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WO2001028038A1 - Antenna - Google Patents

Antenna Download PDF

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Publication number
WO2001028038A1
WO2001028038A1 PCT/DE2000/001400 DE0001400W WO0128038A1 WO 2001028038 A1 WO2001028038 A1 WO 2001028038A1 DE 0001400 W DE0001400 W DE 0001400W WO 0128038 A1 WO0128038 A1 WO 0128038A1
Authority
WO
WIPO (PCT)
Prior art keywords
antenna
meander
diode
feed point
antenna according
Prior art date
Application number
PCT/DE2000/001400
Other languages
German (de)
French (fr)
Inventor
Jan Bollenbeck
Peter Pfann
Original Assignee
Siemens Aktiengesellschaft
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 Aktiengesellschaft filed Critical Siemens Aktiengesellschaft
Publication of WO2001028038A1 publication Critical patent/WO2001028038A1/en

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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
    • H01Q9/06—Details
    • H01Q9/14—Length of element or elements adjustable
    • 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
    • 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
    • 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
    • H01Q9/06—Details
    • H01Q9/14—Length of element or elements adjustable
    • H01Q9/145—Length of element or elements adjustable by varying the electrical length
    • 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
    • H01Q9/40—Element having extended radiating surface

Definitions

  • the invention relates to an antenna according to the preamble of patent claim 1.
  • Radio systems in particular obile telephones, which send and receive radio signals within a broad frequency spectrum or several broad frequency spectra, require either broadband (multiband) antennas, or antennas with variable resonance frequency or variable adaptation.
  • Such antennas are referred to as multiband or broadband antennas and are used in particular in mobile telephones which use a frequency hopping method (frequency hopping) for transmitting and receiving radio signals.
  • antennas which, due to their structure, i.e. their spatial shape, have a resonance in several frequency bands.
  • Multiband mobile phones which are suitable for example for GSM (Global System for Mobile Communications) and for DECT (Digital Enhanced Cordless Telephone), often have two antennas due to the different transmission and reception frequencies of GSM and DECT. According to the currently active frequency band for sending and receiving, the corresponding antenna is switched over.
  • GSM Global System for Mobile Communications
  • DECT Digital Enhanced Cordless Telephone
  • an antenna which is suitable for a mobile phone which covers a wide transmission or reception range.
  • the antenna has an impedance matching circuit, which is preferably between the feed line and antenna is arranged.
  • the matching circuit has little ⁇ least a parallel circuit of at least one passive component and a switching element, in particular a diode on. Capacitors or inductors are preferably used as passive components.
  • the impedance matching of the antenna can be changed by switching the PIN diode.
  • the passive component or components are bridged by switching the switching element on or off.
  • the antenna is preferably built on a printed circuit board and is therefore suitable for space-saving installation in a mobile phone.
  • the invention has for its object to provide an antenna which is particularly suitable for multiband operation and which has a simple, space-saving and inexpensive structure. This object is achieved by an antenna with the features of claim 1. Preferred embodiments of the antenna are the subject of the dependent claims.
  • the antenna according to the invention has a radiating element which comprises a large number of turns or meanders. At least one turn or a meander can be bridged by means of a switch to set the resonance frequency of the antenna.
  • An essential idea of the invention is the adaptability of the "electrical length" of the antenna.
  • the resonance frequency of the antenna can thereby be changed.
  • the bridging of the winding (s) or meander of the radiating element is preferably carried out in the "current belly" of the antenna. Because of the windings or meanders, bridging of the same is very simple in comparison to, for example, a mechanical change in the length of an antenna. Furthermore, this antenna is very space-saving, for example for use in a mobile phone.
  • a suitable design of the antenna enables an external impedance fit the same unnecessarily, which can also reduce possible losses.
