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In this paper, an adaptive frequency sampling technique is applied to the moment method for the analysis of microstrip filters and patch antennae. The analysis of microstrip low-pass filter and patch antenna in the frequency domain has been usually done with uniform frequency step. An adaptive frequency sampling technique can significantly reduce the time taken for the analysis through the frequency...
Since the DC power-bus resonance is attributed to the PCB's radiated emission(RE) noise, this paper investigates the RE from the power-bus with regard to its resonance modes. A fast single-sum is suggested to calculate the impedance and radiated electric fields and is validated by physics and an EM analysis tool
Shape optimization of high voltage direct current (HVDC) joint using shape design sensitivity analysis considering nonlinear conductivity is presented in this paper. The electric field distribution of HVDC devices is a resistive field. Also, the nonlinear conductivity is expressed in terms of the temperature and electric field distribution. In this paper, the shape design sensitivity formula is derived,...
In this paper, an automatic mesh generation algorithm is presented. The method seeks to optimize mesh density with regard to geometries exhibiting both fine and coarse physical structures. Additionally, when generating the mesh, the algorithm attempts to simultaneously satisfy the limiting conditions of maximum mesh spacing and maximum grading ratio
In this paper, a non-uniform finite-difference time-domain (FDTD) method is incorporated with a design-sensitivity optimization technique to design a harmonic rejection microstrip low-pass filter (LPF) with defected ground. The proposed LPF features a defected ground plane to obtain high impedance on the microstrip line and perform a broad harmonic rejection. The design process initializes with the...
A method to determine functional relationships between the variable physical dimensions of an antenna and the antenna performance characteristics is presented. By applying multi-expression programming to this data set, optimization with regard to a given criteria can be subsequently performed on the functions instead of performing repeated electromagnetic simulations
In this paper, we present a design procedure of comb-line bandpass filter with asymmetrical coupled-lines, which has small size in comparison with other planar type filters to take full advantage of reducing the size of RF and microwave components. Based on a parallel coupled-line theory, we develop admittance inverter model for each asymmetric coupled-line pair. By combining equivalent circuits of...
In this paper, an optimal design of novel microstrip directional coupler with a grooved housing for high directivity characteristic is presented. It will be shown that the high directivity of the microstrip coupler can be achieved simply by attaching an optimized housing structure over the microstrip, which is much easier to fabricate than other conventional ones. The dimensions of the proposed structure...
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