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    • International Journal of Electronics and Communication Engineering & Technology (IJECET), ISSN 0976 – 6464(Print), ISSN 0976 – 6472(Online), Volume 5, Issue 5, May (2014), pp. 43-47 © IAEME 43 DUAL BAND NOTCHED UWB ANTENNA WITH A T-SHAPED PARASITIC STRIP AND A DEFECTED GROUND PLANE Priya Shukla1 , Aman Verma1 , Vidhushi1 , Neha1 1 B.Tech Student, Electronics and Communication Dept., MIT, Meerut, (U.P), INDIA Kuldeep Singh Naruka2 2 Assistant Professor, Electronics and Communication Dept., MIT, Meerut, (U.P), INDIA ABSTRACT This paper presents a small microstrip-fed monopole antenna. The purpose of this antenna is used to prevent interference problems due to the existing nearby communication systems within an UWB operating frequency. The band-notches are realized by adding an independent controllable strip as well as using a hook- shaped defected ground structure (DGS) in the ground plane, and band rejected filtering properties in the WiMAX/WLAN are achieved. Simulated results show that the designed antenna, with a compact size of 24 x 26 x 0.8 mm3, has an impedance bandwidth of 2.9-14 GHz for VSWR less than 2, except two frequency stop-bands of 3-4 GHz and 5.1-5.6 GHz. The antenna is successfully designed and simulated. Index Terms: T-Shaped Parasitic Strip, Defected Ground Plane, Printed Square Monopole Antenna, ultrawideband (UWB). 1. INTRODUCTION Commercial ultrawideband (UWB) systems require small low-cost antennas with omnidirectional radiation patterns and large bandwidth [1]. It is a well-known fact that planar monopole antennas present really appealing physical features such as simple structure, small size, and low cost. Due to all these interesting characteristics, planar monopoles are extremely attractive to be used in emerging UWB applications and growing research activity is being focused on them. In UWB communication systems, one of key issues is the design of a compact antenna while providing wide band characteristic over the whole operating band. Consequently, a number of planar monopoles with different geometries have been experimentally characterized [2]–[4], and automatic design methods have been developed to achieve the optimum planar shape [5], [6]. In [7] and [8], two new small wideband planar monopole antennas with truncated ground plane using INTERNATIONAL JOURNAL OF ELECTRONICS AND COMMUNICATION ENGINEERING & TECHNOLOGY (IJECET) ISSN 0976 – 6464(Print) ISSN 0976 – 6472(Online) Volume 5, Issue 5, May (2014), pp. 43-47 © IAEME: www.iaeme.com/ijecet.asp Journal Impact Factor (2014): 7.2836 (Calculated by GISI) www.jifactor.com IJECET © I A E M E
    • International Journal of Electronics and Communication Engineering & Technology (IJECET), ISSN 0976 – 6464(Print), ISSN 0976 – 6472(Online), Volume 5, Issue 5, May (2014), pp. 43-47 © IAEME 44 an L-shaped notch in the lower corner to achieve the maximum impedance bandwidth were proposed. Moreover, other strategies to improve the impedance bandwidth that do not involve a modification of the geometry of the planar antenna have been investigated [9], [10]. This letter focuses on a square monopole antenna for UWB applications, which combines the circular-patch approach with an elliptical slot in circular patch and by adding T-shaped parasitic strip in bottom layer and hook shaped slot in defected ground structure achieves two band notch. By attaching a parasitic strip to the bottom layer of the antenna, a notched band of WLAN is achieved. To realize another rejected band of WiMAX, pair of hook-shaped slots are etched on the ground to form a defected ground plane. It is observed from the simulated results that the designed antenna exhibits two stop-bands of 3-4 GHz and 5.1-5.6 GHz, while maintaining wideband performance from 2 GHz to over 14 GHz for VSWR < 2, covering the entire UWB frequency band. In addition, the proposed antenna has a small size planar structure (24 × 26 × 0.8 mm3) and an omnidirectional pattern across the whole operating band. Fig. 1: Geometry of proposed antenna
