Cylindrical Waveguiding Structures with Complex Cross Sections in Microwave Units of Modern Information and Communicatio
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Cylindrical Waveguiding Structures with Complex Cross Sections in Microwave Units of Modern Information and Communication Systems D. V. Lonkinaa, D. S. Gubskiia, and V. V. Zemlyakova, * a
Southern Federal University, Rostov-on-Don, 344090 Russia *e-mail: [email protected]
Received April 13, 2020; revised April 13, 2020; accepted April 20, 2020
Abstract—Cylindrical waveguiding structures with complex transverse cross sections and application of the structures in modern information and communication systems are reviewed. History of and prospects for development of such microwave elements are considered, and methods for electrodynamic analysis are analyzed. Applications of complex cylindrical waveguide and coaxial structures as basic elements in the systems for generation of signals, radio communications, radars, and sounding are presented. DOI: 10.1134/S1064226920090053
INTRODUCTION Development of information and communication systems requires permanent improvement of main elements and devices of transceivers, in particular, transmitters, filters, directional couplers, multiplexers, and phase shifters. It is well known that application of waveguide technology makes it possible to substantially increase the transmitted power, decrease losses, and increase Q factors of frequency-selective elements and allows efficient operation at higher (in comparison with microstrip and coaxial lines) frequencies that may reach the terahertz range. Compact wideband waveguide elements employ transitions from waveguides with relatively simple cross sections to waveguides with complex cross sections, and insertion of dielectric elements makes it possible to obtain specific frequency-selective and polarization properties. In particular, rectangular and circular waveguides with metal ridges and piecewise layered dielectric filling are widely used in microwave technology. In spite of several significant advantages, components based on ridged circular waveguides are less popular than components based on rectangular waveguides. Circular waveguides, the corresponding computational methods, and possible applications have been considered in multiple works. However, the existing results are not systematized and cannot be used to fully characterize the development of such structures, algorithms for analysis, and new applications. In this work, we present data on various types of circular waveguides, analyze methods for calculation of electrodynamic parameters, and present applications of such structures.
1. TYPES OF CIRCULAR WAVEGUIDES A simplest circular waveguide represents an airfilled metal tube. Well-known electrodynamic properties of such waveguides have been thoroughly studied in several works (see, for example, [1, 2]). However, development of applied electrodynamics, application of new wavelength ranges of electromagnetic waves, and development of microwave technology lead to complication of elements of microwave devices. Practical applications account for interest in circular regular waveguides with complex transverse cross se
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