Issue №: 2(109)
В журналі вирішуються проблеми створення та удосконалення техніки та технологій для сільського господарства, харчових та переробних виробництв, машинобудування, енергетики та транспорту.
CALCULATION OF NON-STANDARD W-PARAMETERS OF FOUR-POLE ON BIPOLAR TRANSISTORS
Oleksandr Vozniak – сandidate of Science (Engineering), Associate Professor of the Department of Electric Power Engineering, Electrical Engineering and Electromechanics of Vinnitsia National Agrarian University (3 Soniachna St., Vinnitsa, 21008, Ukraine, email: alex.voz1966@gmail.com).
Andrii Shtuts – Assistant Professor, Department of Electric Power Engineering, Electrical Engineering and Electromechanics, Vinnitsia National Agrarian University (3, Solnechna str., Vinnitsia, 21008, Ukraine, email: shtuts1989@gmail.com).
Improving the performance of microwave devices can be achieved both through the use of a fundamentally new element base, and through the use of new circuit designs. In this respect, the direction of use of the reactive properties of transistors as well as transistor structures with negative resistance for the construction of information-measuring systems and operating and computing devices of the microwave range is promising in this respect.
In order to confirm the proposed methods, it is necessary to compare the results of the experimental studies using the proposed methods and means of measuring the W-parameters of real potentially unstable four-poles. As such four-poles it is proposed to use bipolar and transistors with a wide range of frequencies of potential instability. The paper develops mathematical models of W-parameters of such structures and evaluates their parameters in the frequency range.
The active four-pole is a transistor model. Its W parameters can be determined either experimentally - for specific conditions or calculated - by using a physical transistor replacement circuit. In most cases, the calculation path is more acceptable because it allows to obtain analytical expressions for the four-pole, it is important in the analysis of the influence of various factors on the characteristics of the scheme under study.
The inertial properties of the transistor are already manifested at relatively low frequencies and must be taken into account in practically the entire operating range of the transistor. The theoretical model holds up to frequencies f 2fт (where ft is the limit frequency) [1,3]. At higher frequencies, it is necessary to consider the parasitic reactive parameters of real transistors, first of all, the inductance of the terminals.
A physically T-equivalent equivalent transistor replacement scheme was proposed by Pritchard in a simplified version [4]. It has several varieties, differing in the configuration of the circuit consisting of the resistance of the base material and the capacity of the collector junction. If we carefully consider and compare the T and U-shaped circuits of the transistor substitution, it can be noticed that they differ only in the configuration of their inne r part - the theoretical model. At high frequencies P and T, such circuits are not exact mutual equivalents. This is due to the approximation used in the transition from one circuit to another. However, the frequency characteristics of the circuits are very close. Each of them models the processes in the transistor with approximately the same accuracy, and in this sense they are equivalent.
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About the journal
G8 – Materials Science
G9 – Applied Mechanics
G10 – Metallurgy
G11 – Mechanical Engineering (by specializations)
The journal "Engineering, Energy, Transport AIC" is indexed according to the following databases and catalogs:
The All-Ukrainian scientific journal “Technology, energy, agriculture transport AIC” is an open-access scientific publication that publishes the results of original research, theoretical and applied developments, as well as scientific papers in the fields of engineering sciences, energy systems, and transport technologies of the agro-industrial complex.
The main objective of the scientific journal “Technology, energy, agriculture transport AIC” is to disseminate the results of modern scientific research and to promote the development of technical, energy, and transport solutions for the agro-industrial complex through the publication of scientific materials characterized by scientific novelty and practical significance in the field of design and modernization of machinery, equipment, and technologies.
The journal’s activities are focused on supporting the development of engineering science, stimulating the implementation of innovative approaches into industrial practice, as well as ensuring effective exchange of scientific achievements among researchers, educators, engineers, and other specialists in relevant fields.
Objectives of the Journal
To achieve its defined objective, the journal ensures the implementation of the following key tasks:
· publication of the results of fundamental and applied research covering the fields of applied mechanics, mechanical engineering, materials science, energy systems, electrical engineering, electromechanics, and transport systems of the agro-industrial sector;
· promotion of the implementation of advanced technical and technological developments aimed at improving the efficiency of machinery, equipment, and production processes;
· creation of conditions for active scientific exchange among research institutions, higher education institutions, industrial enterprises, and other interested organizations;
· support for the development of interdisciplinary research and expansion of cooperation among specialists in various fields of science and technology;
· promotion of the improvement of the scientific and technical level of research related to the design, modernization, and operation of technical equipment used in agro-industrial production;
· dissemination of information on modern achievements in science and technology and the implementation of innovative technologies in the fields of technical support, energy, and transport;
· development of a scientific information environment that facilitates effective scientific communication and the integration of national research into the international scientific community.
Publication frequency: 4 issues per year
Languages of publication: Ukrainian, English
Editor-in-Chief: Vitalii YAROPUD
State Registration: Decision of the National Council of Ukraine on Television and Radio Broadcasting № 1337 and № 1180. Media Identifier: R30-05173
EDRPOU Code: 00497236
Publisher ROR: https://ror.org/05m3ysc06
Publisher DOI Prefix: 10.37128
Technology, energy, agriculture transport AIC is a scholarly professional journal with a long-standing history and stable academic tradition, reflecting the evolution of engineering and technical sciences within the agro-industrial sector of Ukraine.
The journal was founded in 1997 under the title Bulletin of Vinnytsia State Agricultural Institute. According to the Resolution of the Presidium of the Higher Attestation Commission of Ukraine dated September 11, 1997, the publication obtained the status of a professional scientific journal, which enabled the publication of the main results of doctoral and candidate dissertations in technical sciences. From its inception, the journal positioned itself as an academic platform for addressing current issues of mechanization, electrification, and technical support of agricultural production. During 2001–2014, the journal was published under the title Proceedings of Vinnytsia National Agrarian University. Series: Technical Sciences (State Registration Certificate of Print Media KV No. 16644-5116 PR dated April 30, 2010). Throughout this period, a systematic approach to the selection and peer review of scientific manuscripts was established, the thematic scope of publications was expanded, and continuity of scientific directions as well as the development of sectoral engineering schools was ensured. Since 2015, the journal has been published under its current title, Technology, energy, agriculture transport AIC (State Registration Certificate No. 21906-11806 R dated March 12, 2016). The change of title reflected the expansion of the journal’s thematic coverage and its orientation toward interdisciplinary research in mechanical engineering, energy systems, electrical engineering, transport technologies, automation, and digital solutions for the agro-industrial complex.
