EP1826874A1 - Antenne mit verbesserter Empfangsempfindlichkeit im Breitband - Google Patents
Antenne mit verbesserter Empfangsempfindlichkeit im Breitband Download PDFInfo
- 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- Withdrawn
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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)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP06003972A EP1826874A1 (de) | 2006-02-27 | 2006-02-27 | Antenne mit verbesserter Empfangsempfindlichkeit im Breitband |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP06003972A EP1826874A1 (de) | 2006-02-27 | 2006-02-27 | Antenne mit verbesserter Empfangsempfindlichkeit im Breitband |
Publications (1)
Publication Number | Publication Date |
---|---|
EP1826874A1 true EP1826874A1 (de) | 2007-08-29 |
Family
ID=36087743
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP06003972A Withdrawn EP1826874A1 (de) | 2006-02-27 | 2006-02-27 | Antenne mit verbesserter Empfangsempfindlichkeit im Breitband |
Country Status (1)
Country | Link |
---|---|
EP (1) | EP1826874A1 (de) |
Citations (7)
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 (en) * | 1997-07-09 | 1999-01-21 | Allgon Ab | Antenna device for a hand-portable radio communication unit |
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 (de) * | 2004-01-26 | 2005-07-27 | Alps Electric Co., Ltd. | Breitbandige abstimmbare Antenne |
-
2006
- 2006-02-27 EP EP06003972A patent/EP1826874A1/de not_active Withdrawn
Patent Citations (7)
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 (en) * | 1997-07-09 | 1999-01-21 | Allgon Ab | Antenna device for a hand-portable radio communication unit |
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 (de) * | 2004-01-26 | 2005-07-27 | Alps Electric Co., Ltd. | Breitbandige abstimmbare Antenne |
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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 |