EP1014489B1 - Antenne résonateur diélectrique - Google Patents

Antenne résonateur diélectrique Download PDF

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Publication number
EP1014489B1
EP1014489B1 EP99204261A EP99204261A EP1014489B1 EP 1014489 B1 EP1014489 B1 EP 1014489B1 EP 99204261 A EP99204261 A EP 99204261A EP 99204261 A EP99204261 A EP 99204261A EP 1014489 B1 EP1014489 B1 EP 1014489B1
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EP
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Prior art keywords
dielectric resonator
resonator antenna
dra
antenna
dielectric
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
EP99204261A
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German (de)
English (en)
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EP1014489A3 (fr
EP1014489A2 (fr
Inventor
Rebekka Philips Corp. Int. Prop. GmbH. Porath
Frank Philips Corp. Int. Prop. GmbH. Heinrichs
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Philips Intellectual Property and Standards GmbH
Koninklijke Philips NV
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Philips Intellectual Property and Standards GmbH
Koninklijke Philips Electronics NV
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Publication of EP1014489A3 publication Critical patent/EP1014489A3/fr
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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
    • H01Q13/20—Non-resonant leaky-waveguide or transmission-line antennas; Equivalent structures causing radiation along the transmission path of a guided wave
    • H01Q13/24—Non-resonant leaky-waveguide or transmission-line antennas; Equivalent structures causing radiation along the transmission path of a guided wave constituted by a dielectric or ferromagnetic rod or pipe
    • 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
    • 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
    • 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
    • H01Q9/0485—Dielectric resonator antennas

