EP1981119B1 - Dispositif mobile de communication sans fil incluant une plaque connectée à la masse fournissant une réduction du taux d'absorption spécifique (SAT) et procédés correspondants - Google Patents

Dispositif mobile de communication sans fil incluant une plaque connectée à la masse fournissant une réduction du taux d'absorption spécifique (SAT) et procédés correspondants Download PDF

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Publication number
EP1981119B1
EP1981119B1 EP07105873.9A EP07105873A EP1981119B1 EP 1981119 B1 EP1981119 B1 EP 1981119B1 EP 07105873 A EP07105873 A EP 07105873A EP 1981119 B1 EP1981119 B1 EP 1981119B1
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EP
European Patent Office
Prior art keywords
dielectric substrate
carried
antenna
ground patch
ground
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.)
Active
Application number
EP07105873.9A
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German (de)
English (en)
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EP1981119A1 (fr
Inventor
Yihong Qi
Ying Tong Man
Perry Jarmuszewski
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BlackBerry Ltd
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BlackBerry Ltd
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Filing date
Publication date
Application filed by BlackBerry Ltd filed Critical BlackBerry Ltd
Priority to EP07105873.9A priority Critical patent/EP1981119B1/fr
Priority to CNA2008101003497A priority patent/CN101281993A/zh
Priority to CA2625434A priority patent/CA2625434C/fr
Publication of EP1981119A1 publication Critical patent/EP1981119A1/fr
Application granted granted Critical
Publication of EP1981119B1 publication Critical patent/EP1981119B1/fr
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    • 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
    • H01Q1/245—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 means for shaping the antenna pattern, e.g. in order to protect user against rf exposure

