Electronic Circuit for a High-Frequency Switch

An electronic circuit for a high-frequency switch for opening an antenna resonance circuit of an RFID system, wherein the high-frequency switch, which is composed of at least two PIN diodes, can be opened and closed by d.c. voltages, comprises:

• a rectifier circuit, which is disposed outside the antenna resonance circuit, generates the blocking voltage for opening the high-frequency switch from the high-frequency supply voltage, the tapping operation, which takes place via at least one connecting line (b), being decoupled with respect to direct current from the rectifier circuit, and
• the rectifier circuit is designed such that it generates a blocking voltage whose value corresponds at least to the peak-to-peak value of the high-frequency voltage to be switched, and
• the blocking voltage is conducted via the same electric connecting line (a) via which the high-frequency supply voltage and a closing voltage are also conducted to the antenna of the RFID system, injection of the blocking voltage taking place with an high impedance, and
• resistors are connected in parallel with the respective PIN diodes which are series-connected with respect to direct current.