Talk:Reflection coefficient

message: I reverted this edit buy user:Sandalsandsocks which has the edit summary "Added comment by first figure which appears to be incorrect. The figure shows the transmitted wave being an amplitude-scaled version of the incident wave, which is correct, but the reflected wave clearly has been distorted."  Problems in the article should be discussed on this talk page, not in the article itself. SpinningSpark 16:22, 21 April 2014 (UTC)
replies: text: First explain what you think is wrong with it. You say that it is distorted, but if I invert and rescale the amplitude of the reflected wave it fits perfectly over the incident wave, see the scrap view.  SpinningSpark 19:38, 21 April 2014 (UTC)
thread_title:  Editorializing in article 

message: I feel the recent changes to the first paragraph, which introduced the word electrodynamic for a wave on a transmission line, will be misleading for general readers.  Electrodynamic redirects to Classical electromagnetism, which is uninformative about transmission line propagation.   I understand the motivation, which was to differentiate a  space electromagnetic wave discussed in the previous sentence from a wave on a transmission line.    I'd be open to other wording.   But the current state of the sentence, which pipes the phrase electromagnetic wave to the term electrodynamic, is an WP:EASTER EGG which needs to be corrected.  --ChetvornoTALK 02:31, 3 June 2015 (UTC)
replies: text: I agree that it is an Easter egg, but that is not the fundamental problem.  The real problem is that the redirect should be to an article that discusses electromagnetic propagation on copper wires, but the target article does not do that however you try to pipe it.  There should be an article at TEM mode covering this, but that is an equally hopeless redirect as well.  No link at all is a better option than a useless one in my opinion.  If you want to insert a link specifically about reflections on copper lines though, as opposed to just waves, there is Reflections of signals on conducting lines which I created some time ago. SpinningSpark 15:06, 3 June 2015 (UTC)
replies: text: Looks good; I'll change the link. It's still an Easter egg, but at least it's a relevant Easter egg. --ChetvornoTALK 03:27, 5 June 2015 (UTC)
thread_title:  Recent change to introduction 

message: As there are different, incompatible meanings of reflection coefficient, disambiguation is necessary.
Confusion (unproven assumption that both be equal in a broader sense and thus would use the same equation) is omnipresent in literature and standard glossary.
I suggest the following hatnote disambiguation. Please discuss / comment / improve / agree:
:* In electrical engineering reflection coefficient is a measure of how much of a wave is reflected by a  load to  characteristic (medium or line) impedance mismatch, based on equal impedances for no reflection.
:* In electrical engineering "reflection coefficient" may also refer to the square root of how much of the maximum available real power of a source is unclaimed by a  load to source impedance mismatch, based on conjugate complex impedances for maximum real power transfer.
See: Shepard Roberts, Member I.R.E, Conjugate-image impedances,
:::https://worldradiohistory.com/hd2/IDX-Site-Technical/Engineering-General/Archive-IRE-IDX/IDX/10s/IRE-1946-04-OCR-Page-0081.pdf 
:::Proceedings of the I.R.E. and Waves and Electrons, volume 34, number 4, Section 1, April 1946
:::p.199 P, eq. (3a) “reflection coefficient”  \alpha_{10} = \frac {Z_1 - {Z_0}^*} {Z_1 + Z_0} , Fig. 1-Equivalent circuit of generator and load  Thomas R. Cuthbert Jr., Ph.D., Broadband Direct Coupled and Matching Networks,
:::https://archive.org/details/ost-engineering-rf_networks_ocr
:::ch. 2.1.1 Complex Source to Complex Load, p.9 eq. (2.1.3), generalized reflection coefficient \alpha \equiv \frac {Z_i - {Z_S}^*} {Z_i + Z_S}   Sophocles J. Orfanidis, Electromagnetic Waves and Antennas, ECE Department, Rutgers University. 2016, ch.16.4 “Antenna Equivalent Circuits”, https://www.ece.rutgers.edu/~orfanidi/ewa/ch16.pdf
:::p. 750, eq. (7.4.4),   \Gamma_{gen} =      \frac {Z_A - {Z_G}^*} {Z_A + Z_G}  
:::p. 751, eq. (7.4.7)   \Gamma_{load} =      \frac {Z_L - {Z_A}^*} {Z_L + Z_A}   DJ7BA (talk) 08:48, 31 August 2022 (UTC)
thread_title:  Disambiguation