EP1195845B1 - Antenne radioélectrique miniaturisée - Google Patents

Antenne radioélectrique miniaturisée Download PDF

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Publication number
EP1195845B1
EP1195845B1 EP01000519A EP01000519A EP1195845B1 EP 1195845 B1 EP1195845 B1 EP 1195845B1 EP 01000519 A EP01000519 A EP 01000519A EP 01000519 A EP01000519 A EP 01000519A EP 1195845 B1 EP1195845 B1 EP 1195845B1
Authority
EP
European Patent Office
Prior art keywords
antenna
metallization
substrate
conductor track
feed 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
EP01000519A
Other languages
German (de)
English (en)
Other versions
EP1195845A2 (fr
EP1195845A3 (fr
Inventor
Achim c/o Philips Corporate Intellectual Hilgers
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.)
Philips Intellectual Property and Standards GmbH
Koninklijke Philips NV
Original Assignee
Philips Intellectual Property and Standards GmbH
Koninklijke Philips Electronics NV
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 Philips Intellectual Property and Standards GmbH, Koninklijke Philips Electronics NV filed Critical Philips Intellectual Property and Standards GmbH
Publication of EP1195845A2 publication Critical patent/EP1195845A2/fr
Publication of EP1195845A3 publication Critical patent/EP1195845A3/fr
Application granted granted Critical
Publication of EP1195845B1 publication Critical patent/EP1195845B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q13/00—Waveguide horns or mouths; Slot antennas; Leaky-waveguide antennas; Equivalent structures causing radiation along the transmission path of a guided wave
    • H01Q13/08—Radiating ends of two-conductor microwave transmission lines, e.g. of coaxial lines, of microstrip lines
    • 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
    • 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
    • H01Q1/00—Details of, or arrangements associated with, antennas
    • H01Q1/36—Structural form of radiating elements, e.g. cone, spiral, umbrella; Particular materials used therewith
    • H01Q1/38—Structural form of radiating elements, e.g. cone, spiral, umbrella; Particular materials used therewith formed by a conductive layer on an insulating support
    • 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
    • H01Q5/342—Individual or coupled radiating elements, each element being fed in an unspecified way for different propagation modes
    • H01Q5/357—Individual or coupled radiating elements, each element being fed in an unspecified way for different propagation modes using a single feed point
    • 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
    • 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
    • H01Q9/045—Substantially flat resonant element parallel to ground plane, e.g. patch antenna with particular feeding means

