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EP1387434A1 - Breitbandige Antenne mit erweiterter Massefläche in einem tragbaren Gerät - Google Patents

Breitbandige Antenne mit erweiterter Massefläche in einem tragbaren Gerät Download PDF

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Publication number
EP1387434A1
EP1387434A1 EP02018940A EP02018940A EP1387434A1 EP 1387434 A1 EP1387434 A1 EP 1387434A1 EP 02018940 A EP02018940 A EP 02018940A EP 02018940 A EP02018940 A EP 02018940A EP 1387434 A1 EP1387434 A1 EP 1387434A1
Authority
EP
European Patent Office
Prior art keywords
pcb
antenna
ground plane
antenna device
loop
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
EP02018940A
Other languages
English (en)
French (fr)
Other versions
EP1387434B1 (de
Inventor
Johan Anton Eduard Rosenberg
Johan Schreuder
Tjapko Uildriks
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.)
Sony Mobile Communications AB
Original Assignee
Sony Ericsson Mobile Communications 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 Sony Ericsson Mobile Communications AB filed Critical Sony Ericsson Mobile Communications AB
Priority to EP20020018940 priority Critical patent/EP1387434B1/de
Priority to AU2003257414A priority patent/AU2003257414A1/en
Priority to PCT/EP2003/006109 priority patent/WO2003107473A2/en
Priority to US10/517,902 priority patent/US7319433B2/en
Publication of EP1387434A1 publication Critical patent/EP1387434A1/de
Application granted granted Critical
Publication of EP1387434B1 publication Critical patent/EP1387434B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime 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
    • H01Q1/48—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
    • H01Q1/12—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
    • H01Q1/241—Supports; Mounting means by structural association with other equipment or articles with receiving set used in mobile communications, e.g. GSM
    • H01Q1/242—Supports; Mounting means by structural association with other equipment or articles with receiving set used in mobile communications, e.g. GSM specially adapted for hand-held use
    • H01Q1/243—Supports; Mounting means by structural association with other equipment or articles with receiving set used in mobile communications, e.g. GSM specially adapted for hand-held use with built-in antennas

