Abstract
An Ultra High Frequency (UHF) half-loop antenna used in Radio Frequency Identification (RFID) systems is proposed with a planar patterned metamaterial structure of compact size. The size of the planar patterned metamaterial structure is (0.20λ*0.20λ*0.0023λ') mm3. This antenna consists of two metamaterial unit cells having negative permittivity and permeability. Simulation results of input return loss, radiation pattern, and directivity of this antenna are presented using CST software. A comparison between the conventional antenna and the new metamaterial half-loop antenna is also provided. The simulated results show that the metamaterial antenna has a resonance frequency of 0.866 GHz, a realized gain of 1.96 dB, and an efficiency increase of about 20%. Simulation and measurement results are in perfect agreement, which proves that the proposed antenna can operate in the UHF band for RFID systems.
Highlights
Nowadays, antennas play a very important role in tracking any object using the automatic identification technology
The Ultra High Frequency (UHF) Radio Frequency Identification (RFID) systems are used in different regions of the world
This work treats a half-loop antenna coupled with a novel structure of metamaterial to decrease the resonance frequency by 20% and increase the gain by 76%
Summary
Antennas play a very important role in tracking any object using the automatic identification technology. There are several methods of reducing the size of the antenna such as the use of short circuits (PIFA), slot antennas, and fractal shapes [9][12] These techniques do not allow having a good performance in terms of impedance, directivity, and large wide band, the interest in the use of metamaterials [13], [14] to decrease the resonance frequency and maintain the performance of the antenna. The second section shows the simulation results for the proposed antenna presenting the return loss and the realized gain, that’s why in the thirst section; the antenna is coupled with metamaterial to achieve the desired results in terms of the resonance frequency, realized gain and radiation pattern. The metamaterial is validated by the experimental result
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