WO2010090573A1 - Antenna - Google Patents

Antenna Download PDF

Info

Publication number
WO2010090573A1
WO2010090573A1 PCT/SE2010/000020 SE2010000020W WO2010090573A1 WO 2010090573 A1 WO2010090573 A1 WO 2010090573A1 SE 2010000020 W SE2010000020 W SE 2010000020W WO 2010090573 A1 WO2010090573 A1 WO 2010090573A1
Authority
WO
WIPO (PCT)
Prior art keywords
antenna
electrically conductive
conductive material
inner area
antenna element
Prior art date
Application number
PCT/SE2010/000020
Other languages
French (fr)
Inventor
Tomas Rutfors
Original Assignee
Proant Ab
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 Proant Ab filed Critical Proant Ab
Priority to EP10738804A priority Critical patent/EP2394331A1/en
Publication of WO2010090573A1 publication Critical patent/WO2010090573A1/en

Links

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
    • 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
    • H01Q1/38—Structural form of radiating elements, e.g. cone, spiral, umbrella; Particular materials used therewith formed by a conductive layer on an insulating support
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q1/00—Details of, or arrangements associated with, antennas
    • H01Q1/48—Earthing means; Earth screens; Counterpoises
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q1/00—Details of, or arrangements associated with, antennas
    • H01Q1/52—Means for reducing coupling between antennas; Means for reducing coupling between an antenna and another structure
    • 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
    • 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
    • H01Q5/378—Combination of fed elements with parasitic elements
    • 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
    • H01Q5/378—Combination of fed elements with parasitic elements
    • H01Q5/385—Two or more parasitic elements
    • 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
    • H01Q5/378—Combination of fed elements with parasitic elements
    • H01Q5/392—Combination of fed elements with parasitic elements the parasitic elements having dual-band or multi-band characteristics
    • 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
    • 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

