• Українська
  • English
  • Русский
ISSN 2415-3400 (Online)
ISSN 1028-821X (Print)

Directional radiation properties of two impedance monopoles mounted on a perfectly conducting rectangular screen

Yeliseyeva, NP, Berdnik, SL, Katrich, VA

V.N. Karazin Kharkiv National University
4, Svobody Sq., Kharkiv, 61022, Ukraine
Е-mail: nadezhda.p.yeliseyeva@karazin.ua

Language: ukranian

Subject and Purpose. Two impedance resonant monopoles of electric length 0.2 £ l / l £ 0.3 are mounted on a rectangular screen perpendicularly to the screen surface and studied for the directional radiation properties (directive gain and radiation patterns) depending on the monopole separation and the side length and aspect ratio of the screen.

 Methods and Methodology. A three-dimensional diffraction vector problem of two impedance monopoles mounted on a perfectly conducting rectangular screen is solved in terms of the uniform geometric theory of diffraction. Allowances are made for the diffracted field asymptotics of the secondary diffraction at the screen edges and for the electric current distribution asymptotics of a thin impedance dipole in the free space.

Results. For a lattice of two impedance monopoles mounted on a rectangular screen, 3-D programs have been developed for calculating its radiation patterns, directive gain Dmax at a radiation maximum, and radiation resistance in view of the secondary diffraction at the screen edges. The radiation pattern shaping for the diffraction and total fields and the directive gain Dmax have been analyzed depending on the monopole separation x / l  0.1...1, the screen side length x / l  1.2…4, and the screen aspect ratio W / L  0.5…3. It has been shown that the so obtained optimum separation x opt  0.65, optimum length Lopt and optimum ratio (W / L) opt make Dopt three times greater than the lowest Dmax value.

Conclusions. The three-dimensional vector problem of field diffraction of two impedance monopoles mounted on an ideally conducting rectangular screen has been solved. It is of interest that given an optimum monopole separation xopt and an optimum side length Lopt of the square screen, a lattice of two monopoles offers a greater radiation resistance and a two times larger Dopt than a single monopole on the same screen does. The developed computational programs and the obtained numerical results enable efficient actual wireless communication systems to be modelled for both ideally conducting and impedance resonant monopoles.

Keywords: diffracted field, directive gain, impedance monopole, radiation pattern, radiation resistance, rectangular screen, surface impedance

Manuscript submitted 08.026.2021
Radiofiz. elektron. 2021, 26(2): 54-66
Full text (PDF)

1. Yeliseyeva, N.P., Berdnik, S.L., Katrich, V.A., 2020. Resonant properties of an impedance monopole located on a perfectly conducting rectangular screen. Radiofiz. Elektron., 25(3), pp. 3-15 (in Ukraine). DOI: https://doi.org/10.15407/rej2020.03.003
2. Yeliseyeva, N., Berdnik, S., Katrich, V., 2020. Analysis of Directional Properties of Radiation of Impedance Monopole Located on Finite Size Screen. In: Proc. 2020 IEEE Ukrainian Microwave Week (UkrMW), Kharkiv, Ukraine, 21-25 Sept. P. 217-221. DOI: https://doi.org/10.1109/UkrMW49653.2020.9252675
3. Balanis, C.A., 2016. Antenna Theory: Analysis and Design. John Wiley & Sons, Inc.
4. Burghignoli, P., Lovat, G., Araneo, R., and Celozzi, S., 2018. Time-domain shielding of a thin conductive sheet in the presence of vertical dipoles. IEEE Trans. Electromagn. Compat., 60(1), pp. 157-165. DOI: https://doi.org/10.1109/TEMC.2017.2702560
5. Naser-Moghadasi, M., Rousta, H., and Virdee, B.S., 2009. Compact UWB Planar Monopole Antenna. IEEE Antennas Wirel. Propag. Lett., 8, pp. 1382-1385. DOI: https://doi.org/10.1109/LAWP.2009.2039111
6. Karandikar, Y., 2010. Pattern studies of two parallel dipoles above ground plane in eleven configuration as feed for reflector antenna. IEEE Antennas Wirel. Propag. Lett., 9, pp. 558-561. DOI: https://doi.org/10.1109/LAWP.2010.2051657
7. Yeliseyeva, N., Berdnik, S., Katrich, V., 2021. The Radiation Characteristics of Two Coupled Vertical Dipoles with a Finite Size Screen. In: Ilchenko M., Uryvsky L., Globa L. (eds), 2021. Advances in Information and Communication Technology and Systems. MCT 2019. Lecture Notes in Networks and Systems. Springer, Cham. Vol. 152. P. 342-358. DOI: https://doi.org/10.1007/978-3-030-58359-0_19