| 摘要 |
For a device for the optimum connection of a transmitter and a receiver to an inductive coupling element (induction loop, frame antenna, ferrite antenna) which is fixed or located on a vehicle, the object is to prevent the transmission and reception branches from interfering with one another. To achieve this, a first bandpass filter (SB) for the transmission frequency f1, comprising a series circuit made up of a low-loss coil (L1) and a capacitor (C1) and a following parallel circuit at zero potential on one side comprising a capacitor (C2) and a low-loss coil (L2), is connected downstream of the transmitter (S), the output of which passes via a terminal resistor (Ra) to the first connection of the coupling element (K); the second connection of the coupling element passes to a series circuit comprising an adjustable low-loss coil (L3) and a capacitor (C31) with which an adjustable capacitor (C32) is connected in parallel; the output of the series circuit passes via a second bandpass filter (EB) tuned to the reception frequency f2 to the receiver (E), the second bandpass filter (EB) comprising a parallel circuit at zero potential on one side being made up of a capacitor (C4) and a low-loss coil (L4), and a series circuit located between the connection point of this parallel circuit and the receiver, which series circuit is made up of a capacitor (C5) and a low-loss coil (L5), and ... Original abstract incomplete. <IMAGE>
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