Definitions

  • the present invention concerns an antenna including surrounding electrically conductive material and a slot.
  • an antenna is to convert wire bound signals to electromagnetic signals propagating in the ambient media.
  • the design of the antenna determines the properties of this conversion.
  • the requirements of a wireless communications system determine the requirements of the antenna and by that what type of antenna to be used.
  • antennas needs to be mounted on both metallic and none metallic objects. To eliminating the needs of selecting antenna depending of the backing is metallic or non metallic, it is desirable that the same antenna operate at both cases. It is also desirable that the antenna operates at several frequency bands. It is also important that the antenna isn't big, but its size shall be minimized having sufficient performance for the communication system.
  • antennas Since antennas shall be able to be placed both on metallic and non metallic material, it is common that the antenna contain an integrated ground plane. By that the antenna always will have metallic material in the vicinity making it operate at both cases.
  • Common antennas intended to be mounted on ground plane are F-antennas and planar F-antennas. These are denominated by the English names “inverted F antenna” and "planar inverted F antenna”. These antennas have a connection to the ground plane both to be smaller in size and to match the impedance to 50 ohms. To increase the band width and create extra resonance frequencies, passives conductors connected to ground at one spot can be added.
  • the passive conductor becomes a part of the antenna and can create an additional resonance at desired frequency.
  • the resonance frequencies created by passive elements is in general in proximity or higher than the antennas fundamental resonance.
  • the publicized patent applications US2006/0176226, US2007/0030200, US2008/0136711 and US2008/0180330 show different antennas including extra passive elements. These are used to create extra resonances to increase the band width of the antenna or create resonances at higher frequencies.
  • the present invention achieve two different and desirable properties, the antenna can be mounted in close vicinity and above a ground plane and an additional resonance can be created which can have significant lower resonance frequency than the antenna fundamental frequency.
  • the present invention includes an antenna having an inner area essentially surrounded by electrically conductive material having a slot into the inner area and at least one antenna element essentially located within the inner area.
  • the surrounding electrically conductive material and its slot together with the active antenna element and the electromagnetic coupling between them, creates a resonance at a lower or significant lower frequency than the active elements resonance frequency.
  • By adjusting length, width and location of the slot, of the surrounding electrically conductive material, its resonance frequency and impedance can be changed and adjusted. Another important and simple adjustment of the resonance frequency is made by changing the slit embodiment and spatial width. The spatial width of the slot can be decreased to lower the resonance frequency and vice verse. Also a longer slot gives a lower resonance frequency.
  • the radio signal connected to the antenna element by the coaxial cable can by advantage be connected to a connection point within the inner area. It is often necessary to adjust the impedance of the antenna element by create a connection between the antenna element and the surrounding electrically conductive material and in general this connection is galvanic.
  • the slot in the surrounding electrically conductive material can be located at any position but good properties often can be achieved having location remote of the antenna elements connection point of the radio signal. Therefore the slot usually is placed in vicinity of the end of the antenna element.
  • additional antenna elements which either can be connected to radio signal or ground can be placed within the antenna elements inner area. Additional resonance frequencies to increase the bandwidth, or create an efficient antenna for more frequency bands, can be created by adding additional antenna elements.
  • the antenna can be equipped with additional antenna elements placed outside the surrounded electrically conductive area. These antenna elements can have any shape and have a proper length fitting the antenna.
  • an antenna according to present invention mounts within a plastic box and to connect the radio signal by a coaxial cable.
  • the antenna can act as an external antenna to a variety of applications.
  • An antenna according to the invention is connected by radio signal to an antenna element and where the surrounding electrically conductive material is connected to the radio signals ground.
  • Figure 1 shows an antenna according to present invention having a simple embodiment.
  • Figure 2 shows an antenna according to present invention connected by coaxial cable and impedance match of the antenna element .
  • Figure 3 shows an antenna according to present invention having several antenna elements and another shape of the slot.
  • Figure 4 shows an antenna according to present invention where it is embodied for external mounting.
  • An antenna according present invention can be embodied according to figure 1.
  • the antenna element (10) is placed within an inner area (11) that is surrounded by an electrically conductive material (12) having a slot (13) into the inner area.
  • the radio signal is preferable connected at (14) and its ground at (15) .
  • Figure 2 shows another embodiment where a coaxial cable (16) is connected to the antenna elements connection point (14) and the surrounded electrical conductive material (15).
  • a connection (17) between the antenna element (10) and the surrounding electrical conductive material (12) is added to adjust the antenna impedance to, for example, 50 ohms.
  • Figure 3 shows another embodiment where an additional antenna element (18) and (19) is added to create additional resonance frequencies to increase the band width or create good antenna functionality at other frequency bands according to the requested antenna requirements.
  • the slot (13) is modified and can by changed embodiment such as slot length and width be adjusted to appropriate frequency / which usually is lower than the resonance frequency generated by the antenna element (10) .
  • the antenna embodiment according to figure 3 have also an antenna element (20) that is located outside the inner area. It is obvious that antennas don't need to have antenna element according to figure 3, but embodiment, placement and number of antenna elements can be changed within the present invention.
  • Figure 4 shows how an antenna based upon the present invention can be embodied.
  • Figure 4 shows an antenna element according to figure 1 to 3 with a vision from the side where the antenna element (22) with the surrounding electrical conductive material is located on a substrate (21) .
  • the antenna is placed into a cover (23) preferable of plastic or other electrical insulators and the connecting coaxial cable (24) is elapsed out of the antenna cover.
  • An antenna according to figure 4 can be mounted both on metallic and non metallic materials (25) having good antenna performance.
  • An antenna according to the present invention can with advantage be embodied at a laminate for printed circuit board, for example FR4 or other variants, by normal printed circuit board production process. This offers a very low cost antenna solution having good performance.
  • the antenna can also be embodied on flexible substrate and also direct out of sheet metal by punching or etching processing.
  • An antenna according to the present invention can be operational at many different frequency bands, for example 434 MHz, GSM900 (880 - 960 MHz), GSM1800 (1710 - 1880 MHz) and UMTS (1920 - 1980, 2110 - 2170 MHz) .
  • the antenna element (10) can operate at GSM900, antenna element (18) and (19) at GSM1800 and UMTS, and the surrounding electrical conductive material (12) with the slit (13) and its coupling to the antenna element (10) can create an efficient antenna for 434 MHz.
  • the surrounding material and its slit creates an antenna having a resonance frequency significant lower that the frequency of the active element (10) .
  • the antenna element (20) can also create additional resonance and/or improve the impedance match to, for example, 50 ohms. It is easily realized that different combinations of frequency band can be reached by the present invention.
  • the surrounding electrical conductive material (12) can have shape, length and width proportions differing from the figures 1 to 3.

Abstract

Present invention consists of an antenna with at least one antenna element out of electrically conductive material essentially located within an inner area surrounded of electrically conductive material that has a slot into the inner area.

