Abstract A two-sided frequency selective surface (FSS) is proposed to shield two bands of the mobile frequencies (EGSM-900 and DCS-1800). The FSS consists an array square concentric-rings cells printed on both sides substrate offer better shielding frequencies. CST Microwave suit used for simulations. equivalent circuit model analysed transmission in terms stop estimated. obtained than 40 dB ac...

We investigate the Hartman saturation effect of photons traveling through barriers created by stop bands of multilayer stacks. We provide a theoretical basis for the recently observed drastic changes in photon transversal times due to adding a single layer. Using a comprehensive coupled mode analysis and rigorous transfer matrix approach, we show that the experimentally observed effect is cause...

Photonic crystals (PCs) which are arrays of dielectric materials with a one, two, or three dimensional periodicity have attracted considerable attention during the past decade. PCs have been considered to be one of the most promising materials for manipulating light in three dimensional spaces for all optical signal processing and optical integration technology. Through numerous theoretical stu...

The design problem for filters attenuating signals with frequencies outside the useful (pass) bands can be in many cases reduced to the problem of designing low pass or band-stop filters with sufficiently large bandwidths. It follows from the fact that some elements of complex electronic systems, as for example the radiating elements of antenna arrays, have the characteristics similar to those ...

D. Paul, M. Zaitsev, J. Hennig Diagnostic Radiology Medical Physics, University Hospital, Freiburg, Germany Introduction Balanced steady state free precession sequences (b-SSFP; also known as TrueFISP, FIESTA, balanced FFE ...) are widely used in cardiac and abdominal imaging. They typically result in image contrast determined by T2/T1 [1]. In order to suppress signal oscillations from onand of...

This paper presents a theoretical analysis of the recently reported observation of acoustic stop bands in two-dimensional scattering arrays [Robertson and Rudy, J. Acoust. Soc. Am. 104, 694 (1998)]. A self-consistent wave scattering theory, incorporating all orders of multiple scattering, is used to obtain the wave transmission. The band structures for the regular arrays of cylinders are comput...

We derive the matrix that minimizes a quadratic criterion subject to linear equality constraints. Since we do not assume that the matrix of the quadratic form criterion is nonsingular, our optimization result is more general than those previously published. We make use of the extended result of this paper to (i) obtain the best linear unbiased estimate of the parameters in a linear regression w...

The paper presents a model of a chiral multi-structure incorporating gyro-elastic beams. Floquet-Bloch waves in periodic chiral systems are investigated in detail, with the emphasis on localization and the formation of standing waves. It is found that gyricity leads to low-frequency standing modes and generation of stop-bands. A design of an earthquake protection system is offered here, as an i...