V.P. Meschanov – Honored Scientist of RF, Dr.Sc. (Eng.), Professor, 

Director of NIKA-Microwave, Ltd (Saratov)

E-mail: nika373@bk.ru

K.A. Sayapin – Engineer, 

NIKA-Microwave, Ltd (Saratov)

E-mail: sayapin.k.a@mail.ru

D.N. Sherstyukov – Applicant,

Department Radio Electronics and Telecommunications, 

Yuri Gagarin State Technical University of Saratov E-mail: shed77@mail.ru

One of the main types of passive functional microwave devices are fixed phase shifters. Expanding the working frequency range of fixed phase shifters and reducing their overall dimensions are some of the most urgent tasks of microwave technology. To solve them, it is necessary to search and study new structures of the electric circuits of the phase-shifting channel, implemented using transmission lines and stubs of various types. The most widespread are the phase-shifting channel structures based on stepped coupled transmission lines with matched loads and on the basis of stepped single transmission lines loaded with short-circuited and open stubs. In this work, we study a fixed phase shifter with a phase-shifting channel based on a single nonlinear transmission line with a nonlinear short-circuited stub. In the TEM-wave approximation, a fixed phase shifter with a nominal value of the phase shift φ0=45° and a coefficient of overlapping the working frequency range ϰ = 2 was synthesized. Based on the results obtained, circuitry and electrodynamic models of a microstrip fixed phase shifter for a frequency range of 2...4 GHz are developed. A prototype of a phase-shifting channel was made and experimentally studied. The experimental value of the VSWR does not exceed 1,15, and the deviation of the phase-frequency characteristic from the nominal value of 45° is 1,01° in a given frequency range. The research results presented in the work can be used in the development of broadband and ultra-wideband phase shifting devices for radio signals.

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