Definitions

  • the present invention relates to an antenna device for use in a small portable device. More specifically, the invention relates to a wideband antenna having sufficient efficiency for meeting the requirements of different communications protocols. Also, the antenna reduces the power consumption of the small portable device so it can operate longer on a small battery.
  • Examples of a small portable device is e.g. a headset for wireless communication through an antenna with a mobile communication apparatus, such as a mobile telephone, a Bluetooth device, or any portable or stationary electronic device.
  • a mobile communication apparatus such as a mobile telephone, a Bluetooth device, or any portable or stationary electronic device.
  • a small portable device is, as indicated, characterized in that it is small and light. Therefore, it is preferred if the antenna used in such a device is small, light, and efficient.
  • the small portable device may communicate using a communication protocol, such as the Bluetooth, the WLAN (Wireless Local Area Network), the UMTS (Universal Mobile Telecommunications System), or the GSM (Global System for Mobile communications) protocol.
  • a communication protocol such as the Bluetooth, the WLAN (Wireless Local Area Network), the UMTS (Universal Mobile Telecommunications System), or the GSM (Global System for Mobile communications) protocol.
  • an antenna for a small portable device is a monopole antenna, which extends out of the product.
  • Another solution is a PIFA (Planar Inverted F Antenna) antenna.
  • PIFA Planar Inverted F Antenna
  • the known antennas all need ground planes, which are too big to fit in a small portable device.
  • the size of the small portable device causes problems for the antenna design, as it entails limited battery capacity. This means that the antenna should have a high efficiency in order not to waste battery power. Small antennas have lower efficiency than big antennas. As the device is small, the ground plane will also be small. An antenna requires a certain ground plane size to achieve a certain bandwidth, which is necessary for the antenna to be able to operate under a specific communications protocol, which always requires a certain bandwidth.
  • the object of the present invention is to provide an antenna device, which is sufficiently small to fit in small portable devices and which has efficiency and bandwidth to meet requirements of known and future communications protocols.
  • an antenna device for a portable device which comprises a folded antenna loop of conducting material having first and second ends to be connected to radio frequency (RF) circuitry and a ground plane of a PCB, respectively. Further, the antenna device comprises a ground plane extender positioned in the extension of a first side of the PCB.
  • the antenna extender is at least one battery casing of a battery cell having a position to serve as an extension of the ground plane of the PCB.
  • the antenna loop comprises first and second connectors provided at a second side of the PCB for connecting the antenna loop to the RF circuitry and the ground plane of the PCB, respectively.
  • the antenna loop comprises:
  • the PCB of the antenna device is a multi layer PCB having one layer used as a dedicated RF ground plane, which also serves as the ground plane of the antenna device.
  • the antenna loop is positioned opposite a first or a second surface of the PCB.
  • the material of the antenna loop is any well conducting material, such as metal.
  • the antenna loop is provided as a U-shaped dielectric having the antenna shape etched into the dielectric.
  • Still another embodiment is to provide the antenna loop inside the PCB as an element thereof.
  • the antenna device may be provided with a bezel, which is connected to the PCB, for fending off ESD (Electrostatic Discharges) discharges.
  • the bezel extends from the third side of the PCB towards the fourth side of the PCB.
  • the antenna device may be provided with bezel flanges connected to the ground plane of the PCB, which extends along the third and fourth sides of said PCB.
  • a further object of the invention is to provide an PCB comprising an antenna device, which is sufficiently small to fit in small portable devices, and which has good performance to meet requirements of communications protocols.
  • PCB printed circuit board
  • the efficiency of the antenna device should be high to keep the power consumption low.
  • a portable device comprising the antenna device according to above achieves the above objects.
  • the portable communication device is a headset.
  • An advantage of an antenna device according to the present invention is that it is sufficiently small to fit into small portable devices and still provides good efficiency and high bandwidth. Therefore, the antenna device can be adapted to meet requirements of several different communications protocols. Also, as the PCB of the antenna device may be decreased, the weight and the cost of the antenna device are also decreased.
  • Fig. 1 is a small portable communication device illustrated as a headset 1, which is adapted for wireless communication with a mobile telephone 2.
  • the small portable device could be any electronic communication device, which has to be small to meet user preferences and which is adapted to communicate wirelessly with another communication device, which may be stationary or portable.
  • the headset 1 comprises a microphone 3 and a loudspeaker 4, through which a user of the headset 1 may receive and transmit speech to the mobile telephone 2 through a wireless connection 5. Also, it is equally possible to communicate any data between the small portable device and the mobile telephone 2.
  • a first general embodiment of an antenna device 10 according to the invention is shown, which may be positioned in the proximity of the loudspeaker 4 of Fig 1.
  • the antenna device 10 comprises a half-wave folded antenna loop 11 having first 12, second 13, and third 14 portions, respectively, each having a first and a second end.
  • a first connector 15a is connected to the first end of the first portion 12, and a second connector 15b is connected to the second end of the third portion 14.
  • the first end of the second portion 13 is connected to the second end of the first portion 12, and the second end of the second portion 13 is connected to the first end of the third portion 14.
  • the antenna loop 11 is provided opposite a first front surface of the PCB 16. However, the antenna loop 11 may equally be positioned opposite a second rearwardly facing surface of the PCB 16.
  • the antenna loop 11 is connected, through the connectors 15a, 15b, to radio circuitry and a ground plane within the PCB 16, respectively.
  • the PCB 16 can be made out of any known PCB, as long as one layer is used as a dedicated RF (Radio Frequency) ground plane, which also serves as the ground plane of the antenna device 10.
  • the connectors may be a part of the antenna loop 11 connected to the PCB 16 via holes provided in the PCB.
  • the connectors may be provided at an angle ⁇ in relation antenna loop 11 and the PCB 16. This will shorten the total length of the antenna device compared to if the angle ⁇ is 90°. If the connectors are provided essentially perpendicular to the PCB 16, the total length of the antenna is longer. However, if the connectors are folded with the angle ⁇ the antenna solution is made shorter without effecting the antenna performance.
  • Batteries 17a, 17b are positioned at a first side of the PCB 16.
  • the position of the batteries 17a, 17b in relation to the PCB 16 and the connectors 15a, 15b is important for the performance of the antenna device 10, as will be further explained below.
  • two batteries 17a, 17b are shown. However, any suitable number of batteries may be utilized, depending on the actual configuration.
  • the batteries 17a, 17b can be of any configuration, technology or size suitable with the headset 1, as long as they are provided in a battery casing.