Definitions

  • the invention relates to a miniaturized antenna having at least one ceramic substrate and a metallization, in particular for use in the high-frequency and Mikrowsllen Scheme.
  • the invention further relates to a circuit board and a mobile telecommunication device with such an antenna.
  • the antenna of such an electronic device such as a mobile phone
  • the antenna is a resonant component which has to be adapted to the respective application or operating frequency range.
  • wire antennas are used to convey the desired information. In order to achieve good radiation and reception properties with these antennas, certain physical lengths are absolutely necessary.
  • Optimal radiation conditions have so-called ⁇ / 2 dipole antennas whose length corresponds to half the wavelength ( ⁇ ) of the signal in free space.
  • the antenna is made up of two ⁇ / 4 long wires that are rotated by 180 degrees against each other. These dipole antennas are suitable for many applications, especially for the mobile Telecommunications are too large (in the GSM900 band, the wavelength is about 32 cm), is resorted to alternative antenna structures.
  • a widely used antenna, in particular for the field of mobile telecommunications, is the so-called ⁇ / 4 monopole. This consists of a wire with a length of one quarter of the wavelength. The radiation behavior of this antenna is acceptable with a simultaneously acceptable physical length (about 8 cm for the GSM band).
  • this type of antenna is characterized by a high impedance and radiation bandwidth, so that they are also used in systems that require a relatively high bandwidth.
  • this type of antennae chooses passive electrical matching. This usually consists of a combination of at least one coil and with a capacity which, with suitable dimensioning, adapts the input impedance of the ⁇ / 4 monopole, which is different from 50 Ohm, to the upstream 50 Ohm components.
  • the wire antennas are generally used as the extendable version in, for example, a cellular phone, the ⁇ / 4 monopoles can not be soldered directly to the circuit board. As a result, the information transfer between the circuit board and the antenna requires expensive contacts
  • Another disadvantage of this type of antenna is the mechanical instability of the antenna itself as well as the adaptation of the housing to the antenna required by this instability. For example, if a mobile phone falls on the ground, the antenna generally breaks down or the case is damaged at the point where the antenna can be pulled out.
  • EP 0 762 538 discloses chip antennas having a substrate and at least one conductor.
  • these antennas have the disadvantage that at least parts of the interconnects run within the substrate, and thus the substrate in several Layers and must be made with a certain minimum size, which can be relatively expensive.
  • this conductor track guide it is not possible with this conductor track guide to make an electrical adjustment of the conductors to a concrete installation situation in the finished state, since the conductor is no longer or only partially accessible.
  • EP 0 982 798 discloses an antenna comprising a substrate with a metallization.
  • the metallization is mounted on a first surface of the substrate and is formed by a metallization structure with a metallic signal feed line.
  • the antenna is mounted with its second surface opposite the first surface on a first surface of a base substrate having two separate electrodes on opposite sides of the base substrate. The distance between the first surface of the antenna and a non-antenna side of the base substrate determines the antenna gain.
  • This antenna has the disadvantage that parts of the metallization between the antenna and the base substrate run, and thus these parts are no longer accessible, so that a change in the antenna metallization in the installed state is no longer possible.
  • the base substrate with antenna metallised on both sides requires a considerable volume in a device which should have the smallest possible dimensions.
  • the invention is therefore based on the object to provide an antenna with at least one ceramic substrate and a metallization, in particular for use in the high-frequency and microwave range, which has a high mechanical stability and is particularly suitable for miniaturization.
  • an antenna is to be created in which can be at least largely dispensed with passive matching circuits and also for surface mounting with SMD (surface mounted device) technology on a Circuit board and for operation in the GSM or UMTS bands sufficiently high resonant frequency and impedance bandwidth is suitable.
  • SMD surface mounted device
  • an antenna is to be created in which the impedance matching in the installed state can be made.
  • a first metallization further comprises a first conductor portion which connects the at least first metallization plate to the conductor track, wherein the conductor track portion extends away from the first metallization plate in one direction from the feeder.
  • the antenna can be surface mounted (SMD) on a printed circuit board (along with the other components).
  • SMD surface mounted
  • the size of the antenna can be further reduced, and the antenna is mechanically much more stable and insensitive to external influences.
