A.V. Ostankov – Dr.Sc. (Eng.), Associate Professor, Professor,

Department of Radio Engineering, Voronezh State Technical University (Voronezh, Russia) Researcher ID: C-7543-2016, Scopus ID: 7004240250, ORCID: 0000-0002-2039-4081

E-mail: avostankov@mail.ru

V.N. Kostrova – Dr.Sc. (Eng.), Professor, 

Department of Computer Aided Design and Information Systems, 

Voronezh State Technical University (Voronezh, Russia)

Researcher ID: B-2777-2018, Scopus ID: 57191981074 

E-mail: kostrova_v@mail.ru

N.N. Shchetinin – Lecturer,

Chair Bases of а Radio Engineering and Electronics, 

Voronezh Institute of the Russian Federal Penitentiary Service (Voronezh, Russia)  E-mail: nikita.shetinin@mail.ru.

K.A. Razinkin – Dr.Sc. (Eng.), Associate Professor, Professor,

Department of Information Security Systems, Voronezh State Technical University (Voronezh, Russia)  Researcher ID: P-4879-2015, Scopus ID: 6508383606, ORCID: 0000-0002-2032-3777 E-mail: mnac@comch.ru

Problem statement. A number of conflicting requirements are imposed on modern UHF and microwave microstrip devices. On the one hand, their overall dimensions should be minimal, on the other hand, miniaturized devices should guarantee the specified technical indicators. In some cases, it is also necessary to expand the functionality of the device, ensure its frequency versatility, and increase the operating frequency band. Microstrip directional couplers, which are widely used in diagram-forming schemes of phased array antennas, balanced mixers, power addition and division devices, are no exception.

Purpose of work. To acquaint with the author's developments in the field of miniaturization of microstrip two-loop directional couplers and the approaches used in this case.

Results. Original topologies of microstrip double-loop directional couplers for the short-wave part of the UHF range and the long-wave part of the microwave are presented, which differ from the traditional topology in significantly reduced overall dimensions. The miniaturization effect is achieved by replacing traditional quarter-wave loops with small-sized loops. The loops are implemented on the basis of T-shaped sections with interdigital structures, artificial long lines in the form of a combination of meander lines and interdigital structures, and a system of open resonators at the end. It is indicated that the approaches used to miniaturization make it possible to achieve a gain in the area occupied by the coupler topology by (70-85) % relative to the traditional topology. All developed modifications of couplers are accompanied by the results of electromagnetic modeling in the form of frequency dependences of the reflection coefficient, working attenuation, transition attenuation and isolation, as well as the phase difference of the signals at the main and auxiliary outputs. It is noted that the frequency characteristics of the designed couplers are characterized by slightly larger deviations from idealized values.

Practical significance. The application of the used approaches to miniaturization will allow to provide a significant reduction in the topology area of directional couplers with insignificant deterioration of their technical indicators.

Ostankov A.V., Kostrova V.N., Shchetinin N.N., Razinkin K.A. Modifications of directional couplers with small-sized circuits of non-standard configuration. Radiotekhnika. 2020. V. 84. № 6(12). P. 496−57. DOI: 10.18127/j00338486202006(12)-09.

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