A SMALL SIZE ANTENNA FOR UHF RFID TAG MOUNTABLE METALLIC OBJFCTS

This letter presents the design of a small and low profile RFID tag antenna in the UHF band that can he mounted on metallic objects. The size of the proposed tag is 40mm x 24mm x 3mm The sloted patch inductively fed by a couple loop with a shorting vole, further more by adding parasitic patches which are coupled the driven patch to enhance the bandwidth of the tag. The designed tag antenna can work at the 920 MHz frequency hand and is able to maintain a good performance on the metal surface with 3dB return loss bandwidth of the proposed antenna is 45MHz,and the gain of the antenna is 2.1dB,which satisfactorily operates on metal plates, so it is applicable in many applications.