EP0818847A2 - Structure d'antenne - Google Patents

Structure d'antenne Download PDF

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Publication number
EP0818847A2
EP0818847A2 EP97810427A EP97810427A EP0818847A2 EP 0818847 A2 EP0818847 A2 EP 0818847A2 EP 97810427 A EP97810427 A EP 97810427A EP 97810427 A EP97810427 A EP 97810427A EP 0818847 A2 EP0818847 A2 EP 0818847A2
Authority
EP
European Patent Office
Prior art keywords
metal surface
resonator element
antenna construction
short
construction according
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.)
Withdrawn
Application number
EP97810427A
Other languages
German (de)
English (en)
Other versions
EP0818847A3 (fr
Inventor
Ulrich Dr. Dersch
Matthias Liebendörfer
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.)
Ascom Tech AG
Original Assignee
Ascom Tech AG
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Ascom Tech AG filed Critical Ascom Tech AG
Publication of EP0818847A2 publication Critical patent/EP0818847A2/fr
Publication of EP0818847A3 publication Critical patent/EP0818847A3/fr
Withdrawn legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q9/00—Electrically-short antennas having dimensions not more than twice the operating wavelength and consisting of conductive active radiating elements
    • H01Q9/04—Resonant antennas
    • H01Q9/30—Resonant antennas with feed to end of elongated active element, e.g. unipole
    • 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
    • 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
    • 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

