G.A. Malyutin1

1 Tomsk State University of Control Systems and Radioelectronics (TUSUR) (Tomsk, Russia)

1 Research Institute of Communication Systems (Tomsk, Russia)

1 mr.mageorge@yandex.ru

Problem Statement. The presence of signal reflections at out-of-band frequencies is undesirable in a number of cases. This applies to multi-channel systems, to circuits containing nonlinear elements. The solution to the problem of reducing reflections while maintaining frequency-selective properties allows eliminating the negative impact of re-reflections on radio-electronic equipment. Therefore, the direction of creating non-reflective frequency-selective circuits and non-reflective filters based on them has recently begun to develop.

Purpose. To develop a method for forming the structure of non-reflecting distributed-concentrated circuits based on the construction of frequency plans and the analysis of the necessary physical properties of the elements of the structural diagram.

Results. A method for synthesizing the structure of non-reflective distributed-concentrated circuits has been proposed and developed, based on the construction of frequency plans and analysis of the necessary physical properties of the elements of the structural diagram. The concept of an absorber of reflected waves arriving at the circuit output from the source of reflected waves has been introduced. Such a source is a bandpass filter that reflects out-of-band frequencies with a reflection coefficient close to unity. A non-reflective distributed-concentrated circuit with bandpass characteristics acts as an absorber of reflected waves. Examples are given of the modeling and implementation of non-reflective distributed-concentrated circuits, including a section of coupled strip lines and buffer resonant loads in the diagonal arms of coupled strip lines with different impedance-frequency dependencies. The application of two different distributed circuits in non-reflective circuits for the design of non-reflective bandpass filters is shown. One of the distributed circuit options is coupled strip lines with a vertical dielectric substrate, which implements strong front electromagnetic coupling. The second variant demonstrates the achievability of strong electromagnetic coupling in a design with planar conductors over which a dielectric substrate with a third free strip line.

Practical significance. The developed method is used to form a structural diagram and select elements of non-reflective distributed-concentrated circuits. The considered variants of the circuit diagram can be used to design non-reflective microwave band-pass filters. The developed models of non-reflective circuits and their implementations are used as "traps" for reflected waves in microwave paths containing sources of reflected waves.

The work was supported by the Ministry of Science and Higher Education of the Russian Federation under Project No. FEWM-2023-0014, dated 16.01.2023.

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