EP0777292A1 - Unité d'antenne - Google Patents

Unité d'antenne Download PDF

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Publication number
EP0777292A1
EP0777292A1 EP96117893A EP96117893A EP0777292A1 EP 0777292 A1 EP0777292 A1 EP 0777292A1 EP 96117893 A EP96117893 A EP 96117893A EP 96117893 A EP96117893 A EP 96117893A EP 0777292 A1 EP0777292 A1 EP 0777292A1
Authority
EP
European Patent Office
Prior art keywords
antenna unit
antenna
unit according
arms
printed
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.)
Granted
Application number
EP96117893A
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German (de)
English (en)
Other versions
EP0777292B1 (fr
Inventor
Horst Ziegler
Horst Behlen
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.)
Individual
Original Assignee
Individual
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 Individual filed Critical Individual
Priority to SI9630011T priority Critical patent/SI0777292T1/xx
Publication of EP0777292A1 publication Critical patent/EP0777292A1/fr
Application granted granted Critical
Publication of EP0777292B1 publication Critical patent/EP0777292B1/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
    • 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
    • H01Q1/2208—Supports; Mounting means by structural association with other equipment or articles associated with components used in interrogation type services, i.e. in systems for information exchange between an interrogator/reader and a tag/transponder, e.g. in Radio Frequency Identification [RFID] systems
    • H01Q1/2233—Supports; Mounting means by structural association with other equipment or articles associated with components used in interrogation type services, i.e. in systems for information exchange between an interrogator/reader and a tag/transponder, e.g. in Radio Frequency Identification [RFID] systems used in consumption-meter devices, e.g. electricity, gas or water meters
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q7/00—Loop antennas with a substantially uniform current distribution around the loop and having a directional radiation pattern in a plane perpendicular to the plane of the loop

