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A novel design of a new passive tag RFID for railway application is presented. The proposed tag is based on multi-section narrow-band absorbing tiles. Based on absorbing resonance frequencies, different digits of the proposed RFID system are obtained. Thus the presence of an absorbing tile with specific resonance frequency corresponds to ‘1’ at the corresponding digit while replacing this tile with...
Carbon nanotube transmission line is characterized by slow wave velocity which can be considered as an important feature in size reduction of microwave circuits. However, equivalent characteristic impedance and Ohmic contacts of single carbon nanotube are much higher than the usual impedance values that are used in antennas and microwave circuits. This paper introduces the basic theory of parallel...
Green's function for a point source above a two-dimensional periodic boundary is presented in spectral form based on the zero term only of the infinite scattering Floquet modes. This formulation is applied to obtain the Dyadic Green's function of a printed source above a dielectric slab with periodically defected ground plane by using a generalized equivalent network of this defected ground plane...
This paper is devoted to model the propagation of ultra-short pulse in optical fiber. This modeling is achieved by using finite difference time domain of bodies of revolution BOR-FDTD technique. In the proposed modeling, the nonlinear effects and the dispersion are taken into account. These nonlinear effects include the self phase modulation (SPM) and the Stimulated Raman Scattering (SRS). The FDTD...
In this paper, bodies of revolution finite difference time domain (BOR-FDTD) combined with direct integration method are used to model cylindrical fiber bragg grating (FBG) and distributed bragg resonator (DBR) composed of linear and non-linear layers. The non-linear properties in this paper are mainly based on self phase modulation (SPM). It is shown that the nonlinear effect provides an additional...
A compact ultra-wideband (UWB) antenna with band-notch characteristic of size 28 mm times 29 mm is proposed. This antenna is designed to cover the Federal Communication Commission (FCC) bandwidth for UWB applications (3.1-10.6 GHz) and have a notch- filtering at the IEEE 802.1 Ia frequency band (5.15-5.825 GHz). This notch-filter effect is obtained by introducing a resonant U-shaped slot at this frequency...
In this paper, a quasi-static technique based on a simple transmission line model is used for studying a planar artificial magnetic conductor (AMC) surface. The results of this quasi-static model are verified with previously published results. This quasi-static solution is used as a fast efficient technique to obtain the effects of the different parameters on the center frequency and the operating...
This paper presents simple formulas for designing two dimensional photonic band gap (PBG) structures for different configurations. These formulas are obtained by interpolating full wave analysis based on the plane wave expansion method. The design parameters of these formulas include the physical dimensions of the unit cell and the electrical properties of both host and inclusion in the structure...
Fast and efficient vectorial modal analysis of a 2-D magneto-dielectric grating structure is presented. This modal analysis is combined with the generalized scattering matrix to obtain the transmission and reflection coefficients of multilayered 2-D magneto-dielectric grating slabs. The accuracy of this technique is verified with previously published results obtained by using method of moment
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