A novel compact ultrawideband planar antenna fed by a microstrip line is proposed. The proposed antenna consists of a rectangular patch and a defected ground plane with a semicircular notch and two stubs. The modified ground plane is used to achieve the wide impedance bandwidth. The measured results show that the antenna has a bandwidth 2.1–2.6 GHz and 3.3–20 GHz for S11 < −10 dB. The proposed antenna exhibits the omnidirectional radiation patterns and appreciable gain across the operating band. © 2012 Wiley Periodicals, Inc. Microwave Opt Technol Lett 55:86–89, 2013; View this article online at wileyonlinelibrary.com. DOI 10.1002/mop.27263

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Parallel com p utation is an effective way to solve lar g e-scale electroma g netic problems which can p rovide enou g h com p uter memory and reduce the computing time. In this paper the program of the p arallel Finite Difference Time Domain (FDTD) based on the JASMIN framework is p ro p osed. The p arallel FDTD p ro g ram was used for simulatin g the electric di p ole source and a rid g ed TEM horn antenna. The obtained parallel efficiency was as high as 80% even when 128 computers were employed. Numerical results show that the p ro g ram is correct and efficient. A lar g e-scale array of rid g ed TEM horn antenna was simulated. Its near-field and far-field results were g iven. The example p rovides a solution for studyin g large-scale antenna array and shows that the program has the ability to solve large-scale electroma g netic p roblems.Index Terms-FDTD, Parallel, JASMIN framework, Rid g ed TEM horn antenna array.

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