Definitions

  • the invention relates to an antenna unit, in particular for use in the wireless remote reading of consumption meters, according to the preamble of claim 1.
  • the antenna unit comprises a single curved antenna arm, which is connected at one end to the power stage of a UHF transmission circuit.
  • the present invention is intended to improve an antenna unit in accordance with the preamble of claim 1 in such a way that its working behavior reacts less sensitively to obstacles located in its vicinity.
  • the invention makes use of the fact that most of the obstacles in households in the vicinity of consumption meters differ from case to case and also the other obstacles in the vicinity of Obstacles encountered by transmitting and / or receiving antennas represent dielectrics. These have a stronger influence on the working behavior of such an antenna, which has a predominantly electrical alternating field in the immediate vicinity of the antenna.
  • the antenna unit according to the invention generates an electromagnetic alternating field with a predominantly magnetic component in its immediate vicinity, and for this reason the working behavior of the antenna unit according to the invention is only slightly impaired by the obstacles usually found in the vicinity of consumption meters or other devices containing an antenna unit.
  • the antenna unit according to the invention also works well in the vicinity of large metal surfaces, as are often found in the immediate vicinity of consumption meters (meter housings for gas / electricity meters, radiators and water pipes in the vicinity of heat meters).
  • An antenna unit according to the invention can also be built significantly less than a quarter of the wavelength of the frequency bands used for data transmission (200 to 1,000 MHz, predominantly 433.92 MHz in Europe), although it still has a good radiation efficiency, which enables the power consumption of the wirelessly readable consumption meter can be kept small.
  • the latter is advantageous in view of the fact that the multi-year batteries used to operate the consumption meter should suffice for the entire calibration period, that is to say approximately five to twelve years.
  • An antenna unit according to the invention can advantageously also be used in a receiver, for example in a central registration unit that works with consumption meters that can be read by radio.
  • its high quality ensures strong suppression of third-party transmitters without amplifier overdrive and good suppression of harmonics caused by nonlinearities of the transmitter, without the need for special filter measures.
  • an antenna unit according to the invention is also well suited as a transmit / receive antenna in bidirectional data transmission applications.
  • an inductive coupling to a UHF transmitter circuit is obtained.
  • the antenna unit is separated from the transmitter / receiver in terms of direct current (avoidance of potential and safety problems), and you can also adjust the impedance of the connected transmitter / receiver at the same time by appropriate measurement of the feed inductance, because typical radiation resistances of antennas of interest here are in the Range from 30 to 200 mOhm, the typical impedances of transmitters and receivers in the range of 50 Ohm.
  • phase angle between the current in the feed inductance and the current in the antenna arms allows the phase angle between the current in the feed inductance and the current in the antenna arms to be set to a desired phase angle, in particular the phase angle 0.
  • the development of the invention also serves to optimize the adaptation of the antenna unit and transmitter or receiver and to compensate for manufacturing tolerances.
  • An antenna unit as specified in claim 5, can be produced very easily from pipe material with good electrical conductivity by cutting and slitting individual rings.
  • the development of the invention according to claim 6 is advantageous with regard to the best possible guidance of the field lines in the gap between the ends of the antenna arms and with regard to the low ohmic resistance of the antenna unit. Keeping the field lines together is advantageous in terms of keeping back effects of obstacles on the working behavior of the antenna unit. Low ohmic losses are desirable for reasons of long durability of the operating battery of the consumption meter: for antenna units according to the invention these can be a few mOhms or fractions thereof, that is to say they are much smaller than the radiation resistance of typically 30 to 200 mOhms.
  • the antenna units according to the invention therefore have a high circular quality of 100 to 1000. The latter is also advantageous with regard to the suppression of harmonics and harmonics generated by a non-linear transmission circuit by the antenna unit.
  • the development of the invention according to claim 7 allows a very simple manufacture of the antenna arms using the known and inexpensive technology of printed conductor tracks.
  • the thickness of printed conductor tracks produced using conventional techniques is sufficient with regard to the antenna effect, since the field at the frequencies in question here between 200 to 1,000 MHz in practice in Germany of 433.92 MHz only penetrates a few microns into the conductor track.
  • Appropriate dimensioning of the width of the conductor track results in a sufficiently small resistance of the antenna arms in the range of a few mOhm.
  • the radiation behavior of the antenna unit can be specified in a very simple manner via the geometry of the conductor track. Typically, clear dimensions of the antenna arm conductor track in the range of 50 x 50 mm are sufficient for radio remote reading of consumption meters.
  • a further advantage of the design of the antenna unit according to claim 7 is that additional electronic components which belong to the UHF transmitter or for coupling the antenna unit to the UHF transmitter (or receiver) are arranged and interconnected on the circuit board carrying the conductor track ) belong.