  • the embodiments according to claim 3 has the advantage that the production of the substrate and the surface metallization is technically relatively simple.
  • the embodiments described below have a substrate of a substantially block-shaped block whose height is about a factor of 3 to 10 smaller than its length or width.
  • the upper and lower (large) surfaces of the substrates in the representations of the figures are to be referred to as upper and lower end surfaces and the surfaces perpendicular thereto as side surfaces.
  • a cuboid substrate it is also possible, instead of a cuboid substrate, to select other geometric shapes, such as, for example, a cylindrical shape, to which a corresponding resonant strip conductor structure having, for example, a spiral shape is applied.
  • the substrates can be produced by embedding a ceramic powder in a polymer matrix and have a dielectric constant of ⁇ r > 1 and / or a permeability of ⁇ r > 1.
  • a first embodiment shown in Figure 1 includes a cuboid substrate 10 having a resonant wiring pattern 20, 30.
  • the substrate 10 is provided at the corners of its lower end face with a plurality of solder pads 11, with which it by surface mounting (SMD technique) on a circuit board can be soldered.
  • SMD technique surface mounting
  • a feed 12 in the form of a metallization which is soldered during assembly on a circuit board to a corresponding conductor region, via which the antenna is fed with radiated electromagnetic energy.
  • a first portion 21 of a conductor track 20 which then continues in a horizontal direction along the first side surface 13 to a second side surface 14.
  • the trace then continues in the horizontal direction along the second side surface 14 at about half its height as the second portion 22 and along one of the first side surface 13 opposite third side surface 15 at about half height as the third portion 23 in the region of the center of the third side surface 15th
  • the third conductor track section 23 then extends in the vertical direction as far as the end face in the illustration, where it is connected to a first conductor track section 31 of a (first) metallization structure 30 applied thereto.
  • the metallization structure 30 comprises the first conductor track section 31, which extends in the longitudinal direction of the substrate in the direction of the feed 12, and a substantially rectangular metallization plate 32, into which the first trace section 31 opens.
  • the effective length of the structure between the feed 12 and the metallization plate 32 corresponds to approximately half the wavelength of the signal to be radiated in the substrate.
  • this antenna combines several advantageous properties.
  • the antenna has a particularly high impedance bandwidth
  • the antenna has a very uniform, quasi omnidirectional directivity.
  • the dimensions of the ceramic substrate were about 17 x 11 x 4 mm 3 and the total length of the resonator structure formed of the trace 20 and the metallization structure 30 was about 39 mm.
  • the input impedance of the antenna is approximately 50 ohms.
  • This antenna is thus ideally suited for use in a mobile device, especially since it can also be applied (together with the other components) by surface mounting (SMD technology) to a circuit board, whereby the production is considerably simplified.
  • SMD surface mounting
  • Another advantage of this antenna is that by introducing a slot 211 (air gap) between the feed 12 and the first section 21 of the track, the input impedance of the antenna can be influenced and adapted to a specific installation situation. This is possible in the installed state of the antenna, for example by a laser trimming, in which the width and / or the length of the slot (and thus the capacitive coupling between the feed 12 and the resonator structure 20, 30) is increased by a laser beam until a optimal adaptation is achieved.
  • the tuning is preferably performed so that the particularly large bandwidth of the first harmonic of the resonance frequency is used to cover the GSM bands.
  • the antenna can also be designed for use in the UMTS band (1970 to 2170 MHz).
  • FIG. 4 shows a second embodiment of the antenna.
  • This antenna is formed by a substrate 10 with a resonant metallic trace structure 20, 30, 40, which is composed essentially of three parts, namely a common trace 20 according to FIG. 4a, a first metallization structure 30 on the upper (first) end face of the substrate (FIG. 4b) and a second metallization structure 40 on the opposite lower (second) end face of the substrate (FIG. 4c), wherein these structures 30, 40 are fed through the conductor 20.
  • a resonant metallic trace structure 20, 30, 40 which is composed essentially of three parts, namely a common trace 20 according to FIG. 4a, a first metallization structure 30 on the upper (first) end face of the substrate (FIG. 4b) and a second metallization structure 40 on the opposite lower (second) end face of the substrate (FIG. 4c), wherein these structures 30, 40 are fed through the conductor 20.
  • a feed 12 in the form of a metallization piece is in turn arranged on the lower end face of the substrate 10 in the region of the center of a first side face 13, which is soldered in the surface mounting of the antenna to a conductor region, via which the antenna is fed with electromagnetic energy.