Definitions

  • the present invention relates to the field of communications devices, and, more particularly, to mobile wireless communications devices and related methods.
  • Cellular communications systems continue to grow in popularity and have become an integral part of both personal and business communications.
  • Cellular telephones allow users to place and receive voice calls most anywhere they travel.
  • PDA personal digital assistant
  • many cellular devices now incorporate personal digital assistant (PDA) features such as calendars, address books, task lists, etc.
  • PDA personal digital assistant
  • multi-function devices may also allow users to wirelessly send and receive electronic mail (email) messages and access the Internet via a cellular network and/or a wireless local area network (WLAN), for example.
  • WLAN wireless local area network
  • WO03026064 discloses a handset comprising an antenna completely covered by a shield in order to improve the SAR of the handset.
  • One exemplary antenna system for a flip style cellular phone is described in U.S. Patent No. 6,765,536 .
  • the antenna system includes an external antenna element carried on the top of the lower housing, and a parasitic element carried by the top housing so that when the phone is flipped open the parasitic element is in close proximity to the antenna element.
  • a tuning circuit carried by the lower housing is electrically coupled to the parasitic element. The tuning circuit is variable to adjust the parasitic load on the antenna element to provide variable operating frequencies and bandwidths for the phone.
  • External cell phone antennas are advantageous in that they are spaced apart from the user's head, which makes it easier for phone manufacturers to comply with applicable specific absorption rate (SAR) requirements, for example. This is because the farther the radiating element of the cell phone antenna system is from the user, the less intense the radiation exposure to the user. Yet, many users prefer internal antennas over external antennas, as external antennas are prone to catch on objects and become damaged, for example. However, with the ever increasing trend towards smaller cell phone sizes, for a relatively small phone having an internal antenna, this may place the antenna in relatively close proximity to the user's ear, which may make complying with applicable SAR and/or hearing aid compatibility (HAC) requirements potentially difficult for manufacturers. This is especially true for smaller and thinner "candy bar" style phones.
  • SAR absorption rate
  • FIG. 1 is a schematic cross-sectional diagram of a mobile wireless communications device including a ground patch in accordance with one embodiment adjacent a user's ear.
  • FIG. 2 is a schematic block diagram of the dielectric substrate and ground patch of FIG. 1 .
  • FIG. 3 is a schematic block diagram of an alternative example of the mobile wireless communications device of FIG. 1 in which the ground patch is carried on the exterior of the device housing.
  • FIG. 4 is a schematic block diagram illustrating further exemplary components that may be used in the mobile wireless communications device of FIG. 1 .
  • a mobile wireless communications device which includes a portable housing, a dielectric substrate carried by the portable housing having a front side facing toward a user and a back side opposite the front side, and a ground plane carried by the dielectric substrate.
  • the device further includes at least one circuit carried by the dielectric substrate, and an antenna carried by the dielectric substrate adjacent an end thereof and electrically connected to the at least one circuit.
  • a ground patch is adjacent the front side of the dielectric substrate that is electrically connected to the ground plane and spaced apart from and partially overlapping the antenna.
  • the ground patch advantageously reduces a specific absorption rate (SAR) associated with the device by shielding the user from electromagnetic (EM) radiation generated by the antenna in the direction of the user's head. Moreover, this may also advantageously provide desired hearing aid compatibility (HAC).
  • SAR specific absorption rate
  • EM electromagnetic
  • the ground plane is on the back side of the dielectric substrate.
  • the ground patch may be carried by the dielectric substrate.
  • the ground patch has an L-shape comprising a first member extending outwardly from the dielectric substrate, and a second member extending outwardly from the first member in a direction generally parallel to the dielectric substrate. More specifically, the second member only partially overlaps the antenna.
  • the ground patch may be carried by the portable housing, for example.
  • the ground patch is connected to the ground plane at a plurality of spaced apart contact points.
  • the dielectric substrate may have a lower end and an upper end, and the antenna may be carried adjacent the lower end of the dielectric substrate.
  • the at least one circuit may be a wireless transceiver, such as a cellular transceiver, for example.
  • the mobile wireless communications device may further include at least one of a display and a keypad carried by the dielectric substrate on the front surface thereof.
  • the device 20 illustratively includes a portable housing 21 and a dielectric substrate 22, such as a printed circuit board (PCB), carried by the portable housing.
  • the dielectric substrate 22 has a front side facing toward a user 23 when the device 20 is placed adjacent the user's ear 24 to engage in a telephone conversation, and a back side opposite the front side.
  • the device 20 further illustratively includes a display 35 (e.g., a liquid crystal display (LCD)) and a keypad 36 carried by the dielectric substrate 22 on the front surface thereof.
