Dual-Band Size Deducted Un-Equal Arm Y-Shaped Printed Antenna for Space Communications Bipadtaran Sinhamahapatra #1 , Supriya Jana #2 , Sudeshna Dey #3 , Arnab Das #4 , Bipa Datta #5 , Moumita Mukherjee *6 , Samiran Chatterjee ^7 #1,2,3,4,5 ECE Department, West Bengal University of Technology, Brainware Group of Institutions, Barasat, West Bengal, India *6 Centre for Millimeter wave Semiconductor Devices and Systems, University of Calcutta, West Bengal, India ^7 University of Kalyani, Kalyani, West Bengal, India Abstract— In recent years, with the continuous growth of communication service and the constant miniaturization of communication equipment, where printed antennas for their small volumes, low profiles, excellent integration and good performance, is higher demands for the volume of antennas and working band. A dual-band deducted un-equal arm Y-shaped printed antenna is thoroughly simulated in this paper. Resonant frequency has been reduced drastically consists of Y-shaped slot in middle point located from the antenna. More importantly, it is also shown that the differentially-driven microstrip antenna has higher gain of simulated 4.69 dBi at 6.23GHz and 4.18 dBi at 9.56GHz and beam width of simulated 170.38 0 at 6.23GHz & 166.131 0 at 9.56GHz of the printed antenna. Compared to a conventional microstrip patch antenna, simulated antenna size has been reduced by 52.02% with an increased frequency ratio. The initial design and optimization of the printed antenna is operating in X band (8-12GHz). Keywords— Compact, Patch, Slot, Resonant frequency, Bandwidth, Printed Antenna. I. INTRODUCTION In recent years, demand for small antennas on wireless communication has increased the interest of research work on compact microstrip antenna design among microwave and wireless engineers [1-6]. Because of their simplicity and compatibility with printed-circuit technology microstrip antennas are widely used in the microwave frequency spectrum. Simply a microstrip antenna is a rectangular or other shape, patch of metal on top of a grounded dielectric substrate. Microstrip patch antennas are attractive in antenna applications for many reasons. They are easy and cheap to manufacture, lightweight, and planar to list just a few advantages. Also they can be manufactured either as a stand-alone element or as part of an array. However, these advantages are offset by low efficiency and limited bandwidth. In recent years much research and testing has been done to increase both the bandwidth and radiation efficiency of microstrip antennas [7-8]. Due to the recent interest in Y-shaped printed antenna was developed to meet the need for a cheap, low profile, broadband antenna. This antenna could be used in a wide range of applications such as in the space communications or satellite communication. Our aim is to reduce the size of the antenna as well as increase the operating bandwidth. The proposed antenna (substrate with ε r = 4.4) has a gain of 4.18 dBi and presents a size reduction of 52.02% when compared to a conventional microstrip patch (10mm X 6mm). The simulation has been carried out by IE3D [14] software which uses the MoM method. Due to the small size, low cost and low weight this antenna is a good entrant for the application of C-Band of satellite communication and X-Band for microwave communication. Now this global Ku- band markets have become very expensive, and there is now we started look at X- band. The C-band and X-Band defined by an IEEE standard for radio waves and radar engineering with frequencies that ranges from 4.0 to 8.0GHz and 8.0 to 12.0GHz[10] respectively. The X [11-13] band is used for short range tracking, missile guidance, marine, radar and air bone intercept. Especially it is used for radar communication ranges roughly from 8.29GHz to 11.4GHz .In this paper the microstrip patch antenna is designed for use in space communication satellites at 9.56GHz and satellite communication at 6.23 GHz. The results obtained provide a workable antenna design for incorporation in a space communication. When the three satellites located approximately 120 degrees apart in longitude than Deep Space Network (DSN) stations are capable of using the older and lower S-band deep-space radio communications allocations, and some higher frequencies on a more-or-less experimental basis, such as in the X-band. This X band communications includes the spacecraft landers for planet. [15]. International Journal of Engineering Research & Technology (IJERT) Vol. 2 Issue 1, January- 2013 ISSN: 2278-0181 1 www.ijert.org