International Research Journal of Engineering and Technology (IRJET) e-ISSN: 2395-0056 Volume: 07 Issue: 05 | May 2020 www.irjet.net p-ISSN: 2395-0072 © 2020, IRJET | Impact Factor value: 7.529 | ISO 9001:2008 Certified Journal | Page 7532 Wearable Button Antenna For Dual Band Applications Dr.R.Ahila Priyadharshini, P.Aruna Devi, M.Soniya Varshini --------------------------------------------------------------------------------------------------------------------------------------- Abstract— A Wearable Button Antenna for dual band application is presented in this paper. The designed antenna is working in 7GHz (C band)and 9 GHz(X band) frequency bands. We design the frequency bands with micro strip feed. The antenna satisfies -16 DB at 7 GHz and - 26 DB at 9 GHz. This antenna exhibits good VSWR, better impedance and satisfied gain. The design is simple, compact and can be used for wearable applications in both bands. Keywords—dual band , wearable ,micro strip, slot I. INTRODUCTION Antennas are essential component of any communication systems. Wearable antennas have gained attractions in many of the fields in recent years. A wearable antenna is one that is designed to function when it is being worn. These antenna can serve as part of our clothes and used for many purposes. There are few challenges associated with this wearable antenna. It should not interrupt the movement of the wearer. Since human body is loss material for electromagnetic waves, it absorbs electromagnetic waves and converts the electric energy into heat energy. Therefore ,the efficiency of the antenna may get reduced. It is a micro strip feed antenna with circular patch and filleted edges on the substrate. The edge filleting of substrate helps to alter the sharpness and shape of the edge and provide smooth transitions between faces of the substrate. The design has circular radiating patch and resembles button shape. Since this design resonates in C band and X band, it can be used in many applications such as satellite communication, military defence tracking ,weather radar systems and wireless computer networks. II. LITERATURE SURVEY Antennas are the integral part of the wireless communication .Antennas have the capability to transmit and receive signals. With the advancements in technology ,Wearable antennas play a vital role in wide array of fields. These antennas have the capability to operate in more than bands.[1][2].The proximity to human body is the major challenge associated with this wearable antenna. [3]Wearable antenna should not interrupt the movement of the wearer .This antenna resembles a button shape due to its circular patch. Button antennas can also be integrated with clothes at several specific locations around the human body[4]. Button antennas [6]have several advantages compared to textile antennas. Textile antennas[5] are the special type of antennas that are partially or entirely made up of textile material. Button antennas are rigid in most of the circumstances. PTFE Taconic ceramic material [7] is used as the substrate in the design. The substrate is edge filleted to obtain a perfect shape. The slots in the circular patch helps the antenna to resonate in dual bands such as C Band and X Band[8].C Band frequency ranges from 4 -8 GHz. C Band has main application in satellite communication[9].X Band frequency ranges from 8 -12 GHz. The applications of X Band [10]such as weather radar systems, military defence tracking etc. III. ANTENNA DESIGN The proposed antenna is designed in the form of radiating circular patch so that it gives the shape of a normal button. The substrate used to design the wearable button antenna is the PTFE TACONIC substrate with a thickness of 3.18 mm and it has a permittivity of 10. The Taconic substrate is an organic ceramic laminate. It is denoted as Taconic CER-10. The benefits of using this substrate is it has exceptional inter-laminal bond, low moisture absorption, enhanced dimensional stability and circuit board miniaturization. The copper is used as a material for the radiating circular patch and the ground plane is also made of copper .The circular patch has a diameter of 20.24mm. The edge of the substrate is edge filleted in order to obtain the shape of a button. Here we are using copper because it is the efficient conductor of electrical energy. The feed used here is the micro strip feed. The proximity to the human body is reduced by designing the entire ground plane on the bottom patch. Two slots with radius 1.8mm and 2mm are designed on the patch. The two slots are drawn into the circular patch to have dual band resonance and gain enhancement. The circular radiating copper patch and the feed has been united. These slots are used to resonate the antenna at two different bands that is the C band (7 GHz) and the X band (9 GHz). (a) (b) Fig 1: Antenna structure (a)Top View (b)Bottom View IV.DESIGN EQUATIONS The radius of the circular patch is obtained by the following equation: Where h is the height of the Taconic substrate