EP1324424A1 - Antenna device for bluetooth systems - Google Patents

Antenna device for bluetooth systems Download PDF

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Publication number
EP1324424A1
EP1324424A1 EP01130879A EP01130879A EP1324424A1 EP 1324424 A1 EP1324424 A1 EP 1324424A1 EP 01130879 A EP01130879 A EP 01130879A EP 01130879 A EP01130879 A EP 01130879A EP 1324424 A1 EP1324424 A1 EP 1324424A1
Authority
EP
European Patent Office
Prior art keywords
antenna arrangement
circuit board
printed circuit
antenna
printed
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.)
Ceased
Application number
EP01130879A
Other languages
German (de)
French (fr)
Inventor
Sheng-Gen Dr. Pan
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.)
Siemens AG
Original Assignee
Siemens AG
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 Siemens AG filed Critical Siemens AG
Priority to EP01130879A priority Critical patent/EP1324424A1/en
Publication of EP1324424A1 publication Critical patent/EP1324424A1/en
Ceased legal-status Critical Current

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Classifications

    • 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
    • H01Q9/30—Resonant antennas with feed to end of elongated active element, e.g. unipole
    • 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
    • H01Q23/00—Antennas with active circuits or circuit elements integrated within them or attached to them
    • 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
    • H01Q9/30—Resonant antennas with feed to end of elongated active element, e.g. unipole
    • H01Q9/42—Resonant antennas with feed to end of elongated active element, e.g. unipole with folded element, the folded parts being spaced apart a small fraction of the operating wavelength

Definitions

  • the present invention relates to a Antenna arrangement for Bluetooth systems.
  • Bluetooth systems are used, for example, in cell phones Communication device for connecting with others Application devices, such as personal computers, are used.
  • the Bluetooth system requires an antenna to receive radio signals to send and receive. Because the size of a Cell phones is a very important factor in its design, is a miniaturization of Bluetooth antennas and one efficient use of available space The key to achieving both is cheap Performance for the antenna and an appealing Design.
  • Bluetooth antenna arrangements there are three main embodiments for Bluetooth antenna arrangements known.
  • the first is based on the technology of printed circuit boards. After that a Bluetooth antenna arrangement directly on one printed circuit board (PCB) printed.
  • PCB printed circuit board
  • This Embodiment has the disadvantage that the antenna only has a two-dimensional surface structure so that it a lot of space on the printed circuit board required and requires large dimensions of a mobile phone.
  • antennas are made from stamped and bent parts used on the base plate of the printed circuit board are arranged.
  • At this Embodiment of a Bluetooth antenna is only the Space on one side of the printed circuit board for used the antenna.
  • ceramic antennas used. Ceramic antennas small, but they need a comparatively large one free space surrounding the antennas. In addition, they are Ceramic antenna costs very high.
  • the invention is based on the object an inexpensive antenna arrangement, especially for To create bluetooth systems where the available standing space within a cell phone or one surrounding housing is used more efficiently.
  • the first part of the antenna arrangement the is printed on a printed circuit board, and the second part of the antenna arrangement, which is considered electrical conductive sheet is formed, arise both compared to the embodiment in the prior art, in which the antenna is printed only on the circuit board is, as well as compared to the embodiment, which is a stamped and bent part has significant advantages.
  • the first part of the Antenna arrangement required on the printed Circuit board comparatively much less space as a bluetooth antenna that is printed only because the second part of the antenna arrangement can be designed for the antenna arrangement overall gives a three-dimensional structure that basically compared to a two-dimensional structure is space-saving.
  • the available space can be used more efficiently within a mobile phone, because on both sides of the printed circuit board parts of the antenna arrangement can be arranged.
  • the second part of the antenna arrangement is preferred as Stamped-bent part designed so that a three-dimensional Structure of the antenna arrangement as a whole is ensured. At least a section of the second part of the Antenna assembly can be printed out of plane Circuit board run.
  • the second part of the antenna arrangement from a contact point the printed circuit board first in substantially perpendicular to the printed circuit board and then essentially parallel to the printed one Scarf county board.
  • the second part which is designed as sheet metal the antenna array from the edge of the printed Circuit board out towards the inside of the printed circuit board can run.
  • the Antenna arrangement overall is preferred in one corner of the printed circuit board arranged.
  • FIG. 1 there is one in a corner printed circuit board G1 a first part A1 one Antenna arrangement for a Bluetooth system arranged. On a contact point P1 is the antenna arrangement to a High frequency circuit on the printed circuit board G1 connected.
  • the first part A1 of the antenna arrangement is printed on the Printed circuit board G1.
  • a contact point P2 of the first part A1 provided the antenna arrangement of a contact point P3 assigned to a second part A2 of the antenna arrangement is.
  • the two parts A1, A2 are the Antenna arrangement shown pulled apart. in the assembled state are the two contact points P2 and P3 electrically connected and the second Part A2 of the antenna arrangement is on the printed one Circuit board G1 attached.
  • the second part A2 of the antenna arrangement runs from the edge the printed circuit board G1 in the assembled Condition of the antenna arrangement initially essentially perpendicular to the plane of the printed circuit board G1. Is at a distance from the printed circuit board G1 the second part A2 of the antenna arrangement, which is a metallic stamped and bent part is involved, for example in the right one Angle bent so that one leg of the second part A2 the antenna arrangement substantially parallel to that printed circuit board G1 runs.
  • the antenna arrangement detects Figure 1 at a frequency of about 2440 MHz Reflection minimum so that the antenna arrangement for Bluetooth applications is suitable, the low Reflection coefficients between 2400 and 2500 MHz require.