  • a display 35 e.g., a liquid crystal display (LCD)
  • keypad 36 carried by the dielectric substrate 22 on the front surface thereof.
  • a ground plane 25 is carried by the dielectric substrate 22, which in the illustrated embodiment is on the back side thereof.
  • the device 20 further illustratively includes a circuit(s) 26 carried by the dielectric substrate 22, such a wireless cellular transceiver, for example.
  • a circuit(s) 26 carried by the dielectric substrate 22, such a wireless cellular transceiver, for example.
  • An antenna 27 is also carried by the dielectric substrate 22 adjacent an end thereof and electrically connected to the circuit 26 at a contact point 30.
  • the antenna 27 may include one or more conductive traces (e.g., printed circuit traces) on the dielectric substrate 22.
  • additional risers or antenna retainer frames may be used to increase the surface area of the antenna, as well as wrapping of conductive traces around different sides/ends of the dielectric substrate 22, as will be appreciated by those skilled in the art.
  • the antenna 27 is adjacent the lower end of the substrate (i.e., where the microphone (not shown) of the cellular device would typically be located).
  • the antenna 27 could be positioned adjacent the upper end of the dielectric substrate 22. Positioning the antenna 27 adjacent the bottom of the device 20 may advantageously help achieve a relatively wide bandwidth and relatively high antenna gain. However, this may also result in a more omni-directional antenna radiation pattern, which in turn can increase the SAR of the device 20 as more radiation is directed toward the user 23 than would be the case with a directional antenna having a boresight pointed away from the user, as will be appreciated by those skilled in the art.
  • a ground patch 31 is advantageously positioned adjacent the front side of the dielectric substrate 22 and spaced apart from and partially overlapping the antenna 27.
  • the ground patch 31 is electrically connected to the ground plane 25. More particularly, in the illustrated embodiment electrical contact occurs at a plurality of spaced-apart contact points 32 on the dielectric substrate 22, which are connected to the ground plane 25 by respective vias 33. It should be noted, however, that different electrical connection arrangements may be used in different examples, including one or more contact points and wrap-around connections instead of vias passing through the dielectric substrate 22, for example.
  • the ground plane 25 may be located on the same side of the dielectric substrate 22 as the ground patch 31. It should be noted that the ground patch 31 is shown with hatching in FIG. 2 for clarity of illustration, although this element is not being shown in section.
  • the ground patch 31 advantageously reduces a specific absorption rate (SAR) associated with the device 20 by shielding the user from electromagnetic (EM) radiation generated by the antenna in the direction of the user's head. Moreover, this may also advantageously provide desired hearing aid compatibility (HAC), as will be appreciated by those skilled in the art.
  • SAR specific absorption rate
  • EM electromagnetic
  • HAC hearing aid compatibility
  • the ground patch 31 is illustratively carried by the dielectric substrate 22 and has an L-shape comprising a first member 37 extending outwardly from the dielectric substrate, and a second member 38 extending outwardly from the first member in a direction generally parallel to the dielectric substrate (see FIG. 1 ). More specifically, the second member 38 only partially overlaps the antenna, as shown in FIGS. 1 and 2 .
  • a height of the antenna 27 may preferably be about 15 mm or less, and a length of the second member 38 may be from about 1 to 15 mm.
  • the height of the first member 37 may typically be about 1 to 5 mm, although other dimensions may also be used.
  • FIG. 3 an alternative example of the device 20' is shown in which the ground patch 31' is carried by the portable housing 21'. More particularly, in the illustrated example the ground patch 31' is carried on the outside or exterior of the housing 21'.
  • the ground patch 31' could have a stylistic appearance.
  • the ground patch 31' could be a piece of metal with a trade name or logo of the device manufacturer or network provider printed or engraved thereon.
  • the ground patch 31' could be carried on the inside or interior of the housing 21', e.g., carried on an interior surface of the housing.
  • the device 1000 illustratively includes a housing 1200, a keypad 1400 and an output device 1600.
  • the output device shown is a display 1600, which is preferably a full graphic LCD. Other types of output devices may alternatively be utilized.
  • a processing device 1800 is contained within the housing 1200 and is coupled between the keypad 1400 and the display 1600. The processing device 1800 controls the operation of the display 1600, as well as the overall operation of the mobile device 1000, in response to actuation of keys on the keypad 1400 by the user.
  • the housing 1200 may be elongated vertically, or may take on other sizes and shapes (including clamshell housing structures).
  • the keypad may include a mode selection key, or other hardware or software for switching between text entry and telephony entry.
  • FIG. 4 In addition to the processing device 1800, other parts of the mobile device 1000 are shown schematically in FIG. 4 . These include a communications subsystem 1001; a short-range communications subsystem 1020; the keypad 1400 and the display 1600, along with other input/output devices 1060, 1080, 1100 and 1120; as well as memory devices 1160, 1180 and various other device subsystems 1201.
