EP3244486A1 - Antennenvorrichtung für die koexistenz von drahtlossystemen - Google Patents

Antennenvorrichtung für die koexistenz von drahtlossystemen Download PDF

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Publication number
EP3244486A1
EP3244486A1 EP16305532.0A EP16305532A EP3244486A1 EP 3244486 A1 EP3244486 A1 EP 3244486A1 EP 16305532 A EP16305532 A EP 16305532A EP 3244486 A1 EP3244486 A1 EP 3244486A1
Authority
EP
European Patent Office
Prior art keywords
antenna
slot
antennas
conductive layer
antenna device
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Withdrawn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
EP16305532.0A
Other languages
English (en)
French (fr)
Inventor
Dominique Lo Hine Tong
Christophe Vidon
François BARON
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.)
Thomson Licensing SAS
Original Assignee
Thomson Licensing SAS
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 Thomson Licensing SAS filed Critical Thomson Licensing SAS
Priority to EP16305532.0A priority Critical patent/EP3244486A1/de
Priority to PCT/EP2017/060122 priority patent/WO2017194325A1/en
Publication of EP3244486A1 publication Critical patent/EP3244486A1/de
Withdrawn legal-status Critical Current

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Classifications

    • 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
    • H01Q1/521—Means for reducing coupling between antennas; Means for reducing coupling between an antenna and another structure reducing the coupling between adjacent antennas
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q13/00—Waveguide horns or mouths; Slot antennas; Leaky-waveguide antennas; Equivalent structures causing radiation along the transmission path of a guided wave
    • H01Q13/10—Resonant slot antennas
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q21/00—Antenna arrays or systems
    • H01Q21/28—Combinations of substantially independent non-interacting antenna units or systems

