WO2007112717A1 - Procédé et circuiterie d'excitation d'une antenne émettrice - Google Patents

Procédé et circuiterie d'excitation d'une antenne émettrice Download PDF

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Publication number
WO2007112717A1
WO2007112717A1 PCT/DE2007/000417 DE2007000417W WO2007112717A1 WO 2007112717 A1 WO2007112717 A1 WO 2007112717A1 DE 2007000417 W DE2007000417 W DE 2007000417W WO 2007112717 A1 WO2007112717 A1 WO 2007112717A1
Authority
WO
WIPO (PCT)
Prior art keywords
output signal
inverse
input signal
transmitting antenna
signal
Prior art date
Application number
PCT/DE2007/000417
Other languages
German (de)
English (en)
Inventor
Ulrich Joos
Heinrich Haas
Jochen Zwick
Ulrich Möller
Original Assignee
Conti Temic Microelectronic Gmbh
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 Conti Temic Microelectronic Gmbh filed Critical Conti Temic Microelectronic Gmbh
Priority to DE112007000075T priority Critical patent/DE112007000075A5/de
Publication of WO2007112717A1 publication Critical patent/WO2007112717A1/fr

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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
    • H01Q1/27—Adaptation for use in or on movable bodies
    • H01Q1/32—Adaptation for use in or on road or rail vehicles
    • H01Q1/3208—Adaptation for use in or on road or rail vehicles characterised by the application wherein the antenna is used
    • H01Q1/3233—Adaptation for use in or on road or rail vehicles characterised by the application wherein the antenna is used particular used as part of a sensor or in a security system, e.g. for automotive radar, navigation systems
    • H01Q1/3241—Adaptation for use in or on road or rail vehicles characterised by the application wherein the antenna is used particular used as part of a sensor or in a security system, e.g. for automotive radar, navigation systems particular used in keyless entry systems
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60R—VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
    • B60R25/00—Fittings or systems for preventing or indicating unauthorised use or theft of vehicles
    • B60R25/20—Means to switch the anti-theft system on or off
    • B60R25/24—Means to switch the anti-theft system on or off using electronic identifiers containing a code not memorised by the user
    • B60R25/245—Means to switch the anti-theft system on or off using electronic identifiers containing a code not memorised by the user where the antenna reception area plays a role

