Analysis of Fabricability of Flexible Waveguide Parts for Satellite Applications

2021 ◽  
pp. 53-61
Author(s):  
S.V. Kosyanenko ◽  
E.V. Patraev ◽  
V.V. Petrusev ◽  
I.V. Trifanov
Keyword(s):  
Transmission Lines ◽  
Thermal Effects ◽  
Raw Materials ◽  
Sheet Material ◽  
Waveguide Section ◽  
Satellite Applications ◽  
Waveguide Transmission ◽  
Required Quality ◽  
Onboard Equipment ◽  
Structure Properties

Satellite onboard equipment includes waveguide transmission lines. One of the tasks to be solved is the temperature decoupling of the waveguide path and onboard equipment devices. In order to prevent waveguide path deformation during expansion/contraction due to thermal effects, the waveguide is equipped with a flexible waveguide section capable of changing the length without deteriorating radio technical characteristics. The paper considers the issues of fabrication of flexible waveguide parts, concerning the requirements for structure, properties, heat treatment of raw materials, dimensions of workpieces, equipment, and tooling. Within the study, we optimized and tested in practice operations of the technological process of extracting parts from sheet material, rolling, profiling, and shaping, which make it possible to manufacture parts of waveguide paths of the required quality.

Waveguade measurements of parameters the dielectric resonators in microwave

2016 ◽  
Author(s):  
Алексейчик ◽  
Leopard Alekseychik ◽  
Жохова ◽  
Marina Zhokhova ◽  
Любимова ◽  
...  
Keyword(s):  
Experimental Data ◽  
Quality Factor ◽  
Transmission Lines ◽  
Scattering Matrix ◽  
Dielectric Resonators ◽  
Frequency Range ◽  
High Quality ◽  
Waveguide Section ◽  
Waveguide Transmission ◽  
Constituent Elements

The article contains experimental data measurements of dielectric resonators (DR) made out of modern thermostable ceramic with high quality factor values and relative dielectric permittivity in the UHF frequency range. Unlike the hollow metallic microwawe resonators own parameters DR greatly depend on the design and its constituent elements, which installed DR. Measurement technique is based on the experimental scattering matrix defining the elements of dielectric resonators established in waveguide transmission lines and then calculate the integral parameters (resonance frequency and quality factor DR) of frequency characteristics of scattering matrix measurement of waveguide section.

Coplanar waveguide transmission lines and high Q inductors on CMOS grade silicon using photoresist and polyimide

1999 ◽  
Vol 35 (22) ◽  
pp. 1957 ◽  
Author(s):  
G. Ternent ◽  
S. Ferguson ◽  
Z. Borsosfoldi ◽  
K. Elgaid ◽  
T. Lohdi ◽  
...  
Keyword(s):  
Transmission Lines ◽  
Coplanar Waveguide ◽  
High Q ◽  
Grade Silicon ◽  
Waveguide Transmission

Thermoplastic Characteristics of Polymer Composite Materials Used for the Manufacture of Ship Systems Pipelines

2020 ◽  
Vol 869 ◽  
pp. 7-14
Author(s):  
Gia Viet Ngo
Keyword(s):  
Composite Materials ◽  
Polymer Composite ◽  
Raw Materials ◽  
Fire Hazard ◽  
Sheet Material ◽  
Polymer Composite Materials ◽  
Domestic Industry ◽  
Thermoplastic Matrix ◽  
Materials Used ◽  
Physical And Mechanical Characteristics

The article presents thermoplastic characteristics of polymer composite materials developed on domestic raw materials on a thermoplastic matrix-injection material of the VTP-7 brand based on polyaryl sulfones (polysulfone PSU) plastic and sheet material of the VKU-44 brand based on PSU and carbon unidirectional tape ELUR 0.08 PA. In the article, the author considered the modification method of thermoplastic polymers to impart functional properties and mechanisms of their action. It is shown that the developed materials have no analogues in the domestic industry. According to the level of physical and mechanical characteristics, fire-hazard properties and heat resistance, the developed polymer composite materials (PCM) fully meets the requirements for modern thermoplastic PCM, and is not inferior to foreign analogues.

