S.N. Boyko – Ph.D. (Phys.-Math.), Deputy Head of Research and Production Complex, 

Branch of JSC «URSC» – «ISDE» (Moscow)

E-mail: boyko_sn@orkkniikp.ru 

E.A. Zevakin – Research Engineer, 

Branch of JSC «URSC» – «ISDE» (Moscow)

E-mail: zevakin_ea@orkkniikp.ru

O.V. Koryshev – Ph.D. (Eng.), Senior Research Scientist, 

Branch of JSC «URSC» – «ISDE» (Moscow)

E-mail: koryshev _ov@orkkniikp.ru

I.M. Trukhachev – Ph.D. (Eng.), Head of Research and Production Complex, 

Branch of JSC «URSC» – «ISDE» (Moscow)

E-mail: trukhachev_im@orkkniikp.ru

Problem definition. Many VHF communication devices includes multi–frequency vibrator antennas with reactive loads. However, to date there was no sufficiently simple model for calculating the input characteristics of such antennas, which makes it possible to achieve matching of the vibrator antenna in several operating frequency bands.

Purpose. The purpose of this paper is to develop an engineering methodology for calculating the input characteristics of multi– frequency vibrator antennas, suitable both for smooth vibrators with reactive loads, and for shortened helical vibrators with reactive loads.

Results. The paper presents the formulas for smooth and helical vibrators and a methodology for calculating the input impedance based on the idea, that a multi–frequency vibrator is represented in the form of an equivalent long line with reactive loads along its length. Also this paper contains the calculation of a dual–frequency smooth vibrator of D range with a concentrated and half– concentrated (coil) inductive loads, as well as three–frequency helical vibrators with inductive loads in the form of a coil with a tight loops. The calculated and experimental results are presented both on the Smith diagram (for the input impedance) and in the Cartesian coordinate system for the VSWR. A comparison of the calculated and experimental data showed a coincidence acceptable for the designing the multi–frequency vibrator antennas with reactive loads.

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