We analyze the stop-band due to crab cavities for horizontal tunes that are either close to integers or close to half integers. The latter case is relevant for today’s electron/positron colliders. We compare this stop-band to that created by dispersion in an accelerating cavity and show that a single typical crab cavity creates larger stop-bands than a typical dispersion at an accelerating cavi...

Chiral 3D photonic crystals are an interesting subclass of 3D photonic crystals. For example, large complete 3D photonic bandgaps have been predicted for high-index-contrast silicon square-spiral structures; corresponding experiments using glancing-incidence deposition, interference lithography, or direct laser writing have been published. In addition to complete gaps or stop bands, theory also...

Interpolated band stop FIR filters are excluded. A block diagram of an interpolated filter for odd spectral regions is proposed. The use the proposed maximum allowable value coefficient in comparison with reference calculated by classical method, namely quantitative limitation to computing resource. For structure, relations obtained determine computational efficiency and increase number registe...

We demonstrate that, in contrast with the well-studied photonic crystals consisting of two homogeneous components, photonic crystals comprised of inhomogeneous or multiple (three or more) components may bring new opportunities to photonics due to the discovered quasiperiodic resonant behavior of their (hkl) stop bands as a function of the reciprocal lattice vector. A resonant stop band cannot b...

Colloidal suspensions of charged polystyrene microspheres can self-organize into colloidal crystals, providing a three-dimensional periodic dielectric medium suitable for the study of photonic band structure effects in the infrared, near-infrared, and visible wavelength regimes. Light propagation along any particular direction in such a system displays bands of frequencies for which the propaga...

Abstract—In this paper, a printed slot antenna fed by a co-planar waveguide for ultra wide bandwidth (UWB) with dual notch bands has been presented and discussed. The band notches are realized by etching one C-slot resonator inside a plaque shape exciting stub as well as symmetrically adding a pair of open-circuit stubs at the edge of the slot resulting in dual stop band filtering properties fo...

Phononic crystals (PCs) and metamaterials are artificially structured materials with the unprecedented property of existence complete stop-bands. However, generally narrow width stop-bands in such severely limits their applicability. Here, a particular kind gradient zigzag metamaterial beams exclusively flat bands within broad frequency range is proposed based upon our previously uniform counte...