International Journal of Engineering Science Invention Research & Development; Vol. I Issue VII January 2015 www.ijesird.com e-ISSN: 2349-6185 Manish Kumar , Mithilesh Singh and Abhishek Saini ijesird, Vol. I (VII) January 2015/223 A Design of Sierpinski Fractal Antenna for Dual Band And Effect Of Inserting Grid On Performance Parameter Manish Kumar # , Mithilesh Singh # , Abhishek Saini # # Department of Electronics & Communication Engineering # Bhagwant Institute of Technology , Muzaffarnagar man_kum2007@yahoo.co.in Abstract- In this paper a dual band Sierpinski fractal antenna is proposed and result is taken by means of simulation after that a layer of low permittivity is inserted between the ground plane and the conducting plane and effect is also taken in account. So this is the two fold antenna which radiate efficiently at 520 MHz and 2.775 GHz. This frequency range can be effectively used in future telecommunication purposes in LTE. Key words-Dual Band, Sierpinski Fractel, LTE application. I INTRODUCTION Today the fractal antenna has a variety of use due to low cost, low profile, multiband and broadband nature. There are many structure have been proposed that will be used in future of telecommunication technology. Fractals are the small geographical structures that repeat themselves. This antenna is also a fractal antenna based on sierpinski fractal shape [1]-[4]. In this paper this antenna exhibits good impedance matching at centre frequencies. The Sierpinski gasket is named after the Polish mathematician Sierpinski who described some of the main properties of this fractal shape in 1916.The original gasket is constructed by subtracting a central inverted triangle from a main triangle shape as shown in Fig. 1. After the subtraction, three equal triangles remain on the structure, each one being half of the size of the original one. This is the first iteration of the Sierpinski fractal generation. One can iterate the same subtraction procedure on the remaining triangles and if the iteration is carried out an infinite number of times, the ideal fractal Sierpinski gasket is obtained. In such an ideal structure, each one of its three main parts is exactly equal to the whole object, but scaled by a factor of two and so is each of the three gaskets that compose any of those parts. Due to this particular similarity property, shared with many other fractal shapes, it is said that the Sierpinski gasket [5] is a self-similar if a fractal antenna[6]-[8] is based on this type of geometry that will be multiband in nature. Original triangle 1st iteration 2nd iteration (Stage 1) (Stage 2) (Stage 3) Figure 1. Sierpinski fractal generation up to 2 nd Iteration II. ANTENNA DESIGN: With the help of research paper [1].firstly a dimension of 33×76 mm of ground plane is taken. On ground plane firstly a triangular patch at 0.8 mm is formed whose dimensions are given below. For radiating plane dielectric constant is taken 3.38 i.e Arlon Material with loss tangent 0.0025. İr=3.38, į=0.0025 a b c d e f g h i j 76 33 5 0.5 36.71 18.73 10 43.81 39.3 43.02 Table: Dimension of Antenna Geometry in mm Part:1 The Geometry is given in figure 2.This structure is simulated by means of coaxial cable whose feed line dimension is also given. Simulated structure