Does a magnet affect antenna transmission?

[PolyOneTechie]

I am working with an application where we have a magnet in close proximity to an antenna in the 20 - 25 GHz range. If there IS and affect of the magnet to the antenna's transmission, does the "near field" calculation apply (λ/2xpi)? If the antenna is out of the near field, is there no affect to the antenna's transmission in the frequency range?

 

[Simon Bridge]

Welcome to PF;
For transmission - a static magnetic field may have a small damping effect on the motion of charges moving in and out of it. The transmitted field will just superpose with the magnets field so it should not affect a signal.

I take it you are experiencing some problems with your setup?

 

[PolyOneTechie]

No, this is a general question as we are trying to look at an application and anticipate any effects that may occur. Coming from the materials science side, I have these questions about the electromagnetic realm. Thank you for your response!

 

[physwizard]

its unlikely to affect. note in the expression for magnetic force $\bar{F} = q \bar{v} \times \bar{B}$ , force is perpendicular to the direction of motion of the charge carriers. so while you may see some kind of Hall effect (a transverse potential difference) its unlikely to affect the flow of current in the circuit.

 

[sardar]

I would say that the presence of a magnet in close proximity to an antenna in the 20-25 GHz range could potentially affect the antenna's transmission. This is because magnets can create a magnetic field, which can interact with the electric field of the antenna and potentially alter its performance.

In terms of the "near field" calculation, it is important to note that this calculation is primarily used to determine the strength of the electric and magnetic fields near an antenna, and is not directly related to the potential impact of a magnet on the antenna's transmission. However, in general, the closer a magnet is to an antenna, the stronger its influence is likely to be.

If the antenna is outside of the near field, it is possible that the magnet may have less of an impact on its transmission in the frequency range. However, this would depend on the strength of the magnetic field and the specific design and characteristics of the antenna.

Overall, it is important to carefully consider the potential effects of a magnet on an antenna's transmission in the 20-25 GHz range, and to conduct thorough testing and analysis to determine the extent of any impact.