Definitions

  • the invention relates to an antenna construction, in particular for handheld radios, and a handheld radio with such an antenna construction.
  • the cell phones currently available on the market have the GSM standard predominantly an external antenna, which mostly functions as a ⁇ / 4 monopole. It is known that the space required for the antenna (in particular the length) is reduced can be, if the antenna is wound into a helix. In combination with an extendable monopole antenna is capable of this construction in purely electrical View of the big requirements of the GSM standard regarding bandwidth and Efficiency enough. To increase comfort, reduce the risk of damage and improving the design options, it is desirable that the antenna can be completely housed in the housing. For applications with low bandwidth and radiated power requirements (e.g. for cordless phones according to the DECT standard) antennas already exist are integrated in the housing. However, these known antenna designs are for GSM specifications not suitable.
  • the object of the invention is to provide an antenna construction that is small Has space requirements (and can therefore be integrated into flat housings) and which is suitable for higher bandwidths and services (such as those used by GSM are prescribed).
  • the antenna is essentially replaced by one serving as a base plate Metal surface and an L-shaped plate acting as a resonator element educated.
  • the L-shaped plate is guided at a distance around an edge of the metal surface. That is, a short leg of the plate ends at a predetermined first distance A1 with respect to a direction "beyond" the edge lying in the plane of the metal surface.
  • a long leg of the plate is at a predetermined second (middle) distance A2 held “over” the metal surface. The said second leg typically runs more or less parallel to the metal surface.
  • the transition between the long and the short leg can be angular or round be trained.
  • the distance A2 between the resonator element and the metal surface need not be the same at every point.
  • Resonator element and Metal surface can e.g. B. slightly curved or at a small angle to each other stand.
  • the distance mentioned can vary locally. Overall, he is moving within a given range or varies around a certain mean around.
  • the resonator element can therefore be an inside of a device housing be formally adapted. It also does not bother when electronic components are removed from the Protrude metal surface.
  • the inventive design and placement of the resonator element does it possible, the height (in a direction perpendicular to the metal surface) - without essential Loss of bandwidth - to minimize. In this sense, the distance A2 becomes smaller chosen as the distance A1.
  • a short-circuit element provided between the metal surface and the resonator element is essentially in the direction defined by the extension of the metal surface Level led. It can e.g. B. run straight in an extension of the metal surface. But it can also - especially with the variant explained below with the "Box" volume - thanks to a connecting tab that is perpendicular to the metal surface be educated.
  • the supply runs essentially parallel to the short-circuit element from the metal surface out to the resonator element.
  • the exact starting point (location) of the feed and in particular their distance from the short-circuit element can be varied in order to achieve the desired adaptation of the antenna according to the invention. Starting point and distance are to be determined in individual cases and can be optimized as required will.
  • the metal surface defines box-shaped volume.
  • the resonator element according to the invention is at a distance from one (preferably face) edge of the box-shaped volume. Its mechanical support can u. U. alone by the asymmetrically arranged Short circuit element take place. Depending on the type of supply, this may also be possible contribute to stabilization.
  • the construction becomes particularly stable when using a dielectric support body or when attaching the resonator element to a plastic housing surrounding the antenna.
  • the metal surface can also be formed by the metallization of a printed circuit board. On this circuit board are also the electronic components of the circuit (transmitter, receiver, Control, data processing).
  • the short-circuit element is z. B. formed by a soldered or clamped tab (which in the by the PCB defined level can be). It can also be preferably by a printed, flat metallization can be formed directly on the circuit board. The feed is then z. B. as a microstrip line on the circuit board from the circuit to Resonator element performed on the board.
  • the box-shaped volume is preferably enclosed on all sides by the metal surface.
  • a circuit located in the volume is efficiently shielded.
  • the volume is as flat as possible sought.
  • applications are also conceivable in which it is not primarily based on a volume of low height arrives. It is of course not mandatory that the volume is enclosed on all sides. Narrow and end faces can be partial or be fully open.
  • any more or less cuboid volume can be understood as a box-shaped volume be (cigarette box shape).
  • the edges can be square or rounded be.
  • the different side surfaces do not have to be parallel to each other.
  • You can e.g. B. designed according to the formal specifications of the design Outer housing of the radio telephone may be inclined or curved.