  • the resonance frequency of the antenna according to the invention is switched electronically and therefore very quickly in comparison to a mechanical change in the antenna length. By switching to a different resonance frequency, a narrow-band radiator element is also sufficient for multi-band operation of the antenna. The increased selectivity of the antenna can be exploited in the system design by reducing the filter effort in the transmission or reception path.
  • the radiator element is preferably applied to a printed circuit board. Especially when the antenna according to the invention is used in a mobile phone, this embodiment proves to be very advantageous, since there is limited space and there is insufficient space for a complex antenna structure.
  • the radiator element can, for example, be applied to the back of a circuit board already present in the mobile phone.
  • the turn or meander closest to a feed point of the radiator element can be bridged.
  • a winding or a meander is preferably bridged by a PIN diode.
  • the PIN diode is very suitable as a fast high-frequency switch.
  • the anode of the PIN diode is connected to the feed point and its cathode is connected to a point of the turn or the meander opposite the feed point.
  • a capacitance which is connected in series with the meander, prevents a DC short-circuit of the diode.
  • the switching voltage can be applied to the anode of the diode via the feed point.
  • the cathode is connected to ground potential via an HF choke for DC voltage.
  • the diode current is preferably set via a series resistor.
  • Fig. 1 is a schematic representation of the antenna according to the invention.
  • a radiator element 10, which has a plurality of meanders 11, is designed as a conductor track on a printed circuit board (PCB: P ⁇ nted Circuit Board), not shown.
  • the radiator element 10 can also be designed as a wire-shaped element, for example.
  • a design on a printed circuit board is advantageous for confined spaces such as in a mobile phone or cordless telephone, since printed circuit boards are usually already present in them and the radiator element can, for example, be additionally integrated with electronic components on such a printed circuit board.
  • This embodiment is also very inexpensive and simple to manufacture, in particular in contrast to mechanically changeable antennas.
  • the radiating element 10 shown is designed for triple-band operation of the antenna, i.e. it enables the antenna to operate within three different frequency bands. Without additional wiring, the radiator element 10 has two ⁇ / 4 resonance frequencies due to the special shape of the radiator or the meanders. The radiator element 10 is fed in the "current belly" at an infeed point 51.
  • the feed point 51 is connected via a capacitance 22 to the inner conductor of a coaxial line 30, the outer conductor of which, ie the shield, is connected to earth 40.
  • the coaxial line 30 serves on the one hand to connect the antenna to a transceiver circuit and not shown on the other hand as a supply of the diode switching voltage. This enables, for example, remote-controlled switching of the antenna resonance via the transceiver circuit.
  • the switchover itself takes place by “short-circuiting” the series connection of capacitance 22 and a meander 12 by means of a PIN diode 21.
  • the cathode of the PIN diode 21 is connected to the end point 50 of the bridgeable meander 12 opposite the feed point 51.
  • a direct current path to earth 40 is implemented via a first inductor 20.
  • the AC resistance of the first inductor 20 increases with the frequency of the AC current and blocks the connection of the end point 50 to the earth 40 for high frequencies, in particular for the useful frequency bands.
  • the diode switching voltage is supplied via an RF decoupling network consisting of a second inductor 24 and a second capacitor 23.
  • the capacitance 22 connected in series with the meander prevents a DC short circuit of the diode 21.
  • Switching voltage can be applied to the anode of the diode 21 via the feed point.
  • a negative direct voltage switching voltage
  • switching voltage can be applied to the PIN diode 21.
  • a third capacitance 26 finally serves as a DC block in the direction of the transceiver.

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Transceivers (AREA)

Abstract

The invention relates to an antenna. The radiator element of the antenna is provided with a plurality of windings or meanders. At least one winding or meander can be short-circuited by means of an electronic switch for adjusting the resonance frequency of the antenna. The antenna is constructed in a simple manner, preferably on a printed circuit board, and can thus be produced in a cost-effective manner.