Definitions

  • the invention relates to a method / for driving a transmitting antenna according to the preamble of claim .1. Furthermore, the invention relates to a Wegungsa ⁇ extract for carrying out the method according to the invention.
  • Transmitting antennas are used, for example, in keyless identification systems, for example for so-called passive entry systems in motor vehicles. Most long waves are sent for location detection and communication with intelligent identification encoders.
  • FIG. 1 The structure of such a circuit arrangement for controlling a transmitting antenna is sketched in FIG.
  • the input signal is amplified and coupled into the antenna.
  • a transmitting coil is operated in parallel or series resonance.
  • the control is preferably carried out sinusoidally or with a higher harmonic content (for example, rectangular or trapezoidal).
  • Rectangular drive methods have the advantage of low circuit complexity and low power loss in the power output stage.
  • Sinusoidal methods and trapezoidal methods in particular with rounded corners, emit significantly less electromagnetic interference, yet parasitic line capacitances can produce interference that is radiated from the antenna or supply lines.
  • the patent US 2005/0159117 A1 discloses a method or a circuit arrangement for increasing the transmission power of a balanced load, for example a dipole antenna, wherein in addition to the first antenna output signal, another inverse to the first output signal is generated, and a part of the balanced load, for example, the first part of the dipole antenna with the first output signal with supply voltage of V +, and another part of the balanced load namely the second part of the dipole antenna (the bottom dipole part of the dipole-antenna) are supplied with the second output signal with supply voltage of - (V +).
  • the patent AT 113 802 B describes a circuit for tube transmitter to increase the transmission power of a balanced antenna, wherein by grounding the transformer, a symmetrical arrangement is achieved.
  • a circuit arrangement can only be used if the transmission stage is carried out with transformers.
  • the object of the present invention is therefore to provide a method and a circuit arrangement, using this circuit arrangement, the disturbing electromagnetic radiation is reduced in the transmitting antennas.
  • the circuit complexity and power loss should be reduced.
  • An essential idea of the invention is that the transmitter antenna to drive with a substantially trapezoidal input signal.
  • two mutually substantially inverse, ie inverted and largely symmetrical output signals are generated from the trapezoidal input signal, wherein the two preferably amplified output signals essentially receives the shape of the band-limited input signal and fed via the two lines in the transmitting antenna.
  • the band limitation is necessary so that the amplification of the transmission signals can be performed with sufficient accuracy.
  • the proposed method drives the transmit antennas with a signal which keeps the common mode on the antenna lines approximately constant and thus minimizes the disturbing electromagnetic emission due to parasitic couplings.
  • the principle is independent of a driving waveform of the arrangement, as long as the amplifiers have sufficient bandwidth corresponding to gain accuracy.
  • FIG. 2 embodiment of a circuit arrangement according to the invention
  • Figure 3 embodiment of an input signal according to the invention.
  • Figure 1 shows a circuit arrangement according to the prior art in which from a system clock (Clock Input) for the control of the transmitting antenna (ANT) required waveform, for example. A sine or trapezoidal signal is generated.
  • This input signal is amplified by an amplifier to the required transmission power, wherein the output of the amplifier is connected to the one terminal of the antenna, commonly referred to as Hintechnisch, while the other terminal of the antenna, usually designed as a return line, is connected to the ground potential.
  • the signal required for the control of the transmitting antenna is likewise generated from the system clock (clock input) in a signal generator (3).
  • the circuit arrangement (10) essentially comprises two subcircuits, namely two signal amplifier units (101, 102) which, apart from the amplifiers (1.1, 1.2), generate two mutually inverse intermediate signals (d, c2) from the common input signal (e) , preferably identical.
  • the trapezoidal input signal (e) to be driven is supplied in two linear amplifier units (101, 102) with mutually inversely substantially symmetrical linear amplification factors.
  • the amplification factors x1 and x2 can of course also be 1 or -1 different linear amplification factors, as long as the amplification factors correspond in absolute terms as precisely as possible and are inverse to each other from the sign.
  • FIG. 3 shows an inventive substantially trapezoidal input signal compared to a sinusoidal or a rectangular signal.
  • a sinusoidal signal is very well suited for generating broadband-symmetrical Changsignaie.
  • a sinusoidal signal has a relatively small voltage-time area at a given amplitude, which increases power dissipation in the final stage.
  • a rectangular signal on the other hand, has a large voltage-time surface and therefore lower losses in the output stage, but due to the high bandwidth of the signal, extremely fast amplifiers are required for generating broadband-symmetrical output signals, which in turn causes an increase in cost.
  • a very good compromise is a trapezoidal signal, especially if in addition the corners are rounded off. This signal has a much larger voltage-time-area compared to a sinusoidal signal at a constant given amplitude, but has a limited bandwidth, which has a favorable effect on a broadband symmetry of the amplified differential signals.
  • the linear amplifier and likewise linear output stages and their combination parasitic currents in the antenna or supply lines can be largely avoided and so the EMC (Electromagnetic Compatibility) emission can be minimized.
  • EMC Electromagnetic Compatibility
  • symmetrical amplifiers can be realized at a reasonable cost. In this case, there is a favorable ratio of power loss in the final stage and achievable symmetry of the transmission signals.
  • the linear amplifier or the linear amplifier means that the amplification factors of the amplifier or the output stage are linear factors, whereby the output signals have a linear gain relative to the input signal.
  • the DC component on the antenna lines is almost constant and currents in the parasitic coupling capacitances are avoided.
  • the method and the circuit arrangement can be used in principle with different waveforms, in particular, the trapezoidal shape with rounded corners represents a good compromise between the power loss in the power amplifier and the harmonic components.
  • the amplifiers (1.1, 1.2, 2.1, 2.2) are linear amplifiers.
  • the amplification factors (x1, x2, x3, x4) of all amplifiers (1.1, 1.2, 2.1, 2.2) are linear factors, so that the output signals (a1, a2) generated by means of the inventive circuit arrangement (10) have substantially less electromagnetic interference radiation absorbed, caused for example by the parasitic capacitance currents.
  • Such a method or such a circuit arrangement is particularly preferably used in a keyless identification system, as used, for example, as an access system for motor vehicles with so-called passive-entry function.
  • the system has a central unit with at least one, but often spatially distributed on or in the vehicle arranged a plurality of transmission antennas.
  • the driver has an identification transmitter, wherein the central unit via the circuit arrangement according to the invention with two mutually at least substantially symmetrical amplifier units (101, 102) with an inversion for generating two inverse output signals (a1, a2) of the transmitting antenna and of this the identification transmitter energy and / or Data transmitted.

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Security & Cryptography (AREA)
  • Radar, Positioning & Navigation (AREA)
  • Remote Sensing (AREA)
  • Mechanical Engineering (AREA)
  • Transmitters (AREA)
  • Lock And Its Accessories (AREA)