  • the floating coupling and impedance adaptation of the antenna arms to the transmitter or receiver can also be realized in a simple manner, the assignment geometry between the feed inductance and antenna arms being fixed, so that no assembly errors can occur here.
  • connection capacitor according to claim 13 can be attached in a particularly simple manner and without additional assembly work and without drilling the circuit board, while the variant according to claim 14 is advantageous with regard to a particularly economical use of the relatively expensive capacitor dielectric.
  • the connection capacitor specified in more detail in claim 12 can be attached in a simple manner similar to surface-mounted components.
  • the development of the invention according to claim 15 allows the capacitance of the connecting capacitor to be set simply on the finished antenna unit, e.g., via the position of the interruptions in the conductor track forming a capacitor plate. by mechanically scratching or interrupting the conductor track using a laser.
  • An antenna unit as specified in claim 16 is well suited in connection with devices such as e.g. Consumption meters that have a cylindrical housing, e.g. Water meters and the like, and can even form a peripheral wall of the housing of the device.
  • devices such as e.g. Consumption meters that have a cylindrical housing, e.g. Water meters and the like, and can even form a peripheral wall of the housing of the device.
  • the transmission capability is particularly good or reception capacity of the presence or absence of extensive metallic objects in the vicinity of the antenna unit.
  • the metallic shielding plate provided in accordance with claim 18 creates defined field conditions in the half space behind the antenna arms, which are then no longer significantly modified by the presence of further obstacles; the properties of the shielding plate can be taken into account when designing the antenna unit.
  • a temperature sensor 10 is thermally coupled to a heat consumer, for example a radiator.
  • the output signal of the temperature sensor 10 is fed via an analog / digital converter 12 to the one input of a digital multiplier circuit 14.
  • the second input of the multiplier circuit 14 receives the output signal of a read-only memory 16, which is connected via a socket 18 to one for the heat output of the radiator can be described as a characteristic number.
  • the second input of the multiplication circuit 14 can be connected to the output of a flow meter 20, as indicated by dashed lines.
  • the output signal of the multiplier circuit 14 reaches an integrating circuit 22.
  • the latter assembles the current meter reading with character strings stored in a read-only memory 28, which contain the identification of the measuring point and characteristic quantities of the heat consumption meter.
  • the composite character string, which, as said, contains the current counter reading, is transferred to a parallel / serial converter 30.
  • the character string obtained at its output controls a modulator 32 whose operating frequency corresponds to the baud rate clock (in practice 300-19200 baud).
  • the output signal of the modulator 32 controls the modulation (AM or FM) of a UHF transmission circuit 34, the basic working frequency of which is chosen in the range between 200 and 1000 MHz, in Europe generally at 433.92 MHz.
  • Its output is connected to the one terminal of an antenna unit, designated 36 in total.
  • the second connection terminal of the antenna unit 36 is connected to the ground line of the transmission circuit 34, indicated at 38.
  • the antenna unit 36 comprises a feed inductor 40 and preferably a series inductor connected to it adjustable capacitance 42.
  • the LC circuit thus formed connects the two connection terminals of the antenna unit 36.
  • the center of two arm inductors 44, 45 connected in series can also be connected to the connection of the antenna unit 36, as indicated by dashed lines; however, the arm inductors are preferably kept potential-free in terms of DC voltage.
  • ring should be understood to mean any self-contained geometric structure, not just circular rings. Ring therefore also contains closed polygons such as rectangles. It is important for the present invention that the antenna arm ring is not completely closed, rather there is an interruption at a point opposite the center point of the connecting line between the arm inductors 44, which is bridged by a terminating capacitance 46.
  • the antenna unit 36 works as a compact inductive antenna, the dimensions of which are considerably smaller than the wavelength of the emitted electromagnetic waves (this is approximately 70 cm at 433 MHz). In practice, antenna units whose dimensions are in the range of one twentieth of the wavelength or less can be realized with good efficiency (20 to 70%) according to the present invention. Details of practical embodiments of the antenna unit 36 are further described with reference to FIGS. 2 to 9.
  • the consumption meter according to FIG. 1 only transmits during selected very short periods of time within a day in order to maintain the load on the batteries required for operating the logic components and power components, which are indicated schematically at 48 and 50, over the calibration period of the consumption meter, which in practice is functional over five to twelve Means years.
  • a statistically operating broadcasting time generator 52 determines a few, e.g. four transmission windows, the duration of which can be approximately 10 ms in practice. Details of such a transmission time generator are described in DE 42 25 042 A1, to which reference is made in full in this regard.
  • the transmission time generator 52 first activates the character chain, and after a short period of time which is sufficient for the composition of the counter reading and the content of the read-only memory 28, this first signal provided on a control line 54 is ended.
