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Physics

Questions tagged [antennas]

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The interfaces between radio waves propagating through space and electric currents moving in metal conductors, used with a transmitter or receiver. Antennas are essential components of all radio equipment.

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2votes
0answers
64views

I am struggling to resolve a thought experiment that deals with the behavior of an EM wave as it reaches the end of a tube.Assume a wave starts out traveling along the outside of a copper tube. The ...
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In harmonic analysis, we have the (one-dimensional) uncertainty principle:$$\left(\displaystyle\int\limits_{-\infty }^{\infty }x^{2}|f(x)|^{2} \, \mathrm dx\right)\left(\displaystyle\int\limits _{-\...
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In my textbook (page 275):https://blogmedia.testbook.com/blog/wp-content/uploads/2022/04/physics-part-i-chapter-8-b20d7a00.pdfand on Wikipedia:https://en.wikipedia.org/wiki/File:...
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I'm thinking of putting a wifi satellite on a screened in porch outside, to cover my yard. The Internet seems to think that wire screens don't block wifi, but wifi has a wavelength of 2 inches or more,...
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I am doing a report on radar gun physics; it's for my high school physics report, so I don't really understand the core electrical physics well. I have read that the microwaves are produced by a Gunn ...
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Empirically, we know that a mesh screen to block EM waves, must have mesh size much smaller than the wavelength. e.g. microwave ovenWhat I find perplexing, intuitively, is the geometry underlying ...
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I was reading about how accelerated cahrges radiate electromagnetic waves, and i found the most known application on it was the dipole antenna, which was by applying an alternating voltage signal the ...
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Diffraction Pattern in Near-Field vs Far-Field:Consider a monochromatic EM wave with a wavelength of 3 km, produced by an antenna. Now, imagine placing a slit of 5 meters aperture at two different ...
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Lets say we have an emitter antenna which produces an EM signal with a massive wavelength (300km), we have a receiver antenna 200km away form the emitter. We turn on the antenna, and when the ...
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149views

When a change in voltage changes the static and inductive fields around an antenna, the change is propagated through space at the speed of light. Before the change arrives at a point in space, the ...
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1answer
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Since light is an electromagnetic wave,is it possible to build an antenna to receive many different frequencies?From KHz to THz?Or the wavelength makes it impossible?
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In a lecture about satellite sounding our professor explained how microwave radiance is measured typically on satellites: There is an antenna behind a parabolic mirror and the received signal is ...
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938views

Radio signals come to antennas from certain directions. How does the antenna process of receiving the signal in the air work? How does a certain antenna receive this electromagnetic field as the radio ...
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I have read in my book under communication systems topic that the minimum length of antenna required for communication is wavelength/4 without any explanation. What is the reason for this? Why is only ...
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I need to know how Voyager-I was able to communicate with the base station on earth using the 3.7m dish antenna? Usually any dish antenna needs to be pointed towards the receiver and Voyager must be ...

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