S.N. Boyko1, A.M. Egiazaryan2, O.V. Koryshev3, I.M. Trukhachev4

1-4 Branch of JSC “URSC” – “ISDE” (Moscow Russia)

Problem definition. Many VHF communication devices include multi-frequency vibrator antennas, among which a special place is occupied by the vibrator antennas with reactive loads as the most compact and simplest to produce. However, inductive loads usually used in practice don’t provide current cut-off at higher operating frequencies, which results in deformations of radiation patterns. There is a need to apply resonant loads (LC-circuit) in antenna design. Previously, authors developed a methodology for calculating antennas with reactive loads based on serial application of the long lines theory to the various parts of the vibrator antenna both for determination the input characteristics, and for calculating current distribution along the vibrator and far-field radiation patterns. However, it turned out that a direct use of this methodology for calculating characteristics of the vibrator antenna with resonant loads is impossible.

Purpose. The purpose of this paper is to adapt the methodology for calculating multi-frequency vibrator antenna characteristics (input impedance, VSWR, current distribution over the vibrator, far-field radiation patterns), which is based on serial application of the long lines theory to the various parts of the vibrator antenna, in case of using resonant loads (LC-circuits).

Results. This paper explores an influence of shunt capacitance and inductance caused by insertion of parallel LC-circuit into a vibrator gap. The formulas for calculating shunt capacitance and inductance of the vibrator antenna are given. An equivalent scheme for the design the vibrator antenna with single LC-circuit is shown. Also this paper contains the calculation of input impedance, VSWR, current distribution over the vibrator and radiation patterns, based on proposed equivalent scheme. An experimental verification of calculated data (VSWR and far-field radiation pattern) is done. An additional matching circuit for the vibrator antenna with LC-circuit load is suggested and realized. Applicability of proposed methodology for the design of the multi-frequency vibrator antennas with parallel LC-circuits is proved by analyzing calculated and experimental data.

Practical significance. The results can be used to design the multi-frequency VHF vibrator antennas with resonant loads (LC-circuits), which have the identical radiation patterns at all operating frequencies.

Boyko S.N., Egiazaryan A.M., Koryshev O.V., Trukhachev I.M. Designing of a multi-frequency vibrator antenna with parallel LC-circuits loads. Radiotekhnika. 2022. V. 86. № 5. P. 145−157. DOI: https://doi.org/10.18127/j00338486-202205-17 (In Russian)

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