  • the converter 30, the modulator 32 and the transmission circuit 34 are then activated by an activation signal emitted on a second control line 56 for the time required to transmit the entire character string (typically 10 ms).
  • FIG. 2 shows a first practical exemplary embodiment for an antenna unit 36.
  • a copper sleeve 60 is arranged on a printed circuit board and has a narrow, continuous slot 62 at the point at the top in the drawing. In practice, this has a width of fractions of a millimeter, e.g. 0.2 mm.
  • An insulating piece 64 made of a material is inserted into the slot 62, which has a high dielectric constant with a low dielectric loss factor and a low temperature response of its dielectric properties. In practice, the insulating piece can consist, for example, of a thin insulating glass pane.
  • the copper sleeve 60 can have a diameter of 30 mm, a thickness of 3 mm and an axial dimension of 7 mm.
  • Such a copper sleeve can be produced simply by cutting a corresponding copper tube to length.
  • the slot 62 can be made in the copper tube before being cut to length or in the copper sleeve after being cut to length.
  • the insulating piece 64 made of glass is press-fitted between the walls of the slot 62.
  • the walls of the slot 62 form the plates, the insulating piece 64 the dielectric of the termination capacitance 46, which bridges the free ends of two antenna arms 66, 68, the antenna arms 66, 68 being formed by the two halves of the copper sleeve 60 which are on either side of the ring diameter passing through the slot 62.
  • planar conductor track 72 which is provided on the back of the circuit board 58 and can, but need not, be grounded.
  • Two kinked shield conductor paths 74, 76 and a shield conductor path 78 lying on the center line of the antenna unit extend symmetrically on both sides of the ring center line.
  • a printed capacitor plate 80 is provided in the area of the printed circuit board 58 at the bottom left in FIG. 2 on the rear side in FIG. 2.
  • a further capacitor plate 82 is located above this, separated by the circuit board 58.
  • the two printed capacitor plates 80, 82 together with the section of the circuit board 58 lying between them form the capacitance 42 as a dielectric.
  • the printed capacitor plate 80 is connected to one end of a strip-shaped conductor track 84, the second end of which is connected to the ground conductor track 72. In this way, the conductor track 84 forms the feed inductance 40.
  • connection of the antenna unit 36 according to FIG. 2 to the transmission circuit 34 is thus made on the capacitor plate 82 and the ground conductor 72.
  • an enlarged head section 86 is provided at the end of the shield conductor track 78, which still covers the ends of the antenna arms 66, 68.
  • a further printed circuit board 88 is arranged above the copper sleeve 60 and has the same geometry as the printed circuit board 58, but the capacitor plate 82 of this printed circuit board remains unconnected.
  • the change in the antenna characteristic due to an object placed at a distance of 10 cm is only less than 15%.
  • a printed circuit board 94 consists of a material which has a high dielectric constant and low dielectric losses.
  • a sheet material is e.g. a glass fiber fabric, which is embedded in a corresponding dielectric properties synthetic resin matrix.
  • Such special circuit board materials are commercially available.
  • the arm inductors 44 are formed by a printed conductor track 96 having a rectangular contour, which follows the edge of the printed circuit board 94 at a small distance and has an interruption 98 in its upper horizontal track section.
  • the center of the lower horizontal conductor track section is connected to a ground connection 100.
  • the conductor track 96 specifies two C-shaped antenna arms 102, 104.
  • a printed strip-shaped capacitor plate 106 is provided on the back of the printed circuit board 94, which is aligned with the upper free legs of the antenna arms 102, 104.
  • the capacitor plate 106 thus forms together with the end portions of the antenna arms 102, 104 and the intermediate portion of the circuit board 94 the terminating capacitance 46 as dielectric.
  • the size of the termination capacitance 46 can be adjusted by making 106 breaks 108 in the capacitor plate, e.g. B by mechanical scribing or local evaporation using a laser.
  • the termination capacitance 46 is preferably tuned in such a way that the symmetry of the termination capacitance 46 with respect to the center line of the antenna unit 36 is maintained.
  • a loop-shaped conductor track 110 which forms the feed inductance 40, is also provided on the rear side of the printed circuit board 94.
  • the two connecting lugs of the conductor track 110 are interrupted and bridged by a capacitor 112 attached in the surface mounting or a trimming resistor 114 attached by surface mounting.
  • the capacitor 112 corresponds to the capacitance designated 42 in FIG.
  • an antenna unit 36 as shown in FIGS. 3 and 4, can be inexpensively manufactured in large quantities.
  • the size relationship between the conductor 96 and the conductor 110 makes it easy to specify the transmission ratio of the transformer formed by these two conductor tracks, so that the impedance matching of the arm inductances 44 formed by the conductor tracks 96 to the output resistance of the transmitting circuit 34.
  • the printed circuit board 94 is made of normal printed circuit board material manufactured.
  • a special flat terminating capacitor 116 is soldered onto the top of the free end sections of the antenna arms 102, 104 and is likewise produced using printed circuit board technology.
  • the terminating capacitor 116 comprises a substrate plate 118 which is made of a material with a high dielectric constant, a low dielectric loss factor and a high temperature constancy of the aforementioned dielectric properties.
  • a material with a high dielectric constant, a low dielectric loss factor and a high temperature constancy of the aforementioned dielectric properties is available under the type designation RO3000 from Rogers Corp. to acquire.
