V.O. Fadeev1, A.O. Afonin2, T.Yu. Shumilov3

1-3 JSC “Scientific Production Enterprise “Radiosviaz” (Krasnoyarsk, Russia)
1 viafad98@gmail.com; 2 afoninao@iph.krasn.ru; 3 shtu@krtz.su

This article examines the thermal stability of bandpass filters based on various physical principles. The following parameters are measured: group time delay ripple, transmission coefficient, center frequency and bandwidth. Thermal stability of listed parameters are crutial for global navigation satellite systems. A change in groput time delay by just 1 ns results a 30 cm error in pseudorange. Therefore, the search for filters with the lowest dependence of these parameters on ambient temperature is crucial. Hence, the goal of this study is to draw conclusion about the suitability of the studied filters for global navigation satellite system based on the obtained data. Objective: conduct a series of measurements of the S-parameters and group time delay for filters at ambient temperature ranging from -60 ℃ to +85 ℃. Measurements were conducted in a Mir oborydovania M-70/100-81- KTX climate chamber using a Keysight PNA-X N5245B vector network analyzer.

Two microstrip filters third and sixth order manufactured by JSC “NPP “Radiosvyaz”, filter based on dielectrical resonators manufactured by JSC “RI “ Ferrit-domen”, filter based on surface acoustic waves manufactured by LLC “AEK” are examined in this work.

Based on the data obtained during the study, it can be concluded that the M44815 filter and microstip filter #1 manufactured by JSC “NPP “Radiosvyaz” are thermally stable. The microstip filter exhibits the smallest deviation of the studied parameters, with the exception of the center frequency, but it should be noted that the passband width is nearly double that the other filters under the study. It is also worth noting that the group delay deviation at boundary temperatures is only 0.12 ns, with an average value of 2.34 ns. The M44815 filter has an average group delay ripple of 10,43 ns, with a deviation of 1,1 ns at boundary temperatures.The AE55100H filter turned out to be the most sensitive to temperature, witch should be taken into account when using it in devises and additional thermal stabilization circuits should be applied, when small dimensions and weight are important.

Fadeev V.O., Afonin A.O., Shumilov T.Yu. Comparative analysis of bandpass filters for global navigation satellite systems. Achievements of modern radioelectronics. 2026. V. 80. № 3. P. 140–145. DOI: https://doi.org/10.18127/j20700784-202603-16 [in Russian]

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