scholarly journals Determination of Complex Conductivity of Thin Strips with a Transmission Method

Electronics ◽  
2018 ◽  
Vol 8 (1) ◽  
pp. 21 ◽  
Author(s):  
Morteza Shahpari
Keyword(s):  
Method Of Moments ◽  
Material Properties ◽  
Reflection And Transmission Coefficients ◽  
Complex Conductivity ◽  
Transmission Method ◽  
Reflection And Transmission ◽  
Wave Modelling ◽  
Transmission Coefficients ◽  
Full Wave

Induced modes due to discontinuities inside the waveguide are dependent on the shape and material properties of the discontinuity. Reflection and transmission coefficients provide useful information about material properties of discontinuities inside the waveguide. A novel non-resonant procedure to measure the complex conductivity of narrow strips is proposed in this paper. The sample is placed inside a rectangular waveguide which is excited by its fundamental mode. Reflection and transmission coefficients are calculated by the assistance of the Green’s functions and enforcing the boundary conditions. We show that resistivity only impacts one of the terms in the reflection coefficient. The competency of the method is demonstrated with a comparison of theoretic results and full wave modelling of method of moments and finite element methods.

Determination of Reflection and Transmission Coefficients in Rigidly Connected Beams Using Timoshenko Beam Theory

1996 ◽  
Author(s):  
James Stolte ◽  
Joseph M. Santiago
Keyword(s):  
Power Flow ◽  
Beam Theory ◽  
Reflection And Transmission Coefficients ◽  
Wave Incident ◽  
Euler Beam ◽  
Reflection And Transmission ◽  
High Frequencies ◽  
Transmission Coefficients ◽  
Euler Beam Theory

Abstract Knowledge of the behavior of a wave incident at a joint is necessary to properly analyze the vibration of a structure. We need to know how much energy is reflected and transmitted and also the type of wave carrying the energy. Typically, Euler beam theory is used to derive the reflection and transmission coefficients at high frequencies. Errors can become unacceptably large in the frequency range currently being analyzed using Statistical Energy Analysis (SEA) and the Power Flow Finite Element Method (PFFEM). We derive reflection and transmission coefficients due to a bending wave incident on a rigid joint between two infinitely long beams using Timoshenko theory and compare results to those obtained using Euler theory. We also compute the reflection and transmission efficiencies that determine the amount of power carried by each wave.

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