  • the substrate plate 118 carries on its upper side a capacitor plate 120, the edge of which is spaced on all sides from the edge of the substrate plate 118, in order to prevent unintentional contact with the capacitor plate 120 when the terminating capacitor 116 is soldered onto the antenna arms 102, 104 due to excess solder.
  • the substrate plate 118 is provided with two printed capacitor plate segments 122, 124, the free space 126 lying between them being at least as large as the interruption 98, so that the magnetic properties of the arm inductors are still determined by the geometry of the antenna arms 102, 104 is specified.
  • the capacitor plate segments 122, 124 can also be continued closer to one another, so that the free space 126 then also simultaneously specifies the effective distance between the ends of the antenna arms 102, 104.
  • the terminating capacitor 116 can also be soldered somewhat asymmetrically onto the ends of the antenna arms 102, 104, so that the electrically effective distance between the antenna arms 102, 104 is predetermined by one of the arm ends and one of the capacitor plate segments.
  • interruptions 128 can again (preferably symmetrically) e.g. generate by laser cutting.
  • the embodiment of the antenna unit 36 according to FIGS. 5 and 6 has the advantage that with a still compact structure and using circuit board technology, a terminating capacitance is obtained, but according to FIGS. 5 and 6 only a small amount of the expensive material with good dielectric properties is required becomes.
  • a low-loss conventional terminating capacitor 130 is connected to the ends of the antenna arms 102, 104, which e.g. can be a metal paper capacitor.
  • FIG. 8 shows a sleeve-shaped antenna unit which comes close to the basic idea of the structure of the antenna unit according to FIGS. 3 and 4.
  • An outer conductor track 134 with an interruption 136 and an inner conductor track 138 are applied to a circuit board sleeve 132, which consists of a material with the good dielectric properties already mentioned above.
  • the conductor 134 is connected to a ground line at the end opposite the interruption 136 and again provides antenna arms 140, 142, while the internal conductor path 138 together with the antenna arms 140, 142 forms a termination capacitance, the circumferential extent of which is determined by interruptions 144, the position of which is selected as required.
  • FIG. 9 The exemplary embodiment shown in FIG. 9 for a sleeve-shaped antenna unit is obtained from the exemplary embodiment according to FIG. 8 by omitting the internal conductor path 138 and by soldering a terminating capacitor 116 over the ends of the antenna arms 140, 142, as described above with reference to FIG. 6 has been described in detail.
  • the conductor track 134 and the terminating capacitor 116 can also be provided on the inside of the circuit board sleeve 132, so that the outside of the latter is free of electrical elements.
  • Such an antenna unit can then also take over the mechanical of a peripheral wall of a cylindrical housing, e.g. a water clock.
  • a printed feed inductance can also be provided on the printed circuit board sleeve, as described above for flat printed circuit boards with reference to FIGS. 3 and 4.
  • Figure 10 shows a radio-readable consumption meter with remotely adjustable working characteristics, e.g. an electricity meter with switchable tariffs.
  • a sensor 146 sends a counting signal corresponding to the power currently consumed by the consumer to a consumption cost calculation circuit 148.
  • the count signal can be, for example, a pulse sequence which is obtained by reading out marks which are provided on the eddy current measuring disc of the power meter.
  • the computing circuit works e.g. so that for each count pulse received it multiplies a number stored in a read-only memory 150, which indicates the current elementary consumption corresponding to a count pulse (characteristic calibration variable of the digital sensor 146), by a cost signal associated with the price of the elementary consumption, which it receives on a line 152 is transferred.
  • the product signal thus obtained is added to the content of a cost storage 154.
  • the cost signal contained in this is transmitted wirelessly at stochastic intervals to a central billing unit, similar to that already described above with reference to FIG. 1.
  • the signal conversion which is not shown in detail in FIG. 10, is carried out by a conversion circuit 156, which controls a UHF transmission circuit 158, which is connected via a transmission / reception switch 160 to an antenna unit 36 which is similar to that according to FIGS. 3 and 4 .
  • the conductor track 110 is designed similar to a rung ladder and has crossbars 162, 164 and crossbars 166 connecting them.
  • the latter can be provided with prepared interruption points 168, in a modification instead or additionally the crossbars.
  • the effective area of the feed inductance corresponds to the averaged rung position. In the illustrated embodiment, only the uppermost of the rung tracks is interrupted, so that the effective area of the feed inductance corresponds to that which would be obtained with a rung track which lies between the middle and the lower rung tracks.
  • a receive output of the transmit / receive switch 160 is connected to the input of a demodulator 170.
  • the bit stream emitted by this is returned by a converter 172 in parallel format.
  • the digital signal thus obtained which in the present case corresponds to the tariff currently valid (price per elementary consumption), is provided on line 152.
  • the tariff that is currently valid and the accumulated consumption costs are communicated to the user on a display 174.
  • the meter readings from the various consumption memories are then sent to the central meter reading and billing system Settlement unit transmitted.
  • a consumption meter read out by radio and controlled by radio enables a very variable consumption billing even using a larger number of tariffs.

