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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
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Below are all of the forum threads, including all the responses to the original posts. Qacer Post subject: Gain and bandwidth Unread postPosted: Thu Apr 28, 2005 1:11 am Offline Captain Joined: Sat Apr 23, 2005 2:09 pm Posts: 17 Location: Tampa, FL Hi all, I was just reading the Pozar book and on p.553 it mentions that "it is preferable to design for less than the maximum obtainable gain to improve bandwidth." Is there a formal derivation to this statement? I'm curious why. Thanks! Top Profile Jeanalmira Post subject: Unread postPosted: Thu Apr 28, 2005 1:25 am Offline General User avatar Joined: Tue Mar 15, 2005 11:43 pm Posts: 65 Location: Singapore Hi, I think it's related to this condition "Gain-Bandwidth is equal to constant", which derived from Bode-Fano Theorem. Therefore, by designing for less than the maximum obtainable gain, wider bandwidth will be obtained. Thanks and Regards, Jean Top Profile Guest Post subject: Unread postPosted: Mon May 02, 2005 1:30 pm The last post is absolutly correct. Fanos limit shows that for wider bandwidth, the gain will be reduced. Top Guest Post subject: Unread postPosted: Tue May 03, 2005 8:49 am Aint Bode-Fano's criterion showing the VSWR-bandwidth product that a matching network can have for a given quality factor mostly for passive devices shuch as antenas? I always had the impession that remplacing VSWR by GAIN was an oversimplification. In my mind it only work as stated if the device in unilateral. Second, what is this GAIN-Bandwitdh tradeoff? What gain? A flat gain or the Maximum available gain over frequency, whatever value or rolloff it shows? Very often people will design matching network to autocompensate the gain rolloff and obtain a flat response, by sacrificing the VSWR. I see Bode-Fano as a good starting point to sea if a matching is feasable. Top Guest Post subject: Unread postPosted: Tue May 03, 2005 11:43 am You are correct , it is a criterion for passive networks. The matching networks are passive, therfore, the wider the bandwidth the higher the loss, hence lower gain. Posted 11/12/2012 | ||||||
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