    • International Journal of Electronics and Communication Engineering & Technology (IJECET), ISSN 0976 – 6464(Print), ISSN 0976 – 6472(Online), Volume 5, Issue 5, May (2014), pp. 43-47 © IAEME 45 Fig. 2: Simulated VSWR characteristics of the proposed antenna Fig. 3: Simulated return loss characteristics of the proposed antenna. 2. ANTENNA DESIGN Fig. 1 shows the configuration of the proposed wideband antenna which consists of a circular patch with elliptical slot and a defected ground structure with hook shaped slots and a T- shaped parasitic strip in bottom layer. The proposed antenna, which has compact dimension of 24 mm × 26 mm (Lsub × Wsub), is constructed on R04003 substrate with thickness of 0.8 mm and relative dielectric constant of 3.38. The basic antenna structure consists of a square patch, a feed line and defected ground plane. The square patch has a width W. The patch is connected to a feed line of width W5 and length L6, as shown in Fig. 1. On the other side of the substrate, a conducting ground plane of width W and length Lgnd is placed. The ground plane with hook shaped slots plays an important role in the broad-band characteristics of this antenna because it helps match the patch with the feed line in a wide range of frequencies. To notch the frequency band of WLAN, we use a T-shaped parasitic strip in bottom layer and to notch the WiMAX band two hook-shaped slots in the ground plane is used. The optimal dimensions of the designed antenna are as follows: W = 24 mm, L = 26 mm, W1 = 5 mm, W2 = 1 mm, W3 = 5 mm, W4 = 2.5 mm, W5 = 2 mm, L1 = 1.5 mm, L2 = 9 mm, L3 = 2 mm, L4 = 3 mm, L5 = 0.4 mm, L6 = 7 mm and Lgnd = 8.5 mm.
    • International Journal of Electronics and Communication Engineering & Technology (IJECET), ISSN 0976 – 6464(Print), ISSN 0976 – 6472(Online), Volume 5, Issue 5, May (2014), pp. 43-47 © IAEME 46 3. RESULTS AND DISCUSSIONS In this section, the microstrip patch antenna with various design parameters is constructed, and the numerical and experimental results of the input impedance and radiation characteristics are presented and discussed. The parameters of this proposed antenna are studied by changing one parameter at a time and fixing the others. The simulated results are obtained using Ansoft simulation software high-frequency structure simulator (HFSS) [11]. Firstly, the Fig. 3 shows the simulated VSWR characteristics. As shown in Fig. 2 there are two notch bands of 3-4 GHz and 5.1-5.6 GHz. Fig. 2, shows the simulated return loss characteristics of the proposed antenna. 4. CONCLUSION In this paper, a novel, compact printed monopole antenna has been proposed for UWB application. The simulated antenna satisfies the 10-dB return loss requirement from 2 to 11 GHz. Two band notch of WLAN and WiMax are achieved. ACKNOWLEDGMENT The author thanks to Director & colleagues of Electronics and Communication Department of Meerut Institute of Technology, Meerut, Uttar Pradesh, India for their support and Encouragements. REFERENCES [1] H. Schantz, The Art and Science of Ultra Wideband Antennas. Norwood, MA: Artech House, 2005. [2] M. J. Ammann, “Impedance bandwidth of the square planar monopole,” Microw. Opt. Technol. Lett., vol. 24, no. 3, pp. 185–187, Feb. 2000. [3] J. A. Evansand M. J. Ammann, “Planartrapezoidal and pentagonal monopoles with impedance bandwidths in excess of 10:1,” in