Design and Analysis of Fractal Based Monopole Antenna Backed with Modified Jerusalem Cross Frequency Selective Surface for Wireless Personal Area Communications

Abstract

This paper presents a low profile Single-layer Modified Jerusalem Cross Frequency Selective Surface (SMJC FSS) which functions as a band-stop filter to shield the 2.45 GHz Industrial, Scientific and Medical (ISM) band with a unit cell size of 0.249λg × 0.249λg × 0.027λg. Compared to JC FSS, 50% size reduction is achieved by the effect of capacitive and inductive loading. The proposed FSS exhibits a fractional bandwidth of 14.69% and fractional bandwidth dimension ratio (FBDR) of 8775.4, which is one of the highest among the single layer FSS. The Koch curve inspired fractal monopole antenna is backed by 5 × 5 FSS array, which contributes enhanced gain and fractional bandwidth of 6.28 dB and 23.75% respectively and has a net dimension of 75 × 75mm ×31.2 mm. The specific absorption rate (SAR) is analyzed on human arm model where proposed antenna attains 0.183 W/Kg, which makes it appropriate for the application of body area communication. The measured results agree well with the simulated results and hence it is validated for wireless personal area communications in the ISM band at 2.45 GHz.