  • the mobile device 1000 is preferably a two-way RF communications device having voice and data communications capabilities.
  • the mobile device 1000 preferably has the capability to communicate with other computer systems via the Internet.
  • Operating system software executed by the processing device 1800 is preferably stored in a persistent store, such as the flash memory 1160, but may be stored in other types of memory devices, such as a read only memory (ROM) or similar storage element.
  • system software, specific device applications, or parts thereof may be temporarily loaded into a volatile store, such as the random access memory (RAM) 1180. Communications signals received by the mobile device may also be stored in the RAM 1180.
  • the processing device 1800 in addition to its operating system functions, enables execution of software applications 1300A-1300N on the device 1000.
  • a predetermined set of applications that control basic device operations, such as data and voice communications 1300A and 1300B, may be installed on the device 1000 during manufacture.
  • a personal information manager (PIM) application may be installed during manufacture.
  • the PIM is preferably capable of organizing and managing data items, such as e-mail, calendar events, voice mails, appointments, and task items.
  • the PIM application is also preferably capable of sending and receiving data items via a wireless network 1401.
  • the PIM data items are seamlessly integrated, synchronized and updated via the wireless network 1401 with the device user's corresponding data items stored or associated with a host computer system.
  • the communications subsystem 1001 includes a receiver 1500, a transmitter 1520, and one or more antennas 1540 and 1560.
  • the communications subsystem 1001 also includes a processing module, such as a digital signal processor (DSP) 1580, and local oscillators (LOs) 1601.
  • DSP digital signal processor
  • LOs local oscillators
  • a mobile device 1000 may include a communications subsystem 1001 designed to operate with the MobitexTM, Data TACTM or General Packet Radio Service (GPRS) mobile data communications networks, and also designed to operate with any of a variety of voice communications networks, such as AMPS, TDMA, CDMA, WCDMA, PCS, GSM, EDGE, etc. Other types of data and voice networks, both separate and integrated, may also be utilized with the mobile device 1000.
  • the mobile device 1000 may also be compliant with other communications standards such as 3GSM, 3GPP, UMTS, etc.
  • Network access requirements vary depending upon the type of communication system. For example, in the Mobitex and DataTAC networks, mobile devices are registered on the network using a unique personal identification number or PIN associated with each device. In GPRS networks, however, network access is associated with a subscriber or user of a device. A GPRS device therefore requires a subscriber identity module, commonly referred to as a SIM card, in order to operate on a GPRS network.
  • SIM card subscriber identity module
  • the mobile device 1000 may send and receive communications signals over the communication network 1401.
  • Signals received from the communications network 1401 by the antenna 1540 are routed to the receiver 1500, which provides for signal amplification, frequency down conversion, filtering, channel selection, etc., and may also provide analog to digital conversion. Analog-to-digital conversion of the received signal allows the DSP 1580 to perform more complex communications functions, such as demodulation and decoding.
  • signals to be transmitted to the network 1401 are processed (e.g. modulated and encoded) by the DSP 1580 and are then provided to the transmitter 1520 for digital to analog conversion, frequency up conversion, filtering, amplification and transmission to the communication network 1401 (or networks) via the antenna 1560.
  • the DSP 1580 provides for control of the receiver 1500 and the transmitter 1520. For example, gains applied to communications signals in the receiver 1500 and transmitter 1520 may be adaptively controlled through automatic gain control algorithms implemented in the DSP 1580.
  • a received signal such as a text message or web page download
  • the communications subsystem 1001 is input to the processing device 1800.
  • the received signal is then further processed by the processing device 1800 for an output to the display 1600, or alternatively to some other auxiliary I/O device 1060.
  • a device user may also compose data items, such as e-mail messages, using the keypad 1400 and/or some other auxiliary I/O device 1060, such as a touchpad, a rocker switch, a thumb-wheel, or some other type of input device.
  • the composed data items may then be transmitted over the communications network 1401 via the communications subsystem 1001.
  • a voice communications mode In a voice communications mode, overall operation of the device is substantially similar to the data communications mode, except that received signals are output to a speaker 1100, and signals for transmission are generated by a microphone 1120.
  • Alternative voice or audio I/O subsystems such as a voice message recording subsystem, may also be implemented on the device 1000.
  • the display 1600 may also be utilized in voice communications mode, for example to display the identity of a calling party, the duration of a voice call, or other voice call related information.
  • the short-range communications subsystem enables communication between the mobile device 1000 and other proximate systems or devices, which need not necessarily be similar devices.
  • the short-range communications subsystem may include an infrared device and associated circuits and components, or a BluetoothTM communications module to provide for communication with similarly-enabled systems and devices.

