Transmission Lines 1 of 2

[@glenmartin2437]

Thank you. This was very helpful in understanding some of the electronics glitches I have dealt with.

[@mdesm2005]

Does the conductance lead to a DC current flowing between the two wires? Through the dielectric?

[@matthewlopez2933]

Thanks for the explanations, very clear. I like how you relate to a little to basic circuits class which is nice to compare too.

[@jihokim912]

Very helpful. Thank you so much.

[@veronicanoordzee6440]

After 4:20: "Every wire is a transmissionline". Really? Or do you mean that every pair of wires is a transmissionline?

[@sridharchitta7321]

What is a transmission line? When a high frequency signal voltage is applied to a transmission line, which consists of a pair of perfectly conducting parallel planes separated by a distance, energy transfers from the source to the load by pulsating electric and magnetic fields between the planes; the fields don't travel. Transmission lines are analysed by considering the voltage and current on the line, and the field configurations and wave dynamics provide insights into the origins of the voltage and current. The book "Fundamentals of electric theory and Circuits" by Sridhar Chitta www.wileyindia.com/fundamentals-of-electric-theory-and-circuits.html begins with detailed discussions in the initial chapters on the topics of surface charge, coulomb's law, electric fields, fields of dipoles and other charge configurations such as a pair of parallel plates, in which a distinct approach is made using the surface charge concept in the study of advanced topics of capacitance, currents, conservation of charge, conservation of current, superposition of fields, superposition of potential, a simple dc circuit, voltage, voltage source, difference between e.m.f. and potential difference, ideal voltage sources, resistors, how current branches in a parallel circuit, capacitors, and the superposition of ac signals on a dc voltage for coupling signals to amplifiers. One section in Chapter 3 describes the principle of superposition of potential and provides an intuitive explanation of its application in small-signal ac circuit anaysis and developing ac equivalent circuits which is not usually found in textbooks. Then, two chapters are devoted to discussions on magnetic fields, magnetic fields of a current element, straight wire, current loop, solenoids, biot-savart law, inductors, Faraday's law, inductance, ac circuits, and transmission lines. The section on Transmission lines in Chapter 5, discusses signal transmission over two-wire lines and coaxial cables. There is an in-depth discussion on the origin of common-mode currents, incident and reflected waves in transmission lines and the TEM mode of wave of propagation. One section is devoted to a discussion of the attenuation in the context of lossless lines and the speed of propagation of signals over transmission lines. In several chapters, the differential-mode signals of circuits are identified and in one chapter a comparison of the differential-mode signal and common-mode signal is provided. An interactive Java based program depicting the passage of signals on transmission with a provision to vary line parameters is included in the CD alongwith the book, which is useful to understand the propagation of signals on transmission lines. Subsequent chapters discuss the Lorentz Force law, motors, generators, p-n junction diodes, electromagnetic waves, antennas and radiation, waveguides, and new electrodynamic theories on the nature of the electric field. The CD contains animated power point presentations for all chapters and voltage regulator, RC phase shift oscillator, transformer-coupled audio amplifier and differential amplifier included additionally. The contents of the above book by Sridhar Chitta, make a distinct unified approach to electrostatics and a few advanced circuits like coupling signals to amplifiers. This approach lends precision and clarity to the topics which is not found in most text books. There is a "look inside" feature in the amazon.com webpage of the book "Fundamentals of electric theory and circuits" by Sridhar Chitta with a few pages of Chapter 1 which may be viewed and also which you may swipe left or press < icon to view the foreword, preface and Table of Contents. There is a full set of lectures beginning lecture 13 here on surface charges, electric fields, simple circuits, capacitance, inductance, faraday's law, motional emf, magnetic forces and more topics here matterandinteractions.org/videos/EM.html Electrostatics and circuits belong to one science and not two, that of electricity and magnetism. To know how they are unified visit this link matterandinteractions.org/articles-talks/ and view the article 'A unified treatment of electrostatics and circuits. B. Sherwood and R. Chabay, unpublished. (1999)' pdf. For a live demonstration of surface charge and its effects in circuits visit kzbin.info/www/bejne/i2i1fZpja55km7M

[@jacobvandijk6525]

@@sridharchitta7321 Haha, thanks!

[@sridharchitta7321]

Consider connecting a single wire to one terminal of a battery. The potential of the terminal and the wire become equal in a fraction of a second when connected. This happens by a movement of charge. So, you may say, every wire is a transmission line. In the transmission of high power high frequency signals between a source and a transmitter, waveguides are sometimes used and these are single conductor in construction and not a pair.

[@jacobvandijk6525]

@@sridharchitta7321 Right. That's the answer I was looking for. Explained in simple words. That's the power of education!

[@sridharchitta7321]

@@jacobvandijk6525 Thank you. I am happy it helped.

[@jacobvandijk6525]

After 2:40: I think that should be 1/R (or G), not 1/G. This is about the leak-current between the two wires.