EP2221914A1 - Antenne, Antennensystem und tragbare Funkkommunikationsvorrichtung mit solch einem Antennensystem - Google Patents

Antenne, Antennensystem und tragbare Funkkommunikationsvorrichtung mit solch einem Antennensystem Download PDF

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Publication number
EP2221914A1
EP2221914A1 EP09152428A EP09152428A EP2221914A1 EP 2221914 A1 EP2221914 A1 EP 2221914A1 EP 09152428 A EP09152428 A EP 09152428A EP 09152428 A EP09152428 A EP 09152428A EP 2221914 A1 EP2221914 A1 EP 2221914A1
Authority
EP
European Patent Office
Prior art keywords
radiating element
antenna
turn coil
multiple turn
radio communication
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Withdrawn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
EP09152428A
Other languages
English (en)
French (fr)
Inventor
Teresa Meier
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.)
Laird Technologies AB
Original Assignee
Laird Technologies 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 Laird Technologies AB filed Critical Laird Technologies AB
Priority to EP09152428A priority Critical patent/EP2221914A1/de
Priority to PCT/SE2010/050053 priority patent/WO2010093307A1/en
Publication of EP2221914A1 publication Critical patent/EP2221914A1/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Withdrawn legal-status Critical Current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
    • H01Q1/12—Supports; Mounting means
    • H01Q1/22—Supports; Mounting means by structural association with other equipment or articles
    • H01Q1/24—Supports; Mounting means by structural association with other equipment or articles with receiving set
    • 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
    • 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
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q7/00—Loop antennas with a substantially uniform current distribution around the loop and having a directional radiation pattern in a plane perpendicular to the plane of the loop
    • 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