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Support Of Aerials (AREA)
  • Telephone Set Structure (AREA)
  • Transceivers (AREA)

Claims (9)

  1. Dispositif de communication sans fil mobile (20) comprenant :
    un boîtier portable (21) ;
    un substrat diélectrique (22) porté par ledit boîtier portable (21) ayant un côté avant et un côté arrière opposé au côté avant ;
    un plan de masse (25) porté par ledit substrat diélectrique (22) ;
    au moins un circuit (26) porté par ledit substrat diélectrique (22) ;
    une antenne (27) portée par ledit substrat diélectrique (22) de manière adjacente à une extrémité de celui-ci et reliée électriquement audit au moins un circuit (26) ; et
    une plaque de masse (31) adjacente au côté avant dudit substrat diélectrique (22) qui est reliée électriquement audit plan de masse (25) et qui est espacée de ladite antenne (27), ladite plaque de masse (31) ayant une forme en L comprenant un premier élément (37) s'étendant vers l'extérieur depuis ledit substrat diélectrique (22) et un second élément (38) définissant une surface continue et s'étendant vers l'extérieur depuis ledit premier élément (37) dans une direction généralement parallèle audit substrat diélectrique (22) ;
    dans lequel ladite plaque de masse (31) est reliée audit plan de masse (25) au niveau d'une pluralité de points de contact espacés (32) par des trous traversants respectifs (33) ;
    dans lequel ledit plan de masse (25) est sur le côté arrière dudit substrat diélectrique (22) ; et
    dans lequel ledit second élément (38) chevauche uniquement partiellement ladite antenne (27).
  2. Dispositif de communication sans fil mobile (20) selon la revendication 1, dans lequel ladite plaque de masse (31) est portée par ledit substrat diélectrique (22).
  3. Dispositif de communication sans fil mobile (20) selon la revendication 1, dans lequel ledit substrat diélectrique (22) a une extrémité inférieure et une extrémité supérieure, et dans lequel ladite antenne (27) est portée de manière adjacente à l'extrémité inférieure dudit substrat diélectrique (22).
  4. Dispositif de communication sans fil mobile (20) selon la revendication 1, dans lequel ledit au moins un circuit (26) comprend un émetteur-récepteur sans fil.
  5. Dispositif de communication sans fil mobile (20) selon la revendication 4, dans lequel ledit émetteur-récepteur sans fil comprend un émetteur-récepteur cellulaire.
  6. Dispositif de communication sans fil mobile (20) selon la revendication 1, comprenant en outre au moins l'un parmi un dispositif d'affichage (35) et un clavier (36) porté par ledit substrat diélectrique (22) sur la surface avant de celui-ci.
  7. Procédé de réduction d'un taux d'absorption spécifique (SAR) d'un dispositif de communication sans fil mobile (20) comprenant un boîtier portable (21), un substrat diélectrique (22) porté par le boîtier portable (21) ayant un côté avant et un côté arrière opposé au côté avant, un plan de masse (25) porté par le substrat diélectrique (22), au moins un circuit (26) porté par le substrat diélectrique (22), une antenne (27) portée par le substrat diélectrique (22) de manière adjacente à une extrémité de celui-ci et reliée électriquement à l'au moins un circuit (26), et une plaque de masse, le procédé comprenant :
    positionner la plaque de masse (31) de manière adjacente au côté avant du substrat diélectrique (22) espacée de l'antenne (27) et connecter électriquement la plaque de masse (31) au plan de masse (25) ;
    la plaque de masse (31) ayant une forme en L comprenant un premier élément (37) s'étendant vers l'extérieur à partir du substrat diélectrique (22) et un second élément (38) définissant une surface continue et s'étendant vers l'extérieur à partir du premier élément (37) dans une direction généralement parallèle au substrat diélectrique (22) ;
    dans lequel la connexion électrique de la plaque de masse (31) au plan de masse (25) comprend la connexion électrique de la plaque de masse (31) au plan de masse (25) au niveau d'une pluralité de points de contact espacés (32) par des trous traversants respectifs (33) ;
    dans lequel le plan de masse (25) est sur le côté arrière du substrat diélectrique (22) ; et
    dans lequel le second élément (38) chevauche uniquement partiellement l'antenne (27).
  8. Procédé selon la revendication 7, dans lequel le positionnement de la plaque de masse (31) comprend le montage de la plaque de masse (31) sur le substrat diélectrique (22).
  9. Procédé selon la revendication 7, dans lequel le substrat diélectrique (22) a une extrémité inférieure et une extrémité supérieure, et dans lequel l'antenne (27) est portée de manière adjacente à l'extrémité inférieure du substrat diélectrique (22).
EP07105873.9A 2007-04-10 2007-04-10 Dispositif mobile de communication sans fil incluant une plaque connectée à la masse fournissant une réduction du taux d'absorption spécifique (SAT) et procédés correspondants Active EP1981119B1 (fr)

