Journal of Radio Electronics. eISSN 1684-1719. 2025. ¹11
Full text in Russian (pdf)
DOI: https://doi.org/10.30898/1684-1719.2025.11.31
ANTENNAS CHARACTERISTICS LOADED WITH REFLECTIVE
AND NON-REFLECTIVE FREQUENCY-SELECTIVE CIRCUITS
N.D. Malyutin, M.O. Konovalenko, G.A. Malyutin,
A.A. Arutyunyan, E.I. Trenkal, T.A. Chepko
Tomsk State University of Control Systems and Radioelectronics
634050, Tomsk, Lenin Ave., 40
The paper was received July 29, 2025.
Abstract. Using a compact microstrip broadband antenna designed for use in small-sized UAVs as an example, the features of its characteristics depending on the frequency properties of the loads are investigated. Three load options are considered: in the form of a matched circuit; a band-pass reflective filter; a band-pass non-reflective filter. The frequency characteristics of the microwave path consisting of an antenna, a band-pass reflective or non-reflective filter, and a signal source/receiver in the radiation and backscatter modes during antenna irradiation are studied. It is found that when irradiating an antenna loaded with a reflective filter, an increase in the effective scattering cross-section (RCS) is observed at individual frequencies due to the effect of re-reflection of out-of-band frequencies from the load. Replacing the reflective filter with a non-reflective one with a single passband leads to a decrease in the RCS. In this case, the frequency dependences of the reflection coefficient, directivity pattern, RCS and gain in the first passband are close to the parameters obtained using a traditional reflective filter. At frequencies outside the passband with broadband irradiation of the antenna, along with a decrease in the RCS, an effect of suppression of parasitic passbands of the microwave receiving path is observed due to the absorption of microwave oscillation energy in the buffer resonant circuit of the non-reflective filter. In this case, the load in the form of a non-reflective filter is matched both at the input and between the antenna and the filter.
Key words: antenna, antenna loads, reflective filter, non-reflective filter, effective scattering cross section.
Financing: The study was carried out with the financial support of the Ministry of Science and Higher Education of the Russian Federation, project FEWÌ-2013-0014 dated 16.01.23.
Corresponding author: Malyutin Nickolay Dmitrievich. ndm@main.tusur.ru
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For citation:
Malyutin N.D., Konovalenko M.O., Malyutin G.A., Arutyunyan A.A., Trenkal E.I., Chepko T.A. Antennas characteristics loaded with reflective and non-reflective frequency-selective circuits // Journal of Radio Electronics. – 2025. – ¹. 11. https://doi.org/10.30898/1684-1719.2025.11.31 (In Russian)