Dual band Microstrip Antenna for GPS/ WLAN/WiMax Applications 1Rajeev Shankar Pathak, 2Vinod Kumar Singh, 3Shahanaz Ayub ABSTRACT : Keywords

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1 Dual band Microstrip Antenna for GPS/ WLAN/WiMax Applications 1 Rajeev Shankar Pathak, 2 Vinod Kumar Singh, 3 Shahanaz Ayub 1 S.R.G.I. Ambabai, Jhansi, India 2 S.R.G.I. Ambabai, Jhansi, India 3 B. I.E.T., Jhansi, India ABSTRACT: In this paper dual wide band microstrip antenna has designed for wireless applications. The return loss bandwidth achieved is 12.34% ( ) GHz & 21.56% ( ) GHz with a maximum return loss db at resonant frequency GHz. A parametric study is conducted using commercial simulation software IE3D based on the method of moments. Keywords: Rectangular slotted shape MSA, dual band, Radiation pattern, Radiation efficiency, VSWR & IE3D. I INTRODUCTION To support wireless communication, Microstrip antennas consider being communicative Device. These devices consist of very profitable qualities as small size, convenient cost, low Profile & Light Weight. [1-2]. However microstrip antenna inherently has narrow bandwidth. But to improve the bandwidth of MSA by creating several resonant structures into one antenna. We can Achieved this by adding more layers, more patches or more extra components. Dual-band antenna may be achieved by several techniques. It is observed that dual-band MSA can be achieved by inserting the T-slot into the microstrip patch. After the rapid development in communication System, Wireless Local Area Networks (WLANs) are widely used all over the world. The IEEE b and IEEE g standards utilizes the 2.4 GHz ISM Band. Being the frequency band license free, the WLAN equipment have to suffer interference from Microwave Ovens, Cordless Phones, blue tooth devices and other applications that use this same band. The a standard uses the cleaner to support the high speed WLAN as 5 GHz; however different country used the different segment of the frequency band.. In the US the a system may use the GHz band. Some countries allow the operation in the GHz band. Dual-frequency operation of antennas has become a necessity for many applications in recent wireless communication systems, such as GPS, WLAN/ WiMax services operating at two different frequency bands. The low frequency antenna is very essential for satellite communication. A dual-frequency inset feed patch antenna can produce a dual-frequency response, with both frequencies having the same polarization sense with a low frequency ratio. As a less sensitive to feed position, it allows to use an inset planner feed. The main motto of this paper is to present a novel antenna configuration for dual-band operation. By controlling the frequency, we can achieve a wide range of bandwidth of12.34% ( ) GHz & 21.56% ( ) GHz with a Return loss db at resonant frequency GHz Page 154

2 II DESIGN AND LAYOUT The length and width of rectangular patch are calculated from given equations [1-4, c W 2 f ( 1) / 2 r (1) reff l h 1 1 h 2 r reff r W W h W h reff (2) (3) L e L 2 l (4) Table I. Proposed antenna design parameters Parameters Values Design frequency Height of substrate Ground plane length(l g ) Ground plane width (W g ) L W 2.8 GHz 1.6 mm 40 mm 60 mm 14 mm 33 mm L mm W 1 4 mm L 2 2 mm W 2 2 mm Page 155

3 Figure 1. Geometry of proposed antenna III. RESULTS AND DISCUSSION Various results from the analysis of the patch are shown in figures. Fig 2 shows the graph of return loss verses frequency. The Return Loss Bandwidth achieved is 12.34% ( GHz) & 21.56% ( GHz) with a Return loss db at resonant frequency GHz. Fig 3 shows the antenna and radiation efficiency. The maximum radiation efficiency is occurred 96% at 1.42 GHz and maximum antenna efficiency is obtained 93% at 1.48 GHz. Fig 4 shows the Smith chart verses frequency plot shows the input impedance which should be ideally 50Ω used for impedance matching. Fig 5 shows the graph of VSWR. The value of VSWR should be less than 2 for desirable communication. Fig 6 & 7 shows the 3D radiation pattern and 3D view of proposed antenna. Fig. 2 Return loss graph of proposed antenna Page 156

4 Fig. 3 Radiation and antenna efficiency graphs. Fig. 4 Smith chart of proposed antenna Fig.5 3D Radiation pattern of proposed antenna Page 157

5 Fig.6 3D view of proposed antenna IV CONCLUSION A novel design of a dual-band MSA with Dual band performance at 1.45 GHz and 2.63 GHz frequencies is proposed and it is observed that dual-band MSA can be achieved by inserting the T-slot into the micro strip patch. The proposed antenna can provide Bandwidths of 12.34% for first band and 21.56% for second band respectively. It is very suitable for GPS/WLAN/WiMax commutation system. REFERENCES [1] G. Khunead, J. Nakasuwan, N. Songthanapitak and N. Anantrasirichai, Investigate Rectangular Slot Antenna with L-shaped Strip, PIERS, China, Vol.3, pp , [2] I. J. Bahl and P. Bhartia, Microstrip Antennas, Artech house Inc., Dedham MA, [3] U. Kongmuang, Bandwidth analysis of dual-band asymmetric Y-shaped slit-loaded MSA, ECTICON, Vol. 1, pp , [4] S. Sakulchat, A. Ruengwaree, Dual Band Microstrip Antenna with Triangular Tuning Stub for WLAN Applications, ISAPE, China, pp , [5] J. Y. Jan, L. C. Wang, A Study on Broadband Printed slot Antennas with Regular Slots, TENCON, pp.1-3, [6] A. Balanis, Antenna Theory analysis and design,microstrip Antenna, Chapter 14, pp [7] O. Quevedo-Teruel, L. Inclan-Sanchez, and E. Rajo- Iglesias, Soft surfaces for reducing mutual coupling between loaded pifa antennas, Antennas and Wireless Propagation Letters, IEEE, [8] Ali, Zakir; Singh, Vinod Kumar; Singh, Ashutosh Kumar; Ayub, Shahanaz; E shaped Microstrip Antenna on Rogers substrate for WLAN applications Proc.IEEE,pp ,Oct [9] Shivnarayan and Babau R. Vishvakarma, Microstrip Patch Antenna with Inclined Slot for Dual-Band Operation, Electronic letters, Vol. 33, No. 22, February 2006, PP Page 158

6 [10] C.Y. Chiu, C.H. Chan and K.M. Luke, Study of slotted microstrip patch antennas with folded patch feed, Microwave Antennas propagation, vol. 152, No. 5, October [11] J. R. James and P. S. Hall, "Handbook of microstrip antennas," Peter Peregrinus Ltd, London, [12] Amit A. Deshmukh and K. P. Ray, Compact Broadband Slotted Rectangular Microstrip Antenna, IEEE antennas and wireless propagation letters, vol. 8, No. 3, March 2009, PP [13] Suwat Sakulchat, Amnoiy Ruengwaree Dual Band Microstrip Antenna with Rhombus Stub for WLAN Applications The 2009 International Symposium on Antennas and Propagation (ISAP 2009) October 20-23, 2009, Bangkok, Thailand. [14] W. Ren. Compact Dual-Band slot Antenna for 2.4/5GHZ WLAN Applications Progress In Electromagnetics Research B, Vol. 8, , Page 159