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WO2000008712A1 - Multiband antenna - Google Patents

Multiband antenna

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Publication number
WO2000008712A1
WO2000008712A1 PCT/DE1999/002404 DE9902404W WO0008712A1 WO 2000008712 A1 WO2000008712 A1 WO 2000008712A1 DE 9902404 W DE9902404 W DE 9902404W WO 0008712 A1 WO0008712 A1 WO 0008712A1
Authority
WO
Grant status
Application
Patent type
Prior art keywords
antenna
frequency
element
elements
figure
Prior art date
Application number
PCT/DE1999/002404
Other languages
German (de)
French (fr)
Inventor
Nikolaus Dellantoni
Peter-Ernst Veith
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

Links

Classifications

    • HELECTRICITY
    • H01BASIC ELECTRIC ELEMENTS
    • H01QAERIALS
    • H01Q11/00Electrically-long aerials having dimensions more than twice the shortest operating wavelength and consisting of conductive active radiating elements
    • H01Q11/02Non-resonant aerials, e.g. travelling-wave aerial
    • H01Q11/08Helical aerials
    • HELECTRICITY
    • H01BASIC ELECTRIC ELEMENTS
    • H01QAERIALS
    • H01Q1/00Details of, or arrangements associated with, aerials
    • H01Q1/36Structural form of radiating elements, e.g. cone, spiral, umbrella; Particular materials used therewith
    • H01Q1/362Structural form of radiating elements, e.g. cone, spiral, umbrella; Particular materials used therewith for broadside radiating helical antennas
    • HELECTRICITY
    • H01BASIC ELECTRIC ELEMENTS
    • H01QAERIALS
    • H01Q5/00Arrangements for simultaneous operation of aerials on two or more different wavebands, e.g. dual-band or multi-band arrangements
    • H01Q5/30Arrangements for providing operation on different wavebands
    • H01Q5/378Combination of fed elements with parasitic elements
    • HELECTRICITY
    • H01BASIC ELECTRIC ELEMENTS
    • H01QAERIALS
    • H01Q5/00Arrangements for simultaneous operation of aerials on two or more different wavebands, e.g. dual-band or multi-band arrangements
    • H01Q5/50Feeding or matching arrangements for broad-band or multi-band operation

Abstract

The present invention relates to an antenna (1) for transmitting or receiving signals, comprising at least one first antenna element (2) for low frequencies and a second antenna element (3) for high frequencies. Both antennae are shaped like a spiral and are capacitively coupled to a high-frequency counter-weight (4). The antenna elements (2,3) are mounted in a parallel position. The inventive antenna (1) offers a large bandwidth, good 50 ohm adaptation of both antenna elements to the infeed point and good vertical electrical vector radiation characteristics. The invention (1) also enables highly compact dual band, trial band and multiband antennas for mobile, compact and stationary communication devices to be produced at minimum cost.

Description

description

Multiband antenna

The present invention relates to an antenna for transmitting and receiving signals are capacitively coupled with at least a first antenna element for lower frequencies and a second antenna element for higher frequencies, both of the antenna elements formed spirally and weight at a high frequency counter. Such antennas are suitable belt applications, for example as antennas of communication devices in dual and Mult.

Such prior art known antennas are shown for example schematically m Figs 11 and 15 °. In Figure 11, an antenna 13 is shown, wherein the antenna comprises a first antenna element 14 for lower frequencies and a second antenna element 15 for higher frequencies, the connected m series and are coupled to a radio-frequency-counterweight sixteenth The two series-connected antenna elements 14 and 15 are coupled via a common feed point 17 which is connected to a corresponding supply line 18 to the high-frequency counterweight sixteenth The high frequency counterweight consists UB SHORT- from a metal-coated dielectric. The antenna shown m Figure 11 is configured as a dual band antenna, since two antenna elements 14 and 15, namely a lower for a frequency, and the other are provided for a higher frequency. Is usually located, as shown m Figure 11, the antenna element 15 for higher frequencies near the high frequency counterweight 16 as the antenna element 14 for lower frequencies.

