# Tagged Questions

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### Verification of Fourier transformationn of Io-sinh function [migrated]

I try to match. What could not match $I_o-\sinh$ pair developed by Ben Logan, transform pair also published in The Practical Application of the Fourier Integral Campbell, George A .Sir J.F. Kaiser ...
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### Question on envelope-carrier description of traveling wave

I'm doing a research internship in attosecond physics right now, and one of the really important things in the field is the description of a propagating laser pulse as the combination of a slowly (or ...
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As far as I know, the function: $$\vec{E}(\vec{r},t)=\vec{E_0}\cdot e^{i(\vec{k}\cdot \vec{r}-\omega t)} \hspace{2cm}(1)$$ is a mathematical solution of the wave equation: $$\nabla^2 ... 1answer 62 views ### Far Field Diffraction of EM waves: what does the zero frequency signify? If you have a system of independently radiating electrons/point-charges, the far field distribution of the EM waves can be approximated by the fraunhoffer diffraction integral, or simply by the ... 0answers 44 views ### Phased array radar equations Suppose we have several antennae to transmit and receive radio waves. What should one transmit, and what kind of equations are used to compute reflectivity(\vec{x}) for points in space from a given ... 1answer 322 views ### Fourier transformation, electric field and magnetic field to have a shielding lattice against particles With Fourier-Series Expansion, we can write a function as sum of many non-repating different frequncied different amplituded sine and cosine functions. Lets assume we know electric-field and ... 0answers 133 views ### Fourier Transform of ribbon's beam Electric Field I have a monochromatic ribbon beam with E(x)e^{i(kz-\omega t)} being the electric field's amplitude. I want to show that the lowest order approximation in terms of plane waves is ... 5answers 3k views ### Why are AC quantities represented by sine waves always? Usually we use a sinusoidal wave form to represent a alternating quantity. Why not a cosinusoidal wave or a ramp wave form? In sine wave forms we can indicate the maximum and minimum amplitude and ... 3answers 283 views ### Energy stored in space/frequency electric field I've come across a problem with finding the energy stored in time/frequency electric field. In space/time we have (taking \epsilon = 1)$$ Energy = \frac{1}{2} \int_V |\mathbf{E}(\mathbf{x},t)|^2 ...
I have here below the distribution of the magnetic flux density $B$ across a 1 pole pitch in the airgap of a synchronous machine. The horizontal axis represents the distance along the arc length ...