EP3217476A1 - Antennenvorrichtung - Google Patents

Antennenvorrichtung Download PDF

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Publication number
EP3217476A1
EP3217476A1 EP17159993.9A EP17159993A EP3217476A1 EP 3217476 A1 EP3217476 A1 EP 3217476A1 EP 17159993 A EP17159993 A EP 17159993A EP 3217476 A1 EP3217476 A1 EP 3217476A1
Authority
EP
European Patent Office
Prior art keywords
radiation
antenna device
shorting
radiation element
ground plane
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.)
Granted
Application number
EP17159993.9A
Other languages
English (en)
French (fr)
Other versions
EP3217476B1 (de
Inventor
Pei-Ju Lee
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.)
Sercomm Corp
Original Assignee
Sercomm Corp
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Filing date
Publication date
Application filed by Sercomm Corp filed Critical Sercomm Corp
Publication of EP3217476A1 publication Critical patent/EP3217476A1/de
Application granted granted Critical
Publication of EP3217476B1 publication Critical patent/EP3217476B1/de
Active legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • 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
    • 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
    • H01Q9/0407—Substantially flat resonant element parallel to ground plane, e.g. patch antenna
    • H01Q9/0421—Substantially flat resonant element parallel to ground plane, e.g. patch antenna with a shorting wall or a shorting pin at one end of the element
    • 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
    • H01Q9/32—Vertical arrangement of element
    • H01Q9/36—Vertical arrangement of element with top loading

