WO2005109570A1 - Dispositif radio portable - Google Patents

Dispositif radio portable Download PDF

Info

Publication number
WO2005109570A1
WO2005109570A1 PCT/EP2004/005041 EP2004005041W WO2005109570A1 WO 2005109570 A1 WO2005109570 A1 WO 2005109570A1 EP 2004005041 W EP2004005041 W EP 2004005041W WO 2005109570 A1 WO2005109570 A1 WO 2005109570A1
Authority
WO
WIPO (PCT)
Prior art keywords
radiation patch
portable radio
radio device
ground plane
electromagnetic signal
Prior art date
Application number
PCT/EP2004/005041
Other languages
English (en)
Inventor
Ole Jagielski
Arne Bisgaard Kristensen
Original Assignee
Benq Mobile Gmbh & Co. Ohg
Benq Corporation
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 Benq Mobile Gmbh & Co. Ohg, Benq Corporation filed Critical Benq Mobile Gmbh & Co. Ohg
Priority to PCT/EP2004/005041 priority Critical patent/WO2005109570A1/fr
Publication of WO2005109570A1 publication Critical patent/WO2005109570A1/fr

Links

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
    • 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

  • a portable radio device A portable radio device
  • the invention relates to portable radio devices for receiving or transmitting a microwave signal. More specifically, the invention relates to radiation patches used in microwave antennas .
  • Planar inverted F antennas have been used for wireless communication because they have a relatively simple structure, they are easy to manufacture and the production cost is rather low.
  • a problem of the planar inverted F antenna is that it has a narrow frequency bandwidth.
  • WO 2004/021514 shows a planar inverted F antenna.
  • the planar inverted F antenna is a modified microstrip antenna having a shape of F.
  • the radiation patch of the '514 publication has a shape of a linearly-tapered rectangle in order to improve the bandwidth characteristics of the antenna.
  • the bandwidth of such an antenna may be large enough for a dual-band portable radio device, but when coverage of four bands is needed, its performance would not be sufficient.
  • US 6,408,190 Bl shows a printed multi-band patch antenna. Two separate patches are each divided to two sub-parts. The slot between the sub-parts is used to increase bandwidth. The designers of '190 antenna claim their antenna to show good performance on three bands. Such a construction, ie dividing the patches to sub-parts by etching, cutting or metallizing (3D) the slot for the patch is nevertheless rather complex.
  • An objective of the invention is to bring about a portable radio device that enables radio communications over an extended bandwidth with one antenna only. This objective can be achieved as set out in the independent claim.
  • the dependent claims describe various advantageous embodiments of the invention.
  • the radiation patch of a portable radio device is placed above the ground plane from which it is electrically isolated except a connection through the feed line, and if said radiation patch further has a shape that leaves a uniform part of the ground plane uncovered between a first part of the radiation patch and a second part of the radiation patch, increasing current energy distribution in between the first and second parts of the radiation patch can be avoided.
  • This is advantageous because the impedance of the antenna can be kept lower. A high current energy distribution in a middle part of the ground plane has in practice only little contribution to the radiated power.
  • the bandwidth of the antenna is not decreased. As a result, it becomes then relatively easy to make the matching of the antenna impedance .
  • Especially suitable forms for the radiation patch are forms that substantially resemble C, U, or ⁇ , or a cut- leg C, U, or ⁇ .
  • These shapes enable particularly easy manufacture of the ground plane that may be a Printed Circuit Board PCB so that the shape of the ground plane then can follow the periphery of the radiation patch.
  • the portable radio device further comprises a strip of conductive material substantially following the inner periphery of the radiation patch, the strip of conductive material will act as a parasitic element thereby increasing the antenna bandwidth.
  • the volume of the antenna can be made large enough in order to ensure proper radiation characteristics for the antenna for some frequency bands, even though the physical size of the radiation patch would have a total area of under 4 cm 2 .
  • a free end of the first part of the radiation patch or a free end of the second part of the radiation patch is bent towards the ground plane, the area that the radiation patch occupies can be reduced, if the resulting bandwidth allows.
  • a free end of the first part of the radiation patch can be bent towards the second part of the radiation patch, or the free end of the second part of the radiation patch can be bent towards the first part of the radiation patch.
  • the portable radio device comprises i) means for selecting a frequency band of four different cellular network frequency bands; and iia) means adapted to generate an electromagnetic signal to be fed to the feed line, the electromagnetic signal having a form belonging to a channel of the cellular network frequency band selected; or iib) means adapted to receive an electromagnetic signal from the feed line, the electromagnetic signal having a form belonging to a channel of the cellular network frequency band selected, the resulting portable radio device will be operable at least on four-bands while still comprising one antenna only.
  • An example of the four bands is GSM 850 Mhz, GSM 900 Mhz, GSM 1800 Mhz, and GSM 1900 Mhz.
  • Figure 1A is a perspective view of a portable radio device, the cover of which has been removed;
  • Figure IB shows a radiation patch according to the invention
  • Figure IC is a back cover with the radiation patch placed inside
  • Figure ID is a top view of a portable radio device of Figure 1A;
  • Figure 2 is a perspective view of a similar portable radio device than that in Figure 1A, further comprising a strip of conductive material substantially following the inner periphery of the radiation patch;
  • Figures 3A to 3D show Smitch charts for the portable radio device at different cellular frequency bands
  • Figures 4A to 4D show Voltage-to-Standing Wave Ratio charts for the portable radio device at different cellular frequency bands.
  • FIG. 5 is a block diagram showing a portable radio device used for communication in four frequency bands. Detailed description