  • the surface formed by the metal surface comprises e.g. B. two oblong rectangular Main areas (in - a small mutual in relation to the transverse dimension Distance) and at least one short connecting face.
  • the resonator element covers the named end face and an adjacent area of one Main area (of course, while maintaining a certain distance).
  • the antenna is e.g. B. an inner conductor of a coaxial line (or a microstrip line) led through the metal surface to the edge of the resonator element.
  • the short leg of the resonator plate can be connected to the metal surface angled) tab are fed.
  • the short-circuit element can be a connecting strip be in an extension of a narrow side of the box-shaped Volume lies. In order for the resonance condition to be met, the short-circuit element must be arranged in the region of a corner of the resonator plate.
  • Supply and short circuit can be in the same or different (e.g. perpendicular to each other standing) levels.
  • the resonator element should be at a smaller distance from the main surface than from short connecting face. While the first mentioned distance also determines for the overall height of the (to be designed as flat as possible for design reasons) Handheld radio, the second distance only goes into the (not particularly critical) longitudinal dimension.
  • the body can e.g. B. an L-shaped angled substrate with a selectively applied metal coating (to form the resonator plate, supply and short circuit).
  • the antenna according to the invention can also be designed such that the resonator element with the short-circuit element and five flat pieces of the box-shaped Metal surface consists of a piece of partially metallized plastic.
  • the plastic part need not be completely metallized.
  • the non-metallized parts can contribute to mechanical strength.
  • the attached circuit board with the electronic Components and the printed die form complete the metal surface on the one hand to a closed surface of a box and on the other hand closes it Resonator element to the supply voltage.
  • Another advantageous embodiment variant is that the resonator element on the inside of the plastic housing of the mobile phone or on one flexible film or a thin circuit board substrate is applied.
  • the mechanical Support then of course does not have to be taken over by the short-circuit element will.
  • the resonator element has a circumference corresponding to half a wavelength ⁇ of the resonance vibration. Since the resonance-active length of the resonator element should be approximately ⁇ / 4 (resonance condition), the short-circuit element should therefore be placed in the corner if possible.
  • the box-shaped volume can e.g. B. have a dimension of 0.33 x 0.15 x 0.015 ⁇ 3 .
  • the distance between the connecting end face and the angled part of the resonator element can e.g. B. 0.03 ⁇ .
  • the distance to the main surface is z. B. just about 0.01 ⁇ .
  • Fig. 1a shows a box-shaped metal surface 1 with two parallel to each other at a short distance arranged main surfaces 1.1, 1.2, an upper and a lower short End face 1.3 or 1.4 and two long narrow side faces 1.5, 1.6.
  • the shape is comparable to that of an elongated flat cigarette box.
  • an L-shaped angled resonator element 5 is held. At a certain distance from edge 2 (which between main surface 1.2 and End face 1.3 is formed) an L-shaped angled resonator element 5 is held. To support a short-circuit element 4 and - depending on the mechanical Execution - possibly serve a feed.
  • the width of the resonator element corresponds to that of the main surface 1.2.
  • a angled short side 5.1 is slightly larger than the end face 1.3 (accordingly the distance A2 between resonator element 5 and main surface 1.2).
  • the said short side 5.1 has a distance A1 from the end face 1.3 and ends approximately in the Extension of a geometric plane defined by the main surface 1.1.
  • the Long side 5.2 preferably angled by 90 ° covers the uppermost area the main area 1.2.
  • the short-circuit element 4 is, for. B. a strip-shaped extension of the side surface 1.5. It can be as wide as the mentioned side surface 1.5 or narrower.
  • Power is supplied from the shielded volume.
  • a microstrip 3.1 (or an inner conductor of a coaxial line) through the End face 1.3 led to the short side 5.1.
  • the supply is in the range of Main surface 1.1 or the side surface 1.5 arranged (the distance from the short-circuit element 3.1 is determined by the required adjustment).
  • the circuit for Control of the antenna is in the flat formed within the metal surface 1 Volume housed. The metal surface 1 thus forms the shield housing Circuit electronics.
  • the supply (microstrip line 3.1) is more or in the example shown less in the geometric plane and formed by the main surface 1.1 closes at the edge or near the edge of the angled short side 5.1 of the resonator element 5.
  • the variant shown in FIG. 1b differs from FIG. 1a with regard to the feed and the positioning of the short-circuit element 4.
  • the microstrip line 3.1 (or an inner conductor of a coaxial line) is connected to a tab 3.2, which is essentially perpendicular to the short side 5.1 and protrudes towards the end face 1.3.
  • the short-circuit element 4 is not in the extension of the side surface 1.5, but in the extension of the main area 1.1.
