Hi Tesla, a wave can propagate along an ideal (no losses) transmission line undisturbed. now whether it encounter a resistor, transmission line step, change of medium,.......they are all seen from the wave front as discontinuity. Depending on the entity of this discontinuity as result the propagating wave will be partly transmitted and partly reflected back......this reflection will be summed up (constructive or destructive) with the existing wave (assuming steady state propagation - ). Generally speaking you will have a reflection at each "discontinuity". If a "real" 50 ohm resistor is attached to a "real" 50ohm transmission line.....you will still have some reflections back.....although very very small.......due to the way the resistor is connected to the transmission line. I would suggest to have a look at the website microwave101.com to get some more wordy description of the phenomenon before you dash into "Telegraph's equations" for voltages and currents. The question you rose is part of the basis of guided/free space propagation topic. regards > From: Gert.Havermann@xxxxxxxxxxx > To: emcesd@xxxxxxx; si-list@xxxxxxxxxxxxx > Subject: [SI-LIST] AW: How to explain reflection in circuit? > Date: Thu, 16 Aug 2012 12:46:57 +0000 > > Hi Tesla, > > you should view the terminating resistor as an infinitively long transmission > line, and if you connect two transmission lines of different impedances, then > the impedance step (discontinuity) will reflect energy (only a perfect match > can consume all the energy). > > BR > Gert > > > ---------------------------------------- > Absender ist HARTING Electronics GmbH & Co. KG; Sitz der Gesellschaft: > Espelkamp; Registergericht: Bad Oeynhausen; Register-Nr.: HRA 5596; > persönlich haftende Gesellschafterin: HARTING Electronics Management GmbH; > Sitz der Komplementär-GmbH: Espelkamp; Registergericht der Komplementär-GmbH: > Bad Oeynhausen; Register-Nr. der Komplementär-GmbH: HRB 8808; > Geschäftsführer: Edgar-Peter Duening, Torsten Ratzmann, Dr. Alexander Rost > > -----Ursprüngliche Nachricht----- > Von: si-list-bounce@xxxxxxxxxxxxx [mailto:si-list-bounce@xxxxxxxxxxxxx] Im > Auftrag von Tesla > Gesendet: Donnerstag, 16. August 2012 14:13 > An: si-list > Betreff: [SI-LIST] How to explain reflection in circuit? > > Hi, expert > > In RF Circuit or signal integrity text book, it tell us if the load impedance > do not equal transmission line charateritic impedance,the reflection will > occur. > But how did we explain this reflection in the aspect of wave? > Did the resistor show himself a boundary condition? > Could some recommand some documents or text book on this subject? > > Thanks > > Tesla. > ------------------------------------------------------------------ > 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 forum is accessible at: > http://tech.groups.yahoo.com/group/si-list > > List archives are viewable at: > //www.freelists.org/archives/si-list > > Old (prior to June 6, 2001) list archives are viewable at: > http://www.qsl.net/wb6tpu > > > > ------------------------------------------------------------------ > 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 forum is accessible at: > http://tech.groups.yahoo.com/group/si-list > > List archives are viewable at: > //www.freelists.org/archives/si-list > > Old (prior to June 6, 2001) list archives are viewable at: > http://www.qsl.net/wb6tpu > > ------------------------------------------------------------------ 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 forum is accessible at: http://tech.groups.yahoo.com/group/si-list List archives are viewable at: //www.freelists.org/archives/si-list Old (prior to June 6, 2001) list archives are viewable at: http://www.qsl.net/wb6tpu