Full Member level 2
I am wondering if it is possible to design a filter using low Q resonator (say 20) to achieve good IL (say 3dB). I saw some paper using low Q L (8,eight) and C build filter with IL of 2.5dB. But I saw some textbook claims if the Q is bad the filter using coupled resonators will have big IL. I don't know if that is true for all filters, and what is the relationship between Q and IL.