СALCULATION TECHNIQUE AND EXPERIMENTAL INVESTIGATION OF HIGH FREQUENCY CRYSTAL FILTER
DOI:
https://doi.org/10.18372/2310-5461.24.7514Keywords:
crystal filter, bandwidth, central frequency, attenuation in delay band, high frequency filter, filter parameters calculation, Butterworth filterAbstract
A methodology of high frequency crystal filter design with specified parameters, such as central frequency, bandwidth on 3 - dB level, attenuation in delay band, attenuation in passband, attenuation of signal generator second harmonic, is provided. A calculation of filter parameters on central frequency 25 MHz, with the bandwidth 15 kHz, attenuation in delay band more than 30 dB, attenuation in passband less than 4.5 dB, attenuation of signal generator second harmonic more than 30 dB was made. The effectiveness of developed filter, due to construction and practical use in module of operating radar, was proved. Furthermore, two kinds of filter: with external elements and with surface-mounted ones, were built and their characteristics compared.
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