P.Muthu Kannan et al. / International Journal of Engineering and Technology Vol.3 (6), 2011-2012, 442-446 Dual Band Rectangular Patch Wearable Antenna on Jeans Material P.Muthu Kannan, V.Palanisamy Associate Professor, Department of ECE, Associate Prof. & Head i/c, Department of CSE, Galgotias University, Alagappa University, Greater Noida, India. Karaikudi, India. Email: pmkannan@gmail.com Email: vpazhanisamy@yahoo.co.in Abstract- Wearable substrate such as cotton, jeans, and leather is utilized to prepare flexible antenna. These antennas can be placed on the dress materials. It is easier to carry the antenna also. The preparation of wearable antenna is to be done as per the mathematical design carried out for a normal micro strip patch antenna. In this paper, a dual band rectangular antenna which operates around 0.9 GHz and at 2.4 GHz is designed, simulated and fabricated based on Jeans cloth. The connectivity between the two rectangular patches is done with few arms. The number and width of those arms are varied and corresponding effects are studied. Keywords – Wearable Antenna, Jeans, Arms, Return Loss, VSWR. I.INTRODUCTION Micro strip antennas are considered to be the antenna for the future. All conventional antennas are now fabricated in micro strip form. Micro strip antennas have the advantages of light weight and easiness to carry anywhere. Micro strip antennas are to be constructed based on a dielectric material called ‘Substrate’. The height of the substrate is another important factor. For a fixed resonant frequency, the design of a micro strip antenna is carried out based on dielectric constant of substrate material and its height. Materials which are used as substrates are FR4, Rogers, Duroid etc., It is possible to design and fabricate micro strip antenna with substrates such as cotton, jeans and leather. These antennas are known as wearable antennas or textile antennas. As these substrates are cloth material, user can wear this as clothes. It is easier to carry the wearable antenna. In this work, a dual band wearable antenna in rectangular shape is designed and simulated. The dual band requires two rectangular shapes which are connected with ‘arms’. The width of the arms and the number of arms are varied and their effects on antenna characteristics are studied. II. THE DESIGN To implement dual band characteristics of micro strip antennas, various methods are being used. One of the methods is to provide two rectangular patches designed for specific frequency and then bridging the gap between them [1]. In this work, the same technique is used but wearable substrate is selected. Various clothing materials such as cotton, jeans and leather can be used as substrates for a textile antenna. In this work, jeans cloth is used as substrate because of its strength and ruggedness. The dielectric constant of jeans cloth is found out as 1.6. The normal design of rectangular patch as per the literature is used to design the rectangular patches. One resonant frequency is fixed at 0.9 GHz which is a frequency for mobile communication and the other frequency is fixed at 2.4 GHz which is frequency of WLAN. The rectangular patches are designed for the above mentioned frequencies. The following Steps are to be followed in designing a rectangular patch wearable antenna [3]. Step1: Calculation of the width (W): ISSN : 0975-4024 Dec 2011- Jan 2012 442