Abstract

A Bluetooth antenna has a part radiator (A1) on a corner of a printed circuit board (G1) connected (P2, P3) to a stamped sheet metal bent radiator (A2).

Description

Die vorliegende Erfindung bezieht sich auf eine Antennenanordnung für Bluetooth-Systeme.The present invention relates to a Antenna arrangement for Bluetooth systems.

Bluetooth-Systeme werden beispielsweise in Mobiltelefonen als Kommunikationseinrichtung zur Verbindung mit anderen Applikationsgeräten, wie Personalcomputern, benutzt. Das Bluetooth-System benötigt eine Antenne, um Funksignale auszusenden und zu empfangen. Da die Größe eines Mobiltelefons ein sehr wichtiger Faktor für sein Design ist, ist eine Miniaturisierung von Bluetooth-Antennen und eine effiziente Ausnutzung zur Verfügung stehenden Raums ein Schlüssel dafür, beides zur erreichen, ein günstiges Leistungsvermögen für die Antenne und ein ansprechendes Design.Bluetooth systems are used, for example, in cell phones Communication device for connecting with others Application devices, such as personal computers, are used. The Bluetooth system requires an antenna to receive radio signals to send and receive. Because the size of a Cell phones is a very important factor in its design, is a miniaturization of Bluetooth antennas and one efficient use of available space The key to achieving both is cheap Performance for the antenna and an appealing Design.

Im Stand der Technik sind drei Hauptausführungsformen für Bluetooth-Antennenanordnungen bekannt. Die erste beruht auf der Technologie gedruckter Schaltkreisplatinen. Danach wird eine Bluetooth-Antennenanordnung unmittelbar auf eine gedruckte Schaltkreisplatine (PCB) gedruckt. Diese Ausführungsform hat den Nachteil, dass die Antenne lediglich eine zweidimensionale Oberflächenstruktur hat, so dass sie sehr viel Platz auf der gedruckten Schaltkreisplatine benötigt und große Abmessungen eines Mobiltelefons erfordert. Bei einer zweiten Technologie werden Antennen aus Stanz-Biege-Teilen eingesetzt, die auf der Grundplatte der gedruckten Schaltkreisplatine angeordnet sind. Bei dieser Ausführungsform einer Bluetooth-Antenne wird lediglich der Raum auf einer Seite der gedruckten Schaltkreisplatine für die Antenne genutzt. Bei einer dritten Technologie werden keramische Antennen eingesetzt. Zwar sind keramische Antennen klein, jedoch benötigen sie einen vergleichsweise großen freien Raum, der die Antennen umgibt. Zusätzlich sind die Kosten für keramische Antennen sehr hoch.In the prior art there are three main embodiments for Bluetooth antenna arrangements known. The first is based on the technology of printed circuit boards. After that a Bluetooth antenna arrangement directly on one printed circuit board (PCB) printed. This Embodiment has the disadvantage that the antenna only has a two-dimensional surface structure so that it a lot of space on the printed circuit board required and requires large dimensions of a mobile phone. In a second technology, antennas are made from stamped and bent parts used on the base plate of the printed circuit board are arranged. At this Embodiment of a Bluetooth antenna is only the Space on one side of the printed circuit board for used the antenna. With a third technology ceramic antennas used. Ceramic antennas small, but they need a comparatively large one free space surrounding the antennas. In addition, they are Ceramic antenna costs very high.