Definitions

  • the invention is related to an antenna device, and particularly to an antenna device having wideband operation and omnidirectional radiation pattern.
  • ceiling-type network equipment such as access point (AP) is normally installed at a high point (e.g. ceiling) in a space so as to provide broader signal coverage.
  • AP access point
  • an antenna device in the ceiling-type network equipment must have omnidirectional radiation pattern.
  • the conventional antenna device does not satisfy the need for both of wideband operation and omnidirectional radiation pattern, and thus limits the development of the ceiling-type network equipment in practical application.
  • the invention is defined in the independent claim.
  • the dependent claims define preferred embodiments.
  • the invention provides an antenna device which has good dual wideband operation and omnidirectional radiation pattern, thereby effectively increasing signal coverage of ceiling-type network equipment.
  • An antenna device includes a first shorting element, a second shorting element, a first radiation element, a second radiation element and a third radiation element.
  • the first shorting element and the second shorting element are electrically connected to a ground plane.
  • the first radiation element has a feeding point and is disposed between the first shorting element and the second shorting element.
  • the second radiation element is electrically connected between the first radiation element and the first shorting element.
  • the third radiation element is electrically connected between the first radiation element and the second shorting element.
  • the first radiation element to the third radiation element, the first shorting element and the second shorting element form two antenna elements disposed in parallel, such that the antenna device operates in a first frequency band and a second frequency band.
  • the antenna device uses the first radiation element to the third radiation element, the first shorting element and the second shorting element to form two antenna elements that are arranged in parallel according to the embodiments of the invention.
  • the antenna device can have good dual wideband operation and omnidirectional radiation pattern, and can further be adapted for use in the ceiling-type network equipment while effectively increasing signal coverage of the ceiling-type network equipment.
  • FIGs. 1 and 2 are schematic views illustrating an antenna device according to an embodiment of the invention.
  • an antenna device 100 includes a first radiation element 110, a second radiation element 120, a third radiation element 130, a first shorting element 140 and a second shorting element 150.
  • Each of the first to third radiation elements 110-130, the first shorting element 140 and the second shorting element 150 may be, for example, a rectangular metal sheet.
  • the antenna device 100 further includes a fixing element 160.
  • the antenna device 100 may be tightly attached to a ground plane 101 through the fixing element 160.
  • the fixing element 160 may be regarded as a part of the ground plane 101.
  • persons skilled in the art may remove the fixing element 160 based on the need of design, and the first shorting element 140 and the second shorting element 150 in the antenna device 100 may be directly and electrically connected to the ground plane 101.
  • the first radiation element 110 has a feeding point FP1, and the first radiation element 110 is disposed between the first shorting element 140 and the second shorting element 150.
  • the first radiation element 110 includes a first sidewall SD11 and a second sidewall SD12 opposite to each other, and the first sidewall SD11 faces the ground plane 101.
  • the second sidewall SD12 is electrically connected to the second radiation element 120 and the third radiation element 130.
  • the feeding point FP1 is disposed in the center of the first sidewall SD11.
  • the first radiation element 110 is perpendicular to the ground plane 101, and may be divided into a first portion 111 and a second portion 112.
  • the first portion 111 and second portion 112 may be two different elements tightly attached to each other to form the first radiation element 110.
  • the first portion 111 and second portion 112 may be formed integrally, for example.
  • the second radiation element 120 is electrically connected between the first radiation element 110 and the first shorting element 140.
  • the third radiation element 130 is electrically connected between the first radiation element 110 and the second shorting element 150.
  • the second radiation element 120 and the third radiation element 130 are disposed symmetrically relative to the first radiation element 110.
  • the geometric plane where the first radiation element 110 is located is used as a basis; the second radiation element 120 and third radiation element 130 are disposed symmetrically on two opposite sides of the first radiation element 110.
  • the second radiation element 120 is parallel to the ground plane 101 and electrically connected to the first portion 111 of the first radiation element 110.
  • the third radiation element 130 is parallel to the ground plane 101 and electrically connected to the second portion 112 of the first radiation element 110.
  • the first to third radiation elements 110-130 can form a T-shaped structure.
  • the first shorting element 140 is electrically connected to a sidewall SD21 of the second radiation element 120
  • the second shorting element 150 is electrically connected to a sidewall SD31 of the third radiation element 130.
  • the first shorting element 140 extends from the sidewall SD21 of the second radiation element 120 to the ground plane 101 in a direction perpendicular to the second radiation element 120.
  • the second shorting element 150 extends from the sidewall SD31 of the third radiation element 130 to the ground plane 101 in a direction perpendicular to the third radiation element 130.
  • the first shorting element 140 and the second shorting element 150 are perpendicular to the ground plane 101.
  • the first portion 111 (or the first radiation element 110 as a whole), the second radiation element 120 and the first shorting element 140 may form a first inverted-F antenna.
  • the second portion 112 (or the first radiation element 110 as a whole), the third radiation element 130 and the second shorting element 150 may form a second inverted-F antenna.
  • the first inverted-F antenna and the second inverted-F antenna are connected in parallel.
  • the first to third radiation elements 110-130, the first shorting element 140 and the second shorting element 150 can form two antenna elements arranged in parallel, and the two antenna elements are respectively an inverted-F antenna.
  • the antenna device 100 can operate in a first frequency band and a second frequency band and have the characteristic of dual wideband operation.
  • a distance D11 from the feeding point FP1 to both ends of the first sidewall SD11 may be 1/4 wavelength of the first frequency band.
  • the length of the first radiation element 110 i.e., the length of the first sidewall SD11
  • the antenna device 100 can operate in the first frequency band mainly through the first radiation element 110.
  • a plurality of current paths formed by the first radiation element 110 can further effectively expand the bandwidth of the first frequency band.
  • FIG. 3 is a diagram illustrating return loss (S11) of an antenna device in a first frequency band according to an embodiment of the invention.
  • the first frequency band of the antenna device 100 is a 5 GHz band, for example; the return loss of the antenna device 100 between 4.5 GHz ⁇ 6.5 GHz can be less than -11 dB.
  • FIG. 4 is a diagram illustrating return loss of an antenna device in a second frequency band according to an embodiment of the invention.
  • the second frequency band of the antenna device 100 is a 2.4 GHz band, for example; the return loss of the antenna device 100 between 2.17 GHz ⁇ 3 GHz can be less than -10 dB.
  • FIG. 5 is a schematic view illustrating configuration of an antenna device relative to a ground plane according to an embodiment of the invention.
  • the antenna device 100 may be disposed in the center of the ground plane 101.
  • the radiation pattern of the antenna device 100 is shown as illustrated in FIG. 6 .
  • ⁇ is the angle between the radiation direction and the Z-axis.
  • the solid line and dashed lines in FIG. 6 respectively represent main polarization gain and cross-polarization gain of the antenna device 100.
  • the antenna device 100 has omnidirectional radiation pattern at 2.45 GHz and 5.5 GHz.
  • the antenna device 100 has good dual wideband operation and omnidirectional radiation pattern. Therefore, in practical application, the antenna device 100 is adapted for ceiling-type network equipment, and can effectively increase signal coverage of the ceiling-type network equipment. Other than that, the antenna device 100 is coupled to the ground plane 101 through the shorting element 140 and shorting element 150; that is, the antenna device 100 has a dual grounding structure. As such, the current of the first to third radiation elements 110-130 can be distributed more uniformly so that the radiation pattern of the antenna device 100 can be more stable and not easily affected by external environment.
  • FIG. 7 is a schematic view illustrating configuration of an antenna device relative to a ground plane according to another embodiment of the invention.
  • the antenna device 100 may be adjacent to an edge 710 of the ground plane 101.
  • a distance D7 between the antenna device 100 and the edge 710 can be 10 mm.
  • the radiation pattern of the antenna device 100 in the first frequency band i.e., high frequency band
  • the effect caused by the ground plane 101 to the antenna device 100 may be reduced by slightly adjusting the lengths of the second radiation element 120 and the third radiation element 130 as well as the configuration positions of the shorting 140 and the shorting 150.
  • FIG. 8 is a schematic view illustrating an antenna device according to another embodiment of the invention.
  • the lengths of the second radiation element 120 and the third radiation element 130 may be adjusted to a length D82, and the length D82 is smaller than the length D12 as shown in FIG. 1 .
  • the effect caused by the ground plane 101 to the antenna device 100 can be reduced by decreasing the lengths of the second radiation element 120 and the third radiation element 130 as well as shifting the position of the shorting element 140 and shorting element 150 along a direction away from the edge 710.
  • FIG. 8 is a schematic view illustrating an antenna device according to another embodiment of the invention.
  • the lengths of the second radiation element 120 and the third radiation element 130 may be adjusted to a length D82, and the length D82 is smaller than the length D12 as shown in FIG. 1 .
  • the effect caused by the ground plane 101 to the antenna device 100 can be reduced by decreasing the lengths of the second radiation element 120 and the third radiation element 130 as well as shifting the position of the shorting element 140 and shorting element 150 along
  • FIG. 9 is a diagram describing the radiation pattern of the antenna device illustrated in the embodiment of FIG. 8 .
  • ⁇ is the angle between the radiation direction and the Z-axis.
  • the solid line and dashed line in FIG. 9 respectively represent the main polarization gain and cross-polarization gain of the antenna device 100.
  • the antenna device 100 can still have good omnidirectional radiation pattern at 2.45 GHz and 5.5 GHz.
  • the antenna device in the invention uses the first to third radiation elements, the first shorting element and the second shorting element to form two antenna elements arranged in parallel.
  • the antenna device can have good dual wideband operation and omnidirectional radiation pattern, and can further be adapted for use in the ceiling-type network equipment while effectively increasing the signal coverage of the ceiling-type network equipment.
  • the antenna device has a dual grounding structure so that the radiation pattern of the antenna device can be more stable and is not easily affected by external environment.