The disadvantage of m figure antenna 11 illustrated and known from the prior art is m a poor coupling of the antenna element 14 for lower frequencies in the high frequency counterweight 16. The reason is that the antenna element 14 for lower frequencies farther from the common feed point 17 is located, than the assistants ¬ nenelement 15 for higher frequencies. In the figures 12, 13 and 14, the return loss, the Fußimpedanz and the Standing wave ratio SWR of the antenna shown in Figure 11 with 13 serial antenna elements for the two frequency bands 880-900 MHz and 1.71 to 1.86 GHz are shown. Figure 12 shows the Rückflußdiagramm, 13, the FußImpedanz and Figure 14 shows the standing wave ratio SWR of the antenna shown in Figure 11. 13. As can be seen from the example shown in Figure 13 Fußimpedanzbild, the antenna 13 is a Fußimpedanz of about 100 ohms, so that poor coupling to the normally 50 ohms impedance of the feedline amount forming system is given. From Figure 14 it can be seen that the 3 dB bandwidth of the two antenna elements 14, 15 of the antenna 13 is less than the selected signal bandwidth fails, resulting in a slight Verstimmbarkeit the antenna 13 has capacitive influences to the surroundings, such as, for example, by the human body caused.

In Figure 15, another from the prior-art antenna 19 is shown having series-connected antenna elements. 20 and 21 In the embodiment shown in Figure 15 antenna 19 the two antenna elements 20, 21 are folded. As with the embodiment shown in Figure 11 antenna 13, the antenna element 21 is arranged for higher frequencies closer to the common feed 23 as the antenna element 20 for lower frequencies. Both the antenna elements 20, 21 of the antenna 19 are spirally formed and coupled to a radio-frequency-counterweight 22nd The common feed point '23 is connected to corresponding feed lines 24th

In the figures 16, 17 and 18, the return loss, the Fußimpedanz and the standing wave ratio SWR of the DAR provided in Figure 15 antenna 19 with folded serial antenna elements 20, 21 for the two frequency bands 880-960 MHz and 1.71 to 1 represented 88 GHz. It is nen to recognize that the antenna 19 has the same drawbacks as the antenna 13. The m FIG Fußimpedanz represented 17 amounts to about 100 ohms, so that there is a bad connection to the common impedance of the feed line system of approximately 50 ohms. The m FIG Standing wave ratio 18 shown SWR of the antenna 19 it can be seen that the antenna 19 has a 3dB Bandbreιte, which is less than the selected Sig- nalbandbreite, so that the antenna can easily be detuned by capacitive influences from the environment 19th As a result, results in a complicated and expensive construction of the Hochfrequenzte les of the respective communication device, m is the antenna used.

The object of the present invention is thus an arrival antenna for transmitting and receiving signals to provide the at least a first antenna element for lower frequencies and a second antenna element for higher frequencies, the better coupling to the respective feed line system and / or more Une pfmdlichkeit ensured overall genuber external capacitive influences.

This object is achieved by an antenna for transmitting and receiving signals according to claim 1, comprising at least a first antenna element for low frequencies, and a two-th antenna element for higher frequencies, both antenna elements are spiral-shaped and is coupled to a radiofrequency counterweight , characterized in that the antenna elements are connected in parallel.

The parallel connection of the two helical antenna elements according to the present invention allows better coupling or adaptation of the Fußimpedanz erfm- dungsgemaßen antenna to the respective feed line system. Further, the influence by external capacitive loads can be greatly reduced by the erfmdungsgemaße embodiment. The result is that communication devices, m which is installed the erfmdungsgemaße antenna, may be simpler and less expensive constructed. The erfmdungsgemaße antenna for applications in the dual-band and multi-ch suitable bandbere. a corresponding further antenna element is used notwen dig for each additional frequency range.

Advantageously, the antenna elements are capacitively coupled by coupling elements to the high-frequency counterweight. The antenna elements can be capacitively decoupled to ensure strommaßige decoupling of the two antenna elements on Emspeisepunkt. Advantageously catfish best hen the capacitive coupling elements from the high-frequency counterweight printed conductive surfaces. Here, the first antenna element having a first conductive surface may be composites, at which a Emspeisepunkt is and the st electrically conductively connected flat with a printed on an opposite side of the high frequency counterweight second conductor, wherein adjacent to the first conductor surface of the second conductor surface un opposite a Le ter third flat is printed with the second antenna element is connected.

The printed conductive surfaces thereby represent capacity, on the one hand guaranteed by the opposite configuration, a strahlungsmaßige decoupling of the two antenna element and allow the other hand, an electrical coupling of the low frequency antenna element to the high-frequency counterweight. In this way is made possible a wide-band 50 Ohm matching at Emspeisepunkt the antenna, which also m a higher 3 dB Bandbreιte affects both m and all frequency ranges. The 3dB Bandbreιte the ER fmdungsgemäßen antenna lies about 30-50% higher than the signal bandwidth benotigte respectively, whereby the antenna is much less sensitive to external capacitive influences. Furthermore, it is advantageous if the antenna elements are decoupled radiation. Can, if the antenna elements comprise spirals, these spirals have different directions of rotation for this purpose.

