Communication terminal
AssigneeSkidata AG
InventorWolfgang Grabner
Life of this patent
Estimating the term…
Abstract
A terminal designed for communication with contactless-type data carriers with two different carrier frequencies has two resonant circuits (I, II) for one and the other carrier frequency. Both resonant circuits (I, II) work with one and the same antenna (A) and one capacitor (C1, C3) in each case. In the resonant circuit (II) for low carrier frequency a coupling inductance coil (L) is provided between the capacitor (C3) and the antenna (A).
Claims18
A terminal for connection to a contactless data carrier having first transceiver electronics that exchanges signals over a first frequency carrier signal and second transceiver electronics that exchanges signals over a second frequency carrier signal, the first and second carrier frequencies being different frequencies, said terminal including:
- a single antenna;
- a first resonant circuit for connection to the first transceiver electronics, said first resonant circuit comprising:
- said antenna;
- a first contact point for connecting said antenna to the first transceiver electronics;
- a first capacitor connected at one end to a junction between said antenna and said first contact point and at a second end to ground;
- and
- a second resonant circuit for connection to the second transceiver electronics, said second resonant circuit comprising:
- said antenna;
- an inductor in series between said antenna and said second transceiver electronics;
- and a second capacitor connected at one end to a junction between said inductor and said second transceiver electronics and, at a second end, to ground.
A method of communicating with a contactless data carrier:
- communicating with the data carrier with first transceiver electronics that operates at a first carrier frequency;
- communicating with the data carrier with second transceiver electronics that operates at a second carrier frequency, the second carrier frequency being different from the first carrier frequency;
- and
- exchanging signals with the first transceiver electronics and the second transceiver electronics through a single terminal, the terminal comprising:
- a single antenna;
- a first resonant circuit connected to the first transceiver electronics, the first resonant circuit comprising:
- the antenna;
- an inductor in series between the antenna and the first transceiver electronics;
- and a first capacitor connected at one end to a junction between the inductor and the first transceiver electronics and, at a second end, to ground;
- and
- a second resonant circuit connected to the second transceiver electronics, the second resonant circuit comprising:
- the antenna;
- a connection between the antenna and the second transceiver electronics;
- and a second capacitor connected at one end to the connection between the antenna and the second transceiver electronics and, at a second end, to ground.
Dependencies are inferred from the claim text.