Definitions

  • the present invention relates generally to antenna device and more particularly to an antenna device for use in a portable radio communication device providing FM operation.
  • Internal antennas have been used for some time in portable radio communication devices. There are a number of advantages connected with using internal antennas compared to protruding antennas, of which can be mentioned that they are small and light, making them suitable for applications wherein size and weight are of importance, such as in mobile phones, PDA, portable computer or similar devices.
  • the FM radio application is defined as frequencies between 88-108 MHz in most of the world and frequencies between 76-90 MHz in Japan.
  • Prior art conventional antenna configurations, such as loop antennas or monopole antennas, fitted within the casing of a portable radio communication device will result in unsatisfactory operation in that the antenna either has too bad performance over a sufficiently wide frequency band or sufficient performance over a too narrow frequency band.
  • a conventional FM antenna for portable radio communication devices is usually provided in the headset wire connected to the communication device.
  • This configuration with a relatively long wire permits an antenna length that is sufficient also for low frequency applications.
  • this solution is obviously not feasible.
  • a portable radio communication device is today many times provided with frequency operational coverage for other frequency bands then FM, such as GSM900, GSM1800, GPS, BT, WLAN, WCDMA and GPS.
  • FM such as GSM900, GSM1800, GPS, BT, WLAN, WCDMA and GPS.
  • a portable radio communication device has limited space and it is thus desirable to, if possible, add multiple functionality to an antenna device.
  • an FM antenna when used in a mobile phone, it is realized as a wire loop, which is shortcircuited to ground and strongly inductive, which makes a match to a certain impedance value (normally 50 Ohm) difficult. From a certain length, the wire loop provides sufficient gain to meet specifications for FM operation, but in such a case the loop runs over a large part of the mobile phone and hence causes unwanted EMI radiation.
  • a certain impedance value normally 50 Ohm
  • a planar multiple turn coil typically used for a Near Field Communication (NFC) application effect less space than a single turn coil, and causes less EMI radiation, but does not provide enough gain for FM operation in a mobile phone.
  • NFC Near Field Communication
  • An object of the present invention is to provide an FM antenna for a portable radio communication device, occupies limited space of the portable radio communication device.
  • an FM antenna for a portable radio communication device, wherein the FM antenna comprises a multiple turn coil radiating element connected to a monopole radiating element an effective FM antenna is achieved, which occupies limited space, causes reduced EMI radiation, and exhibits improved gain compared to a single loop FM antenna.
  • the monopole radiating element is connected to an outer end of the multiple turn coil radiating element and an inner end of the multiple turn coil radiating element is connectable to an FM receiver, whereby wiring is minimized.
  • the multiple turn coil radiating element is configured for near field communication operation, whereby both FM and NFC applications can be provided by the same antenna device.
  • the monopole radiating element is preferably configured to have a capacitance corresponding to the inductance of the multiple turn coil radiating element, whereby the antenna performance is improved.
  • an active antenna device By preferably providing the FM antenna with a high input impedance amplifier connected to the inner end, and optionally a varactor connected between the inner end and ground, an active antenna device can be achieved.
  • a passive antenna device By preferably providing the FM antenna with a standard (50 Ohm) amplifier connected to the inner end a passive antenna device can be achieved.
  • the FM antenna is advantageously provided with first switching means configured to connect the multiple turn coil radiating element to ground or to the monopole radiating element, and second switching means configured to connect the multiple turn coil radiating element to an FM receiver or to an NFC transceiver, in order to provide an antenna device having FM Rx and NFC functions.
  • first switching means configured to connect the multiple turn coil radiating element to ground or to the monopole radiating element
  • second switching means configured to connect the multiple turn coil radiating element to an FM receiver or to an NFC transceiver, in order to provide an antenna device having FM Rx and NFC functions.
  • An antenna system for a portable radio communication device, as well as a portable radio communication device, are provided.
  • radiating element is used. It is to be understood that this term is intended to cover electrically conductive elements arranged for receiving and/or transmitting radio signals.
  • the FM antenna comprises a multiple turn coil radiating element 2 and a monopole radiating element
  • An alternative configuration is achieved if the monopole radiating element 1 is connected to an inner end of the multiple turn coil radiating element 2, and an outer end of the multiple turn coil radiating element 2 is configured to be connected to an FM receiver or FM transceiver.
  • the alternative configuration usually entails longer connection wiring, which in that regard is a less attractive solution.
  • the monopole radiating element 1 is preferably arranged close to an edge/corner of a printed wiring board (PWB) of the portable radio communication device in which it is mounted in, in order to improve the gain of the FM antenna.
  • the gain is further improved by having the monopole radiating element 1 arranged partly or completely outside metalized parts of the PWB. If the monopole radiating element 1 is arranged over or partly over metalized part of the PWB the higher above thereof the better.
  • the monopole radiating element 1 is preferably arranged close to the multiple turn coil radiating element 2, in order to minimize wiring.
  • the size of the monopole radiating element 1 is preferably tuned to 93 MHz, which is approximately the middle of the FM band.
  • a typical size for the monopole radiating element 1 is 6x6 mm.
  • the multiple turn coil radiating element 2 preferably comprises as many turns as possible in an outer periphery thereof, to provide as large empty area therein as possible enclosed by the multiple turns. By having the inner coil area as large as possible the magnetic field created by multiple turn coil radiating element 2 is maximized.
  • the multiple turn coil radiating element 2 is preferably an NFC radiating element per se, i.e. configured for an NFC application, typically having an inductance value of 0.3-4 ⁇ H.
  • the NFC operation frequency is 13.56 MHz
  • a first example configuration of the multiple turn coil radiating elements 2 has a size of 25x10 mm, with 13 turns and an inductance of about 3.5 ⁇ H.
  • a second example configuration of the multiple turn coil radiating elements 2 has a size of 16x16 mm, with 11 turns and an inductance of about 3.5 ⁇ H.
