WO2007077461A1 - Dispositif d'antenne pour ordinateur portable - Google Patents

Dispositif d'antenne pour ordinateur portable Download PDF

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Publication number
WO2007077461A1
WO2007077461A1 PCT/GB2007/050002 GB2007050002W WO2007077461A1 WO 2007077461 A1 WO2007077461 A1 WO 2007077461A1 GB 2007050002 W GB2007050002 W GB 2007050002W WO 2007077461 A1 WO2007077461 A1 WO 2007077461A1
Authority
WO
WIPO (PCT)
Prior art keywords
pifas
antenna arrangement
antenna
pifa
matching circuit
Prior art date
Application number
PCT/GB2007/050002
Other languages
English (en)
Inventor
Devis Iellici
Kiyun Han
Hongfei Hu
Vijay Nahar
Robert Schlub
Original Assignee
Antenova Limited
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 Antenova Limited filed Critical Antenova Limited
Publication of WO2007077461A1 publication Critical patent/WO2007077461A1/fr

Links

Classifications

    • 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
    • H01Q5/00—Arrangements for simultaneous operation of antennas on two or more different wavebands, e.g. dual-band or multi-band arrangements
    • H01Q5/10—Resonant antennas
    • 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
    • H01Q1/2258—Supports; Mounting means by structural association with other equipment or articles used with computer equipment
    • H01Q1/2266—Supports; Mounting means by structural association with other equipment or articles used with computer equipment disposed inside the computer
    • 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
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q1/00—Details of, or arrangements associated with, antennas
    • H01Q1/36—Structural form of radiating elements, e.g. cone, spiral, umbrella; Particular materials used therewith
    • H01Q1/38—Structural form of radiating elements, e.g. cone, spiral, umbrella; Particular materials used therewith formed by a conductive layer on an insulating support
    • 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
    • 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
    • H01Q5/364—Creating multiple current paths
    • H01Q5/371—Branching current paths
    • 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
    • H01Q9/0407—Substantially flat resonant element parallel to ground plane, e.g. patch antenna
    • H01Q9/0421—Substantially flat resonant element parallel to ground plane, e.g. patch antenna with a shorting wall or a shorting pin at one end of the element

