A Small Metal Insensitive UHF RFID Tag for Temperature Measurement Based on LTCC Technology

A novel passive UHF RFID tag based on Low-temperature co-fired ceramic (LTCC) technology has been reported in this paper, This tag is composed of a tag antenna and RFID temperature measurement chip embedded in LTCC substrates, with a size of 25 mm × 9 mm × 5 mm. The bandwidth of S
11
is 80MHz, and the realized gain of −11.4dB is obtainable at the resonant frequency of 920MHz with a metal plate size of 200 × 200 mm
²
.