Journal of Radio Electronics. eISSN 1684-1719. 2026. №5
Full text in Russian (pdf)
DOI: https://doi.org/10.30898/1684-1719.2026.5.13
WIDEBAND MICROSTRIP ANTENNA
BASED ON A RECTANGULAR RADIATOR
WITH A U-SHAPED SLOT
N.A. Gilev, D.A. Myasnikov, Yu.N. Parshin, O.I. Biryukov
Scientific and Production Association «Almaz» named after Academician A.A. Raspletin,
125190, Russia, Moscow, Leningradsky Prospekt, 80, bld. 16
The paper was received April 20, 2026.
Abstract. The article presents the development and study of a single wideband microstrip antenna for the X-band. The aim of the work is to create a printed radiating structure that provides a wide operating frequency band while maintaining acceptable radiation characteristics. To achieve this goal, the baseline topology of a rectangular patch was modified by introducing a U-shaped slot and a truncated ground plane, and the geometric dimensions were normalized to the central value of the wavelength. The analysis of electrodynamic characteristics was performed using three-dimensional electromagnetic simulation, parametric optimization, and equivalent circuits. The ultimate matching capabilities were evaluated using the Bode-Fano integral criterion. Simulation results demonstrate that the proposed configuration allows extending the fractional operating bandwidth by a factor of 4.7 compared to the baseline rectangular radiator (from 8.7 % to 41.0 % at a voltage standing wave ratio level of ≤ 1.7). The absolute operating band of the modified antenna at the specified level was 7.94-12.02 GHz. It is shown that the proposed structure possesses a 1.8 times larger integral matching resource and effectively redistributes it within the operating frequency band, realizing 62 % of the available potential versus 27 % for the prototype. To suppress parasitic mode components and prevent the degradation of the radiation pattern at the upper frequencies of the band, two metallized vias were introduced into the design. This solution made it possible to keep the direction of maximum radiation close to the normal and ensure a gain within the range of 2.74-6.33 dB with predominantly linear polarization. The developed topology can be considered a convenient baseline configuration for designing similar structures in other frequency bands.
Key words: microstrip antenna, rectangular radiator, U-shaped slot, wideband antenna, multilayer substrate, metallized vias, Bode-Fano criterion.
Corresponding author: Gilev Nikita Andreevich, nikitagiliyov@gmail.com
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For citation:
Gilev N.A., Myasnikov D.A., Parshin Yu.N., Biryukov O.I. Wideband microstrip antenna based on a rectangular radiator with a U-shaped slot. // Journal of Radio Electronics. – 2026. – №. 5. https://doi.org/10.30898/1684-1719.2026.5.13 (In Russian)