EP2037532A1 - Flat dual-band antenna - Google Patents

Flat dual-band antenna Download PDF

Info

Publication number
EP2037532A1
EP2037532A1 EP08163276A EP08163276A EP2037532A1 EP 2037532 A1 EP2037532 A1 EP 2037532A1 EP 08163276 A EP08163276 A EP 08163276A EP 08163276 A EP08163276 A EP 08163276A EP 2037532 A1 EP2037532 A1 EP 2037532A1
Authority
EP
European Patent Office
Prior art keywords
unit
grounding
band antenna
radiating
antenna according
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Withdrawn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
EP08163276A
Other languages
German (de)
English (en)
French (fr)
Inventor
Ming-Yen Liu
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.)
Asustek Computer Inc
Original Assignee
Asustek Computer Inc
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 Asustek Computer Inc filed Critical Asustek Computer Inc
Publication of EP2037532A1 publication Critical patent/EP2037532A1/en
Withdrawn legal-status Critical Current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
    • H01Q9/30—Resonant antennas with feed to end of elongated active element, e.g. unipole
    • H01Q9/42—Resonant antennas with feed to end of elongated active element, e.g. unipole with folded element, the folded parts being spaced apart a small fraction of the operating wavelength
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q21/00—Antenna arrays or systems
    • H01Q21/30—Combinations of separate antenna units operating in different wavebands and connected to a common feeder system
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q5/00—Arrangements for simultaneous operation of antennas on two or more different wavebands, e.g. dual-band or multi-band arrangements
    • H01Q5/30—Arrangements for providing operation on different wavebands
    • H01Q5/307—Individual or coupled radiating elements, each element being fed in an unspecified way
    • H01Q5/342—Individual or coupled radiating elements, each element being fed in an unspecified way for different propagation modes
    • H01Q5/357—Individual or coupled radiating elements, each element being fed in an unspecified way for different propagation modes using a single feed point
    • H01Q5/364—Creating multiple current paths
    • H01Q5/371—Branching current paths