  • the feed (tab 3.2 and microstrip line 3.1) and the short-circuit element 4 are in one spaced from each other by the desired adjustment.
  • 1c shows a further alternative in which the resonator element is rounded is.
  • the transition between the long side 5.2 and the short side 5.1 is not here by a pronounced edge, but by a continuously curved or curved transition formed.
  • the radius of curvature is of the order of magnitude the distances A1 and A2.
  • round transitions to one can lead to a wider range. Is the bandwidth - by replacing the square resonator element by a round - too large, it can by a reduction in the distance A1 or A2 can be reduced again.
  • the thickness (or Overall height) of the entire antenna construction can be achieved by using rounded Resonator elements are advantageously kept small.
  • FIG. 1c the short circuit 4 is positioned similar to that in FIG. 1b.
  • FIGS. 1a to 1c are therefore different variants for the Placement of short circuit and supply can be seen. Of course, too other arrangements possible according to the required distance between these two elements.
  • the distance between the end face 1.3 and the short side 5.1 is z. B. 0.03 ⁇ , that between the long side 5.2 and the main surface 1.2 about 0.01 ⁇ . The second distance is therefore a multiple (e.g. 3 times) smaller than the former.
  • the width of the resonator element 5.1 is essentially same as the width B of the metal box.
  • the length X1 of the short side 5.1 is z. B. 0.025 ⁇ , while the length X2 of the long side 5.2 measures 0.07 ⁇ .
  • the long side is e.g. B. more than twice as long as the short side 5.1.
  • the distance between the supply and the short-circuit element 4 can be adjusted the antenna can be varied to the required 50 ⁇ input impedance.
  • the dimensioning mentioned above as an example was 0.037 ⁇ .
  • the wavelength is in the range of 30 cm.
  • the resonator element 5 is angled in the manner shown in FIG. 1a or is bent round, the height in the critical environment of the To feed and the short-circuit element 4 in the longitudinal axis of the housing, where there is more space.
  • the resonator element can have a low height above the radiation-side metal surface (i.e. the main surface 1.2).
  • the box-shaped metal surface 1 carries as a counterweight to the radiation and also ensures a good radiation, when the antenna element by the hand of the cellular phone user is covered.
  • the input impedance of the antenna according to the invention is approximately 50 ⁇ real. In terms of the condition that the reflection loss should be less than 10 dB achieved a bandwidth of 20%. This value lies - with good efficiency and more compact Dimension - above the corresponding requirements of the GSM standard. Outstanding is the low detunability of the antenna by the hand or the head of the Phone user. As an antenna in the medium of air, it has exceptional efficiency of over 90% and largely independent of the radiated power (up to 2 watts for GSM). Nevertheless, the geometric dimensions are small and optimally adapted for integration into a handheld device. The radiation diagram points a predominantly omnidirectional characteristic. The following are some simple ones and inexpensive antenna designs are described.
  • Fig. 2 shows a dielectric body 6 with two perpendicular to each other Share 6.1, 6.2.
  • an all-over Metal coating 7.1, 7.2 attached, which the resonator element 5 in Fig. 1a corresponds.
  • On a side of the part opposite the metal coating 7.1 6.2 is a narrow strip-shaped metal coating 7.3 which the Supply (microstrip line 3.1 / tab 3.2) in Fig. 1a, 1b corresponds.
  • a metal coating 7.4 On the L-shaped The side surface in the area of part 6.2 is a metal coating 7.4 as a short-circuit element attached (cf. short-circuit element 4 in Fig. 1 a).
  • the resonator construction shown in FIG. 2 can be placed on the outside of a suitably dimensioned shielding housing.
  • the dimensions are such that the end result is a structure comparable to that of FIG. 1a (metal coating 7.3 aligned with a main surface of the shielding housing and metal coating 7.4 aligned with a side surface of the same).
  • the body 6 forms a dielectric medium ( ⁇ r > 1) and can lead to a reduction in the antenna dimensions.
  • the resonator construction shown in FIG. 2 is mechanically stable and can also define the distances between the resonator element and the shielding housing in a defined manner without any special assembly effort.
  • the antenna With the same resonance frequency, the antenna can be made smaller. However, the bandwidth decreases with increasing dielectric constant ⁇ r . Conversely, the bandwidth and the size of the antenna can be adjusted by the appropriate choice of the material properties of the substrate.
  • Fig. 3 shows how the resonator element from a piece of sheet 8, which has two tabs 12, 13 for the supply or the short circuit, can be produced.
  • the essentially rectangular sheet 8 has a bending line 9 at a suitable point, so that the sheet 8 can be bent L-shaped.
  • the tabs 12, 13 also have over bending lines 10, 11 for right-angled turning. That so shaped Sheet metal is on the tabs 12 and 13 with the corresponding contacts on the shield housing soldered.
  • On the soldering z. B. be dispensed with if the bent Sheet metal when assembling the mobile device between the plastic housing and the shielding housing arranged therein is clamped. Short circuit element and supply are then connected to the corresponding contacts on the shield housing pressed.
