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Abstract
This paper presents a compact microstrip antenna that can be attached to a metallic object to form a passive radio frequency identification (RFID) tag operating in the UHF band. The proposed antenna was etched on an FR4 substrate with an overall size of 60mm×45mm×1.6mm, and it consists of a matching network, two radiating patches, and a ground plane. Each patch was extended using a meandered strip and was shorted to the ground plane via four metalized via holes to form a planar inverted-F antenna (PIFA). When mounted on a 50×50cm2 copper plate, the proposed antenna provided a 10-dB impedance bandwidth of 37MHz (901∼938MHz) and a power transmission coefficient (PTC) of 0.86 at a frequency of 915MHz. Moreover, the maximum reading range of the prototype metallic RFID tag, measured using an UHF RFID reader system, reached about 6.2 m at 4-W EIRP radiation power.
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