Passive device for increasing the transmission effectiveness of radio-frequency systems

• US 20050020224A1
• Filed: 11/05/2002
• Published: 01/27/2005
• Est. Priority Date: 11/09/2001
• Status: Active Grant

• Current Assignee: Safran Landing Systems
• Original Assignee: Messier-Bugatti (Safran SA)
• Inventors: Thomas, Thierry, Locatelli, Marcel
• Granted Patent: US 7,262,743 B2
• Time in Patent Office: Days
• US Class Current: 455/193.200
• CPC Class Codes: G06K 7/10178 including auxiliary means for focusing, repeating or boosting the electromagnetic interrogation field comparable booster antennas integrated on the record carrier itself G06K19/07794
• CPC Class Codes: H04B 5/73 for taking measurements, e.g. using sensing coils
• CPC Class Codes: Y02D 30/70 in wireless communication networks

Abstract

Radio-frequency transmission device comprising a transmission antenna (2) and a receiving antenna (4), characterised by comprising one or more passive resonant circuits (5) positioned between the transmission and receiving antennae (2, 4).

Claims

1. Radio-frequency transmission device comprising a transmission antenna and a receiving antenna characterised in that it comprises one or more passive resonant circuits positioned between the transmission and receiving antennae.

2. Radio-frequency transmission device of claim 1 characterised in that each passive resonant circuit is tuned to a frequency that is equal or close to a transmission frequency of the transmission antennae.

3. Radio-frequency transmission device of claims 1, characterised in that at least one passive resonant circuit is physically divided into a first and a second part, connected to one another by electrical conductors traversing an electrically conductive wall with two faces, a first and a second, the first part of the passive resonant circuit being located on the side of the first face and the second part of passive resonant circuit being located on the same side as the second face.

4. Radio-frequency transmission device of claims 1, characterised in that the transmission and receiving antennae are separated by one or more conductive walls which have an inside and an outside face defining at least partially a volume, and in that one or more passive resonant circuits are physically divided into a first and a second part, connected to one another by electrical conductors, the first and second parts and the electrical conductor connecting them of each passive resonant circuit in two parts being located entirely on the outside face of one or more of said walls positioned between the transmission and receiving antennae, the first and second part being situated on opposed zones of said outside faces of said walls.

5. Use of a radio-frequency transmission device of claim 3, to make a radio-frequency transmission through a wall between a transmission antennae and a receiving antenna which rotate with respect to one another.

6. Use of a radio-frequency transmission device of claim 4.

7. Conductive enclosure closed off by a wall with an inside face and an outside face characterised in that the enclosure comprises a passive resonant circuit physically divided into a first and a second part connected to one another by electrical conductors, the first and second parts and the electrical conductor connecting them of each passive resonant circuit in two parts being located entirely on the outside face of one or more of said walls positioned between the transmission and receiving antennae the first and second parts being situated on opposed zones of said outside face of said walls.