Effective electromagnetic parameters of left-handed coplanar waveguide transmission lines

2011 ◽  
Vol 109 (7) ◽  
pp. 07A333 ◽  
Author(s):  
Jia-Hui Fu ◽  
Qun Wu ◽  
Guo-Hui Yang ◽  
Fan-Yi Meng ◽  
Jong-Chul Lee
Keyword(s):  
Transmission Lines ◽  
Coplanar Waveguide ◽  
Electromagnetic Parameters ◽  
Left Handed ◽  
Waveguide Transmission

Evaluation of the Industrial Raw Material Used for Ceramic Production in São José de Ubá, State of Rio de Janeiro, Brazil

2015 ◽  
Vol 820 ◽  
pp. 3-7 ◽  
Author(s):  
Afonso Rangel Garcez de Azevedo ◽  
Jonas Alexandre ◽  
Rafael Picanço Oliveira ◽  
Rodolfo Cretton de Souza ◽  
Euzébio Barnabé Zanelato ◽  
...  
Keyword(s):  
Mechanical Strength ◽  
Rio De Janeiro ◽  
Raw Materials ◽  
Northern Region ◽  
Raw Material ◽  
Ceramic Production ◽  
Ceramic Processing ◽  
Know How ◽  
Technological Evaluation ◽  
Required Quality

The northern region of the state of Rio de Janeiro, Brazil, has a significant participation in the country ceramic production for civil construction owing to the abundance of raw materials, mainly kaolinitic clays. Each municipality in that region has ceramic industries using raw materials mined from its own deposits. Products such as bricks and tiles may lack the required quality due to the limited know-how on the applied raw material. The present work conducted a technological evaluation of the clayey raw material used in the municipality of São José de Ubá including its potential for ceramic processing at firing temperatures of 700, 850 and 950oC. The results indicated that only the ceramic fired at 950oC conforms to the specifications for water absorption and mechanical strength.

scholarly journals Application of non-heating methods for disinfecting vegetable raw materials in the production of food

2020 ◽  
Vol 81 (4) ◽  
pp. 110-116
Author(s):  
N. V. Naumenko ◽  
I. Y. Potoroko ◽  
N. V. Popova ◽  
I. V. Kalinina ◽  
B. K. Satbaev
Keyword(s):  
Thermal Effects ◽  
Cold Plasma ◽  
Raw Materials ◽  
Food Products ◽  
Minimal Amount ◽  
Electromagnetic Pulses ◽  
Food Ingredients ◽  
Nanosecond Electromagnetic Pulses ◽  
And Migration ◽  
Vegetable Raw Materials

Possible risks associated with the accumulation and migration of mycotoxins during germination of crops are presented. The presence of an acceptable level of surface microflora of grain can, during germination, intensify the accumulation of mycotoxins, which later migrate into the finished product, making it dangerous for the consumer. It is noted that the process of germination of grain crops cannot be carried out without the stage of disinfection. Promising methods of grain disinfection using non-thermal effects of exposure and the results of our own research are given. It is noted that the concept of food safety in world practice today is aimed at preserving the main food ingredients and their properties. Thermal effects lead to an effective reduction in the development of microorganisms, but at the same time cause significant losses of thermolabile compounds and adversely affect the organoleptic, physicochemical and functional properties of the final product. Ultrasonic exposure, nanosecond electromagnetic pulses and exposure to cold plasma are proposed as disinfecting methods. The methods presented today are widely used in world practice. They allow not only to deactivate molds, but also to destroy the already formed aflatoxins in food products (use of cold plasma). Based on the foregoing, it can be said that the danger of pathogenic microflora ingress and aflatoxin accumulation in food products (especially whole grains) is still present, since even a minimal amount of them can cause global harm to public health, therefore, the search and development of new disinfection methods is an urgent problem modern production.

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