Description

Beschreibungdescription
Antenneantenna
Die Erfindung betrifft eine Antenne gemäß dem Oberbegriff von Patentanspruch 1.The invention relates to an antenna according to the preamble of patent claim 1.
Funkanlagen, insbesondere obiltelefone, die innerhalb eines breiten Frequenzspektrums oder mehrerer breiter Frequenzspek- tren Funksignale senden und empfangen, benotigen entweder breitbandige (Multiband-) Antennen, oder Antennen mit veränderbarer Resonanzfrequenz oder veränderbarer Anpassung. Solche Antennen werden als Multiband- oder Breitband-Antennen bezeichnet und kommen insbesondere bei Mobiltelefonen, die mit einem Frequenzsprungverfahren (Frequency-Hoppmg) zum Senden und Empfangen von Funksignalen arbeiten, zur Anwendung.Radio systems, in particular obile telephones, which send and receive radio signals within a broad frequency spectrum or several broad frequency spectra, require either broadband (multiband) antennas, or antennas with variable resonance frequency or variable adaptation. Such antennas are referred to as multiband or broadband antennas and are used in particular in mobile telephones which use a frequency hopping method (frequency hopping) for transmitting and receiving radio signals.
Bekannt ist beispielsweise die Verwendung von Antennen, die aufgrund ihrer Struktur, d.h. ihrer räumlichen Gestalt, in mehreren Frequenzbandern eine Resonanz aufweisen.For example, it is known to use antennas which, due to their structure, i.e. their spatial shape, have a resonance in several frequency bands.
Es ist auch bekannt, mehrere Antennen zu verwenden, die in Abhängigkeit von der Frequenz eines Funksignals mittels Mul- tiplexern umgeschaltet werden. Multiband-Mobiltelefone, die beispielsweise für GSM (Global System for Mobile Communications) und für DECT (Digital Enhanced Cordless Telephone) geeignet sind, weisen häufig zwei Antennen aufgrund der unterschiedlichen Sende- und Empfangsfrequenzen von GSM und DECT auf. Entsprechend dem gerade aktiven Frequenzband zum Senden und Empfangen wird auf die entsprechende Antenne umgeschaltet.It is also known to use a plurality of antennas which are switched as a function of the frequency of a radio signal by means of multiplexers. Multiband mobile phones, which are suitable for example for GSM (Global System for Mobile Communications) and for DECT (Digital Enhanced Cordless Telephone), often have two antennas due to the different transmission and reception frequencies of GSM and DECT. According to the currently active frequency band for sending and receiving, the corresponding antenna is switched over.
Aus der EP 0 869 579 AI ist eine Antenne bekannt, die für ein Mobiltelefon geeignet ist, das einen breiten Sende- bzw. Empfangsbereich überstreicht. Dazu weist die Antenne eine Impedanzanpaßschaltung auf, die vorzugsweise zwischen Zuleitung und Antenne angeordnet ist. Die AnpaßSchaltung weist wenig¬ stens eine Parallelschaltung mindestens eines passiven Bauelementes und eines Schaltelementes, insbesondere einer Diode, auf. Als passive Bauelemente werden vorzugsweise Kapa- zitäten oder Induktivitäten verwendet. Durch das Schalten der PIN-Diode ist die Impedanzanpassung der Antenne veränderbar. Dazu wird bzw. werden durch ein An- oder Abschalten des Schaltelementes das oder die passiven Bauelemente überbrückt. Vorzugsweise wird die Antenne auf einer gedruckten Leiter- platte aufgebaut und ist dadurch für einen platzsparenden Einbau in ein Mobiltelefon geeignet.From EP 0 869 579 AI an antenna is known which is suitable for a mobile phone which covers a wide transmission or reception range. For this purpose, the antenna has an impedance matching circuit, which is preferably between the feed line and antenna is arranged. The matching circuit has little ¬ least a parallel circuit of at least one passive component and a switching element, in particular a diode on. Capacitors or inductors are preferably used as passive components. The impedance matching of the antenna can be changed by switching the PIN diode. For this purpose, the passive component or components are bridged by switching the switching element on or off. The antenna is preferably built on a printed circuit board and is therefore suitable for space-saving installation in a mobile phone.