Description

Technical field
The present invention concerns an antenna including surrounding electrically conductive material and a slot.
State o£ the art and background of the invention
The purpose of an antenna is to convert wire bound signals to electromagnetic signals propagating in the ambient media. The design of the antenna determines the properties of this conversion. The requirements of a wireless communications system determine the requirements of the antenna and by that what type of antenna to be used.
It is common that antennas needs to be mounted on both metallic and none metallic objects. To eliminating the needs of selecting antenna depending of the backing is metallic or non metallic, it is desirable that the same antenna operate at both cases. It is also desirable that the antenna operates at several frequency bands. It is also important that the antenna isn't big, but its size shall be minimized having sufficient performance for the communication system.
Since antennas shall be able to be placed both on metallic and non metallic material, it is common that the antenna contain an integrated ground plane. By that the antenna always will have metallic material in the vicinity making it operate at both cases. Common antennas intended to be mounted on ground plane are F-antennas and planar F-antennas. These are denominated by the English names "inverted F antenna" and "planar inverted F antenna". These antennas have a connection to the ground plane both to be smaller in size and to match the impedance to 50 ohms. To increase the band width and create extra resonance frequencies, passives conductors connected to ground at one spot can be added. By placing them close to the antenna the energy will put through and the passive conductor becomes a part of the antenna and can create an additional resonance at desired frequency. The resonance frequencies created by passive elements is in general in proximity or higher than the antennas fundamental resonance. The publicized patent applications US2006/0176226, US2007/0030200, US2008/0136711 and US2008/0180330 show different antennas including extra passive elements. These are used to create extra resonances to increase the band width of the antenna or create resonances at higher frequencies. The present invention achieve two different and desirable properties, the antenna can be mounted in close vicinity and above a ground plane and an additional resonance can be created which can have significant lower resonance frequency than the antenna fundamental frequency.
Description of the invention
The present invention includes an antenna having an inner area essentially surrounded by electrically conductive material having a slot into the inner area and at least one antenna element essentially located within the inner area. By this embodiment of the antenna the surrounding electrically conductive material and its slot together with the active antenna element and the electromagnetic coupling between them, creates a resonance at a lower or significant lower frequency than the active elements resonance frequency. By adjusting length, width and location of the slot, of the surrounding electrically conductive material, its resonance frequency and impedance can be changed and adjusted. Another important and simple adjustment of the resonance frequency is made by changing the slit embodiment and spatial width. The spatial width of the slot can be decreased to lower the resonance frequency and vice verse. Also a longer slot gives a lower resonance frequency. The radio signal connected to the antenna element by the coaxial cable can by advantage be connected to a connection point within the inner area. It is often necessary to adjust the impedance of the antenna element by create a connection between the antenna element and the surrounding electrically conductive material and in general this connection is galvanic. The slot in the surrounding electrically conductive material can be located at any position but good properties often can be achieved having location remote of the antenna elements connection point of the radio signal. Therefore the slot usually is placed in vicinity of the end of the antenna element. Also additional antenna elements which either can be connected to radio signal or ground can be placed within the antenna elements inner area. Additional resonance frequencies to increase the bandwidth, or create an efficient antenna for more frequency bands, can be created by adding additional antenna elements.
To further improve the antenna functionality, the antenna can be equipped with additional antenna elements placed outside the surrounded electrically conductive area. These antenna elements can have any shape and have a proper length fitting the antenna.
It is of advantage to mount an antenna according to present invention within a plastic box and to connect the radio signal by a coaxial cable. By that the antenna can act as an external antenna to a variety of applications. An antenna according to the invention is connected by radio signal to an antenna element and where the surrounding electrically conductive material is connected to the radio signals ground. Description of drawings
Figure 1: shows an antenna according to present invention having a simple embodiment.
Figure 2: shows an antenna according to present invention connected by coaxial cable and impedance match of the antenna element .
Figure 3: shows an antenna according to present invention having several antenna elements and another shape of the slot.
Figure 4: shows an antenna according to present invention where it is embodied for external mounting.
Preferred embodiments
An antenna according present invention can be embodied according to figure 1. The antenna element (10) is placed within an inner area (11) that is surrounded by an electrically conductive material (12) having a slot (13) into the inner area. The radio signal is preferable connected at (14) and its ground at (15) . Figure 2 shows another embodiment where a coaxial cable (16) is connected to the antenna elements connection point (14) and the surrounded electrical conductive material (15). A connection (17) between the antenna element (10) and the surrounding electrical conductive material (12) is added to adjust the antenna impedance to, for example, 50 ohms.
Figure 3 shows another embodiment where an additional antenna element (18) and (19) is added to create additional resonance frequencies to increase the band width or create good antenna functionality at other frequency bands according to the requested antenna requirements. The slot (13) is modified and can by changed embodiment such as slot length and width be adjusted to appropriate frequency/ which usually is lower than the resonance frequency generated by the antenna element (10) . The antenna embodiment according to figure 3 have also an antenna element (20) that is located outside the inner area. It is obvious that antennas don't need to have antenna element according to figure 3, but embodiment, placement and number of antenna elements can be changed within the present invention.
Figure 4 shows how an antenna based upon the present invention can be embodied. Figure 4 shows an antenna element according to figure 1 to 3 with a vision from the side where the antenna element (22) with the surrounding electrical conductive material is located on a substrate (21) . The antenna is placed into a cover (23) preferable of plastic or other electrical insulators and the connecting coaxial cable (24) is elapsed out of the antenna cover. An antenna according to figure 4 can be mounted both on metallic and non metallic materials (25) having good antenna performance.
An antenna according to the present invention can with advantage be embodied at a laminate for printed circuit board, for example FR4 or other variants, by normal printed circuit board production process. This offers a very low cost antenna solution having good performance. The antenna can also be embodied on flexible substrate and also direct out of sheet metal by punching or etching processing.
An antenna according to the present invention can be operational at many different frequency bands, for example 434 MHz, GSM900 (880 - 960 MHz), GSM1800 (1710 - 1880 MHz) and UMTS (1920 - 1980, 2110 - 2170 MHz) . Applied onto figure 3 the antenna element (10) can operate at GSM900, antenna element (18) and (19) at GSM1800 and UMTS, and the surrounding electrical conductive material (12) with the slit (13) and its coupling to the antenna element (10) can create an efficient antenna for 434 MHz. In this case the surrounding material and its slit creates an antenna having a resonance frequency significant lower that the frequency of the active element (10) . The antenna element (20) can also create additional resonance and/or improve the impedance match to, for example, 50 ohms. It is easily realized that different combinations of frequency band can be reached by the present invention. The surrounding electrical conductive material (12) can have shape, length and width proportions differing from the figures 1 to 3.

