Wideband LNA using series RLC input matching and resistive feedback

Abstract

harmonic current source excited the antenna with the frequency set to 1.36 GHz. As seen in Figure 6, waveforms computed using the developed and direct FDTD methods overlap as long as the iteration is less than n s and a distance between the antenna and scatterer is sufficiently long.The developed method allows to limit the erroneous field leakage which appears when the radiation incompatible with the FDTD grid is injected across the TFSF interface. Although the error resulting from the unilateral coupling between the antenna and the scatterer decreases when the distance between these objects is increased, the dispersion error of the FDTD method increases as well. It has to be taken into consideration before applying the developed method for simulation of distant wire antennas and scatterers. CONCLUSIONThe application of the DGF-FDTD antenna simulations for excitation of the TFSF interface in the FDTD method was presented. It was verified that the DGF-FDTD solutions of antenna problems can be applied to introduce irradiation to the FDTD domain without the erroneous field leakage. The error resulting from the unilateral coupling between antenna and scatterer was demonstrated to be negligible for sufficiently long distance between these objects. Infinite DGF waveforms can be truncated using the Hann's window to speed up computations but this approximation introduces errors to the FDTD solution. The developed implementation facilitates the DGF applications in the FDTD simulations of radiation and scattering problems.