نتایج جستجو برای: ultra wide stopband
تعداد نتایج: 415967 فیلتر نتایج به سال:
Ultra wide band systems are used in wide variety of applications due to its resistance to severe multipath and jamming, low complexity and low cost. UWB finds extensive application in mobile handsets. Microstrip antennas are used in ultra wide band applications because of its low profile, high efficiency and economical fabrication features. In this paper, a comparative study of various antennas...
In this article, a novel structure of photonic crystal fiber with nearly zero ultra-flattened chromatic dispersion and ultra-low confinement loss is presented. By replacing the circular air-holes of two first rings with the elliptical air-holes, a fiber with outstanding features of chromatic dispersion and confinement loss is designed. The proposed structure is optimized for operating in a wide...
Time Hopping Ultra Wide Band (TH UWB) commonly encodes the data symbols by shifting the position of the transmitted pulses by a quantity that is quantized over the inter-pulse interval range. In this paper, we relax the hypothesis of a discrete value for the time shift introduced by the TH code, by considering the possibility of generating real-valued codes that introduce time hopping in a flui...
s. jiang · m. j. skibniewski · y. yuan · c. sun · ultra-wide band technology applications in ... · pp 207-213 Ultra-Wide Band; frequency range; receiver; tracking; sensing
Planar dielectric EBG structures are formed by two-dimensional periodic dielectric inclusions in the dielectric slab. The main design parameters forming the frequencies of stopband are the shape of inclusions and their size, kind of slab it is formed in, lattice constant and both slab and inclusions permittivity constant. While there does not exist a general way how to determine the stopband ex...
In this paper we examine the relation between signal-tonoise-ratio, oversampling ratio, transition bandwidth, and filter order for some commonly used sigma-delta-modulators and corresponding decimation filters. The decimation filters are equi-ripple finite impulse response filters and it is demonstrated that, for any given filter order, there exists an optimum choice of the stopband ripple and ...
In this letter, a packaged bandpass filter (BPF) with compact size of $1.5 \times 1.5 0.315$ mm 3 operating at 28 GHz is proposed. This BPF implemented based on multilayers printed...
In this paper, ultra-wideband bandpass filters using tapered transmission line resonators are presented. The proposed based on short-circuited stubs. use of resulted in a noticeable length reduction, wider controlled operational bandwidth, and better stopband characteristics for filter applications. Three designed with different ratios exponential resonators. other three also equivalent linear ...
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