103 Volume-3, Issue-6, December-2013, ISSN No.: 2250-0758 International Journal of Engineering and Management Research Available at: www.ijemr.net Page Number: 103-105 CAD Model of Connected Rectangular Ring Microstrip Antenna for Dual band Operations Hasanujjaman 1 , Mehedi Hasan 1 , Arindam Biswas 2 1 Department of ECE, Dumkal Institute of Engineering and Technology, Mushidabad, West Bengal, INDIA 2 Dr. B.C Roy College of Engineering, Fuljhore More, Durgapur, INDIA ABSTRACT In this paper, we have designed connected rectangular ring microstrip antenna (MSA) for C-band & X-band wireless applications. The beauty of this antenna is use of single patch which make it easy to fabricate consequently antenna become cheaper. We have design dual-band antenna which have resonance frequency 5 GHz and 9 GHz. Return losses for both centre frequency have less than -10 dB. All simulation was done using IE3D. Key Words: Microstrip Antenna, Dual band, Return Loss, Resonance Frequency, IE3D. I. INTORDUCTION Antenna which can work in more than one frequency region either for transmitting or receiving electromagnetic (EM) waves are termed as Multiband Antenna. Such antenna is usually used for dual -band, tri -band, quad- band and penta-band application. Using only single antenna in the multi signal band is better than using the each antenna element in the separate way. Here we have design proposed antenna using IE3D simulator which are based on Trial and Error method [1]. Planar antenna designs, such as “microstip antennas” are often preferred for mobile and satellite communication antennas due to their added advantage of small size, low manufacturing cost and conformability. In recent years square microstrip antennas have found increasing demand in communication scenario due to their polarization diversity, particularly ability to realize dual or circularly polarized (CP) radiation patterns [2–3] Microstrip patch antennas are widely used because of there many merits such as the low profile, light weight, low cast and planar also. However patch antenna have a disadvantage of narrow bandwidth typically 1-5 % impedance bandwidth [4]. Researchers have made many efforts to overcome this problem and many configurations have been presented to increase the bandwidth [5-6]. Many configuration while increase the bandwidth but it also increase the production cast of antenna due to misalignment of stacked patches .To overcome misalignment problem ,we have to use lesser no of patches. In this paper we have design antenna using only single radiation patch which make it easier to fabricate consequently antenna becomes cheaper. We have use coaxial probe feed technique which create inductive reactance to compensate inductive impedance. In this paper, we have designed dual-band antenna having resonance frequency 5 GHz and 5 GHz. Return losses for both centre frequency have less than -10 dB. II. THE ANTENNA STRUCTURE A typical structure under investigation is shown in Fig. 1. We have calculated the width and length of rectangular patch individually considering X band and C band respectively at resonance frequency .Next, depending on the previous calculations we dig some portion and connect both the rectangle to manifest the model. Here we used only single radiation patch which make it easier to fabricate consequently antenna and coaxial probe feed technique to create inductive reactance to compensate inductive impedance. Fig. 1: Top and front view of connected rectangular ring microstrip antenna (MSA)