Der Erfindung liegt die Aufgabe zugrunde, eine insbesondere für einen Multiband-Betrieb geeignete Antenne zu schaffen, die eine einfache, platzsparende und kostengünstige Struktur aufweist. Diese Aufgabe wird durch eine Antenne mit den Merkmalen von Patentanspruch 1 gelöst. Bevorzugte Ausführungsformen der Antenne sind Gegenstand der abhängigen Patentansprüche .The invention has for its object to provide an antenna which is particularly suitable for multiband operation and which has a simple, space-saving and inexpensive structure. This object is achieved by an antenna with the features of claim 1. Preferred embodiments of the antenna are the subject of the dependent claims.
Die erfindungsgemäße Antenne weist ein Strahlerelement auf, das eine Vielzahl von Windungen bzw. Mäander umfaßt. Mindestens eine Windung bzw. ein Mäander ist zur Einstellung der Resonanzfrequenz der Antenne mittels eines Schalters über- brückbar.The antenna according to the invention has a radiating element which comprises a large number of turns or meanders. At least one turn or a meander can be bridged by means of a switch to set the resonance frequency of the antenna.
Ein wesentlicher Gedanke der Erfindung ist die Anpaßbarkeit der "elektrischen Länge" der Antenne. Dadurch ist insbesondere die Resonanzfrequenz der Antenne veränderbar. Die Uber- brückung des oder der Windung (en) bzw. Mäander des Strahlerelements erfolgt vorzugsweise im "Strombauch" der Antenne. Aufgrund der Windungen bzw. Mäander ist eine Uberbrückung derselben im Vergleich zu beispielsweise einer mechanischen Veränderung der Länge einer Antenne sehr einfach ausführbar. Ferner ist diese Antenne sehr platzsparend zum Beispiel für den Einsatz in einem Mobiltelefon aufbaubar. Durch eine geeignete Auslegung der Antenne wird eine externe Impedanzan- passung derselben unnötig, wodurch sich zudem mögliche Verluste verringern lassen. Die Umschaltung der Resonanzfrequenz der erfindungsgemäßen Antenne erfolgt elektronisch und damit im Vergleich zu einer mechanischen Veränderung der Antennenlänge sehr schnell. Durch die Umschaltung auf eine andere Resonanzfrequenz ist zudem ein schmalbandiges Strahlerelement für einen Multiband-Betrieb der Antenne ausreichend. Die erhöhte Selektivität der Antenne kann bei der Systemauslegung durch verminderten Filteraufwand im Sende- bzw. Empfangspfad ausgenutzt werden.An essential idea of the invention is the adaptability of the "electrical length" of the antenna. In particular, the resonance frequency of the antenna can thereby be changed. The bridging of the winding (s) or meander of the radiating element is preferably carried out in the "current belly" of the antenna. Because of the windings or meanders, bridging of the same is very simple in comparison to, for example, a mechanical change in the length of an antenna. Furthermore, this antenna is very space-saving, for example for use in a mobile phone. A suitable design of the antenna enables an external impedance fit the same unnecessarily, which can also reduce possible losses. The resonance frequency of the antenna according to the invention is switched electronically and therefore very quickly in comparison to a mechanical change in the antenna length. By switching to a different resonance frequency, a narrow-band radiator element is also sufficient for multi-band operation of the antenna. The increased selectivity of the antenna can be exploited in the system design by reducing the filter effort in the transmission or reception path.
Vorzugsweise ist das Strahlerelement auf einer gedruckten Leiterplatte aufgebracht. Gerade bei einer Anwendung der erfindungsgemäßen Antenne in einem Mobiltelefon erweist sich diese Ausführungsform als sehr vorteilhaft, da dort beengte Platzverhältnisse vorherrschen und für eine aufwendige Antennenstruktur nicht ausreichend Platz vorhanden ist. Das Strahlerelement kann beispielsweise auf der Rückseite einer bereits im Mobiltelefon vorhandenen Leiterplatte aufgebracht werden.The radiator element is preferably applied to a printed circuit board. Especially when the antenna according to the invention is used in a mobile phone, this embodiment proves to be very advantageous, since there is limited space and there is insufficient space for a complex antenna structure. The radiator element can, for example, be applied to the back of a circuit board already present in the mobile phone.
