Steve, I'm very glad to receive your reply and have learnt a lot from your = papers issued on DesignCon. I know increasing ESR and decreasing inductance can lower Qs which decreases the resonance and makes the impedance smooth. What I meant is that, for the same plane pair structure with the same capacitors, when I set the number of modes and simulate, I will get = datas of different mode such as Mode 1, Mode2 and so on. According to the figure of the result, it seems that Mode 1 shows the resonance from horizontal angle, Mode 2 from vertical angle, Mode 3 = from diagonal angle, etc. Different mode analyzes the resonance from = different angle. As my last mail said, every mode has a certain frequency and Q = increases with the number of modes and corresponding frequency in term of the = result. Mode 1 is the lowest frequency among all. Therefore, with the = increasement of the number of modes, more resonant frequency will appear. You mean, I only pay attention to the bandwidth of significant signal = which may excite the resonance. Ok, I see. My following question is, why do Qs increase with the number of modes = and frequency for the same cavity and PDN? Which imformation will I obtain from Qs?=20 For Q indicates the ratio of storage and loss, does it mean larger = number of Mode with higher resonant frequency will let more energy pass? Best Regards Zhengrong Xu -----=D3=CA=BC=FE=D4=AD=BC=FE----- =B7=A2=BC=FE=C8=CB: si-list-bounce@xxxxxxxxxxxxx = [mailto:si-list-bounce@xxxxxxxxxxxxx] =B4=FA=B1=ED steve weir =B7=A2=CB=CD=CA=B1=BC=E4: 2007=C4=EA8=D4=C229=C8=D5 14:02 =CA=D5=BC=FE=C8=CB: xuzhengrong@xxxxxxxxxx =B3=AD=CB=CD: si-list@xxxxxxxxxxxxx =D6=F7=CC=E2: [SI-LIST] Re: Resonant Modes Zhengrong, Pay attention to the resonances that are within the bandwidth of = significant signal energy from your loads and/or injected into your return path. Q depends on the capacitors and materials you use for your PCB. Low = mounted inductance capacitors such as X2Ys exhibit lower Qs than capacitors with higher mounted inductances and similar ESRs. Cavities that are thinner and/or have higher tangent losses exhibit = lower Qs than do thicker cavities and/or cavities with lower tangent loss. At the end of the day you are always fighting inductance in your = capacitors and interconnect. You can manipulate modes and Q by manipulating your capacitors and cavity geometries. Steve. xuzhengrong wrote: > Oh, I am so sorry for that.=3D20 > I have sent another email in text format, but i don't know why it =3D = > hasn't been sent to all yet. > When I sent to si-list@xxxxxxxxxxxxx, i received several autoreplies = > =3D for their out of office.=3D20 So I sent both to = si-list@xxxxxxxxxxxxx=20 > and =3D si-list-bounce@xxxxxxxxxxxxx this time. > I'm new here and very glad to join in.=3D20 Could you tell me the=20 > relationship between si-list@xxxxxxxxxxxxx and=20 > si-list-bounce@xxxxxxxxxxxxx? When i want to join the discussion,=20 > which =3D mail address will i send to? > > Thank you for your reminder with best regards.=3D20 My question is=20 > listed as follows. > > > Hi all, > I am new in using EM tools to analyze the plane pairs' resonance. > After inputing the number of modes and computing, the results have =3D = > several values including freqency and Q. Every mode has a certain=20 > frequency and =3D Q increases with the number of modes.=3D20 =3D20 = Which=20 > mode should i pay most attention to? > Why does Q value increase with the number of modes and frequency? > How to analysze with these data and which information can i obtain=20 > from =3D it? > =3D20 > Appreciate any idea about that. > =3D20 > Best Regards > Zhengrong Xu > > > > -----=3DD3=3DCA=3DBC=3DFE=3DD4=3DAD=3DBC=3DFE----- > =3DB7=3DA2=3DBC=3DFE=3DC8=3DCB: olaney@xxxxxxxx = [mailto:olaney@xxxxxxxx]=3D20 > =3DB7=3DA2=3DCB=3DCD=3DCA=3DB1=3DBC=3DE4: = 2007=3DC4=3DEA8=3DD4=3DC229=3DC8=3DD5 12:00 > =3DCA=3DD5=3DBC=3DFE=3DC8=3DCB: xuzhengrong@xxxxxxxxxx > =3DD6=3DF7=3DCC=3DE2: Re: [SI-LIST] Resonant Modes > > Just so you know what I actually received... > I think jpg files need to be sent as attachments. > > On Wed, 29 Aug 2007 11:02:59 +0800 xuzhengrong = <xuzhengrong@xxxxxxxxxx> > writes: > =20 >> Content-type: text/plain; charset=3D3Dgb2312 >> Content-transfer-encoding: 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Subject field >> =3D20 >> or to administer your membership from a web page, go to: >> //www.freelists.org/webpage/si-list >> =3D20 >> For help: >> si-list-request@xxxxxxxxxxxxx with 'help' in the Subject field >> =3D20 >> =3D20 >> List technical documents are available at: >> http://www.si-list.net >> =3D20 >> List archives are viewable at: =3D20 >> //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 >> =3D20 >> =3D20 >> =3D20 >> =3D20 >> =20 > > > ------------------------------------------------------------------ > 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 technical documents are available at: > http://www.si-list.net > > List archives are viewable at: =20 > //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 > =20 > > > > =20 --=20 Steve Weir Teraspeed Consulting Group LLC=20 121 North River Drive=20 Narragansett, RI 02882=20 California office (408) 884-3985 Business (707) 780-1951 Fax Main office (401) 284-1827 Business=20 (401) 284-1840 Fax=20 Oregon office (503) 430-1065 Business (503) 430-1285 Fax http://www.teraspeed.com This e-mail contains proprietary and confidential intellectual property = of Teraspeed Consulting Group LLC -------------------------------------------------------------------------= --- -------------------------- Teraspeed(R) is the registered service mark of Teraspeed Consulting = Group LLC ------------------------------------------------------------------ To unsubscribe from si-list: 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//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