EP0616734B1 - Cordless communication terminal, especially for cordless telephone - Google Patents

Cordless communication terminal, especially for cordless telephone Download PDF

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Publication number
EP0616734B1
EP0616734B1 EP92923759A EP92923759A EP0616734B1 EP 0616734 B1 EP0616734 B1 EP 0616734B1 EP 92923759 A EP92923759 A EP 92923759A EP 92923759 A EP92923759 A EP 92923759A EP 0616734 B1 EP0616734 B1 EP 0616734B1
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EP
European Patent Office
Prior art keywords
antenna
cordless
antenna conductor
cordless telecommunication
telecommunication terminal
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.)
Expired - Lifetime
Application number
EP92923759A
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German (de)
French (fr)
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EP0616734A1 (en
Inventor
Josef Rasinger
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Siemens AG Oesterreich
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Siemens AG Oesterreich
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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
    • 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
    • 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
    • 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 invention relates to a cordless telecommunications terminal, in particular a cordless telephone according to the preamble of patent claim 1.
  • Cordless telecommunications terminals such as. B. cordless phones, mobile phones, etc.
  • Inverted-F antennas the dimensions of which essentially result from the predetermined resonance frequencies, have proven to be suitable for use in such cordless telecommunication terminals.
  • Such antennas are e.g. B. from the publication: "Small Antennas" by K. Fujimoto, A. Henderson, K. Hirasawa and J.R. James; Research Studies Press LTD, 1987, pages 116-151.
  • Dipole antennas are described in the publication "IEEE Transactions on Antennas and Propagation, Vol. AP-32, No. 4, April 1984, pages 385 and 386, which, to shorten the axial length, are either zigzag (FIG. 1) or meandering ( Figure 5) are formed.
  • the radiators of the direction finder system are each designed as an electrical conductor running in two or three-dimensional deflections around the vertical axis, for example as a spiral radiator or as a meandering electrical conductor.
  • the meander embodiment is included preferably carried out as a printed strip line on an insulating carrier material.
  • the object on which the invention is based is to compactly design a cordless telecommunications terminal, in particular a cordless telephone.
  • an antenna arrangement can be realized which, compared to a conventional inverted-F antenna and with essentially constant electrical properties, has a significantly shorter length extension.
  • the antenna can be integrated into the housing, so that in particular the antenna components which are outstanding in known devices are better protected against damage.
  • the integration of the antenna arrangement in the cordless telecommunications terminal is facilitated in that the plane in which the meandering part of the antenna conductor runs is at least approximately parallel to the base plate (simpler dimensioning of the antenna).
  • the compact structure of the cordless telecommunications device is further improved in that the antenna arrangement is flat, that is, the distance from the antenna conductor to the base plate (overall height of the antenna) is small.
  • the antenna conductor is made of wire.
  • a wire construction known per se offers itself especially with small production quantities, since the assembly can be done quickly and easily.
  • the antenna conductor is made from sheet metal in a manner known per se.
  • a sheet metal antenna can be punched by machine and then bent. This solution is particularly advantageous for large quantities and high manufacturing automation.
  • the antenna conductor consists of plastic with a conductive coating, as a result of which the antenna can be manufactured in one operation with the plastic housing.
  • the antenna conductor is designed in a known manner using printed circuit technology. This favors the automated production of large quantities.
  • the exemplary antenna shown in Figure 1 consists of 0.3 mm thick sheet brass, which is shaped according to the representation A of the figure and bent according to the representations B and C.
  • the length of the antenna according to the invention is only 56.5 cm, which makes it possible to install it in the plastic housing of a very compact cordless telephone.
  • FIG. 2 shows the calculated input impedance of the antenna according to FIG. 1 between a start frequency f s of 850 MHz and an end frequency f e of 1300 MHz with measured values at a distance of 25 MHz each.
  • the form of presentation is a Smith chart as it is, for example, in the Telefunken laboratory book, volume 2; 2nd edition, 1962.
  • the impedance values were normalized to 50 ohms.
  • the area with a standing wave ratio VSWR ⁇ 2 is identified by a circle K.
  • the impedance values for frequencies of approximately 940 MHz to 990 MHz lie within this circle.
  • the relative dielectric constant of the antenna effectively extends the antenna by reducing the speed of light, as a result of which a range of approximately 910 MHz to 960 MHz lies within the circle K.
  • the antenna thus meets the requirements for an antenna for a cordless telephone described above.
  • FIG. 3 shows the radiation characteristic of an antenna according to FIG. 1 in three diagrams.
  • the position of the three display planes yz, zx, xy relative to the antenna is identified in illustrations B and C of FIG.
  • the values of the two components E ⁇ and E ⁇ of the electric field strength vector are shown in one point on a spherical surface.
  • ⁇ is the angle between the zx plane and the plane determined by the z axis and the point on the spherical surface, to which the field component E ⁇ is perpendicular.
  • ⁇ is the angle between the z-axis and the pointer from the origin of the coordinate system to the point on the surface of the sphere.
  • the second field component E ⁇ is perpendicular to this pointer in the plane determined by the point and the z-axis.
  • the two curves then each show the field components E ⁇ and E ⁇ related to the ideal isotropic emitter in the 3 main planes yz, zx and xy of the coordinate system.

