realized miniaturization compared with its counterparts. Moreover, the design procedure of this filter is quite simple while the filters in Refs. [6, 7] and [9] used the defected ground or slot line structures on the bottom side of the substrate, which suffer from the complexity and difficulties in integrating with other circuits or front-end systems. CONCLUSIONSTwo samples of the notch-band UWB BPFs based on interdigital-coupled feed-line structure have been designed and fabricated in this article. The simple five interdigital highimpedance lines are implemented to introduce a notched band within the filter's passband responses, which enable the rejection of interference signals at 5.8 GHz from WLAN systems and 8 GHz from satellite-communication systems, respectively. Owing to the compact size and super simple design procedure, the proposed filters are attractive for use in UWB wireless systems.ACKNOWLEDGMENT ABSTRACT: In this article, we have been investigated the use of frequency selective surfaces (FSS) with multifractal geometry. The proposed structure is a junction of the Koch curve with Sierpinski Carpet. The main advantage of the proposed structure is to design multiband FSS makes it flexible in terms of controlling resonance and bandwidth.

In this article, the authors propose the use of Cantor dust fractal geometry design frequency selective surfaces (FSS) with wideband, angular, and polarization independent operation aiming ultrawide band (UWB) applications. The simulated results were obtained with the computer program Ansoft Designer™. A prototype of the designed FSS was built and its transmission characteristics were measured for vertical and horizontal polarization. A good agreement between simulated and measured results was obtained. The FSS was stable angularly and in terms of polarization and proved to be useful for UWB applications. © 2015 Wiley Periodicals, Inc. Microwave Opt Technol Lett 57:216–219, 2015

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