  • the antenna device 10 is a loop antenna, wherein the antenna loop 11 is made out of a metal, such as copper. However, any well conducting material can be used. As an alternative embodiment, the antenna loop could be provided as a loop on one layer of a multi-layer PCB 16. Still another embodiment is to provide the antenna loop 11 as a component formed as a U-shaped dielectric with the antenna loop etched into it (like a thick PCB), making it suitable for SMT (Surface Mounted Technology) pick and place machines. As is shown in Fig 2, the first connector 15a is connected to the PCB at a second side thereof, which is opposite the first side of the PCB 16.
  • SMT Surface Mounted Technology
  • the first portion 12 extends along a third side of the PCB 16 towards the first side of the PCB.
  • the second portion 13 extends from the second end of the first portion 12 towards a fourth side of the PCB 16.
  • the third portion 14 extends from the second end of the second portion 13 along the fourth side of the PCB 16 towards the second antenna connector 15b, which is connected to the PCB 16 at the second side thereof.
  • the shape of the antenna loop 11 is not fixed, as can be seen from a second embodiment shown in Fig. 3.
  • Like numerals of Fig. 3 correspond to like numerals of Fig. 2. Consequently, the antenna connectors 15a, 15b of Fig. 2 correspond to antenna connectors 25a, 25b of Fig. 3, the antenna loop 11 of Fig. 2 corresponds to an antenna loop 21 of Fig. 3 etc.
  • the angle between the first portion 22 and the second portion 23, respectively is less than 90 degrees. The same applies for the angle between the second and third portions 23, 24. However, the angles may be more than 90 degrees (not shown). Further, the first 23 and third 24 portions do not have to be straight, but can be folded. Consequently, the exact design of the antenna loop 11, 21 is not fixed, and has to be thoroughly tested and evaluated in each specific case.
  • the second embodiment of the antenna device 20 shown in Fig. 2 comprises a bezel 28.
  • the bezel 28 is provided between the antenna loop 21 and the batteries 27a, 27b, and is connected to the PCB 26.
  • the bezel 28 is optional and utilized for fending off ESD (Electrostatic Discharge) discharges.
  • ESD Electrostatic Discharge
  • the bezel extends from the third side of the PCB 26 towards the fourth side of the PCB 26.
  • it is made of a metal sheet, but can be made of any well conducting material.
  • Fig. 4 a third embodiment of the invention is shown. Like numerals in Fig. 4 correspond to like numerals of Fig. 2 according to the same pattern as was described in relation to Fig. 3.
  • the bezel 38 is provided with bezel flanges 39a, 39b extending along the third and fourth sides of the PCB 36.
  • the bezel flanges 39a, 39b are, via the bezel 38, also connected to the PCB 36 and improves ESD robustness without influencing the antenna performance negatively.
  • the bezel flanges 39a, 39b may be provided without the bezel 38.
  • a ground plane extender is provided in the extension of the first side of the PCB. Any well conducting material will function as the extender.
  • the battery cell provided in a battery casing made of a conducting material, such as metal, may provide the ground plane extender. Consequently, the batteries 17a, 17b, 27a, 27b, 37a, 37b will act as an extension of the ground plane of the PCB 16, 26, 36 if they are positioned in the extension of the first side of the PCB 16, 26, 36, which is opposite the second side where the connectors 15a, 15b, 25a, 25b, 35a, 35b are connected to the PCB 16, 26, 36.
  • the position of the at least one battery 17a, 17b, 27a, 27b, 37a, 37b is important for the antenna performance.
  • the batteries 17a, 17b, 27a, 27b, 37a, 37b are not directly connected to the ground plane of the PCB 16, 26, 36 they will act together with the ground plane of the PCB to form an extended ground plane, which is larger than the actual ground plane of the PCB. Therefore, the antenna loop 11, 21, 31 will experience a ground plane which is sufficiently large without actually providing a ground plane having an actual size to achieve a certain bandwidth to meet requirements of a certain communications protocol. Consequently, the PCB 16, 26, 36 may be decreased if the batteries 17a, 17b, 27a, 27b, 37a, 37b are provided in a position for extending the ground plane. Therefore, the dimensioning of the antenna and the small portable device can be made small, and light.
  • the distance d between the PCB 16, 26, 36 and the batteries 17a, 17b, 27a, 27b, 37a, 37b is approximately about 1 mm in the shown embodiments. However, the distance d has to be tested and evaluated in each specific case.
  • a further tuning parameter of the antenna device 10, 20, 30 is that the connectors 15a, 15b, 25a, 25b, 35a, 35b should preferably be provided as close as possible to the edge of the second side of the PCB 16, 26, 36. The closer the connectors 15a, 15b, 25a, 25b, 35a, 35b are to the edge of the second side of the PCB 16, 26, 36, the more bandwidth is gained.
  • the first and second portions 12, 22, 32, 13, 23, 33 of the antenna loop, respectively should preferably be provided as close as possible to the third and fourth side of the PCB 16, 26, 36, respectively. The closer said portions are to the third and fourth sides of the PCB, the more bandwidth is gained.
  • the antenna design according to the invention is sufficiently efficient to be adapted for communicating according to several protocols, such as Bluetooth, WLAN, GSM, UMTS, ISM etc.
  • tuning parameters for adapting the antenna to a specific protocol such as the length of the antenna loop 11 (half wave antenna loop), the length L1 of the first and third portions 12, 14, respectively, the length L2 of the second portion 13, the length L3 and width W1, W2 of the PCB 16, the length L4 and width W3 of the batteries 17a, 17b, the height H of the antenna loop 11 above the PCB 16, the distance D between the connectors 15a, 15b, the thickness T of the antenna loop 11, the distance d between the PCB 16 and the batteries 17a, 17b, the angle ⁇ between the first and third portions 12, 14 and the connectors 15a, 15b, as is indicated in Fig. 2.
  • a preferred thickness of the antenna loop is about 0.1-1 mm.
  • the embodiment shown in Fig. 3 is adapted for communication according to the Bluetooth protocol, wherein the center frequency is around 2,4-2,5 GHz, and has the following approximate dimensions: L1 22 mm L2 13.4 mm L3 38 mm L4 20 mm W1 10 mm W2 16 mm W3 16.5 mm (together) D 7.5 mm T 0.1-1 mm W4 2.3 mm H 5.1 mm d 1 mm ⁇ 50°
  • Fig. 5 a log-mag diagram and in Fig. 6 a Smith chart of a measurement made on a prototype of the embodiment of Fig. 3 are shown.
  • the measurement is made with a human body behind the antenna device in order to make the measurement as realistic as possible. From Fig. 5 and Fig 6 of a measurement made on a prototype of the embodiment of Fig. 3 it can be concluded that the antenna device shows good performance, meeting the bandwidth requirements of the Bluetooth protocol.
  • the antenna will be more sensitive to the environment, such as the microphone 3, the loudspeaker 4, the user of the headset 1, and other electronic components of the headset, and vice versa.
  • the first, second and third portions of the antenna loop may be provided in different planes. Each portion can be provided in a different plane if preferred.
  • the antenna has an input impedance of 50 ohm, and therefore no impedance matching circuits are needed to match the antenna to the RF circuitry of the PCB.
  • the present invention has been described with reference to a few alternative embodiments. However, the embodiments are only for exemplifying purposes and should not be taken as limiting the scope of the invention, which is best defined by the appended independent claims. All dimensions of the antenna device according to the invention have to be thoroughly tested and evaluated in each specific case. Further, the invention has been described in relation to a headset. However, the invention can be adapted to and utilized in any small portable device. Also, the antenna device can be used in other portable devices, such as mobile telephones, mobile terminals, smartphones, or the like, where a small and efficient antenna design is preferred.