  • a first section 21 of the conductor track 20 at the first side face 13 initially extends vertically in the direction of the upper end face and then in the horizontal direction up to a second side face 14.
  • the trace 20 extends as a second section 22 further along the second side surface 14 and as a third portion 23 along one of the first side surface 13 opposite third side surface 15 at which the third portion ends with a along an edge to a fourth side surface 16 perpendicularly extending T-like end piece 231.
  • a first (upper) limb of the end piece 231 extending in the direction of the upper end face is connected to the first metallization structure 30, which comprises a first section 31 extending in the longitudinal direction of the substrate 10 in a manner similar to the first embodiment Direction extends to the feed 12 and finally into a first, substantially rectangular metallization plate 33 opens.
  • the first portion 31 is connected to the upper leg of the end piece 231 via a second track portion 32, which runs along the edge to the third side surface 15.
  • a lower limb of the end piece 231 extending in the direction of the lower end face is connected to the second metallization structure 40, which in a manner similar to the first metallization structure 30 is connected by a first Section 41 is formed, which extends in the longitudinal direction of the substrate in the direction of the feed 12 and finally in a second, substantially rectangular Metallmaschinesplättchen 43 opens.
  • a second section 42 extending along the edge to the third side face 15 is provided, which establishes a connection between the lower leg of the end piece 231 and the first section 41.
  • the effective length of the structures between the feed 12 and the first metallization plate 33 and between the feed 12 and the second metallization plate 43 again corresponds to approximately half the wavelength of the signal to be radiated in the substrate.
  • this second embodiment of the antenna can be mounted by surface mounting on a printed circuit board (SMD technique). Furthermore, a very uniform, quasi omnidirectional directional characteristic can be achieved both in the horizontal direction and in the direction perpendicular thereto.
  • SMD technique printed circuit board
  • the two metallization structures 30, 40 slightly different, that is, with different lengths or widths, with different coupling (for example, by a slot 211 variable width and / or length) to the common conductor track 20 or with different sizes of the first and second metallization plates 33, 43 are formed, two resonance frequencies are excited, which are shifted according to these deviations from each other.
  • the first metallization structure 30 generates a somewhat lower resonant frequency than the second metallization structure 40.
  • the number of these resonances can be increased by, for example, applying one or more further substrates with the same or similar resonant conductor track structures 20, 30, 40 to the substrate shown in FIG. This is relatively easy to manufacture, especially with the introduction of multilayer technology manufacturing technology. Furthermore, in the case of a layer structure comprising two substrates, a further resonance can be generated between these substrates.
  • the position and the spacing of the resonance frequencies can be adjusted as desired by appropriate choice of the dimensions of the substrates as well as of the resonant structures 20, 30, 40 , This also applies to the adaptation of the impedance of the antenna to the feeder wherein here by a corresponding change in the achieved with a variable slot 211 capacitive coupling, for example by Auslägerung and / or broadening of the slot with a laser beam (laser trimming), a setting on a concrete installation situation is possible.
  • Another advantage of this embodiment results in connection with the steepness of the impedance curve in the range of the resonance frequencies.
  • the steepness of this curve can provide a filtering effect of the antenna between the transmit and receive frequencies which can be used to reduce or even eliminate the requirements for the upstream and downstream filter circuits.
  • separate feeds are preferably provided for each of the first and second metallization structures 30, 40.
  • the dimensions of the ceramic substrate were about 17 x 11 x 4 mm 3 and the total length of the trace 20 and the first metallization structure 30 and the second metallization structure, respectively 40 each about 39 mm. This resulted in the course of the impedance spectrum shown in FIG. 5, in which the two resonance peaks are clearly recognizable.
  • FIG. 6 schematically shows a printed circuit board (PCB) 100 to which an antenna 110 according to the invention has been applied together with other components in the areas 120 and 130 of the circuit board 100 by surface mounting (SMD).
  • SMD surface mounting
  • the antenna according to the invention can also be used in the GSM1800 (DCS) band, in the UMTS band and in the Bluetooth band (BT band at 2480 MHz) with appropriate dimensioning.
  • DCS GSM1800
  • UMTS UMTS
  • Bluetooth band BT band at 2480 MHz
  • the antenna can also be composed of a plurality of ceramic substrates with the same or different dielectric and / or permeable properties, each with a surface metallization.