  • the monopole radiating element 1 is configured to have a capacitance value approximately corresponding to the inductance of the multiple turn coil radiating element 2.
  • the FM antenna i.e. the monopole radiating element 1 and the multiple turn coil radiating element 2 together, resonate and radiate at the FM band with a centre frequency of about 92 MHz.
  • an FM antenna By having an FM antenna provided by the combination of a multiple turn coil radiating element 2 and a monopole radiating element 1, wherein their respective capacitance and inductance values balance each other, an FM antenna occupying limited space and providing a high gain is achieved.
  • the use of the multiple turn coil radiating element 2 in the FM antenna further gives the possibility to utilize it for an NFC application in the portable radio communication device.
  • the multiple turn coil radiating element is preferably a planar element. However, it can also be utilized folded over e.g. the edge of the PWB. Further, the multiple turn coil radiating element can be positioned perpendicular to the PWB, in front of the PWB edge. By being folded the NFC function is improved by reduced directive sensitivity, at the same time not decreasing the FM function. For best FM performance both the multiple turn coil radiating element and the monopole radiating element should be oriented in the same plan and in folded the same way.
  • FIG. 2 A second embodiment of an FM antenna for a portable radio communication device according to the present invention is illustrated in Fig. 2 .
  • This second embodiment of the present invention is identical to the first embodiment described above, apart from the following.
  • the monopole radiating element 1 is connected to an inner end of the multiple turn coil radiating element 2, which inner end of the multiple turn coil radiating element 2 is also configured to be connected to an FM receiver or FM transceiver. An outer end of the multiple turn coil radiating element 2 is grounded.
  • FIG. 3 A third embodiment of an FM antenna for a portable radio communication device according to the present invention is illustrated in Fig. 3 .
  • This third embodiment of the present invention is based on an FM antenna according to the first embodiment described above.
  • the FM antenna comprises a monopole radiating element 1 connected to an outer end of a multiple turn coil radiating element 2. An inner end of the multiple turn coil radiating element 2 is connected to an amplifier 3 configured to be connected to an FM receiver or FM transceiver.
  • a varactor 4 is preferably connected between ground and the inner end of the multiple turn coil radiating element 2 for tuning of the FM antenna.
  • a high input impedance amplifier 3 is used.
  • a passive FM antenna is utilized a typically 50 Ohm input impedance amplifier 3 is used.
  • FIG. 4 A fourth embodiment of an FM antenna for a portable radio communication device according to the present invention is illustrated in Fig. 4 .
  • This fourth embodiment of the present invention is based on an FM antenna according to the first embodiment described above.
  • the FM antenna comprises switching means 5 connecting an outer end of a multiple turn coil radiating element 2 to ground or to a monopole radiating element 1. An inner end of the multiple turn coil radiating element 2 is connected to a matching network 16.
  • the switching means 5 When the NFC transceiver 8 is operating the switching means 5 is connected to ground, and the FM antenna can be utilized for NFC applications. When the NFC transceiver 8 is not operating the switching means 5 is connected to the monopole radiating element 1 and the FM antenna can be utilized for FM operation as described below.
  • FIG. 5 A fifth embodiment of an antenna system for a portable radio communication device according to the present invention is illustrated in Fig. 5 .
  • This fifth embodiment of the present invention is based on an FM antenna according to the third embodiment described above.
  • the antenna system comprises a monopole radiating element 1 connected to an outer end of a multiple turn coil radiating element 2.
  • An amplifier 3, connected to an FM receiver 12, and an FM transmitter 13 are connected to an inner end of the multiple turn coil radiating element 2.
  • the amplifier 3 and the FM transmitter 13 are one at a time connected to the inner end of the multiple turn coil radiating element 2 through switching means 11.
  • the connection between the switching means 11 and the FM transmitter 13 is preferably grounded through a varactor 4, in order to tune the FM antenna for FM Tx.
  • a varactor can also be used to tune the antenna for FM Rx, arranged before the amplifier like in Fig. 3 .
  • FIG. 6 A sixth embodiment of an antenna system for a portable radio communication device according to the present invention is illustrated in Fig. 6 .
  • This sixth embodiment of the present invention is based on a combination of an FM antenna according to the third embodiment and the fourth embodiment, respectively, as described above.
  • the antenna system comprises first switching means 5 configured to connect an outer end of a multiple turn coil radiating element 2 to ground or to a monopole radiating element 1.
  • the antenna system further comprises second switching means 14 configured to connect an inner end of the multiple turn coil radiating element 2 to an amplifier 3, connected to an FM receiver 12, or to a matching network 16 connected to an NFC transceiver 8.
  • the first switching means 5 is connected to ground and the second switching means 14 is connected to the matching network 16.
  • the first switching means 5 is connected to the monopole radiating element 1 and the second switching means 14 is connected to the amplifier 3.
  • a varactor can be used to tune the FM antenna, like in Fig. 3 .
  • the switching means 5 and 14 can be exchanged with passive filters.
  • FIG. 7 A seventh embodiment of an antenna system for a portable radio communication device according to the present invention is illustrated in Fig. 7 .
  • This seventh embodiment of the present invention is based on a combination of an FM antenna according to the third, fourth and the fifth embodiments, respectively, as described above.
  • the antenna system comprises first switching means 5 configured to connect an outer end of a multiple turn coil radiating element 2 to ground or to a monopole radiating element 1.
  • the antenna system further comprises second switching means 17 configured to connect an inner end of the multiple turn coil radiating element 2 to an FM receiver 12, to a FM transmitter 13, or to a matching network connected to an NFC transceiver 8.
  • the first switching means 5 is connected to ground and the second switching means 17 is connected to the matching network.
  • the first switching means 5 is connected to the monopole radiating element 1.
  • the second switching means 17 is connected to the FM receiver 12, and for FM Tx the second switching means 17 is connected to the FM transmitter 13.
  • the first switching means 5 can be exchanged with a passive filter.
  • a varactor can be used to tune the FM antenna to FM RX or FM Tx, respectively.

