PSO Optimized Nested Slot Structure RFID Tag Antenna at 5.8 GHz for Metallic Applications

In this paper, a nested slot tag antenna is proposed in this paper to ensure conjugate impedance match between the tag antenna and the chip. The H-shaped tag antenna is optimized by using interfacing CST Microwave Studio with MATLAB. The optimization goal is to maximize power transfer to the chip by designing the tag antenna impedance to be conjugate to the chip impedance. The proposed antenna design shows good performance in terms of volumetric size, gain and impedance with dimensions of 11.2 x 12.8 x 0.8 mm3. Particle swarm optimization (PSO) algorithm is utilized and is found to be suitable algorithm to design the tag antenna. The simulated gain of antenna is 5.76 dBi.

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