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Details Of Aerials (AREA)
  • Waveguide Aerials (AREA)
  • Constitution Of High-Frequency Heating (AREA)
  • Support Of Aerials (AREA)

Claims (9)

  1. Antenne avec au moins un substrat céramique (10) et une métallisation, le substrat (10) présentant une surface d'about supérieure, une surface d'about inférieure et au moins une surface latérale et la métallisation étant une métallisation de surface, laquelle
    - contient une alimentation (12) pour l'énergie électromagnétique à rayonner qui se trouve sur la surface d'about inférieure du substrat,
    - contient au moins une première structure de métallisation (30) qui se trouve sur la surface d'about supérieure du substrat, et
    - contient une piste conductrice (20) s'étendant le long d'une surface latérale au moins du substrat (10), qui relie électriquement l'alimentation (12) avec la première structure de métallisation (30),
    et dans laquelle la première structure de métallisation (30) comprend une première plaquette de métallisation (32),
    caractérisée en ce
    que la première structure de métallisation (30) comprend par ailleurs un premier segment de piste conductrice (31) qui relie la première plaquette de métallisation (32) au moins avec la piste conductrice (20), le segment de la piste conductrice (31) s'étendant de la première plaquette de métallisation (32) dans une direction opposée à l'alimentation.
  2. Antenne selon la revendication 1,
    caractérisée en ce
    que l'alimentation (12) se trouve dans la région du milieu d'une première surface latérale (13) sur la surface d'about supérieure du substrat (11) et la piste conductrice (20) s'étend avec des premier, deuxième ou troisième (21, 22, 23) segments le long de la première, de la deuxième et d'au moins une partie de la troisième surface latérale (13, 14, 15) du substrat (10).
  3. Antenne selon la revendication 1,
    caractérisée en ce
    qu'une deuxième structure de métallisation (40) est appliquée sur la surface d'about inférieure du substrat (10) et est reliée avec la piste conductrice (20) et comprend un premier segment de piste conductrice (41) s'étendant depuis un côté du substrat opposé à l'alimentation (12) dans la direction de l'alimentation ainsi qu'une deuxième plaquette de métallisation (42).
  4. Antenne selon la revendication 3,
    caractérisée en ce
    que les première et deuxième structures de métallisation (30, 40) comprennent chacune un deuxième segment de piste conductrice (32 ; 42) qui s'étend respectivement le long d'un côté vers la troisième surface latérale (15) du substrat (10) opposée à l'alimentation (12) et se prolonge respectivement par le premier segment de piste conductrice (31 ; 41).
  5. Antenne selon la revendication 4,
    caractérisée en ce
    que le troisième segment (23) de la piste conductrice (20) s'étend jusqu'à un bord de la troisième surface latérale (15) avec une quatrième surface latérale (16) du substrat (10) et évolue à son extrémité en une pièce d'extrémité (231) semblable à un T dont les bords libres sont à chaque fois reliés avec le deuxième segment de la piste conductrice (32 ; 42).
  6. Antenne selon la revendication 1,
    caractérisée en ce
    que, dans la piste conductrice (20), est ménagée une fente (211) s'étendant dans une direction essentiellement perpendiculaire à celle-ci dont la longueur et la largeur sont choisies de telle sorte qu'une adaptation d'impédance de l'antenne à une situation d'intégration concrète est atteinte.
  7. Antenne selon le préambule de la revendication 1,
    caractérisée en ce
    qu'elle se compose de plusieurs substrats céramiques avec, à chaque fois, une métallisation de surface selon la partie caractérisante de la revendication 1.
  8. Carte à circuits imprimés, en particulier pour le montage en surface de composants électroniques,
    caractérisée par une antenne selon l'une des revendications précédentes.
  9. Appareil de télécommunication mobile, en particulier pour la gamme GSM ou UMTS,
    caractérisé par une antenne selon l'une des revendications 1 à 7.
EP01000519A 2000-10-09 2001-10-05 Antenne radioélectrique miniaturisée Expired - Lifetime EP1195845B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE10049844A DE10049844A1 (de) 2000-10-09 2000-10-09 Miniaturisierte Mikrowellenantenne
DE10049844 2000-10-09

Publications (3)

Publication Number Publication Date
EP1195845A2 EP1195845A2 (fr) 2002-04-10
EP1195845A3 EP1195845A3 (fr) 2004-01-02
EP1195845B1 true EP1195845B1 (fr) 2006-05-03

Family

ID=7659079

Family Applications (1)

Application Number Title Priority Date Filing Date
EP01000519A Expired - Lifetime EP1195845B1 (fr) 2000-10-09 2001-10-05 Antenne radioélectrique miniaturisée

Country Status (7)

Country Link
US (2) US6680700B2 (fr)
EP (1) EP1195845B1 (fr)
JP (1) JP4017852B2 (fr)
KR (1) KR20020028800A (fr)
CN (1) CN1349277A (fr)
DE (2) DE10049844A1 (fr)
TW (1) TW529206B (fr)

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US20040130495A1 (en) 2004-07-08
US6680700B2 (en) 2004-01-20
US20020067312A1 (en) 2002-06-06
JP4017852B2 (ja) 2007-12-05
KR20020028800A (ko) 2002-04-17
EP1195845A2 (fr) 2002-04-10
DE10049844A1 (de) 2002-04-11
DE50109679D1 (de) 2006-06-08
EP1195845A3 (fr) 2004-01-02
CN1349277A (zh) 2002-05-15

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