistors.
  • the first radiation conductor portions 22a and 22c, the second radiation conductor portion 23b, and the third radiation conductor 24 are grounded for DC on the motherboard by resistors. This applies the tuning voltage Vt between two ends of the first variable capacitance elements 25 and between two ends of the second variable capacitance elements 26.
  • connection conductor 27 serves as a feeding end P
  • an end of the first radiation conductor portion 22a serves as a first open end Q1
  • an end of the third radiation conductor 24 serves as a second open end Q2.
  • An electrical length of the first radiation conductor 22 is set so that a resonance occurs with a high range (for example, 620 MHz to 770 MHz) of the UHF band within a variable capacitance range of each first variable capacitance element 25.
  • An electrical length of the entirety of the second radiation conductor 23 and the third radiation conductor 24 is set so that a resonance occurs with a low range (for example, 470 MHz to 620 MHz) of the UHF band within a variable capacitance range of the first variable capacitance element 26.
  • Fig. 3 shows voltage distributions between the positions of the feeding end P and the first open end Q1, and voltage distributions between the positions of the feeding end P and the second open end Q2.
  • the positions of the first open end Q1 and the second open end Q2 always have maximum voltages, and the positions of minimum voltages change correspondingly to resonant frequencies.
  • Part A of Fig. 3 shows a voltage distribution in the case of a resonance with 470 MHz in the low band, and the position of the minimum voltage is the position of the feeding end P.
  • a minimum voltage point P1 is moved to the position of the second open end Q2.
  • Establishing a resonance with 620 MHz moves a minimum voltage point P2 to the position of the second open end Q2, as shown in part C of Fig. 3.
  • This position P2 serves as a node between the second radiation conductor 23 and the third radiation conductor 24.
  • the minimum voltage point is the position of the feeding end P.
  • establishing a resonance with 695 MHz moves the position P3 of the minimum voltage point to the first open end Q1
  • establishing a resonance with 770 MHz moves the position P4 of the minimum voltage point to the first open end Q1.

Landscapes

  • Variable-Direction Aerials And Aerial Arrays (AREA)
EP06003972A 2006-02-27 2006-02-27 Antenne ayant une sensibilité de réception améliorée dans les bandes larges Withdrawn EP1826874A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP06003972A EP1826874A1 (fr) 2006-02-27 2006-02-27 Antenne ayant une sensibilité de réception améliorée dans les bandes larges

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP06003972A EP1826874A1 (fr) 2006-02-27 2006-02-27 Antenne ayant une sensibilité de réception améliorée dans les bandes larges

Publications (1)

Publication Number Publication Date
EP1826874A1 true EP1826874A1 (fr) 2007-08-29

Family

ID=36087743

Family Applications (1)

Application Number Title Priority Date Filing Date
EP06003972A Withdrawn EP1826874A1 (fr) 2006-02-27 2006-02-27 Antenne ayant une sensibilité de réception améliorée dans les bandes larges

Country Status (1)

Country Link
EP (1) EP1826874A1 (fr)

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3427624A (en) * 1966-07-13 1969-02-11 Northrop Corp Low profile antenna having horizontal tunable top loading member
US3573840A (en) * 1967-12-15 1971-04-06 Onera (Off Nat Aerospatiale) Small bulk helically wound antennae and method for making same
WO1999003166A1 (fr) * 1997-07-09 1999-01-21 Allgon Ab Dispositif antenne destine a une unite de radiocommunication portable
US6198442B1 (en) * 1999-07-22 2001-03-06 Ericsson Inc. Multiple frequency band branch antennas for wireless communicators
US20020190906A1 (en) * 2001-06-15 2002-12-19 Korea Institute Of Science And Technology Ceramic chip antenna
US20040119647A1 (en) * 2002-11-29 2004-06-24 Tdk Corporation Chip antenna, chip antenna unit and wireless communication device using the same
EP1557902A1 (fr) * 2004-01-26 2005-07-27 Alps Electric Co., Ltd. Antenne accordable à large bande

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3427624A (en) * 1966-07-13 1969-02-11 Northrop Corp Low profile antenna having horizontal tunable top loading member
US3573840A (en) * 1967-12-15 1971-04-06 Onera (Off Nat Aerospatiale) Small bulk helically wound antennae and method for making same
WO1999003166A1 (fr) * 1997-07-09 1999-01-21 Allgon Ab Dispositif antenne destine a une unite de radiocommunication portable
US6198442B1 (en) * 1999-07-22 2001-03-06 Ericsson Inc. Multiple frequency band branch antennas for wireless communicators
US20020190906A1 (en) * 2001-06-15 2002-12-19 Korea Institute Of Science And Technology Ceramic chip antenna
US20040119647A1 (en) * 2002-11-29 2004-06-24 Tdk Corporation Chip antenna, chip antenna unit and wireless communication device using the same
EP1557902A1 (fr) * 2004-01-26 2005-07-27 Alps Electric Co., Ltd. Antenne accordable à large bande

Similar Documents

Publication Publication Date Title
KR101122851B1 (ko) 방송 수신 단말 장치
US6950065B2 (en) Mobile communication device
US7557773B2 (en) Variable tuning antenna and mobile wireless device using same
US9190733B2 (en) Antenna with multiple coupled regions
US6933893B2 (en) Electronically tunable planar antenna and method of tuning the same
US7675469B2 (en) Tunable antenna device and radio apparatus
EP2154752B1 (fr) Antenne plafond toutes ondes
US7071887B2 (en) Antenna device capable of being tuned in wide band
US7129894B1 (en) Selectable length meander line antenna
WO2008051057A1 (fr) Antenne à boucle
EP1983605A1 (fr) Dispositif d'antenne
JP3243595B2 (ja) マルチバンドアンテナ及びそれを用いたマルチバンド携帯無線機
JP2006319477A (ja) 複合アンテナ
US7307598B2 (en) Antenna device having enhanced reception sensitivity in wide bands
US7315287B2 (en) Antenna device having enhanced reception sensitivity in wide bands
EP1885022A1 (fr) Telephone cellulaire avec recepteur de radiodiffusion
JP2006191270A (ja) アンテナ装置
US7304615B2 (en) Wideband receiving antenna device
US20080096604A1 (en) Mobile Telephone Device
GB2373637A (en) Multi frequency band antenna
US7786947B2 (en) Broadband antenna
EP1569298B1 (fr) Antenne de télévision pour un dispositif communicant portatif
EP1826874A1 (fr) Antenne ayant une sensibilité de réception améliorée dans les bandes larges
EP1826873A1 (fr) Antenne ayant une sensibilité de réception améliorée dans les bandes larges
JP2006140662A (ja) アンテナ装置

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: 20061009

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 HU IE IS IT LI LT LU LV MC NL PL PT RO SE SI SK TR

AX Request for extension of the european patent

Extension state: AL BA HR MK YU

AKX Designation fees paid

Designated state(s): DE ES FR GB IT

17Q First examination report despatched

Effective date: 20081001

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

Free format text: STATUS: THE APPLICATION IS DEEMED TO BE WITHDRAWN

18D Application deemed to be withdrawn

Effective date: 20080902