EP0929913B1 - Antenne für mehrere bänder - Google Patents

Antenne für mehrere bänder Download PDF

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Publication number
EP0929913B1
EP0929913B1 EP97943967A EP97943967A EP0929913B1 EP 0929913 B1 EP0929913 B1 EP 0929913B1 EP 97943967 A EP97943967 A EP 97943967A EP 97943967 A EP97943967 A EP 97943967A EP 0929913 B1 EP0929913 B1 EP 0929913B1
Authority
EP
European Patent Office
Prior art keywords
feed
feedline
antenna
radio
tubular element
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
EP97943967A
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English (en)
French (fr)
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EP0929913A1 (de
Inventor
Dean Kitchener
Julius George Robson
Ronald Harvey Johnston
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.)
Nortel Networks Ltd
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Nortel Networks Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority claimed from GBGB9620646.1A external-priority patent/GB9620646D0/en
Priority claimed from GB9715835A external-priority patent/GB2317994B/en
Priority claimed from GB9716138A external-priority patent/GB2327813A/en
Application filed by Nortel Networks Ltd filed Critical Nortel Networks Ltd
Publication of EP0929913A1 publication Critical patent/EP0929913A1/de
Application granted granted Critical
Publication of EP0929913B1 publication Critical patent/EP0929913B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q21/00—Antenna arrays or systems
    • H01Q21/30—Combinations of separate antenna units operating in different wavebands and connected to a common feeder system
    • 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
    • H01Q5/00—Arrangements for simultaneous operation of antennas on two or more different wavebands, e.g. dual-band or multi-band arrangements
    • H01Q5/30—Arrangements for providing operation on different wavebands
    • H01Q5/307—Individual or coupled radiating elements, each element being fed in an unspecified way
    • H01Q5/314—Individual or coupled radiating elements, each element being fed in an unspecified way using frequency dependent circuits or components, e.g. trap circuits or capacitors
    • H01Q5/321—Individual or coupled radiating elements, each element being fed in an unspecified way using frequency dependent circuits or components, e.g. trap circuits or capacitors within a radiating element or between connected radiating elements
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q5/00—Arrangements for simultaneous operation of antennas on two or more different wavebands, e.g. dual-band or multi-band arrangements
    • H01Q5/40—Imbricated or interleaved structures; Combined or electromagnetically coupled arrangements, e.g. comprising two or more non-connected fed radiating elements
    • H01Q5/48—Combinations of two or more dipole type 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
    • H01Q9/30—Resonant antennas with feed to end of elongated active element, e.g. unipole
    • H01Q9/32—Vertical arrangement of 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
    • H01Q9/40—Element having extended radiating surface
    • 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
    • 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
    • H01Q9/44—Resonant antennas with a plurality of divergent straight elements, e.g. V-dipole, X-antenna; with a plurality of elements having mutually inclined substantially straight portions