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EP09152428A 2009-02-10 2009-02-10 Antenne, Antennensystem und tragbare Funkkommunikationsvorrichtung mit solch einem Antennensystem Withdrawn EP2221914A1 (de)

Priority Applications (2)

Application Number Priority Date Filing Date Title
EP09152428A EP2221914A1 (de) 2009-02-10 2009-02-10 Antenne, Antennensystem und tragbare Funkkommunikationsvorrichtung mit solch einem Antennensystem
PCT/SE2010/050053 WO2010093307A1 (en) 2009-02-10 2010-01-21 An antenna, an antenna system and a portable radio communication device comprising such an antenna system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP09152428A EP2221914A1 (de) 2009-02-10 2009-02-10 Antenne, Antennensystem und tragbare Funkkommunikationsvorrichtung mit solch einem Antennensystem

Publications (1)

Publication Number Publication Date
EP2221914A1 true EP2221914A1 (de) 2010-08-25

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EP09152428A Withdrawn EP2221914A1 (de) 2009-02-10 2009-02-10 Antenne, Antennensystem und tragbare Funkkommunikationsvorrichtung mit solch einem Antennensystem

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EP (1) EP2221914A1 (de)
WO (1) WO2010093307A1 (de)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2493010A1 (de) * 2011-02-28 2012-08-29 Laird Technologies AB Antennenanordnung und tragbare Funkkommunikationsvorrichtung mit einer solchen Antennenanordnung
US8344959B2 (en) 2009-04-30 2013-01-01 Nokia Corporation Multiprotocol antenna for wireless systems
US8610638B2 (en) 2011-01-17 2013-12-17 Nokia Corporation FM transmission using a RFID/NFC coil antenna

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US9831028B2 (en) 2011-12-21 2017-11-28 Intel Corporation Dissymmetric coil antenna to facilitate near field coupling

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS562707A (en) * 1979-06-21 1981-01-13 Tdk Corp Antenna
US6127979A (en) * 1998-02-27 2000-10-03 Motorola, Inc. Antenna adapted to operate in a plurality of frequency bands
GB2418782A (en) * 2004-09-30 2006-04-05 Radioscape Ltd Digital radio receiver with a multi-band antenna
WO2007072381A2 (en) * 2005-12-19 2007-06-28 Nxp B.V. Radio receiver, radio transmitter, and hearing aid

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6906672B1 (en) * 2003-07-25 2005-06-14 R.A. Miller Industries, Inc. Planar Antenna Arrangement
US20080191883A1 (en) * 2007-02-12 2008-08-14 Checkpoint Systems, Inc. Resonant tag

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS562707A (en) * 1979-06-21 1981-01-13 Tdk Corp Antenna
US6127979A (en) * 1998-02-27 2000-10-03 Motorola, Inc. Antenna adapted to operate in a plurality of frequency bands
GB2418782A (en) * 2004-09-30 2006-04-05 Radioscape Ltd Digital radio receiver with a multi-band antenna
WO2007072381A2 (en) * 2005-12-19 2007-06-28 Nxp B.V. Radio receiver, radio transmitter, and hearing aid

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8344959B2 (en) 2009-04-30 2013-01-01 Nokia Corporation Multiprotocol antenna for wireless systems
US8610638B2 (en) 2011-01-17 2013-12-17 Nokia Corporation FM transmission using a RFID/NFC coil antenna
EP2493010A1 (de) * 2011-02-28 2012-08-29 Laird Technologies AB Antennenanordnung und tragbare Funkkommunikationsvorrichtung mit einer solchen Antennenanordnung

Also Published As

Publication number Publication date
WO2010093307A1 (en) 2010-08-19

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