Landscapes

  • Arrangements For Transmission Of Measured Signals (AREA)
  • Support Of Aerials (AREA)
  • Details Of Aerials (AREA)
  • Variable-Direction Aerials And Aerial Arrays (AREA)
  • Burglar Alarm Systems (AREA)
  • Waveguide Aerials (AREA)
  • Measuring Temperature Or Quantity Of Heat (AREA)
  • Structure Of Receivers (AREA)
EP96117893A 1995-12-06 1996-11-08 Unité d'antenne Expired - Lifetime EP0777292B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
SI9630011T SI0777292T1 (en) 1995-12-06 1996-11-08 Antenna unit

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19545394A DE19545394A1 (de) 1995-12-06 1995-12-06 Antenneneinheit
DE19545394 1995-12-06

Publications (2)

Publication Number Publication Date
EP0777292A1 true EP0777292A1 (fr) 1997-06-04
EP0777292B1 EP0777292B1 (fr) 1998-06-10

Family

ID=7779266

Family Applications (1)

Application Number Title Priority Date Filing Date
EP96117893A Expired - Lifetime EP0777292B1 (fr) 1995-12-06 1996-11-08 Unité d'antenne

Country Status (10)

Country Link
EP (1) EP0777292B1 (fr)
AT (1) ATE167333T1 (fr)
CZ (1) CZ288642B6 (fr)
DE (2) DE19545394A1 (fr)
DK (1) DK0777292T3 (fr)
ES (1) ES2119540T3 (fr)
HU (1) HU221219B1 (fr)
PL (1) PL181957B1 (fr)
SI (1) SI0777292T1 (fr)
SK (1) SK155396A3 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1032075A2 (fr) * 1999-02-26 2000-08-30 Berg Electronics Manufacturing B.V. Connecteur électrique pour antennes à boucles