Definitions

  • the present invention relates to a multi mode radio antenna and, in particular, relates to the same for use in a multi-mode mobile radio handset.
  • each individual personal communications system user will need a dual network service for complete coverage. Consequently the user requires a handset that will not only function throughout the coverage area of the specific subscribed-to digital network, but also have a switched alternative mode to operate on the universal analogue network.
  • the antenna For a dual mode terminal perhaps the simplest option for the antenna is to use a separate element for each of the desired bands. This could be in form of one external and one internal antenna, or two internal antennas. Two external antennas would be cumbersome, and unsightly. Such use of two antennas which have separate resonant frequencies of operation is accordingly complicated and unwieldy.
  • antenna One type of antenna is the monopole antenna which has a length corresponding to a quarter wavelength of its design frequency. This design is efficient, robust, provides a good bandwidth and, typically, can be a good match to a 50 ⁇ input impedance.
  • Figure 1 shows an example of such an antenna.
  • the quarter wavelength monopole is relatively long and is limited to multiple frequency usage at the third and fifth harmonic frequencies. Whilst it may be possible to operate the antenna in two frequency bands associated with different radio systems, where the operating frequency of one band is a harmonic of the other operating frequency band, such an overlap would not be tenable because of the inevitable interference effects. Further, radio frequency spectrum allocation is not, typically, based upon the harmonics of a primary band.
  • Results for structure (b) state that it was tuned to the frequencies 1750 MHz and 894 MHz, and that 10 dB return loss bandwidths were obtained of 12% and 4.5% respectively.
  • Structure (c) is simply a more compact version of (b), and not surprisingly has a narrower bandwidth. For the upper and lower bands, measured bandwidths of 11% and 2.9% were obtained where the overall structure height was 34 mm. Thus, in summary these antennas provide a bandwidth which is not sufficient for many radio applications, and also does not leave any margin for manufacturing tolerances.
  • a dual band external antenna is described by Ali et al in 'A wide band dual meander sleeve antenna', IEEE Antennas and Propagation Society International Symposium, 1995, vol.2 p.1124-7, 18-23 June 1995, Newport Beach, CA, USA, and this is called the wide band dual meander sleeve antenna.
  • This antenna is described as potentially useful as a low profile antenna for a dual mode handset.
  • the results presented in the paper are for the case where the experimental antenna is mounted on a large ground plane (90 cm 2 ) and as such would not be suitable for applications such as mobile telecommunications handsets.
  • the present invention seeks to provide a multi-mode antenna which has a number of resonance bands and overcomes the aforementioned problems.
  • the present invention also seeks to provide an antenna arrangement for a multi-mode radio communications handset.
  • the present invention further seeks to provide an antenna for a cellular radio transceiver which is aesthetically pleasing, low cost, of high strength and electrically efficient.
  • a multi resonant radio antenna operable to receive and transmit radio signals in different frequency bands, the antenna comprising a conductive feed element and a tubular element which extend relative to a ground plane; wherein the feed element has a feedpoint at a proximal end and the tubular element is electrically connected to the feed element at a distal end of the feed element, the tubular element extending around the feed element and terminating in a rim; wherein the electrical length along the feed element from the feed point to the rim of the tubular element corresponds to a quarter of a wavelength ⁇ 1 /4 of a radio signal in a first frequency band; and wherein the electrical length from the feed point to the distal end of the feedline corresponds to a quarter of the wavelength ⁇ 2 /4 of a radio signal in a second lower frequency.
  • the feed element is preferably coaxial with the tubular element.
  • the region on the inside of the tubular element can be filled or partially filled with a dielectric material. This can improve the robustness of the design.
  • the tubular element can be encased within a dielectric material.
  • the distal portion of the central element can be retractable within a telescopic proximal portion of the feedline. This makes the unit more compact or more easily stored.
  • the longer wavelength section may not be employed if communication takes place at the higher frequency.
  • the tubular element can comprise a conductive braid and/or can be cylindrical. By increasing the diameter of the coaxial section, the bandwidth at the higher frequencies could be increased, but this would reduce the efficiency at the lower frequencies of operation.
  • a method of operating a multi resonant radio antenna operable to receive and transmit radio signals in different frequency bands comprising a conductive feed element and a tubular element which extend relative to a ground plane; wherein the feed element has a feedpoint at a proximal end and the tubular element is electrically connected to the feed element at a distal end of the feed element, the tubular element extending from said distal end around the feed element and terminating in a rim wherein the electrical length along the feed element from the feed point to the rim of the tubular element corresponds to a quarter of a wavelength ⁇ 1 of a radio signal in a first frequency band; and wherein the electrical length from the feed point to the distal end of the feedline corresponds to a quarter of the wavelength ⁇ 2 of a radio signal in a second lower frequency wherein, in a transmit mode at the first frequency, the method comprises the steps of providing radio signals, via the feed, to the feedline, wherein