Claims

Claims
1) Antenna having at least one antenna element (10) of electrically conductive material, essential located within an inner area (11), and a essentially surrounding electrically conductive material (12) having a slot (13) in the surrounded electrical material (12) into the inner area (11) , where the antenna is characterized in that the antenna element (10) in the inner area is arranged to be an active antenna element.
2) Antenna according to claim 1, characterized in that the connection point to the antenna element is located within the inner area.
3) Antenna according to claims 1 or 2 characterised in that the antenna element have an connection to the surrounding electrically conductive material.
4) Antenna according to claims 1 - 3 characterized in that the slot into the inner area is located remote from the antenna elements connection point to radio transmitter and/or receiver.
5) Antenna according to claims 1 - 4 characterized in that the antenna includes additional electrically conductive antenna elements within the inner area.
6) Antenna according to claims 1 - 5 characterized in that the antenna have electrically conductive material extending or is placed in a trace out of the electrically conductive material surrounding the inner area.
7) Antenna according to claims 1 - 6 characterized in that it is located inside a plastic box with a coaxial cable elapsing out of the box for connecting to radio transmitter and/or receiver.
8) Antenna according to claims 1 - 7 characterized in that a signal from radio transmitter and/or receiver connects to an antenna element and that its ground connects to the surrounding electrically conductive material
PCT/SE2010/000020 2009-02-04 2010-01-28 Antenna WO2010090573A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP10738804A EP2394331A1 (en) 2009-02-04 2010-01-28 Antenna

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
SE0900132A SE533466C2 (en) 2009-02-04 2009-02-04 Antenna
SE0900132-2 2009-02-04

Publications (1)

Publication Number Publication Date
WO2010090573A1 true WO2010090573A1 (en) 2010-08-12

Family

ID=42542284

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/SE2010/000020 WO2010090573A1 (en) 2009-02-04 2010-01-28 Antenna

Country Status (3)

