THE METHOD OF ADJUSTING THE AMPLITUDE-FREQUENCY CHARACTERISTICS OF FILTERS
Dmitry N. Novomeisky, Mikhail N. Piganov, Anton A. Luptsov, В. П. Перевертов · Reliability and Quality of Complex Systems · 2024
Background. The relevance of the topic of this work is due to the need to reduce the level of penetrating interference and improve the quality of the useful signal received by the on-board active interference station. Goal – improving the quality and functional parameters of on-board frequency-selective systems and structures by adjusting the amplitude-frequency characteristics of filters. Materials and methods. The system analysis of the main parameters, modeling of the frequency characteristics of attenuation and the standing wave voltage coefficient, expert assessments, and research tests were used. The system analysis of the main parameters, modeling of the frequency characteristics of attenuation and the standing wave voltage coefficient, expert assessments, and research tests were used. To improve the characteristics of the filters, it is proposed to adjust (adjust) the amplitude-frequency characteristics of the filters. The schemes and topologies of correctors are given. It is shown that with the help of thin-film and thick-film correctors, various frequency response distortions can be eliminated, the slope of the characteristic can be adjusted, and the depth of the frequency response dip can be changed. Results. The proposed schemes, designs and topologies of correctors allow you to adjust the slope of the characteristics up to 16dB, change the depth of their failure, maintain VSWR within 1.35...2.5 in the operating frequency range, reduce the frequency response unevenness to 0.2 dB, and the noise factor to 2.3...2.4 dB. To ensure such a level of performance during the adjustment process, it is required to carry out an individual combined adjustment of the resistors in the range of –10...+30 % or functional – according to a template. At the same time, the flare discharge method provides a higher time stability of the frequency response adjustment indicators and a higher yield of suitable products compared to the laser method. Conclusions. The proposed method of adjusting the amplitude-frequency characteristics of the filters of the frequency-selective system makes it possible to improve the quality of the useful signal received by the active interference station. Adjusting the frequency response by adjusting the resistors of the corrector resistors by the flare discharge method provides a higher time stability of the parameters than with laser adjustment.