Microstrip Antenna Based on Crystal Polymer Liquid (LCP) Textile for RFID Medical application

In This paper, we present a new design of multi band microstrip antenna operating at ISM band for RFID medical application. The proposed antenna is designed with LCP liquid crystal polymers substrate, which resists the effect of humidity thus allowing the antenna to keep its performance stable in an underground environment. The flexible LCP characteristics for the designed microstrip antenna is $h=4\mathrm{~mm}$ thickness, 3.16 relative permittivity and 0.025 loss tangent. The dimension of the proposed antenna is $57\times 59\times 4\mathrm{~mm}^{3}$ and the conductive parts were made of copper material. The proposed structure is light, flexible and at low cost. The study parameters are affected with integrating of slot in the ground plane for miniaturized of the size of the antenna for operating at the resonance frequency of 2.4GHz and 5.8 GHz. The peak gain is 2.94dBi at 2.45GHz and 5.39dBi at 5.8GHz and radiation efficiency is 70%. The proposed antenna is simulated using CST Microwave studio Software, and results obtained are optimized and they exhibit good radiation characteristics within ISM Band.