Definitions

  • the present invention relates to a small multi-band antenna device designed for incorporation into a laptop computer, tablet computer, personal digital assistant (PDA), navigation device (e.g. GPS device), printer or other peripheral device, and small platforms generally.
  • PDA personal digital assistant
  • navigation device e.g. GPS device
  • printer or other peripheral device e.g., printer or other peripheral device, and small platforms generally.
  • a particular device may be required to support wireless communications by way of a number of different data standards operating in various frequency bands including cellular radio and WLAN frequency bands
  • the present invention relates to a method of constructing an electrically small antenna, some embodiments of which are capable of operating in five cellular radio bands as well as the 802.11 a/b/g WLAN frequency bands.
  • the PIFAs being arranged such that the longitudinal axes of their radiating members are substantially colinear in a given plane.
  • the PIFAs are generally elongate.
  • the PIFAs are also preferably substantially thin or planar along their longitudinal axes.
  • the given plane may be defined by a display screen of a laptop computer or PDA or other device having a display screen.
  • the PIFAs are preferably located at edges of or in a border of the display screen.
  • the first PIFA may be configured to operate over the four GSM mobile phone frequency bands: i) GSM-850 (824 - 894MHz), ii) GSM-900 (890 - 960MHz), iii) GSM-1800 (1710 - 1880MHz) and iv) GSM-1900 (1850 - 1990MHz), as well as v) the 3G Universal Mobile Telecommunications System (UMTS) band (1920 - 2170MHz).
  • GSM-850 824 - 894MHz
  • GSM-900 890 - 960MHz
  • iv) GSM-1900 (1850 - 1990MHz
  • UMTS 3G Universal Mobile Telecommunications System
  • this spectrum coverage is achieved by having a low band resonance (824 - 960MHz) and an upper band resonance (1710 - 2170MHz). These bands collectively form a Wireless Wide Area Network or WWAN spectrum and this antenna is known as the WWAN antenna.
  • the second PIFA may be configured to operate over the IEEE 802.11 Wi-Fi or bands: i) 802.11 b/g (2.4 - 2.4835GHz) and ii) 802.11 a (4.9 to 5.825GHz).
  • WLAN Wireless Local Area Network
  • the first PIFA is a WWAN antenna structure with a first co-axial feed cable
  • the second PIFA is a WLAN antenna structure with a second co-axial feed cable.
  • the two PIFAs are mounted in a colinear fashion within a single structure.
  • the isolation between the WWAN and WLAN antennas is advantageously 13dB or better, such good isolation between two closely spaced colinear antennas forming an important part of the first aspect of the present invention.
  • the isolation across all the bands can be seen in Figure 1.
  • the voltage standing wave ratio (VSWR) across WWAN and WLAN is shown in Figures 2 and 3.
  • a PIFA generally consists of a driven conductive radiating element (generally a quarter- wavelength element) connected to RF ground and substantially parallel to a conductive groundplane, for example a metal housing of an appliance.
  • a driven conductive radiating element generally a quarter- wavelength element
  • the PIFA itself may be an effective radiator, but at lower frequencies the PIFA may be electrically too small to radiate and the groundplane becomes a significant part of the radiating structure.
  • GSM operation it is important that the PIFA has a groundplane large enough to radiate effectively down to 824MHz. This implies that at least one of the groundplane dimensions should be of the order of 90mm or longer.
  • Antennas that will fit round the edge of a laptop or other display screen are necessarily thin, elongate structures having a groundplane very little larger than the radiating structure. It is therefore desirable electrically to connect the antenna groundplane to the display screen, which is a large grounded structure.
  • Connections between the two PIFAs and the display grounded structures may be made by electrically conductive connections such as strips of conductive tape foils (e.g. copper tape) or other conductive connections generally extending along the length of the PIFA groundplane.
  • Alternative methods include extensions of the antenna groundplane providing a flap which either makes contact with a metal housing of the display via a foam gasket with conductive surface properties or by capacitive coupling to the larger ground using double sided adhesive.
  • mechanical constraints can make such methods of connection difficult to achieve or electrically unreliable.
  • preferred embodiments of the present invention additionally comprise first and second spring members electrically connected respectively to the ground member of each of the first and second PIFAs.
  • the spring members are adapted to form an electrical ground connection to a grounded display screen of laptop computer or the like, as shown in Figures 4 and 5.
  • a PIFA generally consists of a quarter wavelength radiator, grounded at one end.
  • Embodiments of the present invention combine two PIFA structures, back-to-back, at the grounding point. This enables both PIFAs to be located fairly close to each other while still operating with reasonable independence.
  • Connection to the larger common groundplane may be made by way of a leaf spring structure, which may also mechanically attach to a dielectric (e.g. ABS) carrier and be soldered to an outer of a feeding cable.
  • This grounding spring is best positioned within the region of the common ground and where this is not possible, the spring may be grounded to a conductive strip which in turn is connected to the region of the common ground.
  • a corresponding number of spring members may be provided (one for each PIFA).
  • the second PIFA when configured as a WLAN PIFA generally achieves sufficiently good performance without the need for a matching circuit.
  • the present applicant has found that the performance of the first PIFA when configured as a WWAN PIFA can be improved through the provision of a matching circuit, especially in the lower band.