Definitions

  • the present invention relates generally to the field of antennas for wireless systems. Particularly but not exclusively, embodiments of the invention relate to antenna devices comprising at least two antennas printed on a printed circuit board and arranged to operate on a time sharing transmission model, one of the antennas being a slot-type antenna.
  • multimedia devices now comprise one or more antennas for exchanging data signals with other multimedia devices. These devices may comprise one or several antennas for transmitting and/or receiving data signals according to different communication standards.
  • the multimedia device may for example comprise one or more antenna(s) for Wi-Fi communication and an antenna for Bluetooth (also referred to as BT) communication.
  • Embodiments of the present invention will be introduced for a system comprising two MIMO antennas for Wi-Fi transmissions and one antenna for BT transmissions but it will be appreciated that the invention is not limited to such a system.
  • Fig.1 represents a basic architecture of a printed circuit board (or PCB) 10 used for implementing such a system.
  • the PCB 10 comprises two antennas, 11 and 12, for Wi-Fi communication and one antenna 13 for BT communication. These antennas are connected to respective radio chains.
  • Wi-Fi and BT operate in the same frequency band, between 2.4 and 2.5GHz, interference issues arise when they operate simultaneously. There are two ways to manage these interference issues:
  • Embodiments of the present invention concern devices wherein the second way is applied.
  • Dedicated algorithms are used to control the radios according to a time sharing transmission model.
  • embodiments of the present invention concerns antenna devices comprising at least two antennas operating in a same frequency band or close frequency bands, one of the two antennas being a slot-type antenna.
  • the presence of the slot of the slot-type antenna has a negative impact on the efficiency of the other antennas of the device when they are in operation.
  • the efficiency of the other antennas is reduced by a few percent (10% in the case of the antenna device of Figs.1 to 5 ).
  • Embodiments of the present invention set out to to alleviate at least partially this drawback.
  • a first aspect of the invention relates to an antenna device comprising a printed circuit board and at least first and second antennas printed on said printed circuit board, the printed circuit board comprising at least one conductive layer, wherein said first and second antennas are arranged to operate on a time sharing transmission model, and wherein the second antenna comprises a slot etched in said conductive layer, said slot having an open end at an edge of said conductive layer.
  • the antenna device comprises a shunt circuit for shunting the open end of the slot of the second antenna when the first antenna is in operation.
  • the slot-type antenna disrupt the flow of ground currents in the conductive layer of the printed circuit board when the first antenna is in operation.
  • the open end of the slot is shunted when the first antenna is in operation in order to reduce the impact of the slot on the ground currents in the conductive layer of PCB when the first antenna is in operation. Consequently, the efficiency of the first antenna is improved.
  • the shunt circuit comprises a PIN diode.
  • the PIN diode is biased when the first antenna is in operation.
  • the antenna device comprises a bias circuit for biasing the PIN diode, said bias circuit being synchronized on the operation of the first antenna.
  • the first and second antennas operate in a same frequency band, for example the frequency band [2.4-2.5 GHz].
  • Embodiments of the invention will be described by comparing the simulation results of the antenna system of Fig.1 (prior art) with the simulation results of a same antenna system equipped with a shunt circuit for shunting the open end of the slot-type antenna (embodiment of the invention).
  • Figs.1 to 7 refer to an antenna system not equipped with a shunt circuit as proposed by embodiments of the present invention while Figs.8 to 10 refer to a same system antenna equipped with a shunt circuit as proposed by an embodiment of the present invention.
  • the antenna system comprises a printed circuit board 10 and three antennas 11 to 13 printed on the printed circuit board.
  • the printed circuit board 10 comprises a multi-layered substrate comprising three conductive layers separated from each other by dielectric layers.
  • the antennas 11 and 12 are two identical dual-band MIMO antennas for Wi-Fi communications. These antennas are described in detail in the patent application EP2790268A1 .
  • each of these antennas comprises two cascaded PIFAs (Printed Inverted-F Antenna) each resonating in a specific portion of the Wi-Fi bands.
  • the dual-band antenna 11 comprises a first PIFA 21 on a first conductive layer and a second PIFA 22 on a second conductive layer.
  • the ground planes are on both conductive layers.
  • the PIFAs are cascaded in order to achieve a compact antenna.
  • the first PIFA 21 comprises a first radiating element 210, a first feed element 211 connected to the first radiating element and a first ground return element 212
  • the second PIFA 22 comprises a second radiating element 220, a second feed element 221 connected to the second radiating element and a second ground return element 222. Both ground return elements 212 222 are connected to the ground planes of all layers.
  • Impedance matching components 23 are also provided at the common feeding port of the antenna.
  • the operation and the detailed structure of such an antenna are described in detail in the patent application EP2790268A1 as mentioned before.
  • other Wi-Fi antenna structures could be used for presenting embodiments of the invention.
  • the antenna 13 which is the BT antenna, is a compact slot antenna which described in detail in the patent application EP2725658A1 .
  • This antenna is briefly described hereinafter by referring to Figs.3 to 5 .
  • M1, M2 and M3 designate the three superimposed conductive layers of the printed circuit board. These conductive layers are separated by dielectric layers D1 and D2. These layers are visible on Fig.4 .
  • the antenna 13 is formed by a slot-line 30 etched in the intermediate conductive layer M2 and excited at the feeding point F by electromagnetic coupling with a feeding line 34 realised in micro-strip technology, either on the upper face of the dielectric layer D1 or on the lower face of the dielectric layer D2.
  • the slot-line 30 continues by a slot-line 31 realised in the upper conductive layer M1 then by a slot-line 32 realised in the lower conductive layer M3, the slot-lines 30, 31, 32 being superimposed and their total electrical length being equal to k* ⁇ g where ⁇ g is the wavelength at the operating frequency.
  • the feeding line 34 is connected to an impedance matching circuit 35.
  • the slot-line 31 realised in the conductive layer M1 is delimited by two conductive strips S31 and S'31.
  • the slot-line 32 is delimited by two conductive strips S32, S'32 in the conductive layer M3.
  • the different conductive strips are interconnected in the following manner.
  • the intermediate conductive layer M2 has, on each side of the slot-line 30, at the feeding side, two apertures W, W' through which pass two via-holes V1, V1' respectively connecting one of the ends of the conductive strip S31 to the corresponding end of the conductive strip S32 and one of the ends of the conductive strip S'31 with the corresponding end of the conductive strip S'32.
  • the other end of the conductive strip S31 is connected through a via-hole V2 to the conductive layer M2 and to an isolated element EM of the conductive layer M3 located in the continuation of the conductive strip S32.
  • the end of the conductive strip S'31 is connected to the intermediate layer M2 and to an isolated element EM' of the conductive layer M3 located in the continuation of the conductive strip S'32.
  • This enables a connection to be obtained between the different slot-lines 30, 31, 32 as shown by the arrows in FIG.4 .
  • These antennas have been 3D electromagnetically simulated with predefined mechanical and environmental constraints. The simulation results are illustrated by graphs of Fig.6 and Fig.7 .
  • Fig.6 shows the isolation between the antenna 12 (Wi-Fi antenna) and the antenna 13 (BT antenna). As can be seen in this figure, the isolation level is around 11dB in the 2.4-2.5 GHz band. This level is low.
  • Fig.7 shows two curves illustrating the efficiency of the antenna 12 in the presence and in the absence of the slot-type antenna 13. This Figure shows that, in presence of the slot-type antenna, the efficiency of the antenna 12 is reduced by around 10-12%, from around 70% to less than 60%, which is critical.
  • the antenna device with a shunt circuit for shunting the open end of the slot of the slot-type antenna when the other antenna(s) of the antenna system is in operation in order to preserve the intrinsic performances of this or these other antenna(s).
  • a shunt circuit 35 is provided between both sides of the open end of the slot of the antenna 13.
  • shunt circuit 35 is shown schematically on Fig.8 . It comprises a PIN diode 350 and a bias circuit 351 for biasing the PIN diode, the whole circuit being placed between two connexion points P1 and P2 connected to both sides of the open end of the slot of the slot-type antenna.
  • the bias circuit 351 comprises two capacitors C1 and C2 and an inductor L1 arranged to bias the diode 350 and control its state (conducting or not conducting) as a function of a control voltage Vb.
  • Such a bias circuit is well known in the art.
  • the role of the shunt circuit 35 is to neutralize the effect of the slot on the surrounding antennas of the antenna device when the latter are in operation.
  • the shunting of the open end of the slot of the antenna 13 has been simulated by providing the open end of the slot of the antenna 13 with a short circuit SC acting as a shunt circuit as shown in Fig.9 .
  • a metal strip forming the short circuit SC is placed at the open end of the slot.
  • Fig.10 shows two curves illustrating the efficiency of the antenna 12 in the presence and in the absence of the slot-type antenna 13 equipped with the shunt circuit 35.
  • the efficiency of the antenna 12 is recovered when the slot of the antenna 13 is shunted.
  • This example shows that the efficiency degradation of the antenna 12 can be at least partially avoided by equipping the slot-type antenna 13 with a shunt circuit as disclosed hereinabove.
  • the shunt circuit is advantageously a PIN diode and the bias circuit of the PIN diode is synchronized on the operation of the antenna 12. More specifically, the biasing of the PIN diode is synchronized with the operation of the antenna 12 such that:
  • the antenna device comprises one slot-type antenna (antenna 13) and two PIFA antennas (antennas 11 and 12).
  • the antenna device could comprise only one slot-type antenna and one PIFA antenna.
  • the antenna(s) 11 and/or 12 are antennas designed on a PCB and not necessarily PIFA antennas.
  • the slot-type antenna (antenna 13) and the PIFA antennas (antennas 11 and 12) operates in a same frequency band.
  • Embodiments of the invention could be applied to antennas operating in close frequency bands.
EP16305532.0A 2016-05-09 2016-05-09 Antennenvorrichtung für die koexistenz von drahtlossystemen Withdrawn EP3244486A1 (de)