Ausgehend hiervon liegt der Erfindung die Aufgabe zugrunde, eine kostengünstige Antennenanordnung, insbesondere für Bluetooth-Systeme, zu schaffen, bei der der zur Verfügung stehende Raum innerhalb eines Mobiltelefons bzw. eines umgebenden Gehäuses effizienter genutzt wird.Proceeding from this, the invention is based on the object an inexpensive antenna arrangement, especially for To create bluetooth systems where the available standing space within a cell phone or one surrounding housing is used more efficiently.

Diese Aufgabe wird bei der eingangs genannten Antennenanordnung dadurch gelöst, dass ein erster Teil der Antennenanordnung auf eine gedruckte Schaltkreisplatine gedruckt ist, ein zweiter Teil der Antennenanordnung als Blech aus elektrisch leitendem Material ausgebildet ist und der erste Teil der Antennenanordnung und der zweite Teil der Antennenanordnung elektrisch leitend miteinanderThis task is mentioned at the beginning Antenna arrangement solved in that a first part of the Antenna arrangement on a printed circuit board is printed, a second part of the antenna arrangement as Sheet is made of electrically conductive material and the first part of the antenna arrangement and the second part of the Antenna arrangement electrically conductive with each other

Durch Kombination des ersten Teils der Antennenanordnung, der auf eine gedruckte Schaltkreisplatine gedruckt ist, und des zweiten Teils der Antennenanordnung, die als elektrisch leitfähiges Blech ausgebildet ist, ergeben sich sowohl gegenüber der Ausführungsform im Stand der Technik, bei der die Antenne ausschließlich auf die Schalkreisplatine gedruckt ist, als auch gegenüber der Ausführungsform, die ein Stanz-Biege-Teil aufweist, erhebliche Vorteile. Der erste Teil der Antennenanordnung benötigt auf der gedruckten Schaltkreisplatine vergleichsweise sehr viel weniger Platz als eine Bluetooth-Antenne, die ausschließlich gedruckt ist, denn der zweite Teil der Antennenanordnung kann derart ausgebildet sein, dass sich für die Antennenanordnung insgesamt eine dreidimensionale Struktur ergibt, die grundsätzlich gegenüber einer zweidimensionalen Struktur platzsparend ist. Zudem kann der zur Verfügung stehende Raum innerhalb eines Mobiltelefons effizienter genutzt werden, denn auf beiden Seiten der bedruckten Schaltkreisplatine können jeweils Teile der Antennenanordnung angeordnet sein. By combining the first part of the antenna arrangement, the is printed on a printed circuit board, and the second part of the antenna arrangement, which is considered electrical conductive sheet is formed, arise both compared to the embodiment in the prior art, in which the antenna is printed only on the circuit board is, as well as compared to the embodiment, which is a stamped and bent part has significant advantages. The first part of the Antenna arrangement required on the printed Circuit board comparatively much less space as a bluetooth antenna that is printed only because the second part of the antenna arrangement can be designed for the antenna arrangement overall gives a three-dimensional structure that basically compared to a two-dimensional structure is space-saving. In addition, the available space can be used more efficiently within a mobile phone, because on both sides of the printed circuit board parts of the antenna arrangement can be arranged.