  • the embodiment shown in Fig. 4 represents a structurally simple variant without Shield housing.
  • the starting point is a circuit board 14 with a metallization 15 on the back and equipped with various electronic components 16 on the front side.
  • various electronic components 16 on the front side.
  • On a front edge 19 (which runs perpendicular to the plane of the drawing in the chosen representation) is over a short-circuit tab 18 is connected to a resonator plate 17 according to the invention.
  • the feed runs in the same plane as the short-circuit tab 18 (and is therefore not visible in the representation according to FIG. 4).
  • the short leg 17.1 So ends at a certain distance "beyond" the edge 19.
  • the long second Leg 17.2 runs as close as possible above the (dielectric) Printed circuit board 14.
  • the antenna is controlled by the circuit board 14 implemented circuit.
  • the embodiment shown in Fig. 4 can additionally by a shield housing the electronic circuit can be expanded. Then preferably resonator element and shield housing made of a metallized piece of plastic, the electrically conductive parts being formed by the partial metallization will. By folding this plastic part with the circuit board in one Process a) assembles the antenna, b) creates a contact and c) the electronic Shielded circuit.
  • FIGS. 5a to 5c shows a circuit board 20 in plan view.
  • the contact strip 22 is interrupted so that the microstrip conductor 24 is out of the range 21 can be brought out.
  • the contact strip 22 is with the electrical Ground of the circuit board connected (which is e.g. on the back of the insulating Carrier is located).
  • Contact strips are e.g. B. holes 25.1 to 25.4 are provided.
  • Fig. 5b shows a lid-like second part, the shield 26 and the resonator element 27 includes.
  • This second part is e.g. B. by a selectively metallized Plastic molding formed.
  • the shield 26 has four narrow sides 26.1 to 26.4 and a main surface 26.5.
  • the main area 26.5 is approximately the same size as the area 21.
  • the edges of the narrow sides 26.1 to 26.4 come on the contact strip 22 to lie when the plastic molded part according to FIG. 5b on the printed circuit board 20 according to Fig. 5a is placed. So a closed, box-shaped volume is formed, in which the components 23 can be accommodated.
  • the resonator element 27 is by the short-circuit element 28, which is on a Extension of the narrow side 26.3 lies, and optionally by an additional support element 30, which is mirror-symmetrical to the short-circuit element 28 in one Extension of the narrow side 26.1 is formed, worn.
  • a support element can be provided at the end 31 thereof be carried by the main surface 26.5.
  • a contact element 29 is formed on the resonator element 27 at the desired location. It can e.g. B. is a small feather.
  • the contact element 29 sits on the contact point 24.1 at the outer end of the Microstrip conductor 24.
  • a recess 33 in the narrow side 26.4 forms an opening for the microstrip line in the shield.
  • posts 32.1 to 32.4 are provided, which with the holes 25.1 to 25.4 correlate and allow the two parts to be screwed together so that the in Fig. 5c shown structure arises.
  • circuit board If the circuit board is equipped with components on both sides, it is natural shield the "back" with a lid. The effective one for the antenna The metal surface is then this second cover (and not the mass of the circuit board). Of the said second cover is indicated in Fig. 5c by a dashed line.
  • the antenna designs described above can be used in various ways can be varied. So z. B. rounded the shape of the resonator element instead be rectangular or have various small indentations and tabs to to enclose or envelop protruding components. There may also be holes in the resonator element be provided, for example, larger circuit elements To make room. It is also easily conceivable that a larger number of holes is present. The diameter of a hole is usually not greater than the distance A1 or A2 mentioned above. This allows a kind Grid structure arise. Further cuts can be made in places that do not have high current flows show be provided. The angle between the smaller and the larger Part of the L-shaped resonator element can deviate from 90 ° and advantageously be rounded. For fine tuning, you can use the resonator element Extensions are formed, the length of which influence the resonance frequency.
  • the short-circuit element can be the same width, wider or narrower than the side surface. It even takes not even necessarily lying in the plane of the side surface. It can e.g. B. to the Edge of one of the two main surfaces.
  • Is z. B the resonator element through a copper layer on a flexible film formed (flexible circuit board), then a rounded bend is created.
  • the foil is inserted into the plastic housing and in the correct shape held.
  • the contacts can in turn be ensured by soldering or pressing will.
  • the copper layer can be coated in a manner known per se with a photochemical Procedures can be printed on the film.
  • the antenna according to the invention is proportional has a high bandwidth of around 20% with a comparatively low overall height of a few millimeters.
  • the antenna is not very sensitive to nearby ones Body parts (such as the hand or head of the phone user). It fulfills that Requirements of the GSM standard and allows full integration in the Plastic housing.