Definitions

  • the invention relates to a dielectric resonator antenna (DRA).
  • DRA dielectric resonator antenna
  • the invention further relates to a transmitter, a receiver and a mobile radio device with a dielectric resonator antenna.
  • Dielectric resonator antennas are known as miniaturized antennas made of ceramic or another dielectric for microwave frequencies.
  • a dielectric resonator the dielectric of which is surrounded by air with a dielectric constant of ⁇ r >> 1, has a discrete spectrum of natural frequencies and natural modes due to the electromagnetic boundary conditions at the interfaces of the dielectric. These are defined by the special solution of the electromagnetic equations for the dielectric under the given boundary conditions at the interfaces.
  • the radiation of power is in the foreground with a resonator antenna. Since no conductive structures are used as the radiating element, the skin effect cannot have a negative effect.
  • Such antennas therefore have low ohmic losses at high frequencies.
  • a compact, miniaturized structure can also be achieved, since the dimensions can be reduced for a preselected natural frequency (transmission and reception frequency) by increasing ⁇ r .
  • the dimensions of a DRA given frequency are approximately inversely proportional to ⁇ r .
  • An increase in ⁇ r by a factor ⁇ thus results in a reduction in all dimensions by a factor ⁇ and thus the volume by a factor ⁇ 3/2 with a constant resonance frequency.
  • a material for a DRA must have good radio frequency capability, low dielectric losses and temperature stability. This severely limits the materials that can be used. Suitable materials have ⁇ r values of typically a maximum of 120.
  • Such a DR antenna 1 is shown in FIG. 1 in the basic form considered as an example.
  • other shapes are also possible, such as cylindrical or spherical geometries.
  • Dielectric resonator antennas are resonant components that only work in a narrow band around one of their resonance frequencies (natural frequencies). The problem of antenna miniaturization is equivalent to lowering the working frequency for given antenna dimensions. Therefore the lowest resonance (TE 2 111 mode) is used. This mode has symmetry levels in its electromagnetic fields, one of which is designated symmetry level 2. If the antenna is halved in the plane of symmetry 2 and an electrically conductive surface 3 is attached (for example a metal plate), the resonance frequency remains the same as that of an antenna with the original dimensions.
  • a structure is thus obtained in which the same mode is formed at the same frequency. This is shown in Figure 2.
  • a further miniaturization can be achieved with this antenna by means of a dielectric with a high dielectric constant ⁇ r .
  • a material with low dielectric losses is preferably selected.
  • dielectric resonator antenna Such a dielectric resonator antenna is described in the article "Dielectric Resonator Antennas - A review and general design relations for resonant frequency and bandwidth", Rajesh K. Mongia and Prakash Barthia, Intern. Journal of Microwave and Millimeterwave Computer-aided Engineering, Vol. 4, No. 3, 1994, pages 230-247.
  • a cuboid dielectric resonator antenna is described in particular in FIG. 9 and the associated description.
  • the original structure can be halved without changing the field distribution or other resonance characteristics for the TE z 111 mode (page 244, right column, Lines 1-7).
  • the DRA is excited via a feed line with microwave power by being introduced into the stray field in the vicinity of a microwave line (for example a microstrip line or the end of a coaxial line).
  • EP 0 982 799 A describes a dielectric resonator antenna with an electrical conductive layer disclosed in a plane of symmetry.
  • a dielectric Resonator antenna to create a better coupling to a lead proposed that in the plane of symmetry at least one of the electrically conductive Insulated electrical contact layer is provided, and that the electrical layer and the electrical contact for connecting the dielectric resonator antenna to at least one feed line is provided for a signal to be transmitted or received are.
  • two solid with the dielectric arise in one plane Resonator antenna connected electrical contacts through which the antenna on a Circuit board (PCB) in the known SMD technology (soldering on the surface of the circuit board) can be assembled. This will result in a significantly better coupling of performance into the Antenna reached.
  • PCB Circuit board
  • EP 0982 799 A also describes a transmitter and Receiver with such a dielectric resonator antenna and a mobile radio device with such an antenna.
  • the object of the invention is therefore to create a dielectric resonator antenna, which offers better options for reducing the dimensions.
  • an electrically conductive layer is provided in at least one curved surface in which the tangential component of the electric field of an eigenmode assigned to the dielectric resonator antenna disappears, that a cuboid made of a dielectric material with the side lengths a , b and d is provided in the orthogonal directions x, y and z, and that a curved surface of the shape is provided with the electrically conductive layer, the following applies for the integration parameter C: 0>C> ⁇ .
  • the antenna can be spherical, cuboid or in some other geometric shape be, for example, taking into account manufacturing technology or aesthetic Is selected.
  • the antenna has a discrete spectrum of propagable eigenmodes and natural frequencies, which are determined by solving the Maxwell equations for electromagnetic fields under the given boundary conditions. Therefore, a given DR antenna is always assigned defined eigenmodes. If the lowest mode (TE z 111 mode corresponds to the smallest resonance) is considered, the smallest dimensions for the DRA result.
  • the eigenmodes there are certain distributions of the associated electric field in the antenna, the field vector of which can be divided into a tangential and normal component at each location. According to the invention, such curved surfaces are provided with an electrically conductive layer, which are characterized by a vanishing tangential component of the electric field.
  • the conductive layer receives these conditions for the electric field, and thus also for the associated eigenmode.
  • the electrically conductive layer in the curved surface is preferably obtained by cutting the DRA along the curved surface and applying a metallization (e.g. a silver paste) on the cutting surface. Therefore, the volume of the DRA can be reduced considerably, although the same mode continues to develop at the same frequency. Since there are several curved surfaces identified in this way, a particularly advantageous surface can be selected, for example, according to the desired degree of miniaturization, the required bandwidth of the antenna being produced, and the manufacturing conditions.
  • a rectangular cuboid forms one of the basic shapes for dielectric Resonator antennas are used.