Ferner ist die bzw. der einem Einspeisepunkt des Strahlerelements am nächsten liegende Windung bzw. Mäander überbrückbar.Furthermore, the turn or meander closest to a feed point of the radiator element can be bridged.
Eine Windung bzw. ein Mäander wird bevorzugt durch eine PIN- Diode überbrückt. Die PIN-Diode eignet sich bekanntermaßen sehr gut als schneller Hochfrequenzschalter. Die Anode der PIN-Diode ist mit dem Einspeisepunkt und deren Kathode ist mit einem dem Einspeisepunkt gegenüberliegenden Punkt der Windung bzw. des Mäanders verbunden. Eine Kapazität, die in Serie mit dem Mäander geschaltet ist, verhindert einen DC- Kurzschluß der Diode. Die Schaltspannung kann über den Einspeisepunkt auf die Anode der Diode gelegt werden. Die Ka- thode ist über eine HF-Drossel für Gleichspannung auf Massepotential gelegt. Vorzugsweise wird der Diodenstrom über einen Vorwiderstand eingestellt.A winding or a meander is preferably bridged by a PIN diode. As is known, the PIN diode is very suitable as a fast high-frequency switch. The anode of the PIN diode is connected to the feed point and its cathode is connected to a point of the turn or the meander opposite the feed point. A capacitance, which is connected in series with the meander, prevents a DC short-circuit of the diode. The switching voltage can be applied to the anode of the diode via the feed point. The cathode is connected to ground potential via an HF choke for DC voltage. The diode current is preferably set via a series resistor.
Eine bevorzugte Ausführungsform wird nachfolgend anhand einer Zeichnung beschrieben. Dabei zeigtA preferred embodiment is described below with reference to a drawing. It shows
Fig. 1 eine schematische Darstellung der erfmdungsgemaßen Antenne .Fig. 1 is a schematic representation of the antenna according to the invention.
Ein Strahlerelement 10, das mehrere Mäander 11 aufweist, ist als Leiterbahn auf einer nicht dargestellten gedruckten Leiterplatte (PCB: Pπnted Circuit Board) ausgebildet. Das Strahlerelement 10 kann beispielsweise auch als drahtformiges Element ausgebildet sein. Eine Ausfuhrung auf einer gedruck- ten Leiterplatte ist allerdings für beengte Platzverhaltnisse wie in einem Mobiltelefon oder Schnurlos-Telefon vorteilhaft, da in diesen meistens bereits gedruckte Leiterplatten vorhanden sind und auf einer solchen gedruckten Leiterplatte beispielsweise das Strahlerelement zusatzlich mit elektronischen Komponenten integriert werden kann. Diese Ausfuhrung ist zudem sehr kostengünstig und einfach m der Herstellung insbesondere im Gegensatz zu mechanisch veränderbaren Antennen.A radiator element 10, which has a plurality of meanders 11, is designed as a conductor track on a printed circuit board (PCB: Pπnted Circuit Board), not shown. The radiator element 10 can also be designed as a wire-shaped element, for example. However, a design on a printed circuit board is advantageous for confined spaces such as in a mobile phone or cordless telephone, since printed circuit boards are usually already present in them and the radiator element can, for example, be additionally integrated with electronic components on such a printed circuit board. This embodiment is also very inexpensive and simple to manufacture, in particular in contrast to mechanically changeable antennas.