  • a method of operating a multi resonant radio antenna operable to receive and transmit radio signals in different frequency bands comprising a conductive feed element and a tubular element which extend relative to a ground plane; wherein the feed element has a feedpoint at a proximal end and the tubular element is electrically connected to the feed element at a distal end of the feed element, the tubular element extending from said distal end around the feed element and terminating in a rim wherein the electrical length along the feed element from the feed point to the rim of the tubular element corresponds to a quarter of a wavelength ⁇ 1 of a radio signal in a first frequency band; and wherein the electrical length from the feed point to the distal end of the feedline corresponds to a quarter of the wavelength ⁇ 2 of a radio signal in a second lower frequency wherein, in a receive mode at the first frequency, the method comprises the steps of coupling radio signals, via the feed, from the feedline re
  • a multi mode radio handset incorporating a multi resonant antenna operable to receive and transmit radio signals in different frequency bands, the antenna comprising a conductive feed element and a tubular element which extend relative to a ground; wherein the feed element has a feedpoint at a proximal end and the tubular element is electrically connected to the feed element at a distal end of the feed element, the tubular element extending around the feed element and terminating in a rim; wherein the electrical length along the feed element from the feed point to the rim of the tubular element corresponds to a quarter of a wavelength ⁇ 1 of a radio signal in a first frequency band; and wherein the electrical length from the feedpoint to the distal end of the feedline corresponds to a quarter of the wavelength ⁇ 2 of a radio signal in a second lower frequency band.
  • the quarter wavelength monopole antenna which will radiate with respect to a ground plane.
  • the ground plane is provided by the casing associated with the handset electronics enclosure.
  • the quarter wavelength monopole such as is depicted in Figure 1d may be viewed as possessing a quarter wavelength image and it forms the half wavelength equivalent, as shown in Figure 1e.
  • Figure 1f shows the resulting current distribution pattern along the length of a linear monopole antenna, for several wavelengths corresponding to ⁇ /4 and 3 ⁇ /4, where ⁇ is the free space wavelength.
  • FIG. 2 shows a block diagram of a typical cellular radio handset.
  • Radio frequency signals are received and transmitted by the antenna 2 which is connected to a radio front end 4.
  • transmit and receive signals are converted between radio frequency and base band, whereby digital signal processing means 6 encode the transmit and decode the receive signals and from these can determine the audio signals which are communicated to and from the handset user by loudspeaker 7 and microphone 8.
  • the front end will typically contain transmit and receive paths which are mixed to an intermediate frequency with a local oscillator. These intermediate frequency signals will be further processed and mixed so that the input and output signals to and from the front end are at baseband and suitable for digital to analogue or analogue to digital conversion, as appropriate, prior to digital signal processing.
  • a handset architecture comprising a dual mode radio front end for the reception of both digital PCS 1900 signals and analogue AMPS signals.
  • PCS 1900 operates in the frequency band 1930 to 1990 MHz on the receive downlink to the handset and in the 1850 to 1910 MHz band on the transmit uplink from the handset.
  • AMPS operates in the frequency band 824 to 849 on the transmit uplink from the handset and in the 869 to 894 MHz band on the receive downlink to the handset.
  • PCS 1900 operates either in an uplink mode or in a downlink mode; AMPS can operate in both modes simultaneously. For this reason the switch 14 from the antenna 12 has three positions. Details of the antenna are not shown in this figure for simplicity.
  • the switch 14 directs incoming digital PCS 1900 signals to the PCS 1900 receive path
  • the signals from the band select filter 22 are passed to a mixer 30 which mixes the received signal with a signal from a synthesised local oscillator 34 to produce an intermediate frequency (IF) signal at 225 MHz which is subsequently amplified by further amplifying means 36.
  • the PCS 1900 signals are passed through a second switching circuit 44 which operates simultaneously with the first switch 14 by mode control means (not shown).
  • the mode control means identifies whether the signals are digital or analogue modulation and determines in which mode the transceiver is operating.
  • the PCS 1900 and AMPS baseband signals are raised to 150 MHz and 225 MHz intermediate frequencies (IFs) respectively.
  • the upconverted IF containing either the PCS 1900 signal at 150 MHz or the AMPS signal at 225 MHz is applied respectively to the PCS 1900 transmit band at 1850 to 1910 MHz and the AMPS transmit band at 824 to 849 MHz.
  • the respective signals are RF band filtered by 26 and 28 prior to power amplification and then fed to the antenna via separate filters and switch 14.
  • the main factors that should be taken into account in the design of an antenna are electrical performance, volume required (internally), cost, and manufacturability.