In the following, the antenna will be explained in accordance with the present invention with reference to a preferred exemplary embodiment with reference to the attached drawings, in which

Figure 1 is a front view of a erf dungsgemaßen antenna,

Figure 2 is a back view of the antenna shown m FIG erfm- dungsgemaßen 1,

Figure 3 em electrical equivalent circuit diagram of the antenna m erf dungsgemaßen Figures 1 and 2 shown,

Figure 4 em Ruckflußdiagramm the inventive shaped antenna m to Figures 1 and 2 shown,

Figure 5 em Fußimpedanzdiagramm the inventive shaped antenna m to Figures 1 and 2 shown,

Figure 6 e Standing wave ratio diagram of the inventive antenna to Figures 1 and 2 shown,

Figures 7-10 measurement results of the antenna directivity of an inventive shaped antenna at different frequencies,

Figure 11 is a schematic representation of a prior art antenna, figure 12 em Ruckflußdiagramm the known antenna shown m figure 11,

Figure 13 em FußImpedanzdlagramm the m th Figure 11 gezeig- known antenna,

Figure 14 em factor standing wave-pattern of the known antenna shown in figure 11,

Figure 15 is a schematic representation of a further prior art antenna,

Figure 16 em Ruckflußdiagramm m of FIG known antenna 15 shown,

Figure 17 em Fußimpedanzdiagramm m of FIG known antenna 15 shown, and

Figure 18 em Standing wave ratio diagram of FIG known m antenna 15 shown.

Figure 1 shows the front view of an inventive shaped antenna 1. The antenna 1 comprises em first antenna element 2 for lower frequencies and e second antenna element 3 for higher frequencies. Both antenna elements 2 and 3 are spiral-shaped and consist for example of metal. The two antenna elements 2 and 3 are coupled in parallel to em radiofrequency counterweight. 4 The high frequency counterweight 4 consists for example of a DIE lektrikum and has the shape of a flat rectangle with a length Li of about λ / 4 and a width b L of about λ / 8th λ is the wavelength of the center frequency of the frequency band, the second antenna element 3, for higher frequencies radiates or receives signals.

The two antenna elements 2 and 3 are coupled to the high-frequency counterweight 4 by means of printed conductor surfaces 5, 6,. 7 The circuit areas 5, 6, 7 are thin layers of metal which are printed on the side faces of a corner of the high-frequency counterweight. 4 The first antenna element 2 for lower frequencies is connected to a first conductor element 5, also the Emspeisepunkt is at the s ch 8 for the feed line 9 for feeding or forwarding of signals. The first antenna element 2 extends m the plane of the radiofrequency counterweight 4 away from the central axis of its spiral.

In addition to the first circuit face 5 a third conductor surface 6 is printed on the same side of the high-frequency counterweight. 4 The first circuit face 5 and the third conductor surface 6 are such arranged that they are electrically insulated. The second antenna element 3, for higher frequencies is connected to the third conductive surface. 6 The central axis of the helix of the second antenna element 3 extends parallel to the central axis of the helix of the first antenna element. 2

In Figure 2, the back of the antenna 1 shown m figure 1 is shown. It can be seen that, compared with the first circuit face 5 and the third conductor surface 6 e ne second conductor surface is printed on the opposite side of the high- frequency counterweight 4 7 whose surface about the added surfaces of the first and the third conductor surface 5 and 6 corresponds. The second conductor surface 7 is electrically connected by a passing through the high-frequency counterweight 4 via hole 10 with the first conductor surface. 5

In Figure 3 em electrical equivalent circuit diagram of the m is the Figures 1 and 2 inventive shaped antenna 1 shown. The connected to the first and the second circuit face 5 and 7, first antenna element 2 for lower frequencies is connected to the common Emspeisepunkt 8 with the feed line. 9 The first and second conductor flat 5 and 7 are coupled via capacitive coupling elements 12 to the high-frequency counterweight. The second antenna element 3, for higher frequencies is connected to the third conductor surface. 6 The third conductor surface 6 is likewise coupled via em capacitive coupling element 12 with the high-frequency counterweight. 4 The first and second circuit face 5 and 7 are decoupled via em capacitive element 11 from the third conductor surface 6 so that the currents of the antenna element 3 are decoupled for higher frequencies of the currents of the antenna element 2 for lower frequencies.

