Abstract-In this study, we present an implementation of Ultra Wide Band (UWB) Koch Snowflake antenna for Radio Frequency Identification (RFID) applications. The compact antenna, based on the Koch Snowflake shape, is fed by coplanar waveguide (CPW) and by microstrip line with an overall size of 31 × 27 × 1.6 mm 3 . The simulation analysis is performed by CST Microwave Studio and compared with HFSS software. The antenna design exhibits a very wide operating bandwidth of 13 GHz (3.4-16.4 GHz) and 11 GHz (3.5-14.577 GHz) with return loss better than 10 dB for microstrip line antenna and CPW antenna respectively. A prototype of CPW and microstrip antenna was fabricated on an FR4 substrate and measured. Simulated and measured results are in close agreement. The small size of the antenna and the obtained results show that the proposed antenna is an excellent candidate for UWB-RFID localization system applications.

In this work, a simple and efficient approach to design a microstrip diplexer is proposed. It is based on the combination of two compact Square Open Loop Resonator band pass filters. These filters are designed for Radio Frequency Identification application at 2.45 GHz frequency. Using the Chebychev approximation, the two filters and diplexer are designed, simulated, fabricated, and measured. The results show that the diplexer presents a high selectivity, a good insertion loss and high isolation (>40 dB) with the compact size. The diplexer also shows a good performance when associated with the patch antenna operating at 2.45 GHz.

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In this paper, dual-band radio frequency identification (RIFD) reader antenna is proposed. The reader antenna operates at 2.45GHz and 5.8GHz. It comprises two resonances the first in the radiation patch, and the second in the protruding stub in the ground plan. The matching techniques that use stub tuning are used in this work. The radiating patch of the present compact antenna has the dimension of 15.6mm x 8.8mm. A good impedance bandwidth of 148.48MHz and 204.85MHz has been achieved for 2.45GHz and 5.8GHz respectively. The proposed antenna is simple, compact in size, providing a good gain and broadband impedance matching.

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