  • the main performance parameters are:- radiation efficiency; isolation (where two elements are used); typically the return loss should be >10 dB across the operating band.
  • the PCS antenna requires a 7.3% 10 dB return loss bandwidth
  • the AMPS antenna requires a 8.1% bandwidth.
  • Mean effective gain is a measure of the handset antenna radiation pattern, and involves the multi-path angular density function. SAR is fixed by regulatory limits. Radiation efficiency, this should be greater than -2 dB for the handset in isolation (ideally >-1 dB for external antennas). With the handset in the presence of the head and hand the efficiency should be >-3 dB.
  • the isolation required between two antenna elements ought to be >10 dB, since if the coupling is too high this can result in a significant reduction in efficiency.
  • FIG. 4 a schematic diagram of a dual band monopole antenna structure made in accordance with the invention is shown, a multi resonant radio antenna operable to receive and transmit radio signals in different frequency bands, the antenna comprising a conductive feed element and a tubular element which extend relative to a ground plane; wherein the feed element has a feedpoint at a proximal end and the tubular element is electrically connected to the feed element at a distal end 134 of the feed element, the tubular element extending around the feed element and terminating in a rim wherein the electrical length along the feed element from the feed point to the rim of the tubular element corresponds to a quarter of a wavelength ⁇ 1 of a radio signal in a first frequency band; and wherein the electrical length from the feed point to the distal end of the feedline corresponds to a quarter of the wavelength ⁇ 2 of a radio signal in a second lower frequency.
  • the wavelengths for the two resonances are given by ⁇ 1 and ⁇ 2 , where ⁇ 1 corresponds to the higher frequency.
  • the antenna simply looks like a quarter wave monopole. This is because there is a ⁇ 1 /4 coaxial stub at the top of the initial ⁇ 1 /4 'monopole'. The stub is short-circuited at one end, presenting an open circuit at the top of the monopole.
  • current is induced on the outer surface of the coaxial stub which is in phase with the lower ⁇ 1 /4 section.
  • the overall height is ⁇ 2 /4 and so a second resonance is generated.
  • the dimensions of one antenna are shown in figure 5.
  • the antenna was mounted on a rectangular PCB with dimensions comparable to a standard handset.
  • the measured return loss is shown in figure 6.
  • the 10 dB return loss bandwidth is 800 - 930 MHz.
  • the centre of this band is 865 MHz, and using this centre frequency the percentage bandwidth is 15%.
  • the AMPS band (824 - 894 MHz) is accommodated within this bandwidth.
  • the 10 dB return loss bandwidth is 1870 - 2050 MHz.
  • the centre of this band is 1960 MHz, and using this centre frequency the percentage bandwidth is 9.2%. While this bandwidth is adequate for the PCS 1900 band (1850 - 1990 MHz), some slight retuning is required, which would involve a small lengthening of the 33 mm monopole section shown in figure 5.
  • the measured azimuth radiation patterns at 900 MHz and 1900 MHz are shown in figures 7 and 8.
  • the measured azimuth gain is quite low at 900 MHz, and further measurements are required to determine the antenna efficiency, and elevation patterns in the two bands.
  • the elevation pattern for 900 MHz may well be down tilted.
  • the overall structural length is designed to be nominally equivalent to a quarter of a wavelength long. This is where the reason for the choice of the frequency ratio of two becomes apparent: it is a quarter of the wavelength at the higher frequency.
  • the stub cannot be ignored. This is now an eighth of a wavelength long short circuited stub which results in an inductive reactance at the open end. Consequently, the structure looks like a quarter wavelength monopole with an inductive reactance at its centre. This affects the input impedance such that some matching is required.
  • Figure 9 shows a second embodiment 90 with a 1 mm thick tube 92, closed at a distal end and having a PTFE plug 94 inserted at the open end, a copper tube 96 extending from a sma connector 98 mounted on a ground portion, such as a mobile phone case, 100. There is no d.c. connection between the tube 96 and the case 100.
  • the tube could be replaced with a solid element: alternatively the antenna structure could be made flexible.
  • Figure 10 shows the physical dimensions of an embodiment.
  • the flange of the dielectric protrudes by 2 mm in the example shown. This enables the structure to be self-locating since it ensures that the dielectric extends to a particular depth inside the structure. Nevertheless, it could be flush.
  • the coaxial region can also be fully dielectrically loaded but the electrical length would be changed, which would require a shortening of the coaxial region, but it shortens the whole structure. It does nothing to change the length of the intermediate portion operable at the highest frequency because the open circuit still exists. By increasing the lowest frequency some control over the frequency ratio can be obtained. This allows a consequential flexibility in frequency ranges so that frequency combinations such as GSM and DECT, AMPS and PCS 1900, can be covered.
  • inventions of the present invention thus provide an antenna design which has good bandwidth for several frequency bands; the antenna can be manufactured such that the overall dimensions can be reduced; the antenna can be provided with a dielectric surround whereby the antenna can be made sufficiently rugged whereby it is not susceptible to damage in normal use, the dielectric surround and the conductive elements preferably being suitably elastic and flexible.

