Abstract
This paper discusses concerning design of circular patch microstrip antenna for Radio Frequency Identification (RFID) tags application in microwave band. Circular microstrip antenna is designed with an egg slot on the ground plane and feed line to get ultra wideband. The design of microstrip antenna using Phenolic White Paper-FR2 with dielectric constant (or) =4.5. Based on simulation results, the antenna shows it works at frequency 2128-4807 MHz with gain of-17,398 dBi. The rectangular stub, caused the decreasing of bandwidth but the gain increase. By adding a rectangular stub on the ground plane, antenna works at frequency 1166 3475 MHz with increasing gain of-2,733 dBi.
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