Abstract
A radio frequency tag (33 x 30 x 5 mm) operating at a frequency of 867MHz has been developed. The design of the tag consists of the radiating part of the antenna in the form of metal plates forming a capacitor, a slot transmission line that is part of a highly inductive impedance transformer, a conducting circuit, the ends of which are connected to the chip, and a chip. The proposed transformer is designed to convert the capacitive impedance of the chip into a high-quality inductance, which can be connected to the emitting element in the form of a capacitance. The slot transmission line practically forms a quarter-wave section. A numerical calculation of the proposed tag was carried out and a method for achieving complex matching of the impedances of the chip and the rest of the tag was presented. The matching of the active and reactive components of the impedances occurs in independent ways: by varying the size of the slot transmission line and the width of the jumper that is part of the conducting circuit. The measurement of the tag developed by modeling was carried out. The results showed that the tag can be read from a distance of several meters when it is placed on various dielectric surfaces.
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