  • Figure 1A is a perspective view of a portable radio device 10, the cover of which has been removed. Inside the portable radio device 10, radiation patch 103 has been assembled onto ground plane 101. As ground plane 101 usually a Printed
  • Circuit Board PCB is used. A part of the periphery PG of the ground plane 101 has been marked with the dashed box B101.
  • the distance ⁇ between the radiation patch 103 and the ground plane 101 may vary.
  • the portable radio device 10 is to be used for radio communication on frequency bands covering some 800-900 MHz and 1800-1900 MHz, and when the area of radiation patch 103 is about 4 cm 2 , the distance ⁇ would preferably be 8-9 mm.
  • the feed line 105 is preferably placed in or close to the corner of the ground plane 101 since in this way the distance between opposite corners of the ground plane 101 is at maximum.
  • the a feed line 105 is connected to the radiation patch 103 for feeding an electromagnetic signal to the radiation patch 103 or for receiving an electromagnetic signal from the radiation patch 103.
  • the feed line 105 is connected to a receiver and/or transmitter circuitry of the portable radio device 10, which are not illustrated in Figure 1A for the sake of clarity.
  • the receiver and/or transmitter circuitry can be implemented using components assembled onto the PCB.
  • the feed line 105 is preferably connected to a corner of the radiation patch 103 or very close to it. This kind of construction enables that the radiation patch 103 substantially follows the boundary of the ground plane 101.
  • the feed line 105 or the transmitter circuitry is adapted not to feed any signal to the radiation patch 103 but to the antenna connector 107.
  • the receiver circuitry which is adapted not to receive any signal from the radiation patch 103 but from the antenna connector 107.
  • the rechargeable battery 109 of the portable radio device 10 is located on the PCB away from the radiation patch 103.
  • the radiation patch 103 is placed above the ground plane 101 from which it is electrically isolated except a connection through the feed line 105 and via the transmitter or receiver circuitry.
  • Figure IB shows the radiation patch 103 of Figure 1A.
  • Said radiation patch 103 has a shape that leaves a uniform part of the ground plane 101 uncovered between a first part LA of the radiation patch 103 and a second part RA of the radiation patch 103.
  • the first part LA is the left arm and the second part RA is the right arm of the radiation patch 103, or vice versa.
  • the form of the radiation patch 103 may substantially resemble the shape of a C, U, or II , or of a cut-leg C, U, or IT .
  • the outer periphery OP is the longer outer side, whereas the inner periphery IP is the inner side of the radiation patch 103.
  • Figure IC shows a back cover 161 of the portable radio device 10 into which the radiation patch 103 has beenassembled.
  • Figure ID is a top view of a portable radio device 10 of Figure 1A.
  • the outer periphery OP of the radiation patch 103 follows substantially a periphery PG of the ground plane 101.
  • a free end of the first part LA of the radiation patch 103 or a free end of the second part RA of the radiation patch 103 can be bent towards the ground plane 101.
  • the free end of a first part LA can be bent towards the second part RA, or the free end of the second part RA can be bent towards the first part LA.
  • FIG 2 is a perspective view of portable radio device 20 which is similar to portable radio device 10 of Figure 1A except that it further comprises a parasitic element, especially a strip 201 of conductive material substantially following the inner periphery IP of the radiation patch 103.
  • a parasitic element especially a strip 201 of conductive material substantially following the inner periphery IP of the radiation patch 103.
  • a proper design of the parasitic element increases the bandwidth in the higher bands .
  • Figures 3A to 3D show measured S itch charts for the portable radio device for different cellular frequency bands.
  • Figures 4A to 4D show measured Voltage-to-Standing Wave Ratio VSWR charts for the portable radio device 10 for different cellular frequency bands.
  • Figures 3A and 4A illustrate the GSM 850 frequency band.
  • Figures 3B and 4B illustrate the GSM 900 frequency band.
  • Figures 3C and 4C illustrate the GSM 1800 frequency band.
  • Figures 3D and 4D illustrate the GSM 1900 frequency band.
  • a bandwidth of 15.7% can be obtained for a VSWR of less than 3:1, corresponding to a frequency band of 820 - 960 MHz.
  • the bandwidth of 15.1% can be obtained, corresponding to a frequency band of 1.710-1.990 GHz.
  • Figure 5 is a block diagram showing a portable radio device 10 or 20 used for communication in all four frequency bands.
  • a portable radio device 10 or 20 comprises means, such as a processing unit 503, for selecting a frequency band BAND of four different cellular network frequency bands GSM 850 MHz, GSM 900 MHz, GSM 1800 MHz, or GSM 1900 MHz.
  • the means for selecting a frequency band BAND can be adapted to receive a pulsing signal from a system clock 501. For different frequency bands and channel frequencies, the frequency of the system clock may be multiplied by performing different operations in the processing unit 503.
  • the processing unit 503 can take care of converting data bits to a modulated signal and of converting received modulated signal to data bits. If necessary, an intermediate frequency converter and a multiplexer can be included in the transmitter or receiver chain but this is not necessary since the transmitter and receiver can be implemented with software.
  • the portable radio device 10 or 20 may comprise means 505 adapted to generate an electromagnetic signal to be fed to the feed line 105, the electromagnetic signal having a form belonging to a channel CH of the cellular network frequency band BAND selected when transmitted via an antenna, which now comprises the radiation patch 103 and the ground plane 101.
  • the portable radio device 10 or 20 may comprise means 507 adapted to receive an electromagnetic signal from the feed line 105, the electromagnetic signal having a form belonging to a channel CH of the cellular network frequency band BAND selected.
  • the feed line 105 may further comprise a match 509 for matching the electromagnetic reflection coefficient of the radiation patch 103, wherein the match 509 is a high-Q coil, causing only low Ohmic losses.
  • a high-Q coil is a wire-wound coil.
  • Other kinds of coils, such as multi-layer or filter coils are not that good since they cause higher

