Title :
Evolutionary optimization of zig-zag antennas using Gaussian and multiquadric radial basis functions
Author :
Zhao, Shifu ; Fumeaux, Christophe ; Coleman, Chris
Author_Institution :
Sch. of Electr. & Electron. Eng., Univ. of Adelaide, Adelaide, SA, Australia
Abstract :
Zig-Zag monopole antennas are frequently used and are of great importance in HF and VHF communications. Their shapes provide addition of wire length and thus contribute to inductive loading. Structural variations of the zig-zag shape are explored in this paper to change the distribution of inductance along the monopole height and thus improve the antenna performance. These variations are represented using radial basis functions to lower the number of variables in the optimization process. Evolutionary optimizers are applied to obtain the optimal shape variations based on electromagnetic simulations. The performance is considered with respect to bandwidth and radiation efficiency with a matching network tuned at the target frequency. Prototypes of the optimized zig-zag antennas are fabricated, measured and compared to a uniform zig-zag monopole. Experiments indicate a good agreement to the optimal simulation results.
Keywords :
Gaussian processes; HF antennas; VHF antennas; evolutionary computation; inductance; monopole antennas; optimisation; radial basis function networks; Gaussian functions; HF communications; VHF communications; antenna performance; bandwidth efficiency; electromagnetic simulations; evolutionary optimization; inductance distribution; inductive loading; matching network; monopole height; multiquadric radial basis functions; optimal shape variations; radiation efficiency; wire length; zig-zag monopole antennas; zig-zag shape; Antenna measurements; Bandwidth; Helical antennas; Optimization; Shape; MATNEC; Zig-zag antenna; evolutionary optimizations; multiquadric; radial basis function;
Conference_Titel :
Microwave Conference Proceedings (APMC), 2011 Asia-Pacific
Conference_Location :
Melbourne, VIC
Print_ISBN :
978-1-4577-2034-5