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Support Of Aerials (AREA)
  • Transceivers (AREA)
EP20020018940 2002-06-01 2002-08-26 Breitbandige Antenne mit erweiterter Massefläche in einem tragbaren Gerät Expired - Lifetime EP1387434B1 (de)

Priority Applications (4)

Application Number Priority Date Filing Date Title
EP20020018940 EP1387434B1 (de) 2002-06-13 2002-08-26 Breitbandige Antenne mit erweiterter Massefläche in einem tragbaren Gerät
AU2003257414A AU2003257414A1 (en) 2002-06-13 2003-06-11 Wideband antenna device with extended ground plane in a portable device
PCT/EP2003/006109 WO2003107473A2 (en) 2002-06-01 2003-06-11 Wideband antenna device
US10/517,902 US7319433B2 (en) 2002-06-13 2003-06-11 Wideband antenna device with extended ground plane in a portable device

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
EP02013085 2002-06-13
EP02013085 2002-06-13
EP20020018940 EP1387434B1 (de) 2002-06-13 2002-08-26 Breitbandige Antenne mit erweiterter Massefläche in einem tragbaren Gerät

Publications (2)

Publication Number Publication Date
EP1387434A1 true EP1387434A1 (de) 2004-02-04
EP1387434B1 EP1387434B1 (de) 2007-10-24

Family

ID=30116890

Family Applications (1)

Application Number Title Priority Date Filing Date
EP20020018940 Expired - Lifetime EP1387434B1 (de) 2002-06-01 2002-08-26 Breitbandige Antenne mit erweiterter Massefläche in einem tragbaren Gerät

Country Status (1)

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EP (1) EP1387434B1 (de)

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5020136A (en) * 1986-04-21 1991-05-28 Motorola, Inc. Battery pack antenna suitable for use with two-way portable transceivers
US6266019B1 (en) * 2000-07-21 2001-07-24 Ericsson Inc. System for increasing antenna efficiency
WO2001076006A1 (en) * 2000-03-30 2001-10-11 Avantego Ab Antenna arrangement

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5020136A (en) * 1986-04-21 1991-05-28 Motorola, Inc. Battery pack antenna suitable for use with two-way portable transceivers
WO2001076006A1 (en) * 2000-03-30 2001-10-11 Avantego Ab Antenna arrangement
US6266019B1 (en) * 2000-07-21 2001-07-24 Ericsson Inc. System for increasing antenna efficiency

Also Published As

Publication number Publication date
EP1387434B1 (de) 2007-10-24

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