Priority Applications (3)

Application Number Priority Date Filing Date Title
EP07105873.9A EP1981119B1 (fr) 2007-04-10 2007-04-10 Dispositif mobile de communication sans fil incluant une plaque connectée à la masse fournissant une réduction du taux d'absorption spécifique (SAT) et procédés correspondants
CNA2008101003497A CN101281993A (zh) 2007-04-10 2008-04-03 包括接地贴片的移动无线通信设备及相关方法
CA2625434A CA2625434C (fr) 2007-04-10 2008-04-09 Appareil de communication mobile sans fil comprenant une connexion electrique assurant la reduction du taux d'absorption specifique et methodes connexes

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP07105873.9A EP1981119B1 (fr) 2007-04-10 2007-04-10 Dispositif mobile de communication sans fil incluant une plaque connectée à la masse fournissant une réduction du taux d'absorption spécifique (SAT) et procédés correspondants

Publications (2)

Publication Number Publication Date
EP1981119A1 EP1981119A1 (fr) 2008-10-15
EP1981119B1 true EP1981119B1 (fr) 2019-12-18

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Publication number Priority date Publication date Assignee Title
CN101990009B (zh) * 2009-07-30 2014-07-23 宏达国际电子股份有限公司 移动装置

Citations (1)

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WO2003026064A1 (fr) * 2001-09-13 2003-03-27 Koninklijke Philips Electronics N.V. Terminal sans fil

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FR2699773A1 (fr) * 1992-12-17 1994-06-24 Alsthom Cge Alcatel Emetteur radio portable.
JP3838815B2 (ja) * 1999-05-10 2006-10-25 日本電気株式会社 携帯電話機
DE60201878T2 (de) * 2002-01-28 2005-03-17 Sony International (Europe) Gmbh Mobilfunkgerät mit geerdetem Strahlungsabschirmungsrahmen
US6765536B2 (en) 2002-05-09 2004-07-20 Motorola, Inc. Antenna with variably tuned parasitic element
GB2390957B (en) * 2002-07-15 2005-11-23 * Motorola, Inc System for enhanced radiation performance of a communication device
KR100625121B1 (ko) * 2003-07-01 2006-09-19 에스케이 텔레콤주식회사 통신핸드셋 장치에서의 ｓａｒ 노출 감소 방법 및 장치
EP1808929B1 (fr) * 2006-01-13 2009-09-09 Research In Motion Limited Appareil de communication mobile sans fil avec un directeur électroconducteur et méthode correspondante

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WO2003026064A1 (fr) * 2001-09-13 2003-03-27 Koninklijke Philips Electronics N.V. Terminal sans fil

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CN101281993A (zh) 2008-10-08
EP1981119A1 (fr) 2008-10-15
CA2625434C (fr) 2010-01-26
CA2625434A1 (fr) 2008-06-24

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