Hi, I need some professional comments on filter design, does anyone tell me what is the major method applied to design a high frequency filter, say center f between 1GHz and 10 GHz. As I read Reinhold Ludwig's "Rf circuit design", he explains the methodolgy of filter design as receipe-cooking, all kinds of filters can be implemented based on basic lowpass filter, such as Butterworth, Chebyshev filter, with frequency and L/C transformation. Furthermore, we can use unit elements and Kuroda's identities to implement RF filter design. Is this a real practical method in RF circuit design? If not, which one do you use? Can you give me some detail information? Thanks for your help! wei zhang ------------------------------------------------------------------ To unsubscribe from si-list: si-list-request@xxxxxxxxxxxxx with 'unsubscribe' in the Subject field or to administer your membership from a web page, go to: //www.freelists.org/webpage/si-list For help: si-list-request@xxxxxxxxxxxxx with 'help' in the Subject field List archives are viewable at: //www.freelists.org/archives/si-list or at our remote archives: http://groups.yahoo.com/group/si-list/messages Old (prior to June 6, 2001) list archives are viewable at: http://www.qsl.net/wb6tpu