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Support Of Aerials (AREA)
EP97810427A 1996-07-10 1997-07-02 Structure d'antenne Withdrawn EP0818847A3 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CH173196 1996-07-10
CH1731/96 1996-07-10

Publications (2)

Publication Number Publication Date
EP0818847A2 true EP0818847A2 (fr) 1998-01-14
EP0818847A3 EP0818847A3 (fr) 1998-12-02

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ID=4217283

Family Applications (1)

Application Number Title Priority Date Filing Date
EP97810427A Withdrawn EP0818847A3 (fr) 1996-07-10 1997-07-02 Structure d'antenne

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EP (1) EP0818847A3 (fr)

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1999043045A1 (fr) * 1998-02-23 1999-08-26 Qualcomm Incorporated Antenne equipee de deux elements rayonnants actifs
EP1020947A2 (fr) * 1998-12-22 2000-07-19 Nokia Mobile Phones Ltd. Méthode de produuction d'un corps d'antenne pour téléphone et combiné téléphonique comprenant une antenne interne
EP1137097A1 (fr) * 2000-03-23 2001-09-26 Ascom Systec AG Structure d'antenne
JP2004128605A (ja) * 2002-09-30 2004-04-22 Murata Mfg Co Ltd アンテナ構造およびそれを備えた通信装置
WO2006070233A1 (fr) 2004-12-31 2006-07-06 Nokia Corporation Antenne multibande interne a elements plats de type bande
WO2006129239A1 (fr) * 2005-05-31 2006-12-07 Nxp B.V. Ensemble d'antenne plan a adaptation d'impedance et a interaction reduite avec l'utilisateur, pour un equipement de communication rf
EP1657785A4 (fr) * 2003-08-22 2013-12-11 Murata Manufacturing Co Structure d'antenne et unite de communication utilisant ladite structure

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH05299929A (ja) * 1992-04-22 1993-11-12 Sony Corp アンテナ

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JPS58104504A (ja) * 1981-12-16 1983-06-22 Matsushita Electric Ind Co Ltd 無線機用アンテナ
JPS6047522A (ja) * 1983-08-26 1985-03-14 Nippon Telegr & Teleph Corp <Ntt> 携帯無線機
AT393054B (de) * 1989-07-27 1991-08-12 Siemens Ag Oesterreich Sende- und/oder empfangsanordnung fuer tragbare geraete
JPH03228407A (ja) * 1989-12-11 1991-10-09 Nec Corp アンテナおよび該アンテナを用いた携帯用無線機
CN1094663C (zh) * 1994-03-08 2002-11-20 泰利泰尔有限责任公司 手持式发送和/或接收装置
JPH08330827A (ja) * 1995-05-29 1996-12-13 Mitsubishi Electric Corp アンテナ装置

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH05299929A (ja) * 1992-04-22 1993-11-12 Sony Corp アンテナ

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1999043045A1 (fr) * 1998-02-23 1999-08-26 Qualcomm Incorporated Antenne equipee de deux elements rayonnants actifs
US6184833B1 (en) 1998-02-23 2001-02-06 Qualcomm, Inc. Dual strip antenna
EP1020947A2 (fr) * 1998-12-22 2000-07-19 Nokia Mobile Phones Ltd. Méthode de produuction d'un corps d'antenne pour téléphone et combiné téléphonique comprenant une antenne interne
EP1137097A1 (fr) * 2000-03-23 2001-09-26 Ascom Systec AG Structure d'antenne
JP2004128605A (ja) * 2002-09-30 2004-04-22 Murata Mfg Co Ltd アンテナ構造およびそれを備えた通信装置
EP1657785A4 (fr) * 2003-08-22 2013-12-11 Murata Manufacturing Co Structure d'antenne et unite de communication utilisant ladite structure
WO2006070233A1 (fr) 2004-12-31 2006-07-06 Nokia Corporation Antenne multibande interne a elements plats de type bande
CN101258641A (zh) * 2004-12-31 2008-09-03 诺基亚公司 带有平面带元件的内置多波段天线
WO2006129239A1 (fr) * 2005-05-31 2006-12-07 Nxp B.V. Ensemble d'antenne plan a adaptation d'impedance et a interaction reduite avec l'utilisateur, pour un equipement de communication rf
US7884769B2 (en) 2005-05-31 2011-02-08 Epcos Ag Planar antenna assembly with impedance matching and reduced user interaction for a RF communication equipment

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Publication number Publication date
EP0818847A3 (fr) 1998-12-02

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