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19954579C5 (de) * 1999-11-12 2008-09-11 Techem Energy Services Gmbh Vorrichtung zur Erfassung des Energieverbrauchs einer Heizungsanlage
DE10004222A1 (de) * 2000-02-01 2001-06-21 Lear Automotive Electronics Gm Funk-Fernbedienungsgeber
DE10010936B4 (de) * 2000-03-06 2006-11-02 Horst Prof. Dr. Ziegler Antenne
DE102009000692A1 (de) 2009-02-06 2010-08-12 Wika Alexander Wiegand Gmbh & Co. Kg Messgerät

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3852758A (en) * 1973-03-12 1974-12-03 J Polson Coupling method and device for animal mountable electronic package
US4661821A (en) * 1985-03-15 1987-04-28 General Electric Company Vandalism-resistant UHF antenna
EP0312792A1 (fr) * 1987-09-25 1989-04-26 Alcatel Radiotelephone Antenne pour récepteur miniature notamment pour récepteur en forme de boitier de montre
EP0344885A2 (fr) * 1988-05-11 1989-12-06 Amtech Systems Corporation Antenne réfléchissante
DE4225042A1 (de) 1992-07-29 1994-02-03 Ziegler Horst Verfahren zum Übertragen von Meßdaten
EP0619620A2 (fr) 1993-04-08 1994-10-12 KUNDO SYSTEMTECHNIK GmbH Dispositif pour déterminer la consommation, en particulier dispositif pour déterminer des frais de chauffage ou d'eau chaude

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4847626A (en) * 1987-07-01 1989-07-11 Motorola, Inc. Microstrip balun-antenna
US4972198A (en) * 1987-08-31 1990-11-20 Monarch Marking Systems, Inc. Multiple loop antenna
DE8814993U1 (de) * 1988-01-04 1989-03-02 Oppermann, Richard, 7762 Ludwigshafen Antenneneinheit, bestehend aus Antennenschleife, Kondensator und Ankopplung
JPH04321190A (ja) * 1991-04-22 1992-11-11 Mitsubishi Electric Corp 非接触型携帯記憶装置のアンテナ回路

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3852758A (en) * 1973-03-12 1974-12-03 J Polson Coupling method and device for animal mountable electronic package
US4661821A (en) * 1985-03-15 1987-04-28 General Electric Company Vandalism-resistant UHF antenna
EP0312792A1 (fr) * 1987-09-25 1989-04-26 Alcatel Radiotelephone Antenne pour récepteur miniature notamment pour récepteur en forme de boitier de montre
EP0344885A2 (fr) * 1988-05-11 1989-12-06 Amtech Systems Corporation Antenne réfléchissante
DE4225042A1 (de) 1992-07-29 1994-02-03 Ziegler Horst Verfahren zum Übertragen von Meßdaten
EP0619620A2 (fr) 1993-04-08 1994-10-12 KUNDO SYSTEMTECHNIK GmbH Dispositif pour déterminer la consommation, en particulier dispositif pour déterminer des frais de chauffage ou d'eau chaude

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1032075A2 (fr) * 1999-02-26 2000-08-30 Berg Electronics Manufacturing B.V. Connecteur électrique pour antennes à boucles
EP1032075A3 (fr) * 1999-02-26 2003-01-08 Berg Electronics Manufacturing B.V. Connecteur électrique pour antennes à boucles

Also Published As

Publication number Publication date
DE59600272D1 (de) 1998-07-16
ES2119540T3 (es) 1998-10-01
SK155396A3 (en) 1997-10-08
DK0777292T3 (da) 1999-03-29
EP0777292B1 (fr) 1998-06-10
SI0777292T1 (en) 1999-02-28
CZ288642B6 (cs) 2001-08-15
HU221219B1 (en) 2002-08-28
CZ357396A3 (en) 1997-06-11
PL317306A1 (en) 1997-06-09
HU9603314D0 (en) 1997-01-28
HUP9603314A2 (en) 1997-11-28
ATE167333T1 (de) 1998-06-15
HUP9603314A3 (en) 1998-03-02
DE19545394A1 (de) 1997-06-12
PL181957B1 (pl) 2001-10-31

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