A.O. Afonin1, I.V. Govorun2, Al.A. Leksikov3, A.V. Ugryumov4

1-4 Kirensky Institute of Physics SB RAS (Krasnoyarsk, Russia)

2 Reshetnev Siberian State University of Science and Technology (Krasnoyarsk, Russia) 1,4 JSC «NPP «Radiosvyaz» (Krasnoyarsk, Russia)

1 nord2492@mail.ru; 2 govorun-ilya@mail.ru; 3 leksikov@iph.krasn.ru; 4 dark24@bk.ru

This article describes the development of a miniature monolithic broadband microwave bandpass filter fabricated using multilayer printed circuit board technology. Bandpass filters are among the most important components of modern radio engineering systems, including communications, radio navigation, radar, instrumentation, and other systems. Filters determine the electrical, weight, and size characteristics of the final product. Therefore, it is an urgent task to develop filter designs that have high frequency-selective properties and small size and weight. In this paper, we study the dependence of the maximum fractional bandwidth of a two-section structure on the number of dielectric layers and the width of the resonator strips. It is shown that decreasing the number of layers and the width of the resonator strips leads to an increase in the fractional bandwidth of the filter. Thus, when the number of layers increases from 3 to 9, the maximum fractional bandwidth decreases from 90% to 38% for a filter with a resonator conductor width of 0.6 mm. At the same time, the longitudinal size of the filter decreases, leading to its miniaturization.

Based on the obtained results, a fourth-section bandpass filter was designed and manufactured. The filter is a monolithic structure with seven dielectric layers. The conductor width of the outer resonators is 0.6 mm. The filter has a fractional bandwidth of 32.1% and a center frequency of 401.8 MHz. The high-frequency stopband at -40 dB extends to 11f0. The filter dimensions are 13.5´20.1´6.7 mm, and the device weighs only 1.5 g.

Afonin A.O., Govorun I.V., Leksikov Al.A., Ugryumov A.V. Miniature monolithic filter with wide bandwidth. Achievements of modern radioelectronics. 2026. V. 80. № 3. P. 8–15. DOI: https://doi.org/10.18127/j20700784-202603-02 [in Russian]

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