Bevorzugt ist der zweite Teil der Antennenanordnung als Stanz-Biege-Teil ausgebildet, so dass eine dreidimensionale Struktur der Antennenanordnung insgesamt gewährleistet ist. Wenigstens ein Abschnitt des zweiten Teils der Antennenanordnung kann außerhalb der Ebene der gedruckten Schaltkreisplatine verlaufen.The second part of the antenna arrangement is preferred as Stamped-bent part designed so that a three-dimensional Structure of the antenna arrangement as a whole is ensured. At least a section of the second part of the Antenna assembly can be printed out of plane Circuit board run.

Bei einer besonders bevorzugten Ausführungsform verläuft der zweite Teil der Antennenanordnung von einem Kontaktpunkt an der bedruckten Schaltkreisplatine aus zunächst im wesentlichen senkrecht zu der gedruckten Schaltkreisplatine und dann im wesentlichen parallel zu der gedruckten Schalkreisplatine. Auf diese Weise kann der zur Verfügung stehende Raum innerhalb eines Mobiltelefons besonders günstig ausgenutzt werden, da der zweite, als Blech ausgeführte Teil der Antennenanordnung von dem Rand der gedruckten Schaltkreisplatine aus in Richtung auf das Innere der gedruckten Schaltkreisplatine verlaufen kann. Die Antennenanordnung insgesamt ist bevorzugt in einer Ecke der gedruckten Schaltkreisplatine angeordnet.In a particularly preferred embodiment, the second part of the antenna arrangement from a contact point the printed circuit board first in substantially perpendicular to the printed circuit board and then essentially parallel to the printed one Scarf county board. In this way, the available standing space within a cell phone is particularly cheap be used because the second part, which is designed as sheet metal the antenna array from the edge of the printed Circuit board out towards the inside of the printed circuit board can run. The Antenna arrangement overall is preferred in one corner of the printed circuit board arranged.

Ein Ausführungsbeispiel der Erfindung wird nachfolgend anhand der Zeichnungen noch näher erläutert. Es zeigen:

  • Fig.1 ein perspektivische Ansicht einer aus zwei Teilen zusammengesetzten Antennenstruktur, von denen der eine Teil auf eine gedruckte Schaltkreisplatine gedruckt ist und der andere Teil als Stanz-Biege-Teil ausgebildet ist, und
  • Fig. 2 eine grafische Darstellung des Reflektionskoeffizienten der Antennenanordnung nach Figur 1 in freiem Raum als Funktion der Frequenz.
    • An embodiment of the invention is explained in more detail below with reference to the drawings. Show it:
  • 1 shows a perspective view of an antenna structure composed of two parts, one part of which is printed on a printed circuit board and the other part is designed as a stamped and bent part, and
  • Fig. 2 is a graphical representation of the reflection coefficient of the antenna arrangement of Figure 1 in free space as a function of frequency.

    • Wie Figur 1 zu entnehmen ist, ist in einer Ecke einer gedruckten Schaltkreisplatine G1 ein erster Teil A1 einer Antennenanordnung für ein Bluetooth-System angeordnet. An einem Kontaktpunkt P1 ist die Antennenanordnung an eine Hochfrequenz-Schaltung auf der gedruckten Schaltkreisplatine G1 angeschlossen.As can be seen in FIG. 1, there is one in a corner printed circuit board G1 a first part A1 one Antenna arrangement for a Bluetooth system arranged. On a contact point P1 is the antenna arrangement to a High frequency circuit on the printed circuit board G1 connected.

