Measurement methods and mathematical model of main characteristics of waveguide-coaxial connectors

Eduard Glushechenko

doi:10.15222/TKEA2021.5-6.16

Eduard Glushechenko PJSC "SPE "SATURN"

DOI: https://doi.org/10.15222/TKEA2021.5-6.16

Keywords: microwave, connector, waveguide, coaxial, matching, VSWR, loss, modeling

Abstract

Modern complex microwave radio electronic systems may use functional devices implemented on different types of transmission lines. In order to connect such devices to each other to form antenna feed system, the following three types of special connectors can be used: coaxial, waveguide, and combined microwave devices based on waveguide and coaxial segments.
The main electrical characteristics of waveguide coaxial connectors (WCC) are the losses introduced by the device to the antenna feed and matching with the regular microwave path (voltage standing-wave ratio, VSWR). Standard methods and standard equipment used to measure the characteristics of coaxial or waveguide connectors cannot be applied to WCCs.
This article proposes a method designed to measure the main characteristics of waveguide-coaxial connectors and presents their mathematical model (wave matrices). The proposed methods of measuring microwave characteristic are demonstrated on the example of waveguide coaxial connectors of longitudinal coaxial type.
It should be noted that the proposed technique has been experimentally tested on a number of specific devices. Not only the waveguide coaxial connectors have been studied in different frequency ranges (waveguide sizes from 23×5 to 58×25 mm), but also with different coaxial channel designs (sizes 3.5/1.52; 6.0/2.6 and 7.0/3.04 mm).
The proposed method provides replicable measurements results of the characteristics of waveguide coaxial connectors, which confirms its reliability.

References

Maloratskiy L.G., Yavich L.R. Proyektirovaniye i raschet SVCH-elementov na poloskovykh liniyakh [Design and Calculation of Microwave Elements on Strip Lines]. Moscow, Sov. Radio,1972, 276 p.

Valitov R.A., Sretenskiy V.N. Radiotekhnicheskiye izmereniya [Radio Engineering Measurements]. Moscow, Sov. Radio, 1970.

Dzhurinskiy K.B. Miniatyurnyye koaksial’nyye radiokomponenty dlya mikroelektroniki SVCH [Miniature Coaxial Radio Components for Microwave Microelectronics]. Moscow, Tekhnosfera, 2006, 216 p.

Mozharovskiy A.V., Artemenko A.A., Maslennikov R.O., Vendik I.B. Design of wideband waveguide-to-microstrip transition for 60 GHz frequency band. Journal of the Russian Universities. Radioelectronics. 2019;22(4):31-44. https://doi.org/10.32603/1993-8985-2019-22-4-31-44

Mozharovskiy A.V., Soykin O.V., Artemenko A.A. et al. Wideband waveguide-to-microstrip transition for mm-wave applications. Journal of the Russian Universities. Radioelectronics. 2019;22(5):17-32. https://doi.org/10.32603/1993-8985-2019-22-5-17-32

Glushechenko E. M. [Longitudinal-Coaxial Waveguide-Coaxial Transformer]. Patent of Ukraine 147621, bull. no. 21, 2021.

Tisher F. Tekhnika izmereniy na sverkhvysokikh chastotakh: Spravochnoye rukovodstvo [Technique of Measurements at Microwave Frequencies: A Reference Guide]. Moscow, Fizmatgiz, 1963, 368 p.

Fel’dshteyn A.L., Yavich L.R. Sintez chetyrekhpolyusnikov i vos’mipolyusnikov na SVCH [Synthesis of Four-Terminal and Eight-Terminal Networks at Microwave Frequencies]. Moscow, Svyaz’, 1971, 388 с.