vector network analyzer
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Author(s):  
Н.С. Князев ◽  
А.И. Малкин ◽  
В.А. Чечеткин

An experimental method was developed to determine losses in microstrip and coplanar transmission lines for devices operating in the frequency range 77 - 81 GHz. The parameters of the scattering matrices are obtained using a vector network analyzer and frequency upconverters. The calculation of losses in waveguide-coplanar and coplanar-microstrip junctions is made.


2022 ◽  
pp. 189-209
Author(s):  
Ebru Efeoglu ◽  
Gurkan Tuna

Liquids and solvents in industrial products produce flammable vapor which, when mixed with air, can ignite or explode. The ease by which those liquids produce flammable vapors depends on their flashpoints which allow them to be categorized according to the fire hazard they exhibit in their normal use. In this chapter, a novel approach for the classification of liquids is proposed. The proposed approach relies on the use of a vector network analyzer, a patch antenna, and a group of classifiers. In this study, random forest and REPTree algorithms are preferred as classifers. As proven in the study, random forest algorithm can provide higher accuracy than REPTree algorithm in the classification of hazardous liquids. A prototype system is currently under development in order to integrate the components of the proposed approach into a single unit. It is expected that the prototype system will quickly and reliable make a non-contact classification of liquids in different kinds of bottles.


2021 ◽  
Vol 19 ◽  
pp. 17-22
Author(s):  
Andreas Depold ◽  
Stefan Erhardt ◽  
Robert Weigel ◽  
Fabian Lurz

Abstract. This publication introduces a low-cost vector network analyzer with very large frequency range made of commercial off-the-shelf components. It utilizes two identical receivers and two directional bridges to allow for two fully bidirectional measurement ports. The design surpasses the performance of competing low-cost network analyzers in regards of dynamic range, frequency span and calibration capability.


2021 ◽  
pp. 29-36
Author(s):  
Thomas Kleine-Ostmann

Author(s):  
O. B. Arafat ◽  
A. Abderahim ◽  
A. Ouzer Nabil ◽  
D. Vincent

Calibrating network analyzer is still an issue for bended access port devices (devices with access). Bended accesses can give additional errors which are taken into account by using a new design standards of Vector Network Analyzer (VNA) calibration. This Thru-Reflect-Line calibration technique is computed from ABCD parameters that easily allow to remove the bended port effects. This approach is based on the assumption that the Vector Network Analyzer error boxes can be considered as passive system. Furthermore, the method can be applied for de-embedding devices with bended accesses. This calibration and de-embedding technique could be applied, for example, to a coplanar circulator or a power divider measurement which have access lines at 120° from each other.


2021 ◽  
Vol 1198 (1) ◽  
pp. 012005
Author(s):  
YuN Gladkov ◽  
AS Kachalov ◽  
EYu Korovyn ◽  
AA Pavlova

Abstract The electromagnetic characteristics of composite materials based on nanosized powders of W-type hexaferrites are considered in the article. It is shown that not only the composition, but also the mechanical treatment affects the electromagnetic parameters. This article presents the frequency dependence of the complex magnetic and dielectric permittivity of a system of W-type hexafferites. The studies were carried out on a universal wide-band measuring complex based on the Agilent PNA-X N4257A Vector Network Analyzer. The results are presented in the frequency range from 2 to 14 GHz.


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