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Support Of Aerials (AREA)
  • Mobile Radio Communication Systems (AREA)
  • Waveguide Aerials (AREA)
  • Telephone Set Structure (AREA)
  • Details Of Aerials (AREA)

Abstract

The invention relates to an aerial arrangement, especially for communications terminals. The need for compact construction of the communications terminals makes it difficult to integrate aerials into their casings. The aerial arrangement of the invention is notably shorter than prior art aerials and can thus be particularly easily integrated. This is achieved by the approximately zig-zag folding of the long section of an "inverted F aerial".

Description

Die Erfindung betrifft ein Schnurlos-Telekommunikationsendgerät, insbesondere ein Schnurlos-Telefon gemäß dem Oberbegriff des Patentanspruches 1.The invention relates to a cordless telecommunications terminal, in particular a cordless telephone according to the preamble of patent claim 1.

Schnurlos-Telekommunikationsendgeräte, wie z. B. Schnurlos-Telefone, Mobilfunkgeräte etc., benötigen für die schnurlose Nachrichtenübertragung im MHz- oder GHz-Frequenzbereich Antennen. Für den Einsatz in solchen Schnurlos-Telekommunikationsendgeräten haben sich insbesondere Inverted-F-Antennen als geeignet erwiesen, deren Abmessungen sich im wesentlichen aus den vorgegebenen Resonanzfrequenzen ergeben. Derartige Antennen sind z. B. aus der Druckschrift: "Small Antennas" von K. Fujimoto, A. Henderson, K. Hirasawa und J. R. James; Research Studies Press LTD, 1987, Seiten 116 bis 151 bekannt.Cordless telecommunications terminals, such as. B. cordless phones, mobile phones, etc., require antennas for wireless message transmission in the MHz or GHz frequency range. Inverted-F antennas, the dimensions of which essentially result from the predetermined resonance frequencies, have proven to be suitable for use in such cordless telecommunication terminals. Such antennas are e.g. B. from the publication: "Small Antennas" by K. Fujimoto, A. Henderson, K. Hirasawa and J.R. James; Research Studies Press LTD, 1987, pages 116-151.

Aus der Druckschrift "IEEE Transactions on Antennas and Propagation, Vol. AP-32, Nr. 4, April 1984, Seiten 385 und 386 sind Dipol-Antennen beschrieben, die zur Verkürzung der axialen Länge entweder zickzack- (Figur 1) oder mäanderförmig (Figur 5) ausgebildet sind.Dipole antennas are described in the publication "IEEE Transactions on Antennas and Propagation, Vol. AP-32, No. 4, April 1984, pages 385 and 386, which, to shorten the axial length, are either zigzag (FIG. 1) or meandering ( Figure 5) are formed.

Aus der DE-A1-31 29 045 ist ein Peilantennensystem unter Verwendung von Vertikalstrahlern mit geringer Bauhöhe und Rundumempfangscharakteristik bekannt. Zur Erzielung einer geringen Bauhöhe bei noch ausreichender Antennenempfindlichkeit sind die Strahler der Peilanlage jeweils als ein in zwei- oder dreidimensionalen Auslenkungen um die Vertikalachse verlaufender elektrischer Leiter, beispielsweise als Wendelstrahler oder als ein mäanderförmig verlaufender elektrischer Leiter, ausgebildet. Die Mäander-Ausführungsform ist dabei vorzugsweise als gedruckte Streifenleitung auf einem isolierenden Trägermaterial ausgeführt.From DE-A1-31 29 045 a DF antenna system using vertical radiators with a low overall height and all-round reception characteristic is known. To achieve a low overall height with sufficient antenna sensitivity, the radiators of the direction finder system are each designed as an electrical conductor running in two or three-dimensional deflections around the vertical axis, for example as a spiral radiator or as a meandering electrical conductor. The meander embodiment is included preferably carried out as a printed strip line on an insulating carrier material.