Landscapes

  • Waveguide Aerials (AREA)
  • Variable-Direction Aerials And Aerial Arrays (AREA)
EP17159993.9A 2016-03-11 2017-03-09 Antennenvorrichtung Active EP3217476B1 (de)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201620188459.3U CN205429167U (zh) 2016-03-11 2016-03-11 天线装置

Publications (2)

Publication Number Publication Date
EP3217476A1 true EP3217476A1 (de) 2017-09-13
EP3217476B1 EP3217476B1 (de) 2019-08-07

Family

ID=56534562

Family Applications (1)

Application Number Title Priority Date Filing Date
EP17159993.9A Active EP3217476B1 (de) 2016-03-11 2017-03-09 Antennenvorrichtung

Country Status (3)

Country Link
EP (1) EP3217476B1 (de)
CN (1) CN205429167U (de)
TW (1) TWM533331U (de)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113193356B (zh) * 2021-04-25 2023-07-25 Oppo广东移动通信有限公司 天线装置、电子标签设备及通信系统

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2002047200A1 (en) * 2000-12-08 2002-06-13 Avantego Ab Antenna arrangement
EP1246299A2 (de) * 2001-03-26 2002-10-02 Matsushita Electric Industrial Co., Ltd. M-förmige Antenne
US20070171132A1 (en) * 2006-01-23 2007-07-26 Yokowo Co., Ltd. Planar antenna
US20140347243A1 (en) * 2013-05-22 2014-11-27 Wisconsin Alumni Research Foundation Electrically-small, low-profile, ultra-wideband antenna

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2002047200A1 (en) * 2000-12-08 2002-06-13 Avantego Ab Antenna arrangement
EP1246299A2 (de) * 2001-03-26 2002-10-02 Matsushita Electric Industrial Co., Ltd. M-förmige Antenne
US20070171132A1 (en) * 2006-01-23 2007-07-26 Yokowo Co., Ltd. Planar antenna
US20140347243A1 (en) * 2013-05-22 2014-11-27 Wisconsin Alumni Research Foundation Electrically-small, low-profile, ultra-wideband antenna

Also Published As

Publication number Publication date
CN205429167U (zh) 2016-08-03
EP3217476B1 (de) 2019-08-07
TWM533331U (en) 2016-12-01

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