"JOURNAL OF RADIO ELECTRONICS" (Zhurnal Radioelektroniki ISSN 1684-1719, N 3, 2018

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Research of multibeam lens antenna with frequency-independet radiation characteristics

 

N. I. Bobkov, S. S. Ivakina, V. V. Prozhivalsky

Stock Company “All-Russia Scientific-Research Institute “Gradient”, Sokolova 96, Rostov-on-Don 344010, Russia

 

The paper is received on February 1, 2018, after correction - on March 4, 2018

 

Abstract. For cylindrical multi-beam lens antennas, a method for the formation of frequency-independent radiation characteristics in a wide frequency band is proposed. The method is based on the choice of the aperture configuration, forming the decreasing amplitude distribution of an equivalent linear radiator and introducing an additional frequency-dependent quadratic phase aperture distribution, formed by defocusing the lens. In this case, the decrease in the width of the pattern with increasing frequency is compensated by an increase in the dephasing of the aperture. The electrodynamic simulation confirmed the possibility of stabilizing the width of the partial patterns of the lens antenna in the frequency range with overlap of 2.25: 1. The prototype of the lens antenna is made of polystyrene and includes seven sectorial horns irradiators. Amplitude excitation in the aperture of the lens, given by the horns, is practically uniform. Using an absorbing diaphragm of a special shape mounted on the illuminated side of the lens, an amplitude distribution of an equivalent linear radiator of the form "cosine in square" with a pedestal Δ = 0.2 is formed in its aperture. The prototype of a multibeam lens antenna, forming seven beams in the sector ± 18º, was tested. The experimental values ​​of the width of the partial-beam patterns in the frequency band are 5.45° with a maximum deviation of ± 0.85°, while maintaining a stable level of intersection of the partial patterns and the steepness of the direction-finding characteristics. The relative level of intersection of partial patterns is 3 ± 1 dB. The proposed method for constructing broadband multi-beam lens antennas with frequency-independent radiation characteristics can be used in the development of antenna systems for various purposes.

Key words: lens antenna, amplitude-phase distribution, radiation pattern.

References

1. Bobkov N.I., Gabriel’an D.D., Ivakina S.S., Parkhomenko N.G. The design of aperture antennas with frequency independent radiation characteristics. Radiotekhnika - Radio Engineering, 2016, No. 1, pp. 42-49.

2. U.S. Patent 3404405. Luneburg lens with staggered waveguide feed. W.J. Young, Jr. Oct. 1. 1968.

3. Koch G.F. Flachenstrahler mit kleinen Nebenmaxima. Fernmeldetech. Z., 7 (1954), S. 498-509.

4. Zelkin E.G., Petrova R.A. Linzovye antenny [Lens antennas]. Moscow, Sovetskoe radio Publ., 1974, 280 p.

5. Gorin A.M., Radchenko N.A. Scanning array antenna with stable radiating pattern in the wide frequency band. Voprosy specialnoy radioelektroniki (nauchno-tekhnichesky sbornik) - Questions of special radio electronics (scientific and technical collection), No. 1, Moscow-Taganrog, 2014, pp. 77-80.

6. Bobkov N.I., Gabriel’an D.D., Ivakina S.S., Prozhivalsky V.V. Investigation of a frequency-independent radiation characteristics of circular aperture antennas. Radiotekhnika - Radio Engineering, 2016, No. 11, pp. 170-176.

For citation:
 

N. I. Bobkov, S. S. Ivakina, V. V. Prozhivalsky. Research of multibeam lens antenna with frequency-independet radiation characteristics. Zhurnal Radioelektroniki - Journal of Radio Electronics. 2018. No. 3. Available at http://jre.cplire.ru/jre/mar18/1/text.pdf.