A compact UWB slot antenna optimized by genetic algorithm

Abstract

A compact ultra-wideband (UWB) slot antenna based on a mesh-grid structure is designed. A genetic algorithm is used to optimize the mesh-grid structure as well as other parameters of the proposed antenna for good impedance matching in the UWB band. The optimized UWB antenna has a compact size of 24 mm  30 mm and is fabricated and measured. According to the measured results, the proposed antenna yields a wide bandwidth, defined by VSWR<2, ranging from 3.1 to 12.2 GHz and a nearly omnidirectional radiation pattern in the H-plane. The antenna gains within the matching band are measured and a gain variation from 3.1 to 5.9 dBi is obtained. Figure 5 Simulated and measured gain for the proposed antenna with and without an arrow patchABSTRACT: A procedure is described to enhance the accuracy of microwave measurements of the complex permittivity of a dissipative medium. Monopole probe measurements are used in conjunction with two real-valued neural networks, which are integrated together to reconstruct the complex permittivity from the measured reflection coefficients. The approach is tested over the frequency range from 2.5 to 5 GHz, for the real part of the permittivity in the range 3-10 and the imaginary part in the range 0-0.5. The performance of the network is also demonstrated for a reduced frequency range from 3.5 to 5 GHz. Less than 4% error was observed in the presence of white Gaussian noise with an SNR of 10dB.

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Parallel Rectangular Open Slots Structure in Multiband Printed Antenna Design

“…To facilitate the antenna design process, the DE algorithms have been applied to several antenna design problems [15]- [17]. The present work, employing DE algorithm made available through IE3D [18], [19] is adopted to optimize our designs.…”