Die der Erfindung zugrundeliegende Aufgabe besteht darin, ein Schnurlos-Telekommunikationsendgerät, insbesondere ein Schnurlos-Telefon kompakt aufzubauen.The object on which the invention is based is to compactly design a cordless telecommunications terminal, in particular a cordless telephone.

Diese Aufgabe wird ausgehend von dem im Oberbegriff des Patentanspruches 1 definierten Schnurlos-Telekommunikationsendgerät durch die in dem kennzeichnenden Teil des Patentanspruches 1 angegebenen Merkmale gelöst.This object is achieved on the basis of the cordless telecommunication terminal defined in the preamble of claim 1 by the features specified in the characterizing part of patent claim 1.

Dadurch, daß der lange Abschnitt des Antennenleiters zwischen der Speisestelle und dem freien Ende zumindest annähernd mäanderförmig gefaltet ist, ist eine Antennenanordnung realisierbar, die gegenüber einer herkömmlichen Inverted-F-Antenne und bei im wesentlichen gleichbleibenden elektrischen Eigenschaften eine deutlich verkürzte Längenausdehnung aufweist. Dadurch kann die Antenne in das Gehäuse integriert werden, so daß insbesondere die bei bekannten Geräten herausragenden Antennenkomponenten besser vor Beschädigungen geschützt sind.Due to the fact that the long section of the antenna conductor between the feed point and the free end is folded at least approximately in a meandering manner, an antenna arrangement can be realized which, compared to a conventional inverted-F antenna and with essentially constant electrical properties, has a significantly shorter length extension. As a result, the antenna can be integrated into the housing, so that in particular the antenna components which are outstanding in known devices are better protected against damage.

Die Integration der Antennenanordnung in das Schnurlos-Telekommunikationsendgerät wird dadurch erleichtert, daß die Ebene, in welcher der mäanderförmige Teil des Antennenleiters verläuft, zumindest annähernd parallel zur Grundplatte verläuft (einfachere Dimensionierung der Antenne).The integration of the antenna arrangement in the cordless telecommunications terminal is facilitated in that the plane in which the meandering part of the antenna conductor runs is at least approximately parallel to the base plate (simpler dimensioning of the antenna).

Darüber hinaus wird der kompakte Aufbau des Schnurlos-Telekommunikationsgerätes noch dadurch verbesssert, daß die Antennenanordnung flach ausgebildet ist, also der Abstand vom Antennenleiter zur Grundplatte (Bauhöhe der Antenne) klein ist.In addition, the compact structure of the cordless telecommunications device is further improved in that the antenna arrangement is flat, that is, the distance from the antenna conductor to the base plate (overall height of the antenna) is small.

Vorteilhaft ist es, wenn der Antennenleiter aus Draht gefertigt ist. Ein an sich bekannter Aufbau aus Draht bietet sich besonders bei kleinen Fertigungsstückzahlen an, da der Aufbau schnell und einfach erfolgen kann.It is advantageous if the antenna conductor is made of wire. A wire construction known per se offers itself especially with small production quantities, since the assembly can be done quickly and easily.

Günstig ist es, wenn der Antennenleiter in an sich bekannter Weise aus Blech gefertigt ist. Eine Antenne aus Blech kann maschinell gestanzt und anschließend gebogen werden. Diese Lösung ist besonders bei hohen Stückzahlen und hoher Automatisierung der Fertigung vorteilhaft.It is favorable if the antenna conductor is made from sheet metal in a manner known per se. A sheet metal antenna can be punched by machine and then bent. This solution is particularly advantageous for large quantities and high manufacturing automation.

Günstig ist es ferner, wenn der Antennenleiter aus leitend beschichtetem Kunststoff besteht, wodurch die Fertigung der Antenne in einem Arbeitsgang mit dem Kunststoffgehäuse ermöglicht wird.It is also expedient if the antenna conductor consists of plastic with a conductive coating, as a result of which the antenna can be manufactured in one operation with the plastic housing.

Vorteilhaft ist es weiterhin, wenn der Antennenleiter in an sich bekannter Weise in gedruckter Schaltungstechnik ausgeführt ist. Dadurch wird die automatisierte Fertigung hoher Stückzahlen begünstigt.It is also advantageous if the antenna conductor is designed in a known manner using printed circuit technology. This favors the automated production of large quantities.

