Comprehensive Design, Simulation, Fabrication, and Experimental Evaluation of an Ultra-Wideband Antenna Incorporating a Gain Optimization Strategy
الموضوعات : Telecommunication
1 - Department of Electrical Engineering, Se.C., Islamic Azad University, Semnan, Iran
الکلمات المفتاحية: Wideband antenna, single-frequency gain, optimal impedance matching, gradient optimization,
ملخص المقالة :
In this paper, we present the design and optimization of an ultra-wideband (UWB) antenna operating over the frequency range of 300 to 3000 MHz. Our design approach is to develop a UWB antenna that, first, provides proper impedance matching across the specified frequency band, and second, exhibits uniform on-axis gain and gain stability over adjacent angles within the frequency range of 900 to 2200 MHz.The antenna is analyzed and simulated using CST, and the feedback obtained from each analysis iteration is fed into the optimization module, which has been implemented in MATLAB.The physical structure of the antenna resembles a V-shaped antenna with planar arms, in which the slope of each arm is defined symmetrically and in a segmented manner, with each segment assigned a distinct value. After each analysis step, the arm slopes are updated through an optimization process using a gradient-based method with a direct-search approach, such that both adequate impedance matching is achieved and the antenna’s on-axis gain—the primary design metric—remains as uniform as possible throughout the 900–2200 MHz frequency range.
Also, considering the balanced nature of the antenna arms and the unbalanced nature of the coaxial cable, an arrangement was adopted to establish optimal connection between the antenna input and the pulse generator output.
[1] Merril 1. skolnik, "Introduction to Radar systems", McGraw-Hill book company, 1981, Singapore, p420-421.
[2] Joël Andrieu, Séverine Nouvet, Valérie Bertrand, Bruno Beillard, and Bernard Jecko. "Transient Characterization of a Novel Ultrawide-Band Antenna: The Scissors Antenna", IEEE transactions on antennas and propagation, April 2005, vol. 53, no. 4,p1256 & 1260
and [3] J.-C. Diot, P. Delmote, J. Andrieu, M. Lalande, V. Bertrand, B. Jecko, S. Colson, R. Guillerey, and M. Brishoual," A Novel Antenna for Transient Applications in the Frequency Band 300 MHz 3 GHz: The Valentine Antenna", IEEE transactions on antennas propagation, march 2007, vol. 55, no. 3,p987-990.
[4] Laurent Desrumaux, Adrien Godard, Michèle Lalande," An Original Antenna for Transient High Power UWB Arrays: The Shark Antenna", IEEE transactions on antennas and propagation, august 2010,vol. 58, no. 8p2519..
[5] B. Cadilhon L.Pe castaing, S. Vauchamp J. Andrieu V. Bertrand, M. Lalande," Improvement of an ultra-wideband antenna for high-power transient applications", Published in IET Microwaves Antennas & Propagation, July 2008, vol 3,1ss. 7, p 1102-1109.
[6] Constantine A. Balanis, "Antenna theory analysis and design", A john Wiley & sons, inc. publication, 2005, New Jersey,.
[7] Emo Todorov," Numerical Optimization", Applied Mathematics and Computer Science & Engineering, 2010, Chapter10, travelling wave and broadband Antenna.
[8] Jorge Nokedal, Stephen J. Wrigth, "Numerical optimization", 2end edition, 2000, Springer publication.
[9] Foster P.R., Tun S.M.,"A wideband balun from coaxial line to TEM line". Proc. IEE Conf. Antennas and Propagation, 1995, pp. 286-290
[10] A. Godard, V. Bertrand, J. Andrieu, M. and other, "Size reduction and radiation optimization on UWB antenna", IEEE transactions on antennas and propagation 2008.
[11] A. Godard, L. Desrumaux, V. Bertrand, and others, "A Transient UWB Antenna Array Used with Complex Impedance Surfaces", Hindawi Publishing Corporation International Journal of Antennas and Propagation, 2010, Volume2010, Article ID 243145, 8 pages.
[12] Antenna standard committee of the IEEE Antenna and propagation Group, "IEEE Standard definitions of terms of antenna", IEEE Std Board, 1983, New York.
[13] Ramesh Garg, "Analytical and computational methods in electromagnetic", Artech House INC.2008, Boston/London.
[14] David M. Pozar, "Microwave engineering", A john Wiley& sons, inc. publication, 1998, New Jersey.
[15] David Puente, Juan Ignacio Sancho and others." Ultra wide Band Antenna Design and applications", World scientific publishing Co.,2011, London.
