Abstract
A compact dipolar patch, which has a dimension of $23~\text {mm} \times 16~\text {mm} \times 1.6~\text {mm}~(0.0702\lambda \times 0.0488 \lambda \times 0.0049 \lambda )$ , is designed for mounting on metal. The proposed antenna consists of a dipolar patch which is split by a narrow meandered slot into two halves. The narrow meandered slot is highly reactive and it is instrumental for scaling down the tag resonant frequency. Most importantly, the narrow slot does not affect the radiation characteristics of the patch resonator much, making the resonant frequency lower. In the design, the patches are stub-shorted to ground, where two inductive thin stubs are used for frequency adjustment. A simple equivalent circuit has been derived for studying the tag impedance characteristics. The proposed tag antenna can be read from beyond 4.5 m (at effective isotropic radiated power of 4 W) on metal. It can also be read from at least 2 m when used for dielectrics with $\varepsilon _{r}$ in the range of 1–12.
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