Die Erfindung wird anhand von drei Figuren näher erläutert. Es zeigen:

  • Figur 1 ein Beispiel einer aus Messingblech gefertigten Antenne,
  • Figur 2 die Eingangsimpedanz einer Antenne nach Figur 1 in Abhängigkeit von der Frequenz und
  • Figur 3 die Feldverteilung im Fernfeld bei einer Antenne nach Figur 1.
The invention is explained in more detail with reference to three figures. Show it:
  • FIG. 1 shows an example of an antenna made from sheet brass,
  • 2 shows the input impedance of an antenna according to FIG. 1 as a function of the frequency and
  • 3 shows the field distribution in the far field with an antenna according to FIG. 1.

Die in Figur 1 dargestellte beispielhafte Antenne besteht aus 0,3 mm dickem Messingblech, das gemäß der Darstellung A der Figur geformt ist und gemäß den Darstellungen B und C gebogen ist.The exemplary antenna shown in Figure 1 consists of 0.3 mm thick sheet brass, which is shaped according to the representation A of the figure and bent according to the representations B and C.

Die dargestellte Antenne wurde für den Einsatz in einem Schnurlostelefon bemessen. Dazu ist eine Mittenfrequenz von ca. 932 MHz und eine Bandbreite von 45 MHz notwendig. Die Bandbreite ist definiert für ein Stehwellenverhältnis von VSWR ≦ 2. Für die Frequenz von 932 MHz beträgt λ/4 = 80 mm. Bei einer Bauhöhe der Antenne von 4 mm beträgt die Längenausdehnung L einer herkömmlichen Inverted-F-Antenne L = λ/4 - h = 80 - 4 = 76 mm.

Figure imgb0001
The antenna shown was dimensioned for use in a cordless telephone. This requires a center frequency of approx. 932 MHz and a bandwidth of 45 MHz. The bandwidth is defined for a standing wave ratio of VSWR ≦ 2. For the frequency of 932 MHz, λ / 4 = 80 mm. With an overall height of the antenna of 4 mm, the length dimension L of a conventional inverted-F antenna is L = λ / 4 - h = 80 - 4 = 76 mm.
Figure imgb0001

Im Gegensatz dazu beträgt die Längenausdehnung der erfindungsgemäßen Antenne lediglich 56,5 cm, wodurch der Einbau in das Kunststoffgehäuse eines sehr kompakten Schnurlostelefones möglich ist.In contrast, the length of the antenna according to the invention is only 56.5 cm, which makes it possible to install it in the plastic housing of a very compact cordless telephone.

Figur 2 zeigt die berechnete Eingangsimpedanz der Antenne nach Figur 1 zwischen einer Startfrequenz fs von 850 MHz und einer Endfrequenz fe von 1300 MHz mit Meßwerten im Abstand von jeweils 25 MHz. Die Darstellungsform ist ein Smith-Diagramm wie es beispielsweise im Telefunken-Laborbuch, Band 2; 2. Ausgabe, 1962 beschrieben ist. Die Impedanzwerte wurden auf 50 Ohm normiert. Der Bereich mit einem Stehwellenverhältnis VSWR ≦ 2 ist durch einen Kreis K gekennzeichnet.FIG. 2 shows the calculated input impedance of the antenna according to FIG. 1 between a start frequency f s of 850 MHz and an end frequency f e of 1300 MHz with measured values at a distance of 25 MHz each. The form of presentation is a Smith chart as it is, for example, in the Telefunken laboratory book, volume 2; 2nd edition, 1962. The impedance values were normalized to 50 ohms. The area with a standing wave ratio VSWR ≦ 2 is identified by a circle K.

Bei dem beschriebenen Beispiel liegen die Impedanzwerte für Frequenzen von ca. 940 MHz bis 990 MHz innerhalb dieses Kreises. Bei Einbau der Antenne in ein Kunststoffgehäuse bewirkt die relative Dielektrizitätskonstante desselben über die Verringerung der Lichtgeschwindigkeit eine effektive Verlängerung der Antenne, wodurch ein Bereich von etwa 910 MHz bis 960 MHz innerhalb des Kreises K liegt. Die Antenne entspricht somit den oben beschriebenen Anforderungen an eine Antenne für ein Schnurlostelefon.In the example described, the impedance values for frequencies of approximately 940 MHz to 990 MHz lie within this circle. When the antenna is installed in a plastic housing, the relative dielectric constant of the antenna effectively extends the antenna by reducing the speed of light, as a result of which a range of approximately 910 MHz to 960 MHz lies within the circle K. The antenna thus meets the requirements for an antenna for a cordless telephone described above.

