A novel multi-band band-reject filter based on multi-ring complementary split-ring resonators (multi-ring CSRRs) is presented. The proposed filter is realized by etching the multi-ring CSRRs in the ground plane beneath a microstrip line. The multi-ring CSRR offers the possibility of designing multi-band filters with a small size and simple structure. To validate the proposed prototype of the multi-band filter, a dual-band and tri-band filters were fabricated and tested. The proposed filters show a good multi-band property to satisfy the requirement of WLAN in the 2.4/5.8 GHz bands and WiMAX in the 2.5/3.4 GHz bands. A good agreement between experimental and simulated results is obtained.

No abstract

Permeability function and magnetic loss tangent of a medium composed of artificial magnetic material inclusions can be expressed in terms of the perimeter and area of an inclusion. This expression of the inclusion's magnetic response in terms of the geometric properties simplifies and facilitates the design process of the inclusion. Such new inclusion's circuit model creates flexibility and allows to the designer to achieve a specific constraints without the use of the intensive full wave electromagnetic simulation. In this paper, we apply a generalized model of the resonant behavior of an inclusion to study the nth order rose curve resonator (n-RCR) electromagnetic response. This study is based on a numerical and analytical simulation. A detailed parametric study on the transmission characteristics and the magnetic behavior of the n-RCR based on its physical and geometrical parameter is presented. The studied geometrical parameters are the perimeter, the area and the order of the rose curve resonator. Moreover, the width and the height of the printed conductor are defined as the principle physical parameters that will be analysed and investigated. Nth Rose curve resonator is a novel curve, considered as a generic candidate for the artificial magnetic materials and provides new characteristics not found in traditional resonators.

No abstract

The single-mode optical fiber used currently in communication systems starts showing many limitations especially for the high rates. Several physical phenomena related to the optical propagation are the cause of these limitations. The use of photonic crystal fibers (PCF) makes it possible to control most of these phenomena. In this paper, a multicriteria method is used for the design of the photonic crystal fiber with the user-defined optical proprieties. This method combines the deductive and the inductive learning and it is introduced for the first time in the field of optical fibers. This multicriteria method proves to be a powerful tool for the PCF fibers design.