Proc. IEEE Antennas Propag. Soc. Int. Symp., Jul. 1999, vol. 3, pp. 1558–1561. [4] Z. N. Chen, “Impedance characteristics of planar bow-tie-like monopole antennas,” Electron. Lett., vol. 36, no. 13, pp. 1100–1101, Jun.2000. [5] S. Y. Suh, W. L. Stutzman, and W. A. Davis, “A new ultrawideband printed monopole antenna: The planar inverted cone antenna (PICA),” IEEE Trans. Antennas Propag., vol. 52, no. 5, pp. 1361–1364, May 2004. [6] A. J. Kerkhoff , R. L. Rogers, and H. Ling, “Design and analysis of planar monopole antennas using a genetic algorithm approach,” IEEE Trans. Antennas Propag., vol. 52, no. 6, pp. 1768–1771, Jun 2004. [7] J. Jung, W. Choi and J. Choi, “A small wideband microstrip-fed monopole antenna,” IEEE Microw. Wireless Compon. Lett., vol. 15, no. 10, pp. 703–705, Oct. 2005. [8] J. Jung, W. Choi, and J. Choi, “A compact broadband antenna with an L-shaped notch,” IEICE Trans. Commun., vol. E 89-B, no. 6, pp. 1968–1971, Jun. 2006. [9] M. J. Ammann, “Wideband antenna for mobile wireless terminals,” Microw. Opt. Technol. Lett., vol. 26, no. 6, Sep. 2000. [10] E. Antonino-Daviu, M. Cabedo-Fabres, M. Ferrando-Bataller, and A. Valero-Nogueira, “Wideband double-fed planar monopole antennas,” Electron. Lett. vol. 39, no. 23, pp. 1635–1636, Nov. 2003. [11] Ansoft High Frequency Structure Simulation (HFSS). ver. 10, an soft Corp., 2005.
    • International Journal of Electronics and Communication Engineering & Technology (IJECET), ISSN 0976 – 6464(Print), ISSN 0976 – 6472(Online), Volume 5, Issue 5, May (2014), pp. 43-47 © IAEME 47 [12] Neha, Priya Shukla, Aman Verma, Vidhushi and Kuldeep Singh Naruka, “Band Notched Microstrip-Fed Monopole Antenna for UWB Application” International Journal of Advanced Research in Engineering & Technology (IJARET), Volume 5, Issue 3, 2014, pp. 108 - 114, ISSN Print: 0976-6480, ISSN Online: 0976-6499. [13] Archana Agarwal, Manish Kumar, Priyanka Jain and Shagun Maheshwari, “Tapered Circular Microstrip Antenna with Modified Ground Plane for UWB Communications”, International Journal of Electronics and Communication Engineering & Technology (IJECET), Volume 4, Issue 3, 2013, pp. 43 - 47, ISSN Print: 0976- 6464, ISSN Online: 0976 –6472. [14] Km. Vidushi, Priya Shukla, Neha, Aman Verma and Kuldeep Singh Naruka, “Square Monopole Antenna with Two L-Shaped Slots in the Patch for UWB Application”, International Journal of Electronics and Communication Engineering & Technology (IJECET), Volume 5, Issue 2, 2013, pp. 69 - 74, ISSN Print: 0976- 6464, ISSN Online: 0976 –6472. AUTHORS DETAILS Priya Shukla was born in Kanpur, Uttar Pradesh, India on 19th Oct. 1992. She is pursuing B.Tech (ECE) from Meerut Institute of Technology, Meerut affiliated to UPTU, Lucknow. Aman Verma was born in Mainpuri, Uttar Pradesh, India on 14th Feb 1993. He is pursuing B.Tech (ECE) from Meerut Institute of Technology, Meerut affiliated to UPTU, Lucknow. Vidushi was born in Meerut, Uttar Pradesh, India on 29th Dec. 1993. She is pursuing B.Tech (ECE) from Meerut Institute of Technology; Meerut affiliated to UPTU, Lucknow. Neha was born in Najibabad, Uttar Pradesh, India on 6th Feb 1994. She is pursuing B.Tech (ECE) from Meerut Institute of Technology; Meerut affiliated to UPTU, Lucknow. Kuldeep Singh Naruka was born in Jodhpur, Rajashtan, India on 1st July 1985. He obtained B.Tech from UPTU, Lucknow, M.Tech from SVSU, Meerut. He joined as a lecturer in the Dept. of ECE in Meerut Institute of Technology, Meerut in 2009. He is at present working as Asst. Prof. in the same Dept. His area of interest is RF and Microwave Engineering. He got Six years of teaching experience. He has published five research papers in International Journals and Conferences till this date.