Journal of Radio Electronics. eISSN 1684-1719. 2026. №7

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DOI: https://doi.org/10.30898/1684-1719.2026.7.1

 

 

 

MODIFICATION OF A COMBINED UWB ANTENNA

USING CHARACTERISTIC MODE ANALYSIS

 

Yu.A. Andreev, V.P. Belichenko, V.V. Plisko

 

Institute of High Current Electronics SB RAS,

634055, Russia, Tomsk, Akademichesky ave., 2/3

 

The paper was received June 3, 2021.

 

Abstract. A process for modifying a 3D UWB combined antenna based on an analysis of its characteristic modes is presented. This begins with an investigation of the characteristic modes properties of the combined antenna's main components, followed by the characteristic modes properties of the antenna as a whole, with the goal  of developing a concept for effectively widening its operating bandwidth. To do this, the key attributes of characteristic mode theory are analyzed in the frequency domain–the frequency dependences of characteristic angles and modal significances  and the distributions of characteristic currents for these modes are visualized. This allowed us to obtain valuable information on the contribution of the most significant characteristic modes to the antenna's radiated power and, based on a thorough analysis of the mode current distributions in the vicinity of the antenna's feed input, propose  a productive principle for widening its operating frequency band. This principle was embodied in the design of an experimental model of a modified combined UWB antenna. The results of full-wave modeling of the antenna model and measurements  of its parameters and characteristics are in good agreement. The antenna operating frequency range at VSWR < 2 is 0.5 – 2.75 GHz. The modified antenna has a higher gain than the original antenna across virtually the entire operating frequency band. Its greatest increase is observed in the range from 1.9 to 2.8 GHz. The effective radiation potential rE_p of the modified antenna is 9 % (in the experiment) and 11 %  (in full-wave modeling) higher than the corresponding value for the original combined antenna.

Key words: characteristic mode, combined antenna, ultra-wideband antenna, TEM horn, frequency and time domain analysis, antenna operating bandwidth.

Financing: the work was supported by the Ministry of Science and Higher Education of the Russian Federation (FWRM-2026-0011).

Corresponding author: Andreev Yury Anatol’evich, lhfehcei@yandex.ru

 

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For citation:

Andreev Yu.A., Belichenko V.P., Plisko V.V. Modification of a combined UWB antenna based on an analysis of its characteristic modes // Journal of Radio Electronics. – 2026. – №. 7. https://doi.org/10.30898/1684-1719.2026.7.1 (In Russian)