  • the feedline e.g. coaxial cable, microstrip, coplanar waveguide etc
  • a matching circuit located on a main PCB (printed circuit board).
  • Matching components generally take the form of discrete inductors and capacitors and may be applied to the feed pin of the PIFA, the shorting or ground pin, or both.
  • an antenna device fabricated from a sheet of flexible conductive material supported by and fitted about a dielectric carrier, wherein the antenna device includes an integral matching circuit formed from the sheet of flexible conductive material.
  • the sheet of flexible conductive material may comprise a net or web having a predetermined form adapted to be folded around the dielectric carrier and secured thereto.
  • the net or web may be manufactured by application of known photoresist techniques.
  • the dielectric carrier may be made of ABS or any other suitable dielectric material.
  • the sheet of flexible conductive material may, for example, be 18 ⁇ m copper on 25 ⁇ m Kapton with VHB adhesive backing, available from Lyncolec. This form of antenna construction is known in the art (see, for example, Salonen, P. & Rantanen, J.
  • the matching circuit may include capacitive and/or inductive components formed from the sheet of flexible conductive material.
  • the matching circuit may include a delay line, for example a thin conductive track that is not conductively connected to a main web or net of the sheet of flexible conductive material.
  • the matching circuit By making the matching circuit part of the antenna structure rather than, as is conventional, part of the feed structure, significant savings in manufacturing costs can be obtained. Moreover, moving the matching circuit onto the antenna structure has advantages for WWAN antenna efficiency in the low band.
  • Incorporating a delay line into the matching circuit allows the resonant loop to be moved around the Smith chart when designing antenna structures, for example enabling the resonant loop to be moved to a more convenient location for matching.
  • An increase in electrical delay to the input of the antenna will rotate the locus of the complex impedance on the Smith chart. This gives an additional variable for matching the antenna, in conjunction with the SMT matching components. This simplifies the matching circuit and reduces losses.
  • By selecting an appropriate inductance for the delay line it is also possible to simplify the matching circuit and reduce losses.
  • FIGURE 1 shows a plot of isolation between WWAN and WLAN antennas mounted on a single structure of an embodiment of the invention
  • FIGURE 2 shows a plot of VSWR of a WWAN antenna at its connector, including 600mm, 1.37mm OD coaxial cable;
  • FIGURE 3 shows a plot of VSWR of a WLAN antenna at its connector, including 600mm, 1.37mm OD coaxial cable;
  • FIGURE 4 shows an embodiment of the present invention including a pair of grounding springs
  • FIGURE 5 shows a detail of the embodiment of Figure 4.
  • FIGURE 6 shows an embodiment of the second aspect of the present invention.
  • Figure 1 shows a plot of isolation against frequency for an antenna structure comprising a first PIFA in the form of a WWAN antenna and a second PIFA in the form of a WLAN antenna (as described hereinbefore), the PIFAs having a co-linear configuration.
  • Figure 2 shows a plot of VSWR for the WWAN antenna, measured at its connector
  • Figure 3 shows a plot of VSWR for the WLAN antenna, measured at its connector.
  • FIG 4 shows an embodiment of the first aspect of the present invention, comprising a dielectric carrier 1 made of ABS or similar material, a first WWAN PIFA 2 made of a thin conductive layer wrapped onto the carrier 1 , and a second WLAN PIFA 3 also made of a thin conductive layer wrapped onto the carrier 1. It can be seen that the first 2 and second 3 PIFAs are disposed in a co-linear arrangement.
  • Each PIFA 2, 3 has a grounding or shorting element that is conductively connected to a conductive spring member 4, 5 adapted to make an electrical point connection to a groundplane of a display screen of a laptop computer or the like (not shown).
  • FIG. 5 is a close-up detail of Figure 4, more clearly showing the conductive spring member 4 of the first PIFA 2.
  • the PIFA 2 includes a cable feed point 6, a grounded region 7, connections to ground 8, 9, a 1.5pF shunt capacitor 10, a 4.7nH shunt inductor 11 , matching stubs 12, 13, and a transmission line 14 for feeding the radiating member(s) (not shown) of the PIFA 2 via a series 1.5pF capacitor 15. All of these components are wrapped around a dielectric carrier 1.
  • Each PIFA 1, 2 has its own separate feed and grounding spring, and consists of a dual band resonating structure.
  • the capacitive and/or inductive matching components 10, 11 , 15 are optionally provided so as to improve the performance of the antenna device.
  • FIG. 6 there is shown web or net 16 of a flexible conductive material, for example a flexicircuit fabricated using photoresist techniques.
  • the flexicircuit 16 is designed so that it can be wrapped around a dielectric carrier (not shown in Figure 6, but shown as item 1 in Figures 4 and 5).
  • the web or net 16 includes the WWAN high band 17 and low band 18 resonators, the WLAN high band 19 and low band 20 resonators, together with the WLAN feed point 21 and WWAN feed point 22.
  • Figures 4 and 5 show the WWAN cable feed 6 soldered at the WWAN feed point 22.
  • the web or net 16 when wrapped around a dielectric carrier 1 , forms a double PIFA suitable for use with the first aspect of the present invention.
  • the web or net 16 when wrapped around a dielectric carrier 1 , forms a double PIFA suitable for use with the first aspect of the present invention.
  • the web or net 16 when wrapped around a dielectric carrier 1 , forms a double PIFA suitable for use
  • 16 includes an integrated matching circuit indicated generally at 23 including a delay line 24 that is not directly conductively connected to the main body of the web or net 16.

