Communication terminal

• US 20030179108A1
• Filed: 02/27/2003
• Published: 09/25/2003
• Est. Priority Date: 08/31/2000
• Status: Active Grant

• Current Assignee: SKIDATA AG (Thales SA)
• Original Assignee: SKIDATA AG (Thales SA)
• Inventors: Grabner, Wolfgang
• Granted Patent: US 6,911,876 B2
• Time in Patent Office: Days
• US Class Current: 340/933
• CPC Class Codes: G06K 7/0008 General problems related to the reading of electronic memory record carriers, independent of its reading method, e.g. power transfer
• CPC Class Codes: G06K 7/10346 the antenna being of the far field type, e.g. HF types or dipoles

Abstract

The invention relates to a terminal for communication with data supports which function in a non-contact manner, comprising a transceiver circuit with two resonant circuits with antenna and condenser for the emitting of two radio frequency fields of different carrier frequencies, whereby the common antenna (A) for both resonant circuits comprises a winding.

Claims

1. A terminal for communication with contactless-type data carriers having transceiving electronics with two resonant circuits with antenna and capacitor for radiating two radiofrequency fields with different carrier frequency, characterized in that the common antenna (A) for both resonant circuits has one turn.

2. A terminal according to claim 1, characterized in that the antenna (A) is formed as a coaxial cable with an inner conductor cross section of 1 to 5 millimeters, the antenna shield (ASH) being interrupted in the middle area.

3. A terminal according to any of the above claims, characterized in that the transceiving electronics has an auxiliary coil (L) disposed so as to be connected in series with the antenna (A) for the low-frequency resonant circuit while being connected in parallel for the high-frequency resonant circuit.

4. A terminal according to any of the above claims, characterized in that the auxiliary coil (L) is replaced with a switch (S).

5. A terminal according to claim 4, characterized in that the switch (S) is formed as an electromechanical relay, a pin diode, a field-effect transistor (FET), a wave trap, an inductance or a semiconductor relay.