- published: 24 Jul 2014
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Wave propagation is any of the ways in which waves travel.
With respect to the direction of the oscillation relative to the propagation direction, we can distinguish between longitudinal wave and transverse waves.
For electromagnetic waves, propagation may occur in a vacuum as well as in a material medium. Other wave types cannot propagate through a vacuum and need a transmission medium to exist.
Wave velocity is a general concept, of various kinds of wave velocities, for a wave's phase and speed concerning energy (and information) propagation. The phase velocity is given as:
where:
The phase speed gives you the speed at which a point of constant phase of the wave will travel for a discrete frequency. The angular frequency ω cannot be chosen independently from the wavenumber k, but both are related through the dispersion relationship:
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PROPAGATION OF ELECTROMAGNETIC WAVES:In communication using radio waves, an antenna at the transmitter radiates the Electromagnetic waves EM waves, which travel through the space and reach the receiving antenna at the other end. As the EM wave travels away from the transmitter, the strength of the wave keeps on decreasing. Several factors influence the propagation of EM waves and the path they follow. At this point, it is also important to understand the composition of the earth’s atmosphere as it plays a vital role in the propagation of EM waves. A brief discussion on some useful layers of the atmosphere is given in Table. Ground wave: To radiate signals with high efficiency, the antennas should have a size comparable to the wavelength of the signal at least /4. At longer wavelengths i...
Physics, Class XII Chapter : Communication Topic : Wave propagation methods Classroom lecture by Pradeep Kshetrapal. Language : English mixed with Hindi.
Extra credit project for class. Didn't put much effort so critiquing isn't necessary.
Mr.TVS Divakar (Asst. Proffessor of ECE Department) of Centurion University presented on Parameters of Ionospheric propagation
Electro magnetic waves: ELECTROMAGNETIC WAVES:- It was observed that a time varying magnetic field acts as a source of electric field and a changing electric filed give raise to magnetic field they any one of above fields changing with time a field of other kind id introduced. Consider a charge oscillating with same frequency this produces an oscillating electric filed in space .which produces an oscillating magnetic filed .this oscillating electric and magnetic field regenerate each other the wave propagates through the space .the frequency of electromagnetic wave is equal to frequency of oscillation of the charge.The detailed study shows that plane progressing electromagnetic wave so produced the following characteristics. The electric vector E ⃗ the magnetic vector B ⃗ are mutual...
Learn complete Physics for IIT JEE for free. Browse through topics and tons of solved examples to practice solving easy and tough problems.
Sky waves:In the frequency range from a few MHz up to 30 to 40 MHz, long distance communication can be achieved by ionospheric reflection of radio waves back towards the earth. This mode of propagation is called sky wave propagation and is used by short wave broadcast services. The ionosphere is so called because of the presence of a large number of ions or charged particles. It extends from a height of ~65 Km to about 400 Km above the earth’s surface. Ionisation occurs due to the absorption of the ultraviolet and other high-energy radiation coming from the sun by air molecules. The ionosphere is further subdivided into several layers, the details of which are given in Table. The degree of ionisation varies with the height. The density of atmosphere decreases with height. At great heights ...
This video gives you the basics of Radio Propagation: Basic information that includes Sun Spots, Solar flux, K and A factors Why should you be interested in propagation? Well if you want to make those DX contacts you will need to be aware of when propagation is best for conditions to your target. One way to do this is to listen. Another is to check propagation sources such as WWV mentioned above. You can also get familiar with the propagation tables presented monthly in QST and CQ magazines. These charts will tell you when to expect the best propagation on what bands and at what time for your location to other areas of the world. An excellent source is to check the DX clusters online or by packet radio. This can give you current information about DX activity that is happening right now.
Engineering Electromagnetics by Prof. Sheel Aditya sir
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"Electromagnetic Theory ”, an excellent course presented by Dr. Pradeep Kumar K, Electrical Engineering Department, IIT Kanpur as a part the NPTEL Online Courses (NOC). “Electromagnetic Theory“ is a core course for Electronics & Communications Engineering (ECE) and Electrical and Electronics Engineering (EEE) disciplines. Electronics is the science of controlling electrical energy electrically, in which the electrons have a fundamental role. Electronics deals with electrical circuits that involve active electrical components such as vacuum tubes, transistors, diodes, integrated circuits, associated passive electrical components, and interconnection technologies. Commonly, electronic devices contain circuitry consisting primarily or exclusively of active semiconductors supplemented with pa...
UK based mid-week net.
In this short video, you will be able to get an overview of the course Antennas and wave propagation. To further have a overview reading notes of this course, Kindly go to the following link and have a reading material. http://www.ccs.neu.edu/home/rraj/Courses/6710/S10/Lectures/AntennasPropagation.pdf To download a free downloadable text book on this subject please click the following link : https://www.jntubook.com/antennas-wave-propagation-textbook-free-download/ https://www.studynama.com/community/threads/229-Antenna-wave-propagation-(AWP)-pdf-ebook-lecture-notes-download For further reading of PPT from other experts, you are welcome to go to the following link given slideshare. http://www.slideshare.net/zarinamdamin/chapter-5-microwave-antenna?qid=80d612df-77f6-48ad-a0bb-38...
http://j.mp/2bTFk6A
http://j.mp/2bR5xTq
En este vídeo se explica una implementación sugerida para el algoritmo onda de propagación. (Lenguaje Java) Vídeo realizado por David Julián Guzmán Cárdenas, estudiante de Ingeniería de Sistemas y Computación de la Universidad Nacional de Colombia , en el marco del programa de tutorías académicas para los estudiantes de Estructuras de Datos. Enlace para descargar código : https://www.dropbox.com/s/52gjqyjtzqvnhqs/WavePro.java?dl=0 Copyright Disclaimer Under Section 107 of the Copyright Act 1976, allowance is made for "fair use" for purposes such as criticism, comment, news reporting, teaching, scholarship, and research. Fair use is a use permitted by copyright statute that might otherwise be infringing. Non-profit, educational or personal use tips the balance in favor of fair use"
ABAQUS tutorial : Part 2. Lamb Wave Propagation Analysis http://lbwzippo.wix.com/bwengineering
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Physics, Class XII Chapter: Communication Topic: Wave propagation. Classroom lecture by Pradeep Kshetrapal. Language : English mixed with Hindi.
Engineering Electromagnetics by Prof. Sheel Aditya sir
Engineering Electromagnetics by Prof. Sheel Aditya sir