The capacitive coupling elements 12 are realized by the information printed on the high-frequency counterweight conductor surfaces 5, 6 and 7, which drove through an electrical coupling of the two antenna elements 2 and 3 to the high-frequency counterweight 4 and respectively thus a broader band 50 ohm matching at Emspeisepunkt 8 afford. base of the antenna 1 to the amount typically 50 ohms impedance end of the feed line 9 gewahr-. By the thus printed on the high-frequency counterweight 4 conductor surfaces 5, 6 and 7 and the corresponding associated antenna elements 2 and 3, a capacitive decoupling of the currents of the antenna element 3 is implemented by the currents of the antenna element. 2 The arrangement of the first printed circuit board 5 and the third conductor surface 6 on the one hand and the second conductor surface 7 on the other side of the high-frequency counterweight 4 illustrates em capacitive Hochpaßfllter for strommaßige decoupling of the two antenna elements 2 and 3. FIG. A radiation decoupling of the two antenna elements 2 and 3 can be achieved by a different direction of rotation of the respective spirals.

In Figures 4, 5 and 6, the Ruckflußdampfung that Fußimpedanz and the Standing wave ratio SWR of the antenna 1 Figures 1 and 2 shown for the two frequency bands 880-960 MHz and 1.71 GHz and 1.88 are shown. In the figure m Ruckflußdiagramm shown in Figure 4 thereby also the Hochpaßkurve the adjustment of the antenna element 3 is shown for higher frequencies. The attenuation of the 880 MHz band amounts to about 6 dB, which permits closer spacing of the two antenna elements 2 and 3 on Emspeisepunkt 8, so that the benotigte for the antenna 1 volume is reduced and corresponds approximately to a Emband rod antenna.

The figure shown FußImpedanzdiagramm 5 shows an approximately equivalent adjustment of the two antenna elements 2 and 3 to 50 ohms, so that a very good fit to the usually about 50 ohms amount impedance end of the feed line is ensured. 9 The resulting 3 dB Bandbreιte for both frequency ranges is approximately 30-50% greater than the respective benotigte signal bandwidth, which showed overall from 6 Standing wave ratio diagram can be seen.

Thus, the erfmdungsgemaße antenna 1 is much less sensitive to external capacitive influences than the prior art antennas, such as are, for example, m shown in FIGS 11 and 15 °.

Further, the erfmdungsgemaße antenna 1 with parallel-connected spiral-shaped antenna elements 2 and 3 excellent radiation properties, such as NEN-directional characteristics of the figures refer 7-10 from the measured antennas. The m the figures illustrated antenna directivity patterns 7-10 were measured with an inventive shaped antenna was installed m a base plate with the minimum dimensions of a mobile phone. Figure 7 shows the antenna directivity characteristic for a frequency of 882 MHz, 8, the antenna directivity characteristic for a frequency of 960 MHz, Figure 9, the antenna directivity characteristic for a frequency of 1710 MHz and 10, the antenna directivity characteristic for a frequency of 1880 MHz. thus the Figures 7 and 8 represent the antenna directivity characteristics of the two boundary frequencies of the lower frequency range, while Figures 9 and 10 show the two antenna directivity characteristics of the two boundary frequencies of the higher frequency range. As can be seen from the graphs, the gain of the antenna 1 according to the invention for vertical polarization of the electric vector in the main lobe is 3-4 dBi in the two frequency bands.

Thus, the antenna according to the invention enables the production of dual, trial and multi-band antennas for mobile, compact and stationary communications devices at minimal cost and with a very small footprint. The construction of the antenna 1 according to the invention ensures optimal electrical characteristics for each frequency range such. B. a large frequency bandwidth, a good 50 ohm matching at the feed point and an omni-directional radiation pattern of the toroidal vertical electric vector.

Claims

Patentanspr├╝che
1. Antenna (1) for transmitting and receiving signals, having at least a first antenna element (2) für lower frequencies and a second antenna element (3) fürhöhere frequencies, both of the antenna elements (2, formed 3) spiralförmig and (em in high frequency counterweight 4) are capacitively coupled, characterized in that the antenna elements daß (2, 3) are connected in parallel.
2. Antenna gemäß claim 1, characterized in that the antenna elements daß (2, 3) by capacitive elements Koppelele- to the high frequency counterweight (4) are coupled.
3. Antenna gemäß claim 2, characterized in that the antenna elements daß (2, 3) are capacitively decoupled.
4. antenna gemäß claim 2 or 3 characterized in that the capacitive coupling elements daß from the high-frequency counterweight (4) printed conductor surfaces (5, 6, 7) consist hen.
5. antenna gemäß claim 4, characterized in, the first antenna element (2) daß with a first conductor surface (5), at which em Emspeisepunkt (8) and de electrically conductively connected to a on , a gegenüberliegenden side of the high-frequency counterweight (4) printed second conductor surface (7) is connected being next to the first conductor surface (5) and the second conductor surface (7) printed gegenüberliegend a third conductor surface (6) , with the verbun the second antenna member (3)
6. Antenna gemäß one of the preceding Ansprüche, characterized in daß the antenna elements (2, 3) are decoupled radiation.
7. Antenna gemäß one of the preceding Ansprüche, characterized in that the antenna elements daß (2, 3) comprise spirals.
8. Antenna gemäß claim 7, characterized in that the spirals daß for radiation decoupling different
have directions of rotation.
is 9. Antenna gemäß one of the preceding Ansprüche, characterized in daß it as a multi-band antenna with multiple antenna elements formed.
PCT/DE1999/002404 1998-08-07 1999-08-02 Multiband antenna WO2000008712A1 (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
DE19835879.2 1998-08-07
DE19835879 1998-08-07

