# Koch Fractal Microstrip patch Antenna for Triband Wireless Applications

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2 II. DES IGN CONS IDERATION The proposed antenna can be design for three layer patch layer,substrate layer,ground layer. Firstly calculate width(w) and length(l) of the patch. next step is calculation of the ground plane then gruond plane and substrate plane dimention are same. Calcultion of the feeding point on the diagonalaxies because of the impedence matching purpose. For the design purpose dielectic material is used FR4 material of dielectric constant 4.4 its height is 1.6 mm In this design, iteration method is used. In first iteration simple microstrip patch antenna is design there is only one band of frequency occures,second iteration fractal at the boundary of microstrip patch antenna threre dual band of frequency obtained,in third iteration koch fractal slot is inserted at the centre of the patch there is triple band of frequency shown. To achieve the triple band of frequency and good circular polarazation rotate the inserted koch fractal slot some angle. The performance of the antenna is incresed by variation in the length of the koch curves. Thus, the ground-plane dimensions should also be taken into account in determining the proper parameters for the proposed design to achieve the desired band operation. figure1.geometry of koch fractal Antenna III. SIMULATED RES ULT AND DISCUSS ION The simulation of the koch fractal microstrip patch antenna is depends on the length,width,feeding point which is calculated using different formulea. calculated L and W used for designing microstip patch in HFSS software and result is achieves by the optimazation in design. The simulated result for Koch fractal Antenna is discussed as below. figure2. Simulation of Koch fractal Antenna 3.1. Return All rights Reserved 372

3 The return loss is a variable in which the power does not return in the form of reflection and is lost to the load. The designed antenna resonates at 1.52,2.04 and 2.43 GHz frequency. The return loss values is -11 db,-14 db,-28 db respectively. The plot for Return Loss is shown in below Figure 3. figure3. Return Loss of Koch fractal Antenna 3.2. VSWR The VSWR (voltage standing wave ratio) plot for the design antenna (coaxial feed) is shown in Figure 4. The value of VSW R is 1.74, at resonating frequency 1.52, 2.04 and 2.43 GHz respectively. A VSWR values is 1 means there is no loss in the transmission. The VSW R values is 2, 90% of the power is transmitted. figure4.vswr 3.3. Current distribution The Current distribution represents that how the current is distributed on the patch.the maximum current on the patch on the edeges of the patch. Red colour shows maximum current ditribution. We have to varing length current distribution All rights Reserved 373

4 figure5.current distribution 3.4. Radiation Pattern The antenna radiates more in a particular direction as shown in polar plot, as compared to the isotropic antenna which radiates equally in all directions. figure6.radiation Pattern IV. EFFECT OF DIFFERENT S TUCTURE The variation on the width and lenght of antenna corresponds to different types of MSA return loss and VSWR with different resonant frequency. The following table gives description of effect of antenna. S r n o T y p e o f M S A Fr e q ue nc y( GH z) Return Loss (db) V S W R 1 M ic r os tr ip A nte n n a F r a c t a l A n t e n n a F r a c t a l Boundary Antenna All rights Reserved 374

5 IV. CONCLUS ION A koch fractal microstrip patch antenna has been designed and simulated. The simulation result obtained by HFSS shows at resonating frequency. It is shown that the proposed antenna have return loss , and db for 1.52,2.04,2.43GHz respectively. The VSW R are 1.74,1.45,1.08 for 1.52,2.04 and 2.43 GHz resp. REFERENCES [1] Y. Sung, Dual-band circularly polarized pentagonal slot antenna, IEEE Antennas Wireless Propag. Lett., vol. 10, pp , [2] K. P. Yang and K. L. Wong, Dual-band circularly-polarized square microstrip antenna, IEEE Trans. Antennas Propag., vol. 49, no. 3, pp , [3] H. Zhai, Z. Ma, Y. Han, and C. Liang, A compact printed antenna for triple -band WLAN/WiMAX applications, IEEE Antennas Wire-less Propag. Lett., vol. 12, pp , [4] T.-H. Chang and J.-F. Kiang, Compact multi-band H-shaped slot an-tenna, IEEE Trans. Antennas Propag., vol. 61, no. 8, pp , Aug [5] W. C. Mok, S. H. Wong, K. M. Luk, and K. F. Lee, Single layer single patch dual band and triple band patch antennas, IEEE Trans. AntennasPropag., vol. 61, no. 8, pp , Aug [6] C. Puente, J. Romeu, R. Pous, and A. Cardama, On the behavior of the Sierpinski multiband antenna, IEEE Trans. Antennas Propag., vol. 46, no. 4, pp , Apr [7] K. J. Vinoy, J. K. Abraham, and V. K. Varadan, On the relationship be-tween fractal dimension and the performance of multi-resonant dipole antennas using Koch curves, IEEE Trans. Antennas Propag., vol. 51, no. 9, pp , Sep [8] C. Puente, J. Romeu, and A. Cardama, The Koch monopole: A small fractal antenna, IEEE Trans. Antennas Propag., vol. 48, no. 11, pp , Nov [9] X. D. Song, J. M. Fu, and W. Wang, Design of a miniaturized dual band Koch fractal boundary micro strip antenna, in Proc. IEEE Mi-crow. Conf., 2008, pp [10]P. H. Rao, Broadband CPW-fed planar Koch fractal loop antenna, IEEE Antennas Wireless Propag. Lett., vol. 7, pp , [11] D. D. Krishna, M. Gopikrishna, C. K. Aanandan, P. Mohanan, and K. Vasudevan, CPW-fed Koch fractal slot antenna for WLAN/WiMAX applications, IEEE Antennas Wireless Propag. Lett., vol. 7, pp , [12] D. D. Krishna, M. Gopikrishna, C. K. Aanandan, P. Mohanan, and K. Vasudevan, Compact wide band Koch fracta l printed slot antenna, Microw., Antennas Propag., vol. 3, no. 5, pp , [13] V. V. Reddy and N. V. S. N. Sarma, Compact circularly polarized asymmetrical fractal boundary microstrip antenna for wireless appli-cations, IEEE Antennas Wireless Propag. Lett., vol. 13, pp , All rights Reserved 375

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