Das dargestellte Strahlerelement 10 ist für einen Tripleband- Betrieb der Antenne ausgelegt, d.h. es ermöglicht einen Betrieb der Antenne innerhalb von drei verschiedenen Frequenzbandern. Ohne zusätzliche Beschaltung weist das Strahlerelement 10 zwei λ/4-Resonanzfrequenzen aufgrund der besonderen Form des Strahlers bzw. der Mäander auf. Die Speisung des Strahlerelements 10 erfolgt hierbei im "Strombauch" an einem Einspeisepunkt 51.The radiating element 10 shown is designed for triple-band operation of the antenna, i.e. it enables the antenna to operate within three different frequency bands. Without additional wiring, the radiator element 10 has two λ / 4 resonance frequencies due to the special shape of the radiator or the meanders. The radiator element 10 is fed in the "current belly" at an infeed point 51.
Der Einspeisepunkt 51 ist hierzu über eine Kapazität 22 mit dem Innenleiter einer Koaxialleitung 30 verbunden, deren Au- ßenleiter, d.h. die Abschirmung, mit Erde 40 verbunden ist. Die Koaxialleitung 30 dient einerseits zum Verbinden der Antenne mit einer nicht dargestellten Transceiverschaltung und andererseits als Zufuhrung der Dioden-Schaltspannung. Hierdurch wird beispielsweise eine ferngesteuerte Umschaltung der Antennenresonanz über die Transceiverschaltung ermöglicht.For this purpose, the feed point 51 is connected via a capacitance 22 to the inner conductor of a coaxial line 30, the outer conductor of which, ie the shield, is connected to earth 40. The coaxial line 30 serves on the one hand to connect the antenna to a transceiver circuit and not shown on the other hand as a supply of the diode switching voltage. This enables, for example, remote-controlled switching of the antenna resonance via the transceiver circuit.
Die Umschaltung selbst erfolgt durch "Kurzschließen" der Se- rienschaltung von Kapazität 22 und eines Mäanders 12 mittels einer PIN-Diode 21.The switchover itself takes place by “short-circuiting” the series connection of capacitance 22 and a meander 12 by means of a PIN diode 21.
Die Kathode der PIN-Diode 21 ist mit dem dem Einspeisepunkt 51 gegenüberliegenden Endpunkt 50 des uberbruckbaren Mäanders 12 verbunden. Über eine erste Induktivität 20 wird ein Gleichstrompfad nach Erde 40 realisiert. Der Wechselstromwiderstand der ersten Induktivität 20 steigt mit der Frequenz des Wechselstroms und sperrt für hohe Frequenzen insbesondere für die Nutzfrequenzbander, die Verbindung des Endpunkts 50 zur Erde 40.The cathode of the PIN diode 21 is connected to the end point 50 of the bridgeable meander 12 opposite the feed point 51. A direct current path to earth 40 is implemented via a first inductor 20. The AC resistance of the first inductor 20 increases with the frequency of the AC current and blocks the connection of the end point 50 to the earth 40 for high frequencies, in particular for the useful frequency bands.
Am Einspeisepunkt des Koaxialkabels 30 wird über ein HF-Entkopplungsnetzwerk, bestehend aus einer zweiten Induktivität 24 und einer zweiten Kapazität 23, die Diodenschaltspannung zugeführt. Ein Widerstand 25, der mit dem Verbindungspunkt der zweiten Induktivität 24 und der zweiten Kapazität 26 verbunden ist, dient zur Einstellung des Diodenstroms der PIN- Diode 21. Die in Serie mit dem Mäander geschaltete Kapazität 22 verhindert einen DC-Kurzschluß der Diode 21. DieAt the feed point of the coaxial cable 30, the diode switching voltage is supplied via an RF decoupling network consisting of a second inductor 24 and a second capacitor 23. A resistor 25, which is connected to the connection point of the second inductance 24 and the second capacitance 26, serves to adjust the diode current of the PIN diode 21. The capacitance 22 connected in series with the meander prevents a DC short circuit of the diode 21. The
Schaltspannung kann über den Einspeisepunkt auf die Anode der Diode 21 gelegt werden. Um die Entstehung von Verzerrungen bei größeren Sendeleistungen zu vermindern, kann an die PIN- Diode 21 eine negative Gleichspannung (Schaltspannung) an- gelegt werden.Switching voltage can be applied to the anode of the diode 21 via the feed point. In order to reduce the occurrence of distortions in the case of larger transmission powers, a negative direct voltage (switching voltage) can be applied to the PIN diode 21.
Eine dritte Kapazität 26 dient schließlich als DC-Block in Richtung Transceiver. A third capacitance 26 finally serves as a DC block in the direction of the transceiver.