    Der erste Teil A1 der Antennenanordnung ist auf die gedruckte Schaltkreisplatine G1 aufgedruckt. Am Rand der gedruckten Schaltkreisplatine ist ein Kontaktpunkt P2 des ersten Teils A1 der Antennenanordnung vorgesehen, der einem Kontaktpunkt P3 eines zweiten Teils A2 der Antennenanordnung zugeordnet ist. In der Figur 1 sind die beiden Teile A1, A2 der Antennenanordnung auseinandergezogen dargestellt. Im zusammengebauten Zustand sind die beiden Kontaktpunkte P2 und P3 elektrischleitend miteinander verbunden und der zweite Teil A2 der Antennenanordnung ist an der gedruckten Schaltkreisplatine G1 befestigt.The first part A1 of the antenna arrangement is printed on the Printed circuit board G1. On the edge of the printed Circuit board is a contact point P2 of the first part A1 provided the antenna arrangement of a contact point P3 assigned to a second part A2 of the antenna arrangement is. In Figure 1, the two parts A1, A2 are the Antenna arrangement shown pulled apart. in the assembled state are the two contact points P2 and P3 electrically connected and the second Part A2 of the antenna arrangement is on the printed one Circuit board G1 attached.

    Der zweite Teil A2 der Antennenanordnung verläuft vom Rand der gedruckten Schaltkreisplatine G1 aus im zusammengebauten Zustand der Antennenanordnung zunächst im wesentlichen senkrecht zu der Ebene der gedruckten Schaltkreisplatine G1. In einem Abstand zu der gedruckten Schaltkreisplatine G1 ist der zweite Teil A2 der Antennenanordnung, bei dem es sich um ein metallisches Stanz-Biege-Teil handelt, etwa im rechten Winkel umgebogen, so dass ein Schenkel des zweiten Teils A2 der Antennenanordnung im wesentlichen parallel zu der gedruckten Schaltkreisplatine G1 verläuft.The second part A2 of the antenna arrangement runs from the edge the printed circuit board G1 in the assembled Condition of the antenna arrangement initially essentially perpendicular to the plane of the printed circuit board G1. Is at a distance from the printed circuit board G1 the second part A2 of the antenna arrangement, which is a metallic stamped and bent part is involved, for example in the right one Angle bent so that one leg of the second part A2 the antenna arrangement substantially parallel to that printed circuit board G1 runs.

    Wie aus Figur 2 hervorgeht, weist die Antennenanordnung nach Figur 1 bei einer Frequenz von etwa 2440 MHz ein Reflexionsminimum auf, so dass die Antennenanordnung für Bluetooth-Anwendungen geeignet ist, die einen geringen Reflektionskoeffizienten zwischen 2400 und 2500 MHz erfordern.As can be seen from FIG. 2, the antenna arrangement detects Figure 1 at a frequency of about 2440 MHz Reflection minimum so that the antenna arrangement for Bluetooth applications is suitable, the low Reflection coefficients between 2400 and 2500 MHz require.

    Claims (5)

