A multiband circularly polarized microstrip patch antenna including a Minkowski fractal slot for wireless communication applications in the frequency bands 1.39 GHz, 2.45 GHz (WLAN band), 3.48 GHz (Mobile Wi-Max), 5.8 GHz (U-NII high-band), and 6.29 GHz has been proposed. The proposed antenna consists of two substrates mounted on top of the ground plane. The antenna has been fed with a 50 Ω microstripline which is etched on top of the lower substrate. The second iteration Minkowski fractal slot is etched on a truncated square patch which is on top of the upper substrate. The substrate has a size of 80 mm × 82 mm × 1.6 mm. The measured results show that the proposed antenna could excite for five resonant bands of 1.
Abstract-An SRR loaded compact RFID tag for broadband operation over the UHF RFID band is presented. The tag antenna structure is composed of a dipole whose arms are symmetrically loaded with square split ring resonators (SRRs) along a short circuited strip between the SRRs. The antenna is made inductive and reduced in overall size by the SRR sections. The measured read range characteristics of the proposed RFID tag with an RFID chip Alien Higgs-3 are presented. The proposed tag operates over the entire UHF RFID band about a maximum read range of 7 meters in the entire elevation angular ranges and over wide azimuthal angular ranges.
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