Landscapes

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

Abstract

L'invention porte sur un agencement d'antenne pour dispositif informatique portable, lequel agencement d'antenne comprend au moins une première et une seconde antenne en F inversé plate ('planar inverted-F antennas' ou PIFA) comportant chacune un élément rayonnant conducteur possédant un axe longitudinal, un élément électroconducteur destiné à relier l'élément rayonnant à une alimentation électrique, et un élément électroconducteur destiné à relier l'élément rayonnant à la terre. Les antennes PIFA sont agencées de telle manière que les axes longitudinaux de leurs éléments rayonnants sont sensiblement colinéaires dans un plan donné. Dans certains modes de réalisation, les antennes PIFA sont formées d'une feuille de matériau conducteur souple montée sur un élément de mise en forme diélectrique, avec un circuit d'adaptation intégré.
PCT/GB2007/050002 2006-01-06 2007-01-02 Dispositif d'antenne pour ordinateur portable WO2007077461A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB0600223.2 2006-01-06
GB0600223A GB2434037B (en) 2006-01-06 2006-01-06 Laptop computer antenna device

Publications (1)

Publication Number Publication Date
WO2007077461A1 true WO2007077461A1 (fr) 2007-07-12

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Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/GB2007/050002 WO2007077461A1 (fr) 2006-01-06 2007-01-02 Dispositif d'antenne pour ordinateur portable

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GB (1) GB2434037B (fr)
TW (1) TW200740024A (fr)
WO (1) WO2007077461A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2012015558A1 (fr) * 2010-07-30 2012-02-02 Motorola Solutions, Inc. Antenne intégrée à un dispositif de communication portable

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2942915A1 (fr) * 2009-03-06 2010-09-10 Thomson Licensing Systeme d'antennes compact
US9160056B2 (en) * 2010-04-01 2015-10-13 Apple Inc. Multiband antennas formed from bezel bands with gaps
CN111864350B (zh) 2019-04-29 2021-08-24 北京小米移动软件有限公司 天线和终端

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US6476769B1 (en) * 2001-09-19 2002-11-05 Nokia Corporation Internal multi-band antenna
US20050093752A1 (en) * 2003-10-31 2005-05-05 Ping-Xi Cheng Antenna set for mobile devices
WO2005099040A1 (fr) * 2004-04-06 2005-10-20 Koninklijke Philips Electronics N.V. Ensemble d'antennes planaires a antennes planaires en f inverse a commutation de doubles systemes mecaniques microelectriques
US20050285804A1 (en) * 2004-06-24 2005-12-29 Lenovo (Singapore) Pte. Ltd. Portable information terminal with communication capabilities

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Publication number Priority date Publication date Assignee Title
US6476769B1 (en) * 2001-09-19 2002-11-05 Nokia Corporation Internal multi-band antenna
US20050093752A1 (en) * 2003-10-31 2005-05-05 Ping-Xi Cheng Antenna set for mobile devices
WO2005099040A1 (fr) * 2004-04-06 2005-10-20 Koninklijke Philips Electronics N.V. Ensemble d'antennes planaires a antennes planaires en f inverse a commutation de doubles systemes mecaniques microelectriques
US20050285804A1 (en) * 2004-06-24 2005-12-29 Lenovo (Singapore) Pte. Ltd. Portable information terminal with communication capabilities

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2012015558A1 (fr) * 2010-07-30 2012-02-02 Motorola Solutions, Inc. Antenne intégrée à un dispositif de communication portable
US8432323B2 (en) 2010-07-30 2013-04-30 Motorola Solutions, Inc. Antenna integrated with a portable communication device

Also Published As

Publication number Publication date
GB0600223D0 (en) 2006-02-15
TW200740024A (en) 2007-10-16
GB2434037B (en) 2009-10-14
GB2434037A (en) 2007-07-11

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