  • This basic form can be used particularly well describe a Cartesian coordinate system whose zero point is advantageous in a corner of the cuboid is chosen so that the edges of the cuboid on the x, y and z axes lie and positive side lengths a, b and d arise. Then they can curved surfaces specified in a particularly simple manner with the above formula become.
  • the curved Surface such a surface is provided, which is formed by means of a parameter C ⁇ 1.
  • a parameter C ⁇ 1 is described because then the task of reducing the dimensions the dielectric resonator antenna is solved particularly well. So that will a significantly greater reduction in the volume of the dielectric resonator antenna achieved than is possible in a curved surface without an electrically conductive layer.
  • the object of the invention is achieved by a transmitter, a receiver and a mobile radio device with such a dielectric resonator antenna in which an electrically conductive layer in at least one curved surface, in which the tangential component of an electric field associated with one of the dielectric resonator antennas Eigenmode disappears, is provided.
  • FIG. 3 shows a dielectric resonator antenna DRA 1 in a basic form with rectangular side faces and side lengths a, b and d in the directions x, y and z of a Cartesian coordinate system.
  • the DRA 1 has a discrete spectrum of natural frequencies, which are determined by the geometric shape and the external dimensions and by the relative dielectric constant ⁇ r of the material used. In order to use the DRA 1 as an antenna for microwave power at a defined frequency, its natural frequency must be close to the defined frequency.
  • the DRA 1 is designed for the center frequency 942.5 MHz of the GSM900 standard as a given frequency.
  • the cuboidal DRA 1 thus has dimensions of approximately a ⁇ b ⁇ 30mm and d ⁇ 5.5mm. Since this dimension seems too large for an integration in devices of mobile communication, the DRA 1 is reduced, as shown in FIGS. 4A and 4B.
  • FIG. 4A shows a cross section through the cuboid DRA 1 in a plane perpendicular to the shortest side length d.
  • the side lengths a and b lie in the x and y directions.
  • a field distribution of an electric field is drawn in, which belongs to the eigenmode with the lowest frequency of the DRA 1.
  • this electrical field distribution clearly shows two planes of symmetry 4 and 5 which are perpendicular to one another and which are marked in cross-section by broken lines.
  • the two planes of symmetry are perpendicular to the plane of the drawing.
  • the reduced DRA 8 shown in FIG. 4B is obtained.
  • the volume of the DRA 1 can be reduced by a factor of 4 to a / 2 * b / while the frequency remains the same.
  • the DRA 8 results with the dimensions 15 * 15 * 5.5 mm 3 . However, these dimensions are still so large that there may be an obstacle to their use, particularly in mobile telephones.
  • FIG. 5 shows the reduced DRA 8 with the metallized side surfaces 6 and 7 in same cross-section shown again.
  • the additional lines drawn are cross-sectional lines of curved surfaces perpendicular to the plane of the drawing the DRA 8.
  • the tangential component of the electrical disappears in these areas Field that according to FIG. 4A to the eigenmode with the lowest frequency DRA 1 or DRA 8 belongs. Any curved surface is covered with another Provide metallization. As a result, the boundary conditions are also in this area kept constant if the upper part of the DRA 8 is subsequently removed. In the remaining one
  • the antenna consequently forms the same eigenmode with the same excitation the same frequency. Since there are a number of areas with this property, the dimensions of the DRA 8 can continue with the same resonance frequency be reduced.
  • a zero point 0 of the Cartesian coordinate system is shown in FIG. 5, so that the curved surfaces can be described mathematically.
  • a / 2 xb / 2 xd a / 2 and b / 2 are the side lengths in the x and y directions (cf. FIGS. 4B and 5).
  • the zero point 0 lies in a corner point of the cuboid DRA 8.
  • the curved surfaces of the vanishing tangential component consequently have that Form ⁇ (x, y (x), z), x ⁇ [0, a / 2], z ⁇ [0, d] ⁇ . Since there are several such curved surfaces, an integration parameter C is included, for which 0 ⁇ C ⁇ gilt applies.
  • the integration parameter C determines the amount h of the remaining DRA.
  • the cut one So part is smaller than a / 2 * b / 2, which was achieved by using the planes of symmetry Size.
  • This method is in principle for every value of C and therefore for any small one h possible, so that there is no fundamental limit to the reduction in dimensions a DRA 1 with a constant resonance frequency.
  • other parameters can how the bandwidth limit the practically applicable degree of miniaturization.
  • the resulting DRA 9 is shown in FIG. 6.
  • the plane of symmetry 10 as can already be seen in FIG. 4B, is also a metallized one curved surface 11. Since the height h can be much smaller than b / 2, the resonance frequency but the same as a rectangular DRA 8 with flat surfaces of dimensions d x a / 2 x b / 2, it becomes a miniaturized DRA 9 with the same Created resonance frequency.
  • FIG. 7 shows in a block diagram the function blocks of a transmit and one Reception path of a mobile radio device with a DRA 9, such as one Mobile phone conforms to the GSM standard.
  • the DRA 9 is equipped with an antenna switch or frequency duplexer 12, which is in a receive or transmit mode connects the receive or transmit path to the DRA 9.
  • reception mode the analog radio signals arrive at an A / D converter via a receiving circuit 13 14.
  • the digital signals generated are demodulated in a demodulator 15 and then fed to a digital signal processor (DSP) 16.
  • DSP 16 digital signal processor
  • the DSP 16 successively the functions equalization, decryption, not shown in detail Channel decoding and speech decoding performed.
  • analog signals are generated which are output via a loudspeaker 18.
  • the analog voice signals recorded by a microphone 19 converted with an A / D converter 20 and then fed to a DSP 21.
  • the DSP 21 performs the speech coding functions which are complementary to the receiving operation, Channel coding and encryption through, all functions of one single DSP.
  • the binary coded data words are in one Modulator 22 GMSK modulated and then in a D / A converter 23 into analog radio signals converted.
  • a transmitter output stage 24 with a power amplifier produces this Radio signal to be transmitted via the DRA 9.
  • the description of the transmission or reception path 9, 13, 14, 15, 16, 17, 18 or 9, 19, 20, 21, 22, 23, 24 corresponds to that of a single transmitter or receiver.
  • the frequency duplexer 12 need not be provided, but use the send and receive path its own DRA 9 as an antenna.
  • Can be used in any other area of radio transmission e.g. for cordless phones according to DECT or CT, for directional or trunked radio devices or pagers).
  • the DRA 9 can be adapted to the transmission frequency.

