EP1672732B1 - Mäanderförmige Antenne mit niedrigem Profil - Google Patents

Mäanderförmige Antenne mit niedrigem Profil Download PDF

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Publication number
EP1672732B1
EP1672732B1 EP04257844A EP04257844A EP1672732B1 EP 1672732 B1 EP1672732 B1 EP 1672732B1 EP 04257844 A EP04257844 A EP 04257844A EP 04257844 A EP04257844 A EP 04257844A EP 1672732 B1 EP1672732 B1 EP 1672732B1
Authority
EP
European Patent Office
Prior art keywords
antenna
portions
low profile
meander
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.)
Active
Application number
EP04257844A
Other languages
English (en)
French (fr)
Other versions
EP1672732A1 (de
Inventor
Yihong Qi
Perry Jarmuszewski
Ying Tong Man
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.)
BlackBerry Ltd
Original Assignee
Research in Motion Ltd
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 Research in Motion Ltd filed Critical Research in Motion Ltd
Priority to EP04257844A priority Critical patent/EP1672732B1/de
Priority to DE602004007023T priority patent/DE602004007023T2/de
Priority to AT04257844T priority patent/ATE364910T1/de
Publication of EP1672732A1 publication Critical patent/EP1672732A1/de
Priority to HK06113370A priority patent/HK1091598A1/xx
Application granted granted Critical
Publication of EP1672732B1 publication Critical patent/EP1672732B1/de
Active legal-status Critical Current
Anticipated expiration legal-status Critical

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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
    • H01Q1/12—Supports; Mounting means
    • H01Q1/22—Supports; Mounting means by structural association with other equipment or articles
    • 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

