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A compact dual-band dielectric resonator antenna (DRA) using a parasitic c-slot fed by a microstrip line is proposed. In this configuration, the DR performs the functions of an effective radiator and the feeding structure of the parasitic c-slot in the ground plane. By optimizing the proposed structure parameters, the structure resonates at two different frequencies. One is from the DRA with the broadside patterns and the other from the c-slot with the dipole-like patterns. In order to determine the performance of varying design parameters on bandwidth and resonance frequency, the parametric study is carried out using simulation software High-Frequency Structure Simulator and experimental results. The measured and simulated results show excellent agreement.

A developing innovative technology of dual S-loop antenna is proposed for near-field operations in the Ultra-High Frequency Band. The UHF RFID reader antenna can be generated a strong and uniform electromagnetic field in a near-field zone of the dual-loop. The proposed full wave dual loop antenna is suitable for handheld radio frequency identification reader, especially for water applications in the food-production chain. The reader achieved a long transmission range with a compact size and practical scientific application.