This paper presents a bonding-less 5-GHz RFID tag module using an 85% downsized RFID tag chip and a 97% downsized antenna. Inductive (or magnetic) coupling between the antenna and the chip realizes low cost bonding-less implementation. Compared with a conventional module operating in the UHF band, the proposed module operating in the 5GHz range is downsized in terms of both the chip and the antenna sizes. The experimental results confirmed that the proposed RFID tag module successfully works at 20 cm away from a reader whose output power is 15 dBm, achieving the same figure of merit as a conventionally bonded module. Moreover, this paper confirmed that the misalignment tolerance of the inductive coupling can be up to 50 μm.

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