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| Wideband Filter - RF Cafe Forums | ||||||
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Because of the high maintenance needed to monitor and filter spammers from the RF Cafe Forums, I decided that it would
be best to just archive the pages to make all the good information posted in the past available for review. It is unfortunate
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Below are all of the forum threads, including all the responses to the original posts. Antonio Post subject: Wideband Filter Posted: Tue Nov 27, 2007 6:42 am Captain Joined: Sat Jun 16, 2007 12:26 am Posts: 12 Can anyone tell me: Why the Return Loss performance is poor in Wideband Filters? Or Why is it difficult to get good Return Loss performance in Wideband Filters? Top IR Post subject: Posted: Tue Nov 27, 2007 4:01 pm Site Admin Joined: Mon Jun 27, 2005 2:02 pm Posts: 373 Location: Germany Hi Antonio, Wideband filters are those with a BW>10% of the center frequency The reason for that is the same as why it is hard to design a wideband filter with low insertion loss. When you design a wideband filter, more resonators are required which increase the insertion loss and thus the return loss. Top Antonio Post subject: Posted: Thu Nov 29, 2007 6:49 am Captain Joined: Sat Jun 16, 2007 12:26 am Posts: 12 Hi IR, Thanks for your reply.. Can you please explain it with the help of circuits? A circuit containing combination of L and C and some tank circuits. Top IR Post subject: Posted: Sat Dec 01, 2007 12:16 pm Site Admin Joined: Mon Jun 27, 2005 2:02 pm Posts: 373 Location: Germany Hi Antonio, The following article mentions this issue. It describes distributed (printed) filters. The principle is the same for both distributed and lumped filters. http://www.eng.jcu.edu.au/Staff/Profile ... 81-Fil.pdf Top Jeanalmira Post subject: Posted: Mon Dec 24, 2007 9:25 pm General Joined: Tue Mar 15, 2005 11:43 pm Posts: 65 Location: Singapore Hi Antonio, I agree with the above posts. But keep in mind that by adding more resonators, there will be more insertion loss resulted. The difficulty in getting good Return Loss performance in Wideband Filters is somehow related to the Q concept. It depends how good you want the performance is. The smaller insertion loss and the higher return loss require higher Q, which means it will give sharper response. I hope it helps. Regards, Jean Posted 11/12/2012 | ||||||
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