This paper presents a passive cavity type Ultra High Frequency (UHF) Radio Frequency\nIdentification (RFID) tag antenna having the longest read-range, and compares it with existing\nlong-range UHF RFID tag antenna. The study also demonstrates mathematically and experimentally\nthat our proposed longest-range UHF RFID cavity type tag antenna has a longer read-range than\nexisting passive tag antennas. Our tag antenna was designed with 140 * 60 * 10mm3 size, and reached\n26 m measured read-range and 36.3 m mathematically calculated read-range. This UHF tag antenna\ncan be applied to metal and non-metal objects. By adding a further sensing capability, it can have a\ngreat benefit for the Internet of Things (IoT) and wireless sensor networks (WSN).
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