From: xiu4126 <xi...@ya...> - 2011-08-19 15:10:11
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Hi, colleague, Attachment is an example of a schematic that includes coupled transmission line. It's just a coupled transmission line and 4 power sources connected simply. I expect that all S parameters are not greater than 0dB. (typically, S11<-30dB, S21=-3dB, S31<-30dB, S41=-3dB. ) But the result of simulation are, S parameters are over +0dB. I'ts strange that a possive circuit have a power gain. On the other side, using Coupled Microstrip Line instead goes well. I wonder if it's a bug ,or just my misuse. Sincerely, Osamu |
From: Carsten K. <cko...@cb...> - 2011-08-25 08:52:18
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please paste your schematic file in your email, as the list does not support attachments. Carsten ----- Original Message ----- From: "xiu4126" <xi...@ya...> To: quc...@li... Sent: Friday, August 19, 2011 5:10:02 PM Subject: [Qucs-help] bug in coupled transmission line component? Hi, colleague, Attachment is an example of a schematic that includes coupled transmission line. It's just a coupled transmission line and 4 power sources connected simply. I expect that all S parameters are not greater than 0dB. (typically, S11<-30dB, S21=-3dB, S31<-30dB, S41=-3dB. ) But the result of simulation are, S parameters are over +0dB. I'ts strange that a possive circuit have a power gain. On the other side, using Coupled Microstrip Line instead goes well. I wonder if it's a bug ,or just my misuse. Sincerely, Osamu ------------------------------------------------------------------------------ EMC VNX: the world's simplest storage, starting under $10K The only unified storage solution that offers unified management Up to 160% more powerful than alternatives and 25% more efficient. Guaranteed. http://p.sf.net/sfu/emc-vnx-dev2dev _______________________________________________ Qucs-help mailing list Quc...@li... https://lists.sourceforge.net/lists/listinfo/qucs-help |