Publications (1)

Publication Number Publication Date
WO2000008712A1 true true WO2000008712A1 (en) 2000-02-17

Family

ID=7876871

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/DE1999/002404 WO2000008712A1 (en) 1998-08-07 1999-08-02 Multiband antenna

Country Status (1)

Country Link
WO (1) WO2000008712A1 (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2009132091A3 (en) * 2008-04-23 2010-07-22 Enteromedics, Inc. Antenna arrangements for implantable therapy device
US8738103B2 (en) 2006-07-18 2014-05-27 Fractus, S.A. Multiple-body-configuration multimedia and smartphone multifunction wireless devices
US8941541B2 (en) 1999-09-20 2015-01-27 Fractus, S.A. Multilevel antennae

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4205084A1 (en) * 1992-02-17 1993-09-02 Karl Harms Handels Gmbh & Co K Electromagnetic radiation receiver e.g. for antitheft security systems - consists of adjacent pairs of conductors in common planes, each pair wound into octagonal coils with equal numbers of turns and density

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4205084A1 (en) * 1992-02-17 1993-09-02 Karl Harms Handels Gmbh & Co K Electromagnetic radiation receiver e.g. for antitheft security systems - consists of adjacent pairs of conductors in common planes, each pair wound into octagonal coils with equal numbers of turns and density

Non-Patent Citations (3)

* Cited by examiner, † Cited by third party
Title
ERAETUULI P ET AL: "DUAL FREQUENCY WIRE ANTENNAS", ELECTRONICS LETTERS,GB,IEE STEVENAGE, vol. 32, no. 12, pages 1051-1052, XP000620670, ISSN: 0013-5194 *
HAAPALA P ET AL: "DUAL FREQUENCY HELICAL ANTENNAS FOR HANDSETS", IEEE VEHICULAR TECHNOLOGY CONFERENCE,US,NEW YORK, IEEE, vol. CONF. 46, pages 336-338, XP000594306, ISBN: 0-7803-3158-3 *
NAKANO H ET AL: "REALIZATION OF DUAL-FREQUENCY AND WIDE-BAND VSWR PERFORMANCES USINGNORMAL-MODE HELICAL AND INVERTED-F ANTENNAS", IEEE TRANSACTIONS ON ANTENNAS AND PROPAGATION,US,IEEE INC. NEW YORK, vol. 46, no. 6, pages 788-793, XP000766088, ISSN: 0018-926X *

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US9240632B2 (en) 1999-09-20 2016-01-19 Fractus, S.A. Multilevel antennae
US8941541B2 (en) 1999-09-20 2015-01-27 Fractus, S.A. Multilevel antennae
US8976069B2 (en) 1999-09-20 2015-03-10 Fractus, S.A. Multilevel antennae
US9000985B2 (en) 1999-09-20 2015-04-07 Fractus, S.A. Multilevel antennae
US9054421B2 (en) 1999-09-20 2015-06-09 Fractus, S.A. Multilevel antennae
US9362617B2 (en) 1999-09-20 2016-06-07 Fractus, S.A. Multilevel antennae
US9761934B2 (en) 1999-09-20 2017-09-12 Fractus, S.A. Multilevel antennae
US9099773B2 (en) 2006-07-18 2015-08-04 Fractus, S.A. Multiple-body-configuration multimedia and smartphone multifunction wireless devices
US8738103B2 (en) 2006-07-18 2014-05-27 Fractus, S.A. Multiple-body-configuration multimedia and smartphone multifunction wireless devices
US9899727B2 (en) 2006-07-18 2018-02-20 Fractus, S.A. Multiple-body-configuration multimedia and smartphone multifunction wireless devices
WO2009132091A3 (en) * 2008-04-23 2010-07-22 Enteromedics, Inc. Antenna arrangements for implantable therapy device

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