xbtxbt
Member level 2
broadband microstrip filter
I want to design a broadband(50%) bandpass filter with a 1mm thick FR4 board at the center frequency of 600MHz. First,I used the interdigital model.But the S11 was very poor.I can only lay out the microstrip filter on a Maximum area of 10cm X 10cm.So I can't use 1/4 wavelength stub model.the hairpin and combline model can be only applied to narrow band filter.Can anybody help me?TKS very much!
I want to design a broadband(50%) bandpass filter with a 1mm thick FR4 board at the center frequency of 600MHz. First,I used the interdigital model.But the S11 was very poor.I can only lay out the microstrip filter on a Maximum area of 10cm X 10cm.So I can't use 1/4 wavelength stub model.the hairpin and combline model can be only applied to narrow band filter.Can anybody help me?TKS very much!