Figur 3 zeigt in drei Diagrammen die Strahlungscharakteristik einer Antenne nach Figur 1. Die Lage der drei Darstellungsebenen yz, zx, xy zur Antenne ist in den Darstellungen B und C der Figur 1 gekennzeichnet. In den drei, bei Antennen üblichen, Darstellungen werden jeweils die Werte der beiden Komponenten Eφ und Eϑ des elektrischen Feldstärkevektors in einem Punkt auf einer Kugeloberfläche dargestellt.FIG. 3 shows the radiation characteristic of an antenna according to FIG. 1 in three diagrams. The position of the three display planes yz, zx, xy relative to the antenna is identified in illustrations B and C of FIG. In the three representations common to antennas, the values of the two components Eφ and Eϑ of the electric field strength vector are shown in one point on a spherical surface.

φ ist der Winkel zwischen der zx-Ebene und der durch die z-Achse und den Punkt auf der Kugeloberfläche bestimmten Ebene, auf welche die Feldkomponente Eφ senkrecht steht. ϑ ist der Winkel zwischen der z-Achse und dem Zeiger vom Ursprung des Koordinatensystems zu dem Punkt auf der Kugeloberfläche. Die zweite Feldkomponente Eϑ steht senkrecht auf diesen Zeiger in der durch Punkt und z-Achse bestimmten Ebene. Die beiden Kurven zeigen dann jeweils die auf den idealen Isotropstrahler bezogenen Feldkomponenten Eφ und Eϑ in den 3 Hauptebenen yz, zx und xy des Koordinatensystems.φ is the angle between the zx plane and the plane determined by the z axis and the point on the spherical surface, to which the field component Eφ is perpendicular. ϑ is the angle between the z-axis and the pointer from the origin of the coordinate system to the point on the surface of the sphere. The second field component Eϑ is perpendicular to this pointer in the plane determined by the point and the z-axis. The two curves then each show the field components Eφ and Eϑ related to the ideal isotropic emitter in the 3 main planes yz, zx and xy of the coordinate system.

Die Ergebnisse zeigen eine relativ gute Isotropieeigenschaft der Antenne, die somit auch in dieser Hinsicht den Anforderungen an Antennen für Schnurlostelefone entspricht.The results show a relatively good isotropy property of the antenna, which therefore also meets the requirements for antennas for cordless telephones in this regard.

Claims (5)

  1. Cordless telecommunication terminal, in particular cordless telephone, having an antenna arrangement which has an approximately L-shaped antenna conductor, whose short section (E) is connected at its free end to a baseplate arranged in the communication terminal, and whose long section (F) is provided, at a specific spacing from the bend of the antenna conductor, with a feed point (S), characterized in that
    a) the antenna arrangement is integrated into the cordless telecommunication device,
    b) the antenna arrangement is of flat design,
    c) the long section (F) of the antenna conductor, between the feed point (S) and the free end, is folded in an at least approximately serpentine shape and
    d) the plane, in which the serpentine part of the antenna conductor runs, runs at least approximately parallel to the baseplate.
  2. Cordless telecommunication terminal according to Claim 1, characterized in that the antenna conductor is produced from wire.
  3. Cordless telecommunication terminal according to Claim 1, characterized in that the antenna conductor is produced from sheet metal.
  4. Cordless telecommunication terminal according to Claim 1, characterized in that the antenna conductor comprises conductively coated plastic.
  5. Cordless telecommunication terminal according to Claim 1, characterized in that the antenna conductor is implemented in printed circuit technology.
EP92923759A 1991-12-11 1992-11-20 Cordless communication terminal, especially for cordless telephone Expired - Lifetime EP0616734B1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
AT0245991A AT396532B (en) 1991-12-11 1991-12-11 ANTENNA ARRANGEMENT, ESPECIALLY FOR COMMUNICATION TERMINALS
AT2459/91 1991-12-11
PCT/EP1992/002674 WO1993012559A1 (en) 1991-12-11 1992-11-20 Aerial arrangement, especially for communications terminals

Publications (2)

Publication Number Publication Date
EP0616734A1 EP0616734A1 (en) 1994-09-28
EP0616734B1 true EP0616734B1 (en) 1995-08-16

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AT (2) AT396532B (en)
DE (1) DE59203316D1 (en)
WO (1) WO1993012559A1 (en)

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DE19983824B8 (en) * 1998-12-16 2016-01-21 Telefonaktiebolaget Lm Ericsson (Publ) Surface patch antenna for multiple bands and communication device
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Also Published As

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DE59203316D1 (en) 1995-09-21
WO1993012559A1 (en) 1993-06-24
ATA245991A (en) 1993-01-15
ATE126629T1 (en) 1995-09-15
AT396532B (en) 1993-10-25
EP0616734A1 (en) 1994-09-28

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