Abstract

L'invention concerne un procédé d'excitation d'une antenne émettrice et une circuiterie permettant la mise en oeuvre dudit procédé ainsi qu'un système d'identification sans clé doté d'une telle circuiterie. Un premier signal de sortie (a1) et un second signal de sortie (a2) sensiblement inversé par rapport au premier signal de sortie (a1) sont produits à partir d'un signal d'entrée (e) sensiblement trapézoïdal. Le premier signal de sortie (a1) et le second signal de sortie inversé (a2) sont acheminés respectivement par l'intermédiaire d'une ligne d'aller (L1) et d'une ligne de retour (L2) de l'antenne émettrice (ANT). Les deux signaux de sortie symétriques et inversés l'un par rapport à l'autre présentent une forme trapézoïdale en fonction de la forme du signal d'entrée. Deux unités d'amplification linéaires (101, 102) inversées l'une par rapport à l'autre et au moins sensiblement symétriques, à facteurs d'amplification linéaires inversés l'un par rapport à l'autre et sensiblement symétriques, sont de préférence utilisées.
PCT/DE2007/000417 2006-04-06 2007-03-08 Procédé et circuiterie d'excitation d'une antenne émettrice WO2007112717A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
DE112007000075T DE112007000075A5 (de) 2006-04-06 2007-03-08 Verfahren sowie Schaltungsanordnung zum Ansteuern einer Sendeantenne

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102006016219.6 2006-04-06
DE200610016219 DE102006016219A1 (de) 2006-04-06 2006-04-06 Verfahren zum Ansteuern einer Sendeantenne sowie Schaltungsanordnung und schlüsselloses Identifikationssystem

Publications (1)

Publication Number Publication Date
WO2007112717A1 true WO2007112717A1 (fr) 2007-10-11

Family

ID=38222107

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/DE2007/000417 WO2007112717A1 (fr) 2006-04-06 2007-03-08 Procédé et circuiterie d'excitation d'une antenne émettrice

Country Status (2)

Country Link
DE (2) DE102006016219A1 (fr)
WO (1) WO2007112717A1 (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102007049564A1 (de) * 2007-10-16 2009-07-30 Continental Automotive Gmbh Passives drahtloses Zugangssystem und Verfahren zum Betreiben eines passiven drahtlosen Zugangssystems
WO2010028652A1 (fr) 2008-09-12 2010-03-18 Nanoko A/S Composition de colostrum
US20110102026A1 (en) * 2009-11-05 2011-05-05 Rohm Co., Ltd. Antenna driving device

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19706792C1 (de) * 1997-02-20 1998-05-14 Siemens Ag Sendeeinheit für ein Diebstahlschutzsystem eines Kraftfahrzeugs und Verfahren zum Betreiben der Sendeeinheit
JPH10154951A (ja) * 1996-11-21 1998-06-09 Maspro Denkoh Corp 送信装置
WO2004097749A1 (fr) * 2003-04-25 2004-11-11 Conti Temic Microelectronic Gmbh Dispositif emetteur d'un systeme d'acces comportant un nombre d'antennes pour ondes longues
EP1538036A1 (fr) * 2003-12-04 2005-06-08 Alps Electric Co., Ltd. Dispositif d'entrée passif sans clé
US20050159117A1 (en) * 2002-01-15 2005-07-21 Igor Bausov Class-L power-output amplifier

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AT113802B (de) * 1925-08-10 1929-07-25 Radio Electr Soc Fr Schaltung für Röhrensender.
DE102004006446B4 (de) * 2004-02-03 2010-06-17 Atmel Automotive Gmbh Verfahren und Schaltungsanordnung zur drahtlosen Datenübertragung

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH10154951A (ja) * 1996-11-21 1998-06-09 Maspro Denkoh Corp 送信装置
DE19706792C1 (de) * 1997-02-20 1998-05-14 Siemens Ag Sendeeinheit für ein Diebstahlschutzsystem eines Kraftfahrzeugs und Verfahren zum Betreiben der Sendeeinheit
US20050159117A1 (en) * 2002-01-15 2005-07-21 Igor Bausov Class-L power-output amplifier
WO2004097749A1 (fr) * 2003-04-25 2004-11-11 Conti Temic Microelectronic Gmbh Dispositif emetteur d'un systeme d'acces comportant un nombre d'antennes pour ondes longues
EP1538036A1 (fr) * 2003-12-04 2005-06-08 Alps Electric Co., Ltd. Dispositif d'entrée passif sans clé

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102007049564A1 (de) * 2007-10-16 2009-07-30 Continental Automotive Gmbh Passives drahtloses Zugangssystem und Verfahren zum Betreiben eines passiven drahtlosen Zugangssystems
DE102007049564B4 (de) * 2007-10-16 2009-11-05 Continental Automotive Gmbh Passives drahtloses Zugangssystem und Verfahren zum Betreiben eines passiven drahtlosen Zugangssystems
WO2010028652A1 (fr) 2008-09-12 2010-03-18 Nanoko A/S Composition de colostrum
US8637075B2 (en) 2008-09-12 2014-01-28 Pharma Gp Aps Colostrum composition
US20110102026A1 (en) * 2009-11-05 2011-05-05 Rohm Co., Ltd. Antenna driving device
US8339164B2 (en) * 2009-11-05 2012-12-25 Rohm Co., Ltd. Antenna driving device

Also Published As

Publication number Publication date
DE112007000075A5 (de) 2008-08-28
DE102006016219A1 (de) 2007-10-11

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