Single-Layer Truncated Patch Antenna With an Inclined I-Slit for Anti-Metal Tag Design

A simple, single-layer anti-metal tag that is designed using a truncated patch antenna has been proposed. The patch configuration is simple as it only requires the use of two truncated corners and an inclined I-slit as its effective tuning mechanisms, all of which can be easily made on the single surface of a substrate. With the application of the two tuning mechanisms, the tag resonant frequency can be easily tuned by adjusting the geometrical parameters of the truncations and the I-slit, without the involvement of metallic vias/stubs and multiple-layer structures. It makes such a tag convenient for mass manufacturing. The proposed tag has a miniature size (40 mm $\times $ 40 mm $\times 1$ .6 mm or $0.1224\lambda \times 0.1224\lambda \times 0.0049$ $\lambda $ ). It can be effectively read from a distance of $\sim ~7$ .5 m (4W Effective isotropic radiated power - EIRP) on metal.