Defect modes in microstrip lines on electromagnetic band-gap substrates of finite extent

Abstract

generate a sufficiently long time response for accurate frequencydomain parameter estimation. The results show that the PSO can efficiently obtain the optimal hyperparameter value needed in the LS-SVM algorithm. Also, the PSO_LS-SVM method can greatly reduce the CPU time as compared to the direct FDTD method. In the future, the PSO_LS-SVM will be widely used in computational electromagnetics.

A Study of Periodic Microstrip Structures Using Finite Elementary Lines (FEL) Approach

“…There is a perfect agreement between the results obtained by the FEL approach and measurements of [9] and those of [10].…”

“…For the structure of [10], a perfect agreement between the center frequency of the measured first rejection band and the simulated by the FEL model which is equal to 8.5 GHz is obtained. The measured and simulated depth is -22 dB.…”

“…In this section, the FEL model is compared to that of [10]. The studied structure is schematically shown in Figure 5.…”

“…The number of cells is 5. On the figures 6 (a) and 6 (b) are presented the Sparameters of the structure of Figure 5, measured and simulated by [10] with the software HFSS (High Frequency Structure Simulator). The S-parameters of the structure simulated by the FEL are shown in Figure 7.…”

“…To investigate the influence of both ρ w contrast (ratio between the maximum and minimum widths of microstrip w max / w min ) and ρ εr contrast (ρ εr = ε rmax / ε rmin ) on depth and width at -20 dB of the rejection band, the structure of [9] is taken and it is combined with the structure of [10] to form a hybrid periodic structure, as shown in Figure 8. In Figure 9 is displayed the characteristic impedance of a hybrid periodic structure.…”