Priority Applications (2)

Application Number Priority Date Filing Date Title
EP16305532.0A EP3244486A1 (de) 2016-05-09 2016-05-09 Antennenvorrichtung für die koexistenz von drahtlossystemen
PCT/EP2017/060122 WO2017194325A1 (en) 2016-05-09 2017-04-27 Antenna device for the coexistence of wireless systems

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP16305532.0A EP3244486A1 (de) 2016-05-09 2016-05-09 Antennenvorrichtung für die koexistenz von drahtlossystemen

Publications (1)

Publication Number Publication Date
EP3244486A1 true EP3244486A1 (de) 2017-11-15

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Family Applications (1)

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EP16305532.0A Withdrawn EP3244486A1 (de) 2016-05-09 2016-05-09 Antennenvorrichtung für die koexistenz von drahtlossystemen

Country Status (2)

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EP (1) EP3244486A1 (de)
WO (1) WO2017194325A1 (de)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3540852A1 (de) * 2018-03-13 2019-09-18 Antennentechnik ABB Bad Blankenburg GmbH Mehrbereichsantenne für eine empfangs- und/oder sendeeinrichtung für den mobilen einsatz, insbesondere fahrzeugen, bestehend aus einer beidseitig kupferkaschierten leiterplatte

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0548975A1 (de) * 1991-12-26 1993-06-30 Kabushiki Kaisha Toshiba Tragbare Funk- und Funktelefongeräte mit Schlitzen darin
US20140043201A1 (en) * 2012-08-09 2014-02-13 Intel Mobile Communications GmbH Antenna system, method and mobile communication device
EP2725658A1 (de) 2012-10-23 2014-04-30 Thomson Licensing Kompakte Schlitzantenne
EP2790268A1 (de) 2013-04-12 2014-10-15 Thomson Licensing Mehrbandantenne
US20140333495A1 (en) * 2013-05-08 2014-11-13 Apple Inc. Electronic Device Antenna With Multiple Feeds for Covering Three Communications Bands

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0548975A1 (de) * 1991-12-26 1993-06-30 Kabushiki Kaisha Toshiba Tragbare Funk- und Funktelefongeräte mit Schlitzen darin
US20140043201A1 (en) * 2012-08-09 2014-02-13 Intel Mobile Communications GmbH Antenna system, method and mobile communication device
EP2725658A1 (de) 2012-10-23 2014-04-30 Thomson Licensing Kompakte Schlitzantenne
EP2790268A1 (de) 2013-04-12 2014-10-15 Thomson Licensing Mehrbandantenne
US20140333495A1 (en) * 2013-05-08 2014-11-13 Apple Inc. Electronic Device Antenna With Multiple Feeds for Covering Three Communications Bands

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3540852A1 (de) * 2018-03-13 2019-09-18 Antennentechnik ABB Bad Blankenburg GmbH Mehrbereichsantenne für eine empfangs- und/oder sendeeinrichtung für den mobilen einsatz, insbesondere fahrzeugen, bestehend aus einer beidseitig kupferkaschierten leiterplatte

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Publication number Publication date
WO2017194325A1 (en) 2017-11-16

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