A compact stacked Quasi-fractal microstrip antenna for RFID applications

In this paper, we propose a new compact quasi-fractal shaped microstrip antenna that consists of a hexagonal patch as the main radiator and a complementary stacked patch as the parasitic element. The overall surface of the proposed quasi-fractal patch is about 55% lower than the conventional hexagonal patch. Using the stacked technique, the gain reduction of the compression technique is almost compensated for the proposed antenna while the total gain is reduced by about only 1 dBi. Experimental results show that the operation frequency of microstrip antenna is about 2.5 GHz which covers the microwave frequency band of radio-frequency identification systems.