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Sensor applications for RFID systems received a lot of attention in the last years. Here a compact planar patch antenna that provides space for sensor elements and their connection network is presented. The proposed antenna is built up from a standard patch antenna, shortened by through-holes at two edges and has an opening in the patch metallization for placing sensor components. Placed on a metal...
A main task in RFID chip design is the determination of its input impedance. Standard methods involving the use of a state-of-the-art network analyzer require expensive equipment. Here a new approach is proposed to determine the impedance by measuring the voltage output of the rectifier stage of an 868 MHz RFID tag. The tag is connected to several antennas with different impedances and for each the...
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