Definitions

  • the present invention relates to a low-profile antenna for use in mobile computing devices, and more particularly, to an antenna having a meandering configuration.
  • Fig. 1 shows a portion of a Personal Computer Memory Card International Association (PCMCIA) card having a wireless modem.
  • PCMCIA Personal Computer Memory Card International Association
  • U.S. Patent No. 5,373,149 assigned to AT&T Bell Laboratories, shows circuit card 76 having located thereon battery 80, antenna 82, infra-red transceiver 84, transmit/receive electronics 86 and electrical contacts 92.
  • Antenna 82 depends on circuit card 76 to radiate. Since the personal computer used with the wireless modem also naturally radiates energy, the personal computer and the wireless modem interfere with each other.
  • Fig. 2 shows an end of a PCMCIA wireless modem package opposite the end inserted into a PCMCIA slot of a computing device.
  • U.S. Patent No. 5,583,521 assigned to GEC Plessey Semiconductors, Inc., shows PCMCIA package 3 with transparent containment 5 (suggested in phantom) that contains a low profile, paired L-shape antenna system including vertical legs 6a', 6b' and horizontal legs 6a", 6b" made of copper wire and separated in a diversity pattern. Horizontal legs 6a", 6b" meander in a horizontal plane within transparent containment 5.
  • the antenna system avoids use of a conventional monopole whip antenna that cannot readily fit into a low profile enclosure.
  • Shielded package 3 acts as a ground plane system for the antenna system.
  • Fig. 3 shows an extendable whip antenna for use in a mobile telephone having a radiating element with a meandering and cylindrical configuration.
  • U.S. Patent No. 6,351,241 assigned to Allgon AB, shows elongated dielectric portion 30 having a length essentially equal to the length of cylindrically configured meander element 35.
  • Impedance matching means 32 connects to a feed point of meander element 35, is integrated on dielectric carrier 33, and includes contacts at its base for connection to signal and ground connectors of the telephone.
  • the meander antenna provides a greater bandwidth, improved production tolerances leading to less rejections, a lower degree of coupling to any adjacent radiators greatly improving multi-band operability and integration of a matching network using at least partly the same manufacturing technique.
  • the whip antenna cannot fit into a low-profile package.
  • the wireless modem as well as the personal computer used with the wireless modem, naturally radiates energy, the personal computer and the wireless modem interfere with each other. Accordingly, it is desirable to provide a wireless modem in a low-profile package that is more immune to interference from the computing device with which the wireless modem is used.
  • European patent application No. 1189304 describes an antenna device and a radio communication card.
  • the antenna has an inversed F-type antenna pattern and a meander type pattern formed on a surface.
  • US patent No. 6147655 describes a flat loop antenna pattern.
  • the antenna has an open-loop configuration and a matching network coupled to the second and third portions.
  • such antennas may have a closed-loop instead.
  • the antenna typically has a low-profile configuration, the first portion being horizontal, and the second and third portions being vertical.
  • the antenna has an average gain of 2.5 dBi or better, and a peak gain of 0.1 dBi or better.
  • the antenna also has fourth and fifth portions each having a meandering path, the fourth portion connected to the second portion, the fifth portion connected to the third portion, so that the first, second, third, fourth and fifth portions are in series.
  • an open-loop antenna comprising first, second, third, fourth and fifth portions connected serially.
  • the first, third and fifth portions have meandering paths, and the fifth portion is coupled to a current source or transceiver.
  • a closed-loop antenna comprising a matching network that is coupled to a current source or transceiver, and first, second, third, fourth and fifth portions connected serially.
  • the first, third and fifth portions have meandering paths, and the first and fifth portions are connected to the matching network.
  • a low profile antenna has a meander length based on the full electrical wavelength of the signal being transmitted or received.
  • the antenna has an open-loop structure with a matching network.
  • low profile means having a height that is generally less than the height of the device, such as a personal computer, to which the antenna including the circuit board for the antenna is coupled, and without an extendable whip antenna.
  • the low profile enables the antenna to be used in a card for a device such as a personal computer, personal digital assistant, wireless telephone and so on with minimal risk of the antenna breaking off, as compared with a prior art antenna having a higher height and thus more likelihood of being broken from its card.
  • the low profile antenna is carefully designed so that it avoids using its card as a radiator, that is, its radiation pattern is based on the low profile antenna and not associated structures such as the card or the device that the card is used with.
  • Fig. 4A shows open-loop antenna 100 on PCMCIA card 150 having side portions 105, 115, top portion 110, bottom left portion 120 and bottom right portion 130. Side portions 105, 115 have straight paths. Top and bottom portions 110, 120, 130 have meandering paths. Bottom left portion 120 has a floating end. Bottom right portion 130 is coupled to a current source or transceiver.
  • side portions 105, 115 have meandering paths.
  • Open-loop antenna 100 generally has a width that is determined by the width of PCMCIA card 150, and a height that is about one-half of its width. Increasing the height of open-loop antenna 100 reduces the length of the meander portions needed to obtain a full wavelength, thereby allowing more current to flow in the vertical direction and increasing the antenna's efficiency.
  • Fig. 4B shows measurements of open-loop antenna 100 in mm. Its overall width is seen to be about 64 mm and its height is about 32 mm.
  • Figs. 5A-5C show different meander configurations: a Roman key-type meander, a sinusoidal meander and a sawtooth meander.
  • the meander sections are electrical delay lines and could be any shape such as those shown in Figs. 5A-5C, an inverted Q shape, and so on.
  • Fig. 6A shows an example cited as useful for understanding the invention, here a closed-loop antenna 200 is on PCMCIA card 250 having side portions 205, 215, top portion 210, bottom left portion 220 and bottom right portion 230. All of portions 205, 215, 210, 220, 230 have meandering paths. Bottom left portion 220 and bottom right portion 230 are coupled to matching network 240, which is coupled to a current source or transceiver.
  • side portions 205, 215 have straight, non-meandering paths.
  • Matching network 240 is designed to match antenna 200 to a typical 50 ohm load presented by the source or transceiver that antenna 200 is coupled to.
  • a typical matching network is a T-type or Pi-type, known to those of ordinary skill in the art of antenna design.
  • FIG. 6B shows measurements of closed-loop antenna 200 in mm. Its overall width is seen to be about 42 mm and its height is about 30 mm.
  • Figs. 7A-7C are antenna gain patterns for open-loop antenna 100 in the XY, XZ and YZ planes, respectively, for a signal at 915 MHz.
  • the peak antenna gain is 0.59 dBi.
  • the average gain is -2.11 dBi.
  • the X-plane corresponds to the long dimension of card 150.
  • the Y-plane corresponds to the short dimension of card 150.
  • the Z-plane corresponds to the height of card 150.
  • Theta and phi refer to (r, ⁇ , ⁇ ) spherical coordinates, instead of (x, y, z) Cartesian coordinates. It will be recalled that a gain of -3 dBi corresponds to half of the signal energy being dissipated, whereas a gain of -2 dBi means less than half of the signal energy is dissipated.
  • Figs. 8A-8C are antenna gain patterns for closed-loop antenna 200 in the XY, XZ and YZ planes, respectively, for a signal at 915 MHz.
  • Theantenna gain is 0.19 dBi.
  • the average gain is -2.42 dBi.
  • Fig. 9 shows return loss for open-loop antenna 100.
  • Fig. 10 shows return loss for closed-loop antenna 200.
  • Fig. 11 shows impedance for open-loop antenna 100.
  • Fig. 12 shows impedance for closed-loop antenna 200.

