` Multi Application Antenna for Wi-Fi, Wi-max and Bluetooth for better radiation efficiency Hina D.Pal, PG student, KCG College of technology, Karapakkam, Chennai-600097 J.Jenifer, PG student, KCG College of technology, Karapakkam, Chennai-600097 Kavitha Balamurugan, Associate Prof. KCG College of technology, Karapakkam, Chennai-600097 M.E,Suntheravel, Assistant Prof. KCG College of technology, Karapakkam, Chennai-600097 ABSTRACT: This paper presents the radiation performance of rectangular patch antenna having a two slots. The design is used for three different frequencies 2.4, 5 and 7GHz . As a substrate material Cu_clad is used. The simulated results for this antenna are obtained by varying the length and width of three dipoles.The results indicate that rectangular patch antenna with two slots offers a good antenna efficiency 41.576 at 2.45 GHz,51.958 at 5 GHz,46.810 at 7 GHz with the input feed 50 Ohm. . Desired patch antenna design was simulated by ADS simulator program. ADS supports every step of the design process—schematic capture, layout, frequency-domain and time-domain circuit simulation, and electromagnetic field simulation, allowing the engineer to fully characterize and optimize an RF design without changing tools. With ADS’s Wireless Libraries and circuit- system-EM co-simulation technology, ADS provides full, standards-based design and verification within a single, integrated platform. In view of design, selection of the patch width and length are the major parameters along with the feed line dimensions. Key words: Wi-Fi, Wi-max and Bluetooth, ADS, Micro strip Patch, 2.4, 5 and 7GHz INTRODUCTION: In this paper the good efficiency is offered by modified Microstrip Patch antenna which operates at frequency range 2 to 11GHz has been discussed in detail. Microstrip patch antenna has been received tremendous attention since the last two decades and now it becomes a major component in the development of Wi-Fi, Wi-max and Bluetooth. Microstrip antenna is a printed type antenna consisting of a dielectric substrate sandwiched in between a ground plane and a patch. In this project Micro strip patch antenna technology is used for different application for different frequencies different materials are used for better efficiency. Fig.1:Patch layout mashed structure These are preferred over other types of radiators because of its low profile and light weight but its major drawback is its low antenna efficiency and low gain. This is one of the problems that researchers around the world have been trying to overcome. International Journal of Scientific Engineering and Applied Science (IJSEAS) - Volume-1, Issue-4, July 2015 ISSN: 2395-3470 www.ijseas.com 498