EP2182580A1 - Méthode pour recevoir des signaux radiofréquences grace à la masse du boîtier d'un dispositif de communication mobile. - Google Patents

Méthode pour recevoir des signaux radiofréquences grace à la masse du boîtier d'un dispositif de communication mobile. Download PDF

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Publication number
EP2182580A1
EP2182580A1 EP08168223A EP08168223A EP2182580A1 EP 2182580 A1 EP2182580 A1 EP 2182580A1 EP 08168223 A EP08168223 A EP 08168223A EP 08168223 A EP08168223 A EP 08168223A EP 2182580 A1 EP2182580 A1 EP 2182580A1
Authority
EP
European Patent Office
Prior art keywords
antenna
card
pcb
delay line
mobile communications
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Withdrawn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
EP08168223A
Other languages
German (de)
English (en)
Inventor
Risto Savolainen
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.)
Bluesky Positioning IPCO SARL
Original Assignee
Bluesky Positioning IPCO SARL
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 Bluesky Positioning IPCO SARL filed Critical Bluesky Positioning IPCO SARL
Priority to EP08168223A priority Critical patent/EP2182580A1/fr
Priority to PCT/EP2009/064105 priority patent/WO2010060707A1/fr
Publication of EP2182580A1 publication Critical patent/EP2182580A1/fr
Withdrawn legal-status Critical Current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
    • H01Q1/44—Details of, or arrangements associated with, antennas using equipment having another main function to serve additionally as an antenna, e.g. means for giving an antenna an aesthetic aspect
    • 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 generally to mobile communications devices such as GSM (global system for mobile communications) and 3G (UMTS) portable telephone sets including a subscriber identity module (SIM), and more particularly to those subscriber identity modules that also embed a positioning system transceiver aimed at decoding the signals transmitted by space vehicles.
  • GSM global system for mobile communications
  • UMTS 3G
  • SIM subscriber identity module
  • the location-based services considered by the wireless communications industry typically include the E-112 emergency services legislation in European Union and E-911 in the USA, with strict requirements for the accuracy of the caller's location.
  • Network operators are required to identify the location of the callers with an accuracy level of just a few tens of meters in rural areas, i.e. between one and two order of magnitude better than what a GSM network is able to achieve.
  • the new law is designed to improve emergency services reaction and response time to provide assistance to persons in danger. Because emergency calls are more and more frequently originated from mobile phone devices it will be eventually mandatory to include a very precise positioning system in all wireless communications devices carried by individuals.
  • the front-end part of the reception system i.e. the antenna and its coupling to the receiver must be particularly efficient to obtain signal to noise ratios that are exploitable in spite of all the physical constraints induced by a tight packaging while supplementary constraints like power consumption and cost of fabrication are also critical for mobile devices that are powered from a small battery and are produced for a large and extremely competitive market place.
  • the coupling system comprises a main coupling leg implemented as a galvanic connection between the PCB card and the antenna.
  • a reference capacitive coupling leg is also formed between a ground plane of the PCB card and the antenna.
  • An auxiliary capacitive coupling leg is further formed between a conductive area of the PCB card and the antenna.
  • the coupling system includes a delay line arranged to introduce a phase shift of the signal captured through the auxiliary capacitive coupling leg. The system is arranged so that the RF receiver is provided with the signal captured by the galvanic main coupling leg and with the phase shifted signal delivered by the delay line.
  • the coupling system allows a RF receiver in the subscriber identity module of a mobile communications device system to receive the signals transmitted for instance by the space vehicles of a global positioning system through the mobile device used as an antenna.
  • the coupling system of the invention may optionally comprise any one of the following features:
  • the invention further provides a mobile communications device comprising the coupling system according to any one of the preceding features.
  • the invention preferably re-uses and adapts existing standard components for housing the circuitry needed.
  • the invention manages to use the standard removable subscriber identification module (SIM) card or equivalent identification card 12, which equips many mobile portable handsets, to also house the receiver circuitry along with the processing and computational resources needed to receive and decode the signals transmitted by the space vehicles of the global positioning system.
  • SIM subscriber identification module
  • the SIM or equivalent card is then a small printed circuit board (PCB) card used to hold specialized electronic components with their wiring and connecting lands.
  • PCB printed circuit board
  • the invention considers that the conductive chassis 10 of the handset can be used as an antenna for receiving the signals provided an appropriate coupling between the chassis and the receiver located on the SIM card can be achieved as described hereafter.
  • the chassis comprises any electrically conductive part, usually metallic, that has a galvanic connection to the phone ground.
  • the chassis of the invention may, additionally to the chassis frame of the handset, notably includes the main printed circuit board, battery, embedded accessory or phone body part
  • the PCB ground can be used as an antenna.
  • Figure 1 shows the overall structure and principle of the coupling between the ground chassis 10 of a portable handset 30 used as an antenna and the GPS receiver 20 situated on the SIM card 12.
  • the receiver ground of the SIM card 3 is also coupled with the mobile device chassis 10, making it difficult to extract the signal to the transceiver input.
  • couplers necessarily lay very close one to each other, typically within few millimeters. The signals fed by the couplers are then very similar in terms of phase or time difference.
  • the invention uses three coupling elements:
  • a differential amplifier 21 as a part of the radio frequency (RF) front end circuitry of the receiver 20 which, if connected directly to the main and auxiliary couplers 1, 2, would however provide a very low output, due to the lack of phase difference existing between the physically close coupling points. Because there is no space available to move farther away the two couplers so that the resulting phase difference would become higher (ideally the phases should be exactly opposite) the invention introduces instead an electrical phase shift (or delay) between the coupling points.
  • the invention manages to use the phase shifter 4 to create a virtual distance between the main galvanic coupler 1 and the auxiliary coupler 2.
  • Figure 2 depicts an exemplary implementation of a coupling system according the invention between the chassis antenna of a portable handset and the GPS receiving circuitry situated on the SIM card 12.
  • the main galvanic connection 1 is done here through one of the six or eight standardized connecting pads of the SIM card, for example contact 5 of ISO 7816 standard.
  • the auxiliary capacitive coupler 2 is a conductive area which is shown in the middle of the standard contacts.
  • the delay line is implemented in the form of a transmission line 4 which connects the auxiliary coupler to one of the input of the differential amplifier 21 of the receiver circuitry 20 while the other one is tied to the galvanic connection 1.
  • the delay can be obtained with a trimmable passive device made of discrete inductors and capacitors or with a specialized active component capable of providing an adjustable delay.
  • the length of the delay line 4 is adjusted to tune the signal phase shift taking into account the characteristics of the couplers for the input signal frequency (1.57542 GHz in the case of a GPS application) and to minimize the losses.
  • the objective is to have two signals with a relative phase shift as close to 180° as possible 22.
  • the benefit is not only an increase in the antenna gain, but also a better shape in the radiation diagram due to a more homogeneous current distribution on the chassis.
  • the resulting system has a low sensitivity to capacity variations typically resulting from different SIM card distances over the chassis, or different materials in between the SIM card and the chassis. This is because of the capacity variation being partially compensated by the capacitive connection of the reference coupler (receiver ground plane in the SIM Card) to the mobile device chassis.
  • the reference coupler receiveriver ground plane in the SIM Card
  • Figure 3 shows a variant of the coupling circuitry in which an inductor 25 is inserted between the auxiliary coupler 2 and the delay line 4 to improve the transmission of the signal captured by the coupler.
  • the relatively large value of the coupling capacitor 18, which tends to attenuate the captured signal, can thus be compensated by the inductor in forming a LC circuit which is tuned to have minimum impedance at the operating frequency of the device. This embodiment improves therefore the performances of the system.