Definitions

  • the invention relates to a dual-band antenna and, in particular, to a flat dual-band antenna.
  • Wireless transmission technology is widely used in electronic products. Most present electronic products have the wireless transmission function so as to satisfy customers' requirements.
  • the antenna is an important element for transmitting and receiving electromagnetic waves in the wireless transmission systems. Without the antenna, the wireless transmission system cannot transmit and receive data. Thus, the antenna plays an indispensable role in the wireless transmission system.
  • an appropriate antenna can make the product appearance more attractive, enhance the transmission quality and reduce the product cost.
  • Different methods and different materials for manufacturing the antennas are used in different products.
  • the antennas are designed in consideration of different frequency bands used in different countries.
  • a flat single-band antenna 1 includes a radiating unit 11, a grounding unit 12 and a feeding unit 13.
  • the flat single-band antenna 1 is disposed on a circuit board 14.
  • the grounding unit 12 is protruded from one end of the radiating unit 11, and the feeding unit 13 is protruded from one point of the radiating unit 11.
  • the grounding unit 12 and the feeding unit 13 are disposed at the same side of the radiating unit 11.
  • the grounding unit 12 is grounded, and the feeding unit 13 is for feeding signals.
  • the flat single-band antenna 1 can operate in a frequency band, which is, for example, compliant with IEEE 802.11b/g (2.4 GHz) or IEEE 802.11a (5GHz), according to the radiating unit 11.
  • the flat single-band antenna 1 is not enough for the present multi-band applications.
  • An object of the invention is to provide a flat dual-band antenna that can operate in dual frequency bands.
  • the invention discloses a flat dual-band antenna, which includes a radiating unit, a grounding unit and a feeding unit.
  • the grounding unit has a gradual width-changing section. One end of the grounding unit is connected with the radiating unit, and the other end of the grounding unit is grounded.
  • the radiating unit is divided into a first radiating portion and a second radiating portion by the grounding unit.
  • the feeding unit is connected with the junction of the first radiating portion and the second radiating portion, and electrically connected with the radiating unit and the grounding unit.
  • the flat dual-band antenna of the invention modifies the relative location of the feeding unit and the configuration of the grounding unit, so that the first radiating portion and the grounding unit can operate in a first frequency band and the second radiating portion and the grounding unit can operate in a second frequency band.
  • the impedance can be adjusted by the gradual width-changing section of the invention so as to increase the operating frequency bandwidth. Therefore, the flat dual-band antenna of the invention can operate in dual frequency bands and have larger bandwidth, thereby enhancing the transmission efficiency.
  • FIG. 1 is a schematic view of a conventional flat single-band antenna
  • FIG. 2 is a schematic view of a flat dual-band antenna according to a preferred embodiment of the invention.
  • FIG. 3 is a schematic view of another flat dual-band antenna according to the preferred embodiment of the invention.
  • FIG. 4 is a schematic diagram showing the Return Loss of the flat dual-band antenna according to the preferred embodiment of the invention.
  • FIGS. 5A to 5C are schematic diagrams showing the radiation fields of X-Y plane, X-Z plane and Y-Z plane, respectively, when the flat dual-band antenna according to the preferred embodiment of the invention operates at 2.4 GHz;
  • FIGS. 6A to 6C are schematic diagrams showing the radiation fields of X-Y plane, X-Z plane and Y-Z plane, respectively, when the flat dual-band antenna according to the preferred embodiment of the invention operates at 5.8 GHz.
  • a flat dual-band antenna 2 includes a radiating unit 21, a grounding unit 22 and a feeding unit 23.
  • the radiating unit 21, the grounding unit 22 and the feeding unit 23 are integrally formed in the embodiment.
  • the radiating unit 21 may have at least one bending portion 211.
  • the bending portion 211 can efficiently reduce the occupied area of the radiating unit 21 so as to contribute the miniaturization of the antenna. If there is no configuration of the bending portion 211, the radiating unit 21 can be strip-shaped. Alternatively, the radiating unit 21 can be L-shaped with the bending portion 211. Of course, the shape of the radiating unit 21 is not limited and can be any other shapes.
  • grounding unit 22 One end of the grounding unit 22 is connected with the radiating unit 21, and the other end of the grounding unit 22 is connected with a grounding surface 24 and grounded.
  • an angle is formed between the grounding unit 22 and the radiating unit 21, and the angle can be an acute or obtuse angle.
  • the grounding unit 22 may have at least one bending portion. In the embodiment, the grounding unit 22 has two bending portions 221 and 222.
  • the grounding unit 22 has a gradual width-changing section 223. According to the gradual width-changing section 223, the width of the grounding unit 22 can be gradually increased or decreased for adjusting the impedance, thereby increasing the operating bandwidth.
  • the gradual width-changing section 223 of the embodiment is disposed adjacent to the radiating unit 21 and is gradually decreased.
  • the radiating unit 21 is divided into a first radiating portion 212 and a second radiating portion 213 by the grounding unit 22.
  • the feeding unit 23 is connected with the junction of the first radiating 212 and the second radiating portion 213, and electrically connected with the radiating unit 21 and the grounding unit 22.
  • the feeding unit 23 and the grounding unit 22 are disposed at the same side of the radiating unit 21.
  • the combination of the radiating unit 21 and the feeding unit 23 is T-shaped.
  • the junction of the feeding unit 23 and the radiating unit 21 is disposed adjacent to the junction of the grounding unit 22 and the radiating unit 21.
  • the flat dual-band antenna 2 of the embodiment can operate in dual frequency bands by adjusting the relative locations of the feeding unit 23 and the grounding 22.
  • the flat dual-band antenna 2 further includes a substrate 25.
  • the radiating unit 21, the grounding unit 22, the feeding unit 23 and the grounding surface 24 are disposed on the substrate 25.
  • the substrate 25 can be a printed circuit board (PCB).
  • the flat dual-band antenna 2 further includes a conductive unit 26, such as a coaxial transmission cable.
  • the conductive unit 26 has a conductive body 261 and a grounding body 262.
  • the conductive body 261 is electrically connected with the feeding unit 23, and the grounding body 262 is grounded.
  • the grounding body 262 is connected with the grounding surface 24 and grounded.
  • the conductive unit 26 further includes a first insulating layer 263 and a second insulating layer 264.
  • the first insulating layer 263 is disposed between the conductive body 261 and the grounding body 262 to insulate electrical signals between the conductive body 261 and the grounding body 262.
  • the second insulating layer 264 is the surface layer of the conductive unit 26 for providing insulation and protection functions.
  • the traces on the substrate 25 can also alternatively provide the signal feeding function.
  • the first radiating portion 212 and the grounding unit 22 operate in a first frequency band
  • the second radiating portion 213 and the grounding unit 22 operate in a second frequency band.
  • the first frequency band for example, is compliant with IEEE 802.11b/g with an operating bandwidth between 2.4 GHz and 2.5 GHz.
  • the second frequency band for example, is compliant with IEEE 802.11a with an operating bandwidth between 5.2 GHz and 5.8 GHz.
  • the operating frequency band of the antenna is related to its dimension, and the dimension can be adjusted according to the operating frequency band of the antenna.
  • the dimension of the antenna could be adjusted by the rule as follows.
  • the resonance length of the antenna can be a quarter (for dipole antenna) or a half wavelength (for patch antenna) of the operating frequency band.
  • the operating frequency band of the antenna is correspondingly changed.
  • the vertical axis shows the value of the Return Loss (dB), and the horizontal axis shows the value of the frequency.
  • the dual-band antenna 2 of the preferred embodiment can operate in a bandwidth between 2.4 GHz and 2.5 GHz and another bandwidth between 5.2 GHz and 5.8 GHz.
  • FIG. 5A to 5C and FIG. 6A to 6C show the radiation fields of the flat dual-bad antenna 2 when it operates at 2.4GHz and 5.8 GHz, respectively.
  • FIG. 5A to 5C and FIG. 6A to 6C show the radiation fields of the flat dual-bad antenna 2 when it operates at 2.4GHz and 5.8 GHz, respectively.
  • FIG. 5A to 5C show the radiation fields of X-Y plane, X-Z plane and Y-Z plane, respectively, when the flat dual-band antenna 2 operates at 2.4 GHz.
  • FIG. 6A to 6C show the radiation fields of X-Y plane, X-Z plane and Y-Z plane, respectively, when the flat dual-band antenna 2 operates at 5.8 GHz.
  • the flat dual-band antenna of the invention modifies the relative locations of the feeding unit and the grounding unit, so that the first radiating portion and the grounding unit can operate in a first frequency band and the second radiating portion and the grounding unit can operate in a second frequency band.
  • the impedance can be adjusted by the gradual width-changing section of the invention so as to increase the operating frequency bandwidth. Therefore, the flat dual-band antenna of the invention can operate in dual frequency bands and have larger bandwidth, thereby enhancing the transmission efficiency.

