A systematic procedure is presented for synthesis of generalized Chebyshev lossy bandstop filters with non-paraconjugate transmission zeros. From a lossy scattering parameters with the prescribed reflection zeros, the transformation formulas from the scattering matrix to the admittance matrix are obtained by reconstructing the non-paraconjugate transmission zeros as paraconjugate ones. The cano...

The aim of this work is to implement a hybrid approach able to provide an efficient solution of the electromagnetic coupling between an antenna and an obstacle distant few meters away. The idea is to divide the problem into a small number of less complex sub-problems exploiting the advantage of generating the admittance matrix that describes the scattering problem by a numerical code. To this e...

In this paper, we propose a simple technique to analyze absorber/transmitter frequency selective surfaces (FSS). The structure is formed by two FSS, one resistive and conductive. Both FSS are printed on an FR4 dielectric substrate. square loop crossed dipole the geometries considered in paper. combines approaches, equivalent circuit method, scattering matrix method. Two prototypes were built fo...

The importance of the reduction of atmospheric pressure effects becomes very clear when investigating seismic normal-mode spectra below 1.5 mHz. The usual simple correction method consists in subtracting a term converted from local atmospheric pressure (pressure multiplied by a frequency-independent admittance) from the gravity record in time domain. Thus, estimating an efficient admittance is ...

In transient stability studies in power networks two types of mathematical models are commonly used – the differential-algebraic structure-preserving model and the reduced dynamic model of interconnected swing equations. This paper analyzes the reduction process relating the two power network models. The reduced admittance matrix is obtained by a Schur complement of the topological network admi...

In single-phase voltage source inverters under a weak grid, the frequency coupling, caused by asymmetrical system structure, poses challenge to modeling and controller design. this article, coupling suppression control strategy is presented, where all components in current reference are eliminated. As result, grid-tied inverter directly modeled as simple single-input single-output (SISO) admitt...

The application of scanning microwave microscopy (SMM) to extract calibrated electrical properties of cells and bacteria in air is presented. From the S 11 images, after calibration, complex impedance and admittance images of Chinese hamster ovary cells and E. coli bacteria deposited on a silicon substrate have been obtained. The broadband capabilities of SMM have been used to characterize the ...

A trans-admittance scanner (TAS) is a device for breast cancer diagnosis based on numerous experimental findings that complex conductivities of breast tumors significantly differ from those of surrounding normal tissues. In TAS, we apply a sinusoidal voltage between a handheld electrode and a scanning probe placed on the breast skin to make current travel through the breast. The scanning probe ...

Sameer Hemmady , Xing Zheng , James Hart , Thomas M. Antonsen Jr. , Edward Ott 1,2,3 and Steven M. Anlage . Department of Physics, University of Maryland, College Park, MD 20742-4111, U.S.A. [Dated: July 10 , 2006]. Abstract: Statistical fluctuations in the eigenvalues of the scattering, impedance and admittance matrices of 2-Port wave-chaotic systems are studied experimentally using a chaotic ...