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Transceivers (AREA)
  • Telephone Set Structure (AREA)
EP08168223A 2008-11-03 2008-11-03 Méthode pour recevoir des signaux radiofréquences grace à la masse du boîtier d'un dispositif de communication mobile. Withdrawn EP2182580A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
EP08168223A EP2182580A1 (fr) 2008-11-03 2008-11-03 Méthode pour recevoir des signaux radiofréquences grace à la masse du boîtier d'un dispositif de communication mobile.
PCT/EP2009/064105 WO2010060707A1 (fr) 2008-11-03 2009-10-27 Procédé de réception de signaux rf par l'intermédiaire du châssis servant de terre d'un dispositif mobile de communication

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP08168223A EP2182580A1 (fr) 2008-11-03 2008-11-03 Méthode pour recevoir des signaux radiofréquences grace à la masse du boîtier d'un dispositif de communication mobile.

Publications (1)

Publication Number Publication Date
EP2182580A1 true EP2182580A1 (fr) 2010-05-05

Family

ID=40427869

Family Applications (1)

Application Number Title Priority Date Filing Date
EP08168223A Withdrawn EP2182580A1 (fr) 2008-11-03 2008-11-03 Méthode pour recevoir des signaux radiofréquences grace à la masse du boîtier d'un dispositif de communication mobile.

Country Status (2)

Country Link
EP (1) EP2182580A1 (fr)
WO (1) WO2010060707A1 (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR102410706B1 (ko) * 2015-07-28 2022-06-20 삼성전자주식회사 안테나 장치 및 그것을 포함하는 전자 장치

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5940045A (en) * 1996-12-30 1999-08-17 Harris Corporation Optimization of DC power to effective irradiated power conversion efficiency for helical antenna
EP1267441A2 (fr) * 2001-06-15 2002-12-18 Hitachi Metals, Ltd. Antenne montable en surface et appareil de communication utilisant celle-ci
EP1777781A1 (fr) 2005-10-19 2007-04-25 Risto Kalevi Savolainen Dispositif d'antenne
US20070252764A1 (en) * 2006-04-26 2007-11-01 Nokia Corporation Antenna

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5940045A (en) * 1996-12-30 1999-08-17 Harris Corporation Optimization of DC power to effective irradiated power conversion efficiency for helical antenna
EP1267441A2 (fr) * 2001-06-15 2002-12-18 Hitachi Metals, Ltd. Antenne montable en surface et appareil de communication utilisant celle-ci
EP1777781A1 (fr) 2005-10-19 2007-04-25 Risto Kalevi Savolainen Dispositif d'antenne
US20070252764A1 (en) * 2006-04-26 2007-11-01 Nokia Corporation Antenna

Also Published As

Publication number Publication date
WO2010060707A1 (fr) 2010-06-03

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