The complex propagation constant of multilayer waveguides: an algorithm for a personal computer

1990 ◽  
Vol 26 (4) ◽  
pp. 627-630 ◽  
Author(s):  
K.-H. Schlereth ◽  
M. Tacke
Keyword(s):  
Personal Computer ◽  
Propagation Constant ◽  
Complex Propagation

scholarly journals Analysis of Propagation Characteristics along an Array of Silver Nanorods Using Dielectric Constants from Experimental Data and the Drude-Lorentz Model

Electronics ◽  
2019 ◽  
Vol 8 (11) ◽  
pp. 1280 ◽  
Author(s):  
Zong ◽  
Zhang
Keyword(s):  
Experimental Data ◽  
Propagation Constant ◽  
Single Mode ◽  
Expansion Method ◽  
Dielectric Constants ◽  
Fourier Series Expansion ◽  
Lorentz Model ◽  
Silver Nanorods ◽  
Complex Propagation ◽  
Multi Mode

In this study, the Fourier series expansion method (FSEM) was employed to calculate the complex propagation constants of plasma structures consisting of infinitely long, silver nanorod arrays in the range of 180–1900 nm, and the characteristics of the complex propagation constant were analyzed in depth. According to the results of FSEM using dielectric constants from Johnson experimental data, a multi-mode frequency band appears in the propagation stage, which can be adopted to achieve a multi-mode communication, multi-mode transceiver, integrated filter with single multi-mode combination. In the meantime, the comparison between the three sets of results with only single mode transmission of the generalized multipole technique (GMT) using dielectric constants from Johnson experimental data, FSEM using dielectric constants from Palik experimental data, and FSEM using dielectric function from Drude–Lorentz model suggested that the results of the four sets of complex propagation constants were well consistent with each other. Furthermore, a finite array of only 40 silver nanorods was studied, and the ability of guided waves when a finite array is excited by a plane wave at a specific wavelength was explored. According to different guiding abilities—propagation, attenuation, and cut off, it can be applied to waveguides, sensor, filters, etc.

scholarly journals Double-scale homogenized impedance models for periodically modulated metasurfaces

2020 ◽  
Vol 7 ◽  
pp. 12
Author(s):  
Enrica Martini ◽  
Francesco Caminita ◽  
Stefano Maci
Keyword(s):  
Surface Wave ◽  
Propagation Constant ◽  
Dielectric Slab ◽  
Wave Analysis ◽  
Impedance Model ◽  
Full Wave ◽  
Air Interface ◽  
Full Wave Analysis ◽  
Complex Propagation ◽  
Impedance Models

This paper investigates the accuracy of homogenized impedance models for the description of periodically modulated metasurfaces (MTSs) realized by printing subwavelength patches on a grounded dielectric slab. The problem is relevant to surface-wave based MTS antennas. The homogenized models are based on the local impedance synthesis of the subwavelength patch elements on the basis of a micro-periodicity assumption (that is, with a subwavelength period); the homogenized impedance is successively used in a macro-periodically modulated problem; that is, a periodic homogenized problem with a period which includes several micro-periods. Two different homogenized impedance models are compared. A first model is based on an anisotropic “impenetrable” impedance, defined by boundary conditions (BCs) at the MTS-air interface, while the second one uses a “penetrable” impedance sheet describing the homogenized BCs imposed by the metallic cladding on the grounded metallic slab. Although the presence of the grounded slab is considered in both models, they provide different results when the homogenized impedance is used to describe the macro-modulation. It is shown, through comparison with a full-wave analysis, that both the homogenized models can provide consistent results, but the penetrable impedance model is more accurate in the prediction of both the complex propagation constant and the current distribution. This is due to its capability to correctly account for the spatial dispersivity of the MTS.

The Characterisation of Fibrous Materials from Measurements of Absorption Using Techniques Based on the Voronina Model

2000 ◽  
Vol 31 (3) ◽  
pp. 14-19
Author(s):  
Jesus Alba ◽  
Jaime Ramis ◽  
Jaime Llinares
Keyword(s):  
Structural Characteristics ◽  
Propagation Constant ◽  
Fibrous Materials ◽  
Special Equipment ◽  
Complex Propagation ◽  
Specific Impedance ◽  
Absorption Measurements

In this work we present a method for characterising fibrous materials from absorption measurements in the Kundt tube. One may calculate the structural characteristics, the complex propagation constant and the specific impedance of material using techniques based on the Voronina Model. Furthermore, this method allows one to estimate the diameter of a fibre for its use in other models, and does not require any special equipment.

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