Vol. 5, Issue 1, Part E (2019)

Abstract
In this paper the AMD substrate was constructed with single SRRs arrayed in both x and y directions. The antenna consisted of a square patch, an AMD substrate, a ground, and a Wilkinson power divider. Each component was printed on an FR-4 substrates; four substrates had dielectric constant of 4.4 and different thicknesses. The designed antenna has an impedance bandwidth of 460 MHz (48%), a peak gain for right handed circular polarization of 0.55 dBic, and an axial ratio of less than 1.7 dB. The sizes of the antenna and radiating patch, respectively, are 100 mm × 100 mm × 5:2 mm and 65 mm × 65 mm (0:199l₀ × 0:199l₀). Because of the designed antenna's compact size, good CP characteristics and suitable gain, it is appropriate for use in UHF RFID handheld readers operating in the Korea RFID band (917–923.5 MHz).