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Claims (5)

  1. Antenne résonateur diélectrique (9) caractérisée en ce    qu'une couche électriquement conductrice est prévue dans au moins une surface arquée (11) dans laquelle la composante tangentielle du champ électrique d'un mode spécifique affecté à l'antenne résonateur diélectrique (9) disparaít, que, pour la formation de l'antenne résonateur diélectrique (9) il est prévu un parallélépipède en un matériau diélectrique avec les longueurs de côté a, b et d dans les directions orthogonales x, y et z et
       qu'une surface arquée (11) de forme
    Figure 00170001
       est dotée de la couche électriquement conductrice, 0 < C < 8 étant applicable pour le paramètre d'intégration C.
  2. Antenne résonateur diélectrique (9) selon la revendication 1,
        caractérisée en ce    qu'une telle surface qui est formée à l'aide d'un paramètre C < 1 est prévue pour la formation de la surface arquée (11).
  3. Radiotéléphone mobile (9, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24) avec une antenne résonateur diélectrique (9) selon la revendication 1
        caractérisé en ce    que, dans l'antenne résonateur diélectrique (9), il est prévu une couche électriquement conductrice dans au moins une surface arquée (11) dans laquelle disparaít la composante tangentielle d'un champ électrique d'un mode spécifique affecté à l'antenne résonateur diélectrique (9).
  4. Récepteur (9, 19, 20, 21, 22, 23, 24) avec une antenne résonateur diélectrique (9) selon la revendication 1.
  5. Emetteur (9, 13, 14, 15, 16, 17, 18) avec une antenne résonateur diélectrique selon la revendication 1.
EP99204261A 1998-12-18 1999-12-09 Antenne résonateur diélectrique Expired - Lifetime EP1014489B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19858799 1998-12-18
DE19858799A DE19858799A1 (de) 1998-12-18 1998-12-18 Dielektrische Resonatorantenne

Publications (3)

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EP1014489A2 EP1014489A2 (fr) 2000-06-28
EP1014489A3 EP1014489A3 (fr) 2002-01-16
EP1014489B1 true EP1014489B1 (fr) 2003-11-12

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Country Status (7)

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US (1) US6373441B1 (fr)
EP (1) EP1014489B1 (fr)
JP (1) JP2000209019A (fr)
KR (1) KR100710729B1 (fr)
CN (1) CN1126194C (fr)
DE (2) DE19858799A1 (fr)
TW (1) TW456070B (fr)

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US7995001B2 (en) 2003-02-18 2011-08-09 Tadahiro Ohmi Antenna for portable terminal and portable terminal using same
US7710325B2 (en) * 2006-08-15 2010-05-04 Intel Corporation Multi-band dielectric resonator antenna
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EP1014489A3 (fr) 2002-01-16
US6373441B1 (en) 2002-04-16
KR20000048184A (ko) 2000-07-25
DE19858799A1 (de) 2000-06-21
EP1014489A2 (fr) 2000-06-28
KR100710729B1 (ko) 2007-04-24
DE59907706D1 (de) 2003-12-18
CN1126194C (zh) 2003-10-29
JP2000209019A (ja) 2000-07-28
TW456070B (en) 2001-09-21

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