A hexagonal‐shaped fractal antenna with triangular slot for super wideband (SWB) application is presented. The proposed antenna has total size of 20 × 33.4 × 1.57 mm3.The proposed antenna is designed of iterations of triangular slot on a hexagonal metallic patch with tapered microstrip line feed. A combination of semicircular and rectangular shaped partial ground plane is used to achieve a super wide bandwidth from 3 to 35 GHz with bandwidth ratio of 11.6:1. The antenna design, simulation and optimization are performed using IE3D Full Wave Electromagnetic Simulator. The proposed antenna is compact and has stable radiation pattern. The simulation and measured results are compared to demonstrate the performance of proposed antenna. © 2015 Wiley Periodicals, Inc. Microwave Opt Technol Lett 57:1659–1662, 2015

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the TSNU-PSTD uses only 35.6% of the computational space of its corresponding uniform version. For a more complicated geometry, the TSNU-PSTD may save more computational memory and time in comparison with the conventional PSTD. CONCLUSIONSIn this study, we have investigated the polynomial and cubic spline interpolations for an evaluation of the space transformation factors du/dx, dv/dy, and dw/dz, and applied the algorithms in to a wave propagation problem and a scattering analyses. We find that both the polynomial approach at degrees 2 through 4 and the cubic spline interpolation method yield results at a similar level of accuracy. Our simulations also confirm that computation errors occur for higher degree polynomial cases.

A novel coplanar waveguide fed UWB antenna with quad notch band characteristics has been proposed in this work. The antenna layout is designed based on a combination of well-known geometrical shapes: a half ellipse patch, rectangle, and triangle. The shape of the ground plane is partially tapered rectangular. The overall dimension of the antenna is 41.5 × 32 mm. The antenna uses three U-shaped slots at the top surface to create three notched band characteristics. A split-ring resonator is then introduced at the bottom surface of the antenna. With the integration of split-ring resonator at the bottom surface, an additional notch band at 7.25 to 7.75 (6.7%) GHz is created in the antenna. The designed antenna has an operating impedance bandwidth (VSWR ≤2) ranges from 3.03 to 12.34 GHz except in quad frequency stop bands of 3.3 to 3.7 (11.4%), 5.15 to 5.35 (3.8%), 5.725 to 5.825 (1.7%), and 7.25 to 7.75 (6.7%) GHz. The proposed antennas are successfully designed, prototyped, and measured. The simulated and measured results are extensively studied and discussed. Correlation between the time-domain transmitting antenna input signal and the received antenna output signal is calculated in order to ensure that the proposed antenna can be used in pulse-communication systems. This antenna finds applications in medical imaging, military radar systems, and other common UWB applications. K E Y W O R D SCPW-fed, quad notch, UWB