# Tagged Questions

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131 views

### A “figure-8” EM field created by a dipole antenna

This question pertains to the EM field of a Pulse W5017 dipole antenna. The data sheet of this antenna can be found here (which contains information regarding the radiation patterns). There are TWO ...
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### Can antennas work with high frequency EM waves?

Antennas usually work with FM waves, and AM waves, which mostly used in telecommunications. Information is transferred on FM, and AM waves by a transmitter transmitting information on these EM waves. ...
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### How can I determine if A 34 meter antenna can be used as PTA?

What are the general requirements for any antenna, e.g., one with 34 m of dish, to be used as PTA (Pulsar Timing Array) monitoring? What are the main formulae to be used? How can the TOA (time of ...
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### Antenna measurements and parameters calculation

Lets suppose we have some data collected from antenna measurement. For every theta and phi point in any coordinate system ( here refering to Ludiwg coordinate systems II and III) the data can be ...
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### Transmission Lines and Antennas

In Transmission Lines, does the electric field exist between the two conducting wires or does it exist inside a wire, pushing the flow of electrons? And do all antennas radiate energy by spark?
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### Impact of antenna spacing larger than a half of wavelngth

I am building a uniform linear antenna array (ULA) of Wi-Fi to extract channel state information, or channel matrix $H$. With some literature search, as not familiar with antennas and electromagnetic ...
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### Antennas and the electromagnetic field

I'm an electrical engineering undergrad and have some questions about radio antennas. We've just covered the electronics and maths of radio theory once the signal has reached the receiver, I'm ...
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### A Formula for the Phase Difference Between the Electric and Magnetic Wave Oscillations?

A) Is there a formula for the phase difference between the electric and magnetic field oscillations, in vacuum, in an electromagnetic wave emitted from an antenna, as a function of the frequency the ...
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### Effective aperture of an isotropic antenna; question on polarisation

In this answer to Effective aperture of isotropic antenna, a factor of 1/2 was included to account for polarisation, but the antenna was isotropic. How can this discriminate polarisation?
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### Current distribution on a dipole antenna

It is known that the current distribution on a thin dipole antenna is always sinusoidal: http://www.antenna-theory.com/antennas/dipole.php How can I prove this?