Country Link
EP (1) EP2394331A1 (en)
SE (1) SE533466C2 (en)
WO (1) WO2010090573A1 (en)

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2012170579A1 (en) * 2011-06-08 2012-12-13 Amazon Technologies Inc. Multi-band antenna
EP2741706A1 (en) * 2011-08-12 2014-06-18 Given Imaging Ltd. Wearable antenna assembly for an in- vivo device
JP2015050517A (en) * 2013-08-30 2015-03-16 国立大学法人 長崎大学 Reverse f planar antenna and antenna system
CN104466373A (en) * 2013-09-24 2015-03-25 智易科技股份有限公司 Monopole coupling type dual-frequency antenna
US8994596B2 (en) 2011-08-04 2015-03-31 Arcadyan Technology Corporation Multi-band antenna
JP5824563B1 (en) * 2014-09-22 2015-11-25 学校法人智香寺学園 Small slot antenna
EP2610967B1 (en) * 2011-12-28 2018-04-04 Acer Incorporated Communication device and antenna structure therein

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2002043182A1 (en) * 2000-11-24 2002-05-30 Siemens Aktiengesellschaft Pifa antenna device for mobile communication terminals
WO2004045019A2 (en) * 2002-11-08 2004-05-27 Centurion Wireless Technologies, Inc. Optimum utilization of slot gap in pifa design
WO2005008834A1 (en) * 2003-07-16 2005-01-27 Centurion Wireless Technologies, Inc. Antenna with shorted active and passive planar loops and method of making the same
US20070030200A1 (en) * 2005-08-04 2007-02-08 Heng Chew C Multi-band antenna structure
EP1760827A1 (en) * 2005-09-01 2007-03-07 Pantech & Curitel Communications Inc Mobile communication terminal having electrostatic discharge protection function

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2002043182A1 (en) * 2000-11-24 2002-05-30 Siemens Aktiengesellschaft Pifa antenna device for mobile communication terminals
WO2004045019A2 (en) * 2002-11-08 2004-05-27 Centurion Wireless Technologies, Inc. Optimum utilization of slot gap in pifa design
WO2005008834A1 (en) * 2003-07-16 2005-01-27 Centurion Wireless Technologies, Inc. Antenna with shorted active and passive planar loops and method of making the same
US20070030200A1 (en) * 2005-08-04 2007-02-08 Heng Chew C Multi-band antenna structure
EP1760827A1 (en) * 2005-09-01 2007-03-07 Pantech & Curitel Communications Inc Mobile communication terminal having electrostatic discharge protection function

Cited By (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US9225063B2 (en) 2011-06-08 2015-12-29 Amazon Technologies, Inc. Multi-band antenna
JP2014520448A (en) * 2011-06-08 2014-08-21 アマゾン テクノロジーズ インコーポレイテッド Multiband antenna
US8872712B2 (en) 2011-06-08 2014-10-28 Amazon Technologies, Inc. Multi-band antenna
WO2012170579A1 (en) * 2011-06-08 2012-12-13 Amazon Technologies Inc. Multi-band antenna
US8994596B2 (en) 2011-08-04 2015-03-31 Arcadyan Technology Corporation Multi-band antenna
EP2741706A1 (en) * 2011-08-12 2014-06-18 Given Imaging Ltd. Wearable antenna assembly for an in- vivo device
JP2014525276A (en) * 2011-08-12 2014-09-29 ギブン イメージング リミテッド Wearable antenna assembly for in-vivo devices
EP2741706A4 (en) * 2011-08-12 2015-01-14 Given Imaging Ltd Wearable antenna assembly for an in- vivo device
EP2610967B1 (en) * 2011-12-28 2018-04-04 Acer Incorporated Communication device and antenna structure therein
JP2015050517A (en) * 2013-08-30 2015-03-16 国立大学法人 長崎大学 Reverse f planar antenna and antenna system
EP2851998A3 (en) * 2013-09-24 2015-06-03 Arcadyan Technology Corporation Dual-band monopole coupling antenna
CN104466373A (en) * 2013-09-24 2015-03-25 智易科技股份有限公司 Monopole coupling type dual-frequency antenna
JP5824563B1 (en) * 2014-09-22 2015-11-25 学校法人智香寺学園 Small slot antenna

Also Published As

Publication number Publication date
SE0900132A1 (en) 2010-08-05
EP2394331A1 (en) 2011-12-14
SE533466C2 (en) 2010-10-05

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