Measuring Filter Characteristics Using the SSA3000X Plus / SSA3000X-R / SVA1000X Spectrum Analyzer
https://siglentna.com/application-note/measuring-filter-characteristics-using-the-ssa3000x-plus-ssa3000x-r-sva1000x-spectrum-analyzer/
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One more thing,we also have to consider the input/output impedance of the filter.If the impedance is 50ohm,the above description is correct.