Yury V. Medvedev¹, Oleg V. Nazarov², Alina O. Perfilova³, Oleg Yu. Perfilov4, Valeriy V. Chelnokov5, Radik Sh. Shakurov6 1, 2, 4–6
Federal State Budgetary Institution «16-th Central Scientific Research and Testing Institute» of Ministry of Defense of the Russian Federation (Mytishchi, Russia)
Moscow Technical University of Communications and Informatics (Moscow, Russia) 1,2,3
Due to the need to provide radio communication in the short-wave (HF) range when it is impossible to deploy antenna-mast devices and install antennas on them, it is advisable to use creeping antennas that do not require significant deployment time and space for their placement. Such antennas must have directional characteristics that provides radio communication with ionospheric waves (layer F2 at an altitude of 400 km, day time) coming at elevation angles relative to the horizon Θ = 45°...80° for correspondents located at a distance of up to 700 km from each other, Θ = 20°...45° for correspondents at a distance of 700…2000 km, and Θ ≤ 20° when the distance between correspondents is more than 2000 km for single-jump routes.
A parallel-powered creeping antenna is a parallel-powered vibrator consisting of two L-length arms. Power supplies are introduced at two points, at a distance of -l and l from the middle of the vibrator, which is located at the point l = 0. These vibrators are made of insulated wire or RF cable.
Using the widely used method of moments, the input resistances of vibrators have been calculated, the frequency overlap range has been determined, the distance l from the center of the vibrators at which power sources are located has been selected, and the antenna gain and pattern of antennas for the earth with the parameters ɛr = 7, σ = 0.001 Cm/m have been calculated.
As shown by the results of calculations, a creeping antenna with parallel power supply has a frequency overlap range 1.6 times greater than an antenna with a single power point. Also, an antenna with parallel power supply is 2–3 times more efficient than an antenna with a single power point, since it has higher antenna gain values.
Changes in the radiation level in the frequency range 2...7.5 MHz in the sector of angles adjacent to the zenith for the creeping antenna are insignificant, which indicates the possibility of using an antenna with parallel power on radio lines up to 700 km long. In the horizontal plane, the creeping antenna mainly radiates in the direction perpendicular to its axis.
The considered design of a parallel-powered HF creeping antenna is a weakly directional zenith radiation antenna which allows radio stations to operate in a wider frequency range with better electrical characteristics compared to existing creeping antennas.
- Lavrov G.A., Knyazev A.S. Prizemnye i podzemnye antenny. M.: Sov. radio. 1965. S. 292–297. (in Russian)
- Red E.T. Spravochnoe posobie po vysokochastotnoj skhemotekhnike: Skhemy, bloki, 50-omnaya tekhnika: Per. s nem. S.N. Shibalova pod red. Yu.A. Lur'e. M.: Mir. 1990. S. 190. (in Russian)
- Shchelkunov S.A., Friis G.T. Antenny: Teoriya i praktika: Per. s angl. pod red. L.D. Bakhrakha. M.: Sov. radio. 1955. S. 240. (in Russian)
- Burke G., Poggio A. Numerical electromagnetics code – method of moments. Technical Report UCID-18834. Lawrence Livermore National Laboratory. 1981.
- Krasutskij N.M., Medvedev Yu.V., Perfilov O.Yu., Chelnokov V.V. Kombinirovannaya shirokopolosnaya antenna KV-diapazona. Antenny. 2018. № 9. S. 10–15. DOI: 10.18127/j03209601-201809-02. (in Russian)