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  • Waveguide Aerials (AREA)
  • Details Of Aerials (AREA)
  • Variable-Direction Aerials And Aerial Arrays (AREA)
EP08163276A 2007-09-14 2008-08-29 Flat dual-band antenna Withdrawn EP2037532A1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CNA2007101494742A CN101388488A (zh) 2007-09-14 2007-09-14 平面双频天线

Publications (1)

Publication Number Publication Date
EP2037532A1 true EP2037532A1 (en) 2009-03-18

Family

ID=39884462

Family Applications (1)

Application Number Title Priority Date Filing Date
EP08163276A Withdrawn EP2037532A1 (en) 2007-09-14 2008-08-29 Flat dual-band antenna

Country Status (2)

Country Link
EP (1) EP2037532A1 (zh)
CN (1) CN101388488A (zh)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2065972B1 (en) * 2007-11-21 2011-02-16 Arcadyan Technology Corp. Dual-band-antenna
EP2958191A1 (en) * 2014-06-16 2015-12-23 Arcadyan Technology Corporation Dual-band three-dimensional antenna
EP3065216A1 (en) * 2015-03-05 2016-09-07 Arcadyan Technology Corporation Monopole antenna
CN106033836A (zh) * 2015-03-13 2016-10-19 智易科技股份有限公司 单极天线

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10147921A1 (de) * 2001-09-28 2003-04-17 Siemens Ag Planare Inverted-F-Antenne
US20040066334A1 (en) * 2002-10-08 2004-04-08 Wistron Neweb Corporation Multifrequency inverted-F antenna
WO2004112189A1 (en) * 2003-06-17 2004-12-23 Perlos Ab A multiband antenna for a portable terminal apparatus
US20070103367A1 (en) * 2005-11-09 2007-05-10 Chih-Ming Wang Slot and multi-inverted-F coupling wideband antenna and electronic device thereof

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10147921A1 (de) * 2001-09-28 2003-04-17 Siemens Ag Planare Inverted-F-Antenne
US20040066334A1 (en) * 2002-10-08 2004-04-08 Wistron Neweb Corporation Multifrequency inverted-F antenna
WO2004112189A1 (en) * 2003-06-17 2004-12-23 Perlos Ab A multiband antenna for a portable terminal apparatus
US20070103367A1 (en) * 2005-11-09 2007-05-10 Chih-Ming Wang Slot and multi-inverted-F coupling wideband antenna and electronic device thereof

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2065972B1 (en) * 2007-11-21 2011-02-16 Arcadyan Technology Corp. Dual-band-antenna
EP2958191A1 (en) * 2014-06-16 2015-12-23 Arcadyan Technology Corporation Dual-band three-dimensional antenna
EP3065216A1 (en) * 2015-03-05 2016-09-07 Arcadyan Technology Corporation Monopole antenna
CN106033836A (zh) * 2015-03-13 2016-10-19 智易科技股份有限公司 单极天线

Also Published As

Publication number Publication date
CN101388488A (zh) 2009-03-18

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