Cross Dipole Hybrid Koch Fractal Antenna for Wireless Communication
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1 International Journal of Electronics Engineering Research. ISSN Volume 9, Number 3 (2017) pp Research India Publications Cross Dipole Hybrid Koch Fractal Antenna for Wireless Communication Navjot Kaur 1, Balwinder Kaur 2 and Jagtar Singh 3 1,2 COEM, Punjabi University Neighborhood Campus, Rampura Phul, Punjab, India 3 YCOE, Punjabi University Neighborhood Campus,Talwandi Sabbo, Punjab, India Abstract There are many techniques to improve the characteristics of antennas. This paper presents the analysis and designs a small size, low profile and dual band cross dipole hybrid antenna. The new designed antenna operates at three resonant frequencies of 700 MHz, 1060 MHz and 1360 MHz with acceptable bandwidth. Also the gain of the proposed antenna is calculated and described in the three planes XY-plane, XZ-plane and YZ- plane, where the antenna is placed in XZ-plane. Keywords- cross dipole hybrid antenna, Koch curve, and multiband antenna 1. INTRODUCTION Fractal antennas have entered the view of many as a very promising solution. Fractal antenna theory is a relatively new area. However, fractal antennas and its superset fractal electrodynamics is a state of affairs for research activity. Fractal antennas can be utilized in a variety of applications, especially where space is limited [1]. There are several types that have been proven by other researchers, i.e., some of the fractal types can be used to reduce the antenna size [2]. The term fractal means broken (fragmented), was coined less than twenty-five years ago by one of history s most creative mathematicians, Benoit Mandelbrot, whose seminal work, The Fractal Geometry of Nature [3]. In the mathematics, fractals are a class of complex geometric shapes commonly exhibit the property of self similarity, such that small portion of it can be viewed as a reduced scale replica of the whole. Fractals can be Corresponding Author
2 364 Navjot Kaur, Balwinder Kaur and Jagtar Singh either random or deterministic [4]. Fractal geometry is also combined with electromagnetic theory for the purpose of investigating a new class of radiation, propagation, and scattering problems, one such area is fractal electrodynamics [5-6]. Koch curve is a good example of self-similar space-filling fractals which have been used to develop wideband/multiband and/or miniaturized antennas. The features of the Koch geometry can overcome some of the limitation of small antennas. So in works, the fractal Koch geometry has been chosen due to its capabilities to reduce the size of the elements by applying different numbers of Iterations such as the 0th, 1st and series iteration [7]. The hybrid antenna has better results than the quadratic Koch dipole fractal antenna and triangular Koch dipole fractal antenna [8]. The cross dipole antenna based on the triangular and quadratic fractal Koch curve is also designed. This type of antenna has useful applications in communication systems. The gain of this cross dipole antenna is described in the three planes are XZ- plane, YZ- plane, XY- plane, where the antenna placed in the free space [9]. 2. PROPOSED ANTENNA DESIGN In this work, method of moment simulation code (NEC) is used to perform a detailed study of VSWR, reflection coefficient, and radiation pattern characteristics of the cross dipole hybrid Koch antenna in XZ-plane. The NEC is a computer code based on the method of moment for analyzing the electromagnetic response of an arbitrary structure consisting of wires or surfaces, such as Hilbert and Koch curves. The proposed antenna includes the replacement of each arm in the normal dipole crossed antenna in (Figure 1) with first-iteration Koch curve geometry. The vertical and horizontal arms in the normal dipole crossed antenna are replaced with hybrid Koch curve geometry. The antenna has been called hybrid which has a square Koch geometry on the upper half and triangular Koch geometry on the lower half. The proposed antenna is shown in (Figure 2). The proposed antenna is placed in XZ-plane with design frequency equal to 750 MHz. For the design frequency of 750 MHz, the design wavelength is 0.4 m (40 cm) then the length of the corresponding λ/2 dipole antenna length will be of 20 cm. Figure 1. Cross normal dipole antenna. Figure 2. Proposed hybrid cross dipole antenna
3 Cross Dipole Hybrid Koch Fractal Antenna for Wireless Communication SIMULATION RESULTS The reflection coefficient of the proposed antenna is shown in (Figure 4). It is found that the antenna has triple bands behavior at the resonance frequencies 700 MHz, 1060 MHz and 1360 MHz with reflection coefficient < -10 db. Figure 3. VSWR characteristics of hybrid cross Dipole antenna. Figure 4. Reflection coefficients at the antenna terminals. Table 1. VSWR, Reflection coefficient and Gain of the proposed antenna Frequency (MHz) VSWR Reflection Coefficient (db) XZ-plane (phi=0) Gain(dBi) YZ-plane (phi=90) XY-plane (theta=90)
4 366 Navjot Kaur, Balwinder Kaur and Jagtar Singh The radiation patterns at these resonant frequencies in the planes YZ-plane, XZ-plane, and XY-plane are depicted in (Figure 5-7), where the antenna is placed in the free space. XZ-plane YZ-plane XY-Plane Figure 5. Radiation patterns at 700 MHz in different planes. XZ-plane YZ-plane XY-Plane Figure 6. Radiation patterns at 1060 MHz in different planes. XZ-Plane YZ-Plane XY-Plane Figure 7. Radiation patterns at 1360 MHz in different planes.
5 Cross Dipole Hybrid Koch Fractal Antenna for Wireless Communication CONCLUSION In this work, the Cross Dipole Hybrid Koch Fractal Antenna based on a fractal first iteration has been presented. The simulation result shows that the proposed antenna can be used as multiband antenna. This proposed antenna operates at three resonant frequencies of 700 MHz, 1060 MHz and 1360 MHz with acceptable bandwidth. At these frequencies this antenna have VSWR<2 and reflection coefficient< 10dB. This proposed antenna is useful for wireless communication. REFERENCES [1] Cohen, N., Fractal antenna applications in wireless telecommunications, Professional Program Proc. of Electronics Industries Forum of New England, 1997, IEEE, 43-49, [2] Johnson, P., Fractal antenna design for RFID application, Mid-Sweden University, Department of Information Technology and Media, Electronic Design Division, [3] B. B. Mandelbrot, The Fractal Geometry of Nature, W.H. Freeman and company, New York, [4] X. Yang, J. Chiochetti, D. Papadopoulos and L. Susman, Fractal Antenna Elements and Arrays, Applied Microwave and Wireless, vol. 5, no. 11, pp , May [5] D. L. Jaggard, On Fractal Electrodynamics, in H. N. Kritikos and D. L. Jaggard (eds.), Recent Advances in Electromagnetic theory, New York, Springer-Verlag, 1990, pp [6] D. Kalra, Antenna Miniaturization Using Fractals, M.Sc. Thesis, University of Deemed, India, [7] Ramadan, A., K. Y. Kabalan, A. El-Hajj, S. Khoury, and M. Al- Husseini, A reconfigurable U-koch microstrip antenna for wireless applications, Progress In Electromagnetics Research, PIER 93, , [8] Nemanja Poprzen, Mićo Gacanovic, Fractal antennas: design, characteristics and analysis, Regular paper. [9] Carles Puente Baliarda, Jordi Romeu, and Angel Cardama, The Koch Monopole: A Small Fractal Antenna, IEEE Transactions on antennas and propagation, VOL. 48, NO. 11, November 2000.
6 368 Navjot Kaur, Balwinder Kaur and Jagtar Singh
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