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Details Of Aerials (AREA)
  • Variable-Direction Aerials And Aerial Arrays (AREA)
  • Waveguide Aerials (AREA)
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Claims (9)

  1. Mehrfach resonante Funkantenne (116), die zum Empfang und zum Senden von Funksignalen in unterschiedlichen Frequenzbändem betreibbar ist,
    wobei die Antenne ein leitendes Speiseelement (122) und ein rohrföhrmiges Element (118) umfasst, die sich gegenüber einer Masse (128) erstrecken;
    wobei das Speiseelement einen Speisepunkt (132) an einem nahegelegenen Ende aufweist und das rohrföhrmige Element elektrisch mit dem Speiseelement an einem femliegenden Ende (134) des Speiseelementes verbunden ist, wobei sich das rohrförmige Element um das Speiseelement herum erstreckt und in einem Kranz (120) endet;
    wobei die elektrische Länge entlang des Speiseelementes von dem Speisepunkt zu dem Kranz des rohrföhrmigen Elementes einem Viertel einer Wellenlänge (λ1/4) eines Funksignales in einem ersten Frequenzband entspricht. wobei die elektrische Länge von dem Speisepunkt zu dem femliegenden Ende der Speiseleitung einem Viertel der Wellenlänge (λ2/4) eines Funksignales in einem zweiten niedrigerem Frequenzband entspricht.
  2. Mehrfach resonante Funkantenne nach Anspruch 1, bei der das rohrföhrmige Element ein zylindrisches Element ist.
  3. Mehrfach resonante Funkantenne nach Anspruch 1, bei der der femliegende Abschnitt des mittleren Elementes in einen nahegelegen Abschnitt des leitendenden Speiseelementes einziehbar ist.
  4. Mehrfach resonante Funkantenne nach einem der Ansprüche 1 - 3, bei der das leitende Speiseelement koaxial zu dem rohrföhrmigen Element ist.
  5. Mehrfach resonante Funkantenne nach einem der Ansprüche 1 - 4, bei der der Bereich im Inneren des rohrföhrmigen Elementes vollständig oder teilweise mit einem dielektrischem Material (94) gefüllt sein kann.
  6. Mehrfach resonante Funkantenne nach einem der Ansprüche 1 - 5, bei der das rohrföhrmige Element in einem dielektrischem Material eingeschlossen ist.
  7. Verfahren zum Betrieb einer mehrfach resonanten Funkantenne, die zum Empfang und zum Senden von Funksignalen in unterschiedlichen Frequenzbändem betreibbar ist,
       wobei die Antenne ein leitendes Speiseelement und rohrföhrmiges Element umfasst, die sich gegenüber einer Masseebene erstrecken;
       wobei das Speiseelement einen Speisepunkt an einem nahegelegenen Ende aufweist und das rohrföhrmige Element elektrisch mit dem Speiseelement an einem femliegenden Ende des Speiseelementes verbunden ist, wobei sich das rohrföhrmigeElement um das Speiseelement herum erstreckt und in einem Kranz endet,
       wobei die elektrische Länge entlang des Speiseelementes von dem Speisepunkt zum Kranz des rohrföhrmigen Elementes einem Viertel einer Wellenlänge (λ1/4) eines Funksignales in einem ersten Frequenzband entspricht; und
       wobei die elektrische Länge vom Speisepunkt zu dem femliegende Ende der Speiseleitung einem Viertel der Wellenlänge (λ2/4) eines Funksignales in einer zweiten niedrigeren Frequenz entspricht.
       wobei in einer Sendebetriebsart bei der ersten Frequenz das Verfahren die Schritte der Zuführung von Funksignalen über die Speisung an die Speiseleitung umfasst,
    wobei die Speiseleitung entlang der Länge der Speiseleitung bis zu dem Kranz des rohrföhrmigen Elementes abstrahlt, und
       wobei in einer Sendebetriebsart bei der zweiten Frequenz das Verfahren die Schritte der Zuführung von Funksignalen über die Speisung an die Speiseleitung umfasst, wobei die Speiseleitung entlang der Länge der Speiseleitung und des rohrföhrmigen Abschnittes bis zum femliegenden Ende des Speiseelementes abstrahlt.
  8. Verfahren zum Betrieb einer mehrfach resonanten Funkantenne, die zum Empfang und zum Aussenden von Funksignalen in unterschiedlichen Frequenzbändern betreibbar ist,
       wobei die Antenne ein leitendes Speiseelement und ein rohrföhrmiges Element umfasst, die sich gegenüber einer Masseebene erstrecken;
       wobei das Speiseelement einen Speisepunkt an einem nahegelegen Ende aufweist und das rohrföhrmige Element elektrisch mit dem Speiseelement an einem femliegenden Ende des Speiseelementes verbunden ist, wobei sich das rohrföhrmige Element um das Speiseelement herum erstreckt und in einem Kranz endet, wobei die elektrische Länge entlang des Speiseelementes von dem Speisepunkt zum Kranz des rohrföhrmigen Elementes einem Viertel einer Wellenlänge (λ1/4) eines Funksignales in einem ersten Frequenzband entspricht; und
       wobei die elektrische Länge von dem Speisepunkt zum fernliegenden Ende der Speiseleitung einem Viertel der Wellenlänge (λ2/4) eines Funksignales in einem zweiten niedrigerem Frequenzband entspricht,
       wobei in einer Empfangsbetriebsart bei der ersten Frequenz das Verfahren die Schritte des Ankoppelns von Funksignalen über die Speisung von der Speiseleitung umfasst, die entlang der Länge der Speiseleitung bis zum Kranz des rohrföhrmigen Elementes in Resonanz ist,
       wobei in einer Empfangsbetriebsart bei der zweiten Frequenz das Verfahren die Schritte des Ankoppelns von Funksignalen über die Speisung von der Speiseleitung umfasst, die entlang der Speiseleitung und des rohrföhrmigen Abschnittes bis zum femliegenden Ende des Speiseelementes in Resonanz ist.
  9. Mehrfach-Moden-Funk-Handapparat, der eine Antenne nach einem der Ansprüche 1-6 beinhaltet.
EP97943967A 1996-10-02 1997-10-02 Antenne für mehrere bänder Expired - Lifetime EP0929913B1 (de)