Claims

Patentansprüche claims
1. Antenne, deren Strahlerelement (10) eine Vielzahl von Windungen bzw. Mäander (11, 12) aufweist, dadurch gekennzeichnet, daß mindestens eine Windung bzw. ein Mäander (11, 12) mittels eines elektronischen Schalters (21, 22) zur Einstellung der Resonanzfrequenz der Antenne überbrückbar ist.1. antenna, the radiating element (10) has a plurality of turns or meanders (11, 12), characterized in that at least one turn or a meander (11, 12) by means of an electronic switch (21, 22) for adjustment the resonance frequency of the antenna can be bridged.
2. Antenne nach Anspruch 1, dadurch gekennzeichnet, daß das Strahlerelement (10) auf einer gedruckten Leiterplatte aufgebracht ist.2. Antenna according to claim 1, characterized in that the radiating element (10) is applied to a printed circuit board.
3. Antenne nach einem der vorhergehenden Ansprüche, da- durch gekennzeichnet, daß die bzw. der einem Einspeisepunkt (51) des Strahlerelements (10) am nächsten liegende Windung bzw. Mäander überbrückbar ist.3. Antenna according to one of the preceding claims, characterized in that the winding or meander lying closest to a feed point (51) of the radiating element (10) can be bridged.
4. Antenne nach Anspruch 3, dadurch gekennzeich- net, daß zur Uberbrückung einer Windung bzw. eines Mäanders eine PIN-Diode (21) vorgesehen ist, deren Anode mit dem Einspeisepunkt (51) und deren Kathode mit einem dem Einspeisepunkt (51) gegenüberliegenden Endpunkt (50) der Windung bzw. des Mäander (12) verbunden ist.4. Antenna according to claim 3, characterized in that a PIN diode (21) is provided for bridging a turn or a meander, the anode of which is connected to the feed point (51) and the cathode of which is opposite the feed point (51) End point (50) of the turn or the meander (12) is connected.
5. Antenne nach Anspruch 4, dadurch gekennzeichnet, daß der Diodenstrom über einen Widerstand (25), der die Anode der PIN-Diode (21) mit einer Spannung verbindet, eingestellt wird. 5. Antenna according to claim 4, characterized in that the diode current is set via a resistor (25) which connects the anode of the PIN diode (21) to a voltage.
PCT/DE2000/001400 1999-10-12 2000-05-03 Antenna WO2001028038A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19949183 1999-10-12
DE19949183.6 1999-10-12

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WO2001028038A1 true WO2001028038A1 (en) 2001-04-19

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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2849288A1 (en) * 2002-12-23 2004-06-25 Socapex Amphenol Broadband antenna for mobile radio telephone, has two conductive surfaces lying in same geometrical surface of non-closed curvilinear shape, where one surface has metallization that is coupled to ground of transceiver module
WO2004102737A1 (en) * 2003-05-16 2004-11-25 Philips Intellectual Property & Standards Gmbh Switchable multiband antenna for the high-frequency and microwave range
EP1858115A1 (en) * 2006-05-19 2007-11-21 AMC Centurion AB Antenna device and portable radio communication device comprising such an antenna device
DE102012219263A1 (en) * 2011-10-20 2013-07-04 Htc Corporation Handheld and planar antenna thereof

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US5754143A (en) * 1996-10-29 1998-05-19 Southwest Research Institute Switch-tuned meandered-slot antenna
EP0869579A1 (en) * 1997-04-01 1998-10-07 Murata Manufacturing Co., Ltd. Antenna device

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5754143A (en) * 1996-10-29 1998-05-19 Southwest Research Institute Switch-tuned meandered-slot antenna
EP0869579A1 (en) * 1997-04-01 1998-10-07 Murata Manufacturing Co., Ltd. Antenna device

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2849288A1 (en) * 2002-12-23 2004-06-25 Socapex Amphenol Broadband antenna for mobile radio telephone, has two conductive surfaces lying in same geometrical surface of non-closed curvilinear shape, where one surface has metallization that is coupled to ground of transceiver module
WO2004059788A1 (en) * 2002-12-23 2004-07-15 Amphenol Socapex Small-volume antenna, in particular for portable telephones
US6927731B2 (en) 2002-12-23 2005-08-09 Amphenol Socapex Antenna of small volume for a portable radio appliance
WO2004102737A1 (en) * 2003-05-16 2004-11-25 Philips Intellectual Property & Standards Gmbh Switchable multiband antenna for the high-frequency and microwave range
EP1858115A1 (en) * 2006-05-19 2007-11-21 AMC Centurion AB Antenna device and portable radio communication device comprising such an antenna device
US8144071B2 (en) 2006-05-19 2012-03-27 Anders Thornell-Pers Antenna device and portable radio communication device comprising such an antenna device
DE102012219263A1 (en) * 2011-10-20 2013-07-04 Htc Corporation Handheld and planar antenna thereof
US9240627B2 (en) 2011-10-20 2016-01-19 Htc Corporation Handheld device and planar antenna thereof
DE102012219263B4 (en) * 2011-10-20 2020-03-12 Htc Corporation Handheld device and planar antenna thereof

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