Asymmetric information transmission system using an electric near field

• US 20060063488A1
• Filed: 09/22/2003
• Published: 03/23/2006
• Est. Priority Date: 10/11/2002
• Status: Abandoned Application

• Current Assignee: Siemens AG
• Original Assignee: Siemens AG
• Inventors: Schindelarz, Georg, Hraby, Gunther, Veith, Peter, Renner, Alexander
• Application Number:
  US10/530,968
• Publication Number:
  US 20060063488A1
• Time in Patent Office: Days
• US Class Current: 455/41.100
• CPC Class Codes: B60C 23/0432 using vehicle structural parts as signal path, e.g. chassis, axle or fender
• CPC Class Codes: B60C 23/0433 Radio signals
• CPC Class Codes: H04B 13/00 Transmission systems characterised by the medium used for transmission, not provided for in groups H04B3/00 - H04B11/00
• CPC Class Codes: H04B 13/02 Transmission systems in which the medium consists of the earth or a large mass of water thereon, e.g. earth telegraphy
• CPC Class Codes: H04B 5/22 Capacitive coupling
• CPC Class Codes: H04B 5/48 Transceivers
• CPC Class Codes: H04B 5/73 for taking measurements, e.g. using sensing coils

Abstract

Disclosed is an information transmission system comprising a transmitter (1) which capacitively and asymmetrically couples an electric near field into an electrical conductor element (6). Said conductor element (6) is made of an essentially homogeneous medium and is provided with an impedance (CB) to the ground, which is used as a return conductor during the transmission of information. A receiver (4) capacitively decouples the electric field and demodulates the transmitted information. The inventive information transmission system can be used in a tire pressure measuring system of a motor vehicle, for example, the conductor element being part of the body of the motor vehicle.

Claims

1-10. -10. (canceled)

11. An information transmission system, comprising:

a transmitter having at least one transmitter coupling element for emitting primarily an electric near field;

an infrastructure body having an electrically conducting conductor element electrically insulated from ground, wherein the electric field is coupled into said conductor element; and

a receiver having a receiver coupling element for coupling out the electric field transmitted in said conductor element.

12. The information transmission system according to claim 11, wherein said conductor element is connected for directly coupling the electric field into said conductor element.

13. The information transmission system according to claim 11, wherein said conductor element is disposed for coupling the electric field into said conductor element by capacitive coupling.

14. The information transmission system according to claim 11, wherein said conductor element is made of a substantially homogeneous material, and an electrical conductivity of said conductor element is time-invariant.

15. The information transmission system according to claim 11, wherein said conductor element has an electrical impedance with respect to ground potential.

16. The information transmission system according to claim 11, wherein said conductor element is an unbalanced conductor element configured to utilize ground potential as a return line for transmission of information.

17. The information transmission system according to claim 11, wherein the electric field is modulated with information to be transmitted.

18. The information transmission system according to claim 17, wherein a carrier frequency lies approximately between 5 MHz and 50 MHz.

21. In a tire pressure measuring system of a motor vehicle, the information transmission system according to claim 11, wherein said conductor element is a part of the bodywork of the motor vehicle and each tire of the motor vehicle has a transmitter, disposed therein, and an associated receiver is disposed on the vehicle in a vicinity of the conductor element.

19. A transmitter for transmitting information, comprising a power supply, a modulator, and a coupling element for coupling information to be transmitted into an electrical conductor element by way of an essentially electric near field.

20. A receiver for receiving information, comprising a power supply, a demodulator, and at least one coupling element for coupling out of a conductor element information transmitted via the electrical conductor element by way of a primarily electric near field.