Abstract-A method is proposed for analysis of arbitrarily loaded lossy and dispersive nonuniform single or coupled transmission lines. In this method, the transmission lines are subdivided to several uniform sections, at first. Then the voltage and current distributions are obtained using second order step-by-step numerical integration (second order finite difference method). The accuracy of the method is studied using analysis of some special types of single and coupled transmission lines.
A procedure is presented to synthesize linear and planar antenna arrays to have individually arbitrary sidelobe levels. This procedure is based on perturbation of the zeros of radiation pattern and is applicable for both sum‐ and difference‐type radiation patterns. Planar antenna arrays are synthesized by transforming synthesized linear arrays to planar arrays. The synthesized planar arrays would have ring type sidelobes. Some examples are brought to verify the effectiveness of the proposed procedure for both linear and planar arrays with sum or difference radiation patterns.
A general method is introduced to frequency domain analysis of arbitrary lossy inhomogeneous planar layers. In this method, all electric and magnetic parameters and also all components of the electric and magnetic fields are expanded in a Taylor's series. The field solutions are obtained after finding unknown coefficients of the series. The validity of the method is verified using analysis of some special types of planar layers.Index Terms-Inhomogeneous planar layers (IPL), lossy and dispersive, Taylor's series expansion.
Abstract-In this paper, a compact waveguide bandpass filter is proposed. The proposed structure consists of some inductive diaphragms in a rectangular waveguide and the regions between them have been filled fully by dielectrics. The relations between the physical and electrical parameters of the existed asymmetrical impedance invertors are obtained. The usefulness of the proposed structure and its performance are verified by designing and simulating an equal-ripple X-band bandpass filter.
Abstract-A general method is proposed to analyze periodic or aperiodic Coupled Nonuniform Transmission Lines (CNTLs). In this method, the per-unit-length matrices are expanded in the Fourier series. Then, the eigenvalues of periodic CNTLs and so the S parameters of aperiodic CNTLs are obtained. The validity of the method is studied using a comprehensive example.
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