Design Of Electrically Small, Folded Monopole Antenna Using C-shaped Meander For Active 433.92 Mhz Rfid Tag In Metallic Container Application

摘要

A miniaturised RFID tag antenna for an active 433.92 MHz RFID system was designed, fabricated and measured. To attain a low profile, a folded monopole was bent and matched with a stub like an inverted-F antenna. Then the horizontal radiating segment was miniaturised with a C-shaped meander. The height of the antenna from the ground plane was 20 mm (0.029A) and the antenna can be enclosed in a circle with a diametcr of 34 mm (0.049A). The measured -10 dB fractional bandwidth was 3.52 MHz (0.81%) and the measured gain showed a conical radiation pattern with a maximum gain of-1.33 dBd.