Applications Claiming Priority (7)

Application Number Priority Date Filing Date Title
GBGB9620646.1A GB9620646D0 (en) 1996-10-02 1996-10-02 A duel mode radio antenna
GB9620646 1996-10-02
GB9715835A GB2317994B (en) 1996-10-02 1997-07-28 A multiresonant antenna
GB9716138 1997-07-31
GB9716138A GB2327813A (en) 1997-07-31 1997-07-31 A dual resonant antenna
GB9715835 1997-08-28
PCT/GB1997/002670 WO1998015031A1 (en) 1996-10-02 1997-10-02 A multi resonant radio antenna

Publications (2)

Publication Number Publication Date
EP0929913A1 EP0929913A1 (de) 1999-07-21
EP0929913B1 true EP0929913B1 (de) 2002-07-31

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EP97943967A Expired - Lifetime EP0929913B1 (de) 1996-10-02 1997-10-02 Antenne für mehrere bänder

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EP (1) EP0929913B1 (de)
DE (1) DE69714454T2 (de)
WO (1) WO1998015031A1 (de)

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FR2816114B1 (fr) * 2000-10-31 2003-01-24 Schlumberger Systems & Service Antenne multibande
WO2002043185A1 (de) * 2000-11-22 2002-05-30 Siemens Aktiengesellschaft Antennensystem
DE10207703B4 (de) 2002-02-22 2005-06-09 Kathrein-Werke Kg Antenne für eine Empfangs- und/oder Sendeeinrichtung insbesondere als Dachantenne für Kraftfahrzeuge
WO2004091039A2 (en) 2003-04-10 2004-10-21 Matsushita Electric Industrial Co. Ltd. Antenna element and antenna module, and electronic equipment using same
GB2416922B (en) * 2004-07-30 2009-03-04 Motorola Inc Antenna for use in a mobile radio communication device
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DE69714454T2 (de) 2002-11-14
WO1998015031A1 (en) 1998-04-09
DE69714454D1 (de) 2002-09-05
EP0929913A1 (de) 1999-07-21

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