Landscapes

  • Details Of Aerials (AREA)
  • Support Of Aerials (AREA)
  • Transceivers (AREA)

Claims (7)

  1. Open-loop-Antenne mit niedrigem Profil, umfassend:
    Erste (120), zweite (105) , dritte (110), vierte (115) und fünfte (130) Abschnitte, die in einer kontinuierlichen, rechteckförmigen Schleife mit dem ersten (120) und fünften (130) Abschnitt, welche untere Abschnitte sind, dem zweiten (105) und vierten (115) Abschnitt, welche Seitenabschnitte sind, und dem dritten (110) Abschnitt, welcher ein oberer Abschnitt der rechteckförmigen Schleife ist, seriell verbunden sind,
    wobei der erste (120), dritte (110) und fünfte (130) Abschnitt mäanderförmige Wege aufweist,
    der zweite (105) und vierte (115) Abschnitt gerade Wege aufweist,
    der erste Abschnitt (120) ein schwebendes Ende nahe dem fünften Abschnitt (130) aufweist,
    der fünfte Abschnitt (130) mit einer Stromquelle oder einem Sender-Empfänger verbunden ist, und
    wobei die Länge der rechteckförmigen Schleife eine vollständige elektrische Wellenlänge des zu übertragenden oder zu empfangenden Signals ist.
  2. Open-loop-Antenne mit niedrigem Profil nach Anspruch 1, wobei die Länge jeweils von dem zweiten (105) und vierten (115) Abschnitt kleiner ist als die Länge von dem dritten (110) Abschnitt.
  3. Open-loop-Antenne mit niedrigem Profil nach Anspruch 1, wobei die mäanderförmigen Wege eine Konfiguration aufweisen, die eine aus einem romanischen Schlüsseltypischen Mäander (5A), einem sinusförmigen Mäander (5B), Mäander (5A), einem sinusförmigen Mäander (5B), einem Sägezahn-förmigen Mäander (5C) und einem umgekehrten Ω-Mäander ist.
  4. Open-loop-Antenne mit niedrigem Profil nach Anspruch 1, die einen Durchschnittsgewinn von -2,5 dBi oder größer aufweist.
  5. Open-loop-Antenne mit niedrigem Profil nach Anspruch 1, die einen Spitzengewinn von 0,1 dBi oder größer aufweist.
  6. PCMCIA-Karte, die eine Antenne umfasst, welche in einem der vorhergehenden Ansprüche beansprucht ist.
  7. PCMCIA-Karte nach Anspruch 6, wobei sich der erste (120), dritte (110) und fünfte (130) Abschnitt der Antenne in einer Richtung im Wesentlichen parallel zu der Oberfläche der PCMCIA-Karte (150) erstrecken und sich der zweite (105) und vierte (115) Abschnitt der Antenne in einer Richtung im Wesentlichen senkrecht zu der Oberfläche der PCMCIA-Karte (150) erstrecken.
EP04257844A 2004-12-16 2004-12-16 Mäanderförmige Antenne mit niedrigem Profil Active EP1672732B1 (de)

Priority Applications (4)

Application Number Priority Date Filing Date Title
EP04257844A EP1672732B1 (de) 2004-12-16 2004-12-16 Mäanderförmige Antenne mit niedrigem Profil
DE602004007023T DE602004007023T2 (de) 2004-12-16 2004-12-16 Mäanderförmige Antenne mit niedrigem Profil
AT04257844T ATE364910T1 (de) 2004-12-16 2004-12-16 Mäanderförmige antenne mit niedrigem profil
HK06113370A HK1091598A1 (en) 2004-12-16 2006-12-05 Low profile full wavelength meander type antenna

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP04257844A EP1672732B1 (de) 2004-12-16 2004-12-16 Mäanderförmige Antenne mit niedrigem Profil

Publications (2)

Publication Number Publication Date
EP1672732A1 EP1672732A1 (de) 2006-06-21
EP1672732B1 true EP1672732B1 (de) 2007-06-13

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Family Applications (1)

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EP04257844A Active EP1672732B1 (de) 2004-12-16 2004-12-16 Mäanderförmige Antenne mit niedrigem Profil

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EP (1) EP1672732B1 (de)
AT (1) ATE364910T1 (de)
DE (1) DE602004007023T2 (de)
HK (1) HK1091598A1 (de)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101989676A (zh) * 2009-08-07 2011-03-23 西门子公司 用于无线射频识别系统的天线及其配置方法和无线射频识别读写器
CN102299406B (zh) * 2011-06-16 2014-09-24 上海安费诺永亿通讯电子有限公司 一种用于移动终端的多频天线
FR3003696B1 (fr) * 2013-03-19 2016-08-19 Univ Lyon 1 Claude Bernard Antenne radioelectrique et dispositif radioelectrique

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6147655A (en) * 1998-11-05 2000-11-14 Single Chip Systems Corporation Flat loop antenna in a single plane for use in radio frequency identification tags
JP4461597B2 (ja) * 2000-09-19 2010-05-12 ソニー株式会社 無線カードモジュール
GB0030741D0 (en) * 2000-12-16 2001-01-31 Koninkl Philips Electronics Nv Antenna arrangement

Also Published As

Publication number Publication date
HK1091598A1 (en) 2007-01-19
ATE364910T1 (de) 2007-07-15
EP1672732A1 (de) 2006-06-21
DE602004007023D1 (de) 2007-07-26
DE602004007023T2 (de) 2008-02-14

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