    Antennenanordnung für Bluetooth-Systeme,
    dadurch gekennzeichnet, dass
    ein erster Teil (A1) der Antennenanordnung auf eine gedruckte Schaltkreisplatine (G1) gedruckt ist,
    ein zweiter Teil der Antennenanordnung (A2) als Blech aus elektrisch leitendem Material ausgebildet ist und
    der erste Teil (A1) der Antennenanordnung und der zweite Teil (A2) der Antennenanordnung elektrisch leitend miteinander verbunden sind.    Antenna arrangement for Bluetooth systems,
    characterized in that
    a first part (A1) of the antenna arrangement is printed on a printed circuit board (G1),
    a second part of the antenna arrangement (A2) is designed as a sheet of electrically conductive material and
    the first part (A1) of the antenna arrangement and the second part (A2) of the antenna arrangement are electrically conductively connected to one another.         Antennenanordnung nach Anspruch 1,
    dadurch gekennzeichnet, dass
    der zweite Teil (A2) der Antennenanordnung als Stanz-Biege-Teil ausgebildet ist.    Antenna arrangement according to claim 1,
    characterized in that
    the second part (A2) of the antenna arrangement is designed as a stamped and bent part.         Antennenanordnung nach einem der Ansprüche 1 oder 2,
    dadurch gekennzeichnet, dass
    wenigstens ein Abschnitt des zweiten Teils )A2) der Antennenanordnung außerhalb der Ebene der gedruckten Schaltkreisplatine (G1) verläuft.    Antenna arrangement according to one of claims 1 or 2,
    characterized in that
    at least a portion of the second part) A2) of the antenna arrangement extends outside the plane of the printed circuit board (G1).         Anordnung nach Anspruch 3,
    dadurch gekennzeichnet, dass
    der zweite Teil (A2) der Antennenanordnung von einem Kontaktpunkt (P2) an der gedruckten Schaltkreisplatine (G1) aus zunächst im Wesentlichen senkrecht zu der gedruckten Schaltkreisplatine (G1) und dann im Wesentlichen parallel zu der gedruckten Schaltkreisplatine (G1) verläuft.    Arrangement according to claim 3,
    characterized in that
    the second part (A2) of the antenna arrangement extends from a contact point (P2) on the printed circuit board (G1) initially essentially perpendicular to the printed circuit board (G1) and then essentially parallel to the printed circuit board (G1).         Antennenanordnung nach einem der Ansprüche 1 bis 4,
    dadurch gekennzeichnet, dass
    sie in einer Ecke der gedruckten Schaltkreisplatine (G1) angeordnet ist.    Antenna arrangement according to one of claims 1 to 4,
    characterized in that
    it is located in a corner of the printed circuit board (G1).
    EP01130879A 2001-12-27 2001-12-27 Antenna device for bluetooth systems Ceased EP1324424A1 (en)

    Priority Applications (1)

    Application Number Priority Date Filing Date Title
    EP01130879A EP1324424A1 (en) 2001-12-27 2001-12-27 Antenna device for bluetooth systems

    Applications Claiming Priority (1)

    Application Number Priority Date Filing Date Title
    EP01130879A EP1324424A1 (en) 2001-12-27 2001-12-27 Antenna device for bluetooth systems

    Publications (1)

    Publication Number Publication Date
    EP1324424A1 true EP1324424A1 (en) 2003-07-02

    Family

    ID=8179705

    Family Applications (1)

    Application Number Title Priority Date Filing Date
    EP01130879A Ceased EP1324424A1 (en) 2001-12-27 2001-12-27 Antenna device for bluetooth systems

    Country Status (1)

    Country Link
    EP (1) EP1324424A1 (en)

    Citations (5)

    * Cited by examiner, † Cited by third party
    Publication number Priority date Publication date Assignee Title
    US5550554A (en) * 1993-05-06 1996-08-27 At&T Global Information Solutions Company Antenna apparatus
    US5767813A (en) * 1993-05-27 1998-06-16 Raytheon Ti Systems, Inc. Efficient electrically small loop antenna with a planar base element
    GB2345208A (en) * 1998-12-23 2000-06-28 Nokia Mobile Phones Ltd An antenna for edge mounting on a PCB
    US6239753B1 (en) * 1996-04-05 2001-05-29 Omron Corporation Transmitter-and-receiver device
    WO2001091236A1 (en) * 2000-05-22 2001-11-29 Telefonaktiebolaget L.M. Ericsson (Publ) Convertible dipole/inverted-f antennas and wireless communicators incorporating the same

    Patent Citations (5)

    * Cited by examiner, † Cited by third party
    Publication number Priority date Publication date Assignee Title
    US5550554A (en) * 1993-05-06 1996-08-27 At&T Global Information Solutions Company Antenna apparatus
    US5767813A (en) * 1993-05-27 1998-06-16 Raytheon Ti Systems, Inc. Efficient electrically small loop antenna with a planar base element
    US6239753B1 (en) * 1996-04-05 2001-05-29 Omron Corporation Transmitter-and-receiver device
    GB2345208A (en) * 1998-12-23 2000-06-28 Nokia Mobile Phones Ltd An antenna for edge mounting on a PCB
    WO2001091236A1 (en) * 2000-05-22 2001-11-29 Telefonaktiebolaget L.M. Ericsson (Publ) Convertible dipole/inverted-f antennas and wireless communicators incorporating the same

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