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Waveguide Aerials (AREA)
  • Support Of Aerials (AREA)

Abstract

L'invention concerne un dispositif radio portable (10; 20) qui comprend un plan de sol (101), une plaque de rayonnement (103) et une ligne d'alimentation (105) reliée à la plaque de rayonnement (103) afin d'appliquer un signal électromagnétique à cette dernière ou de recevoir un signal électromagnétique en provenance de cette dernière. La plaque de rayonnement (103) est placée au-dessus du plan de sol (101) duquel elle est électriquement isolée, à part une connexion à travers la ligne d'alimentation (105), et elle possède une forme qui laisse une partie uniforme du plan de sol (101) découverte entre une première partie (LA) de la plaque de rayonnement (103) et une seconde partie (RA) de la plaque de rayonnement (103).
PCT/EP2004/005041 2004-05-11 2004-05-11 Dispositif radio portable WO2005109570A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PCT/EP2004/005041 WO2005109570A1 (fr) 2004-05-11 2004-05-11 Dispositif radio portable

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/EP2004/005041 WO2005109570A1 (fr) 2004-05-11 2004-05-11 Dispositif radio portable

Publications (1)

Publication Number Publication Date
WO2005109570A1 true WO2005109570A1 (fr) 2005-11-17

Family

ID=34957630

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2004/005041 WO2005109570A1 (fr) 2004-05-11 2004-05-11 Dispositif radio portable

Country Status (1)

Country Link
WO (1) WO2005109570A1 (fr)

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1024552A2 (fr) * 1999-01-26 2000-08-02 Siemens Aktiengesellschaft Antenne pour terminaux de radiocommunication sans fil
WO2002050948A1 (fr) * 2000-12-20 2002-06-27 Allgon Mobile Communications Ab. Dispositif d'antenne et procede de reglage d'un tel dispositif d'antenne
DE10109707A1 (de) * 2001-02-11 2002-08-14 Lutz Rothe Subminiatur-Verbundstrahlersystem für Mobilfunkanwendungen
US20020149524A1 (en) * 2001-03-01 2002-10-17 Koninklijke Philips Electronics N.V. Antenna arrangement
WO2004027928A1 (fr) * 2002-09-23 2004-04-01 Telefonaktiebolaget L M Ericsson (Publ) Antenne planaire

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1024552A2 (fr) * 1999-01-26 2000-08-02 Siemens Aktiengesellschaft Antenne pour terminaux de radiocommunication sans fil
WO2002050948A1 (fr) * 2000-12-20 2002-06-27 Allgon Mobile Communications Ab. Dispositif d'antenne et procede de reglage d'un tel dispositif d'antenne
DE10109707A1 (de) * 2001-02-11 2002-08-14 Lutz Rothe Subminiatur-Verbundstrahlersystem für Mobilfunkanwendungen
US20020149524A1 (en) * 2001-03-01 2002-10-17 Koninklijke Philips Electronics N.V. Antenna arrangement
WO2004027928A1 (fr) * 2002-09-23 2004-04-01 Telefonaktiebolaget L M Ericsson (Publ) Antenne planaire

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