scholarly journals Comparative analysis methodologies formulation powers in the frequency domain

2017 ◽  
Vol 1 (15) ◽  
pp. 350-355
Author(s):  
G.J. Schäffer ◽  
S.L. Modesto ◽  
T.S. Menezes ◽  
Y.V. Tresso ◽  
F.A.M. Moura ◽  
...  
Keyword(s):  
Comparative Analysis ◽  
Frequency Domain

scholarly journals A Comparative Analysis of Laguerre-Based Approximators to the Grünwald-Letnikov Fractional-Order Difference

2015 ◽  
Vol 2015 ◽  
pp. 1-10 ◽  
Author(s):  
Rafał Stanisławski ◽  
Krzysztof J. Latawiec ◽  
Marian Łukaniszyn
Keyword(s):  
Steady State ◽  
Comparative Analysis ◽  
Comparative Study ◽  
Frequency Domain ◽  
Fractional Order ◽  
Order Difference

This paper provides a series of new results in both steady-state accuracy and frequency-domain analyses for two Laguerre-based approximators to the Grünwald-Letnikov difference. In a comparative study, the Laguerre-based approximators are found superior to the classical Tustin- and Al-Alaoui-based approximators, which is illustrated in simulation examples.

scholarly journals Comparative Analysis of Compact Satellite Polarizers Based on a Guide with Diaphragms

2021 ◽  
Author(s):  
Stepan Piltyay
Keyword(s):  
Comparative Analysis ◽  
Frequency Domain ◽  
Frequency Interval ◽  
Frequency Range ◽  
Electromagnetic Parameters ◽  
Satellite Systems ◽  
Operating Frequency Range ◽  
High Level ◽  
Compact Waveguide ◽  
Polarization Converters

In this article we carry out the comparative analysis of new compact satellite polarisers based on a square guide with diaphragms. The main electromagnetic parameters of the developed microwave guide devices with various amount of diaphragms were obtained within the satellite frequency interval from 10.7 GHz to 12.75 GHz. Waveguide polarization converters with different amount of diaphragms from 3 to 5 have been designed and optimized. The main parameters of the presented polarizer were calculated applying the numerical method of finite integration in the frequency domain. Optimization of the electromagnetic parameters of the developed waveguide devices was carried out using the finite elements method in the frequency domain. As a result, sizes of the guide polarizer designs have been optimized for the provision of improved polarization and phase parameters. The performed analysis showed that a waveguide polarizer with five diaphragms has the best electromagnetic parameters. The developed compact polarizer with five diaphragms based on a square guide provides a minimum deviation of the output phase difference from 90 degrees and high level of isolation between linear polarization over the entire operating frequency range. Presented in the article compact waveguide polarization converters can be applied in modern satellite systems, which require efficient polarization transformation and separation of signals.

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