Journal
IEEE TRANSACTIONS ON ANTENNAS AND PROPAGATION
Volume 66, Issue 4, Pages 1788-1795Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/TAP.2018.2803132
Keywords
Metal-mountable tag antenna; orientation insensitive; UHF tag antenna
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An orientation insensitive dipolar patch antenna, which has a dimension of 30 mm x 30 mm x 1.6 mm (0.0915 lambda x 0.0915 lambda x 0.0049 lambda), is proposed for designing a metal mountable tag. It consists of two pairs of orthogonal dipolar patches, which are placed in such a way that their inherent blind spots and null points are all removed. The tag antenna is readable in all directions in the boresight. Highly inductive thin stubs are inserted into the patches, and they are stub shorted to ground for increasing the tuning range of the operating frequency. A simple equivalent circuit model has been derived for visualizing the tag impedance characteristics. The proposed tag antenna can be read in the range of 2.9-3.5 m (at effective isotropic radiated power of 4 W) covering the entire azimuth plane when mounted on a metal plate with a dimension 20 cm x 20 cm. It can also be read from at least 2 m omnidirectionally when used for dielectrics with epsilon(r) in the range of 1-12.
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