Does a magnet affect antenna transmission?

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Discussion Overview

The discussion revolves around the potential effects of a magnet on antenna transmission, specifically in the 20 - 25 GHz frequency range. Participants explore whether the proximity of a magnet influences the antenna's performance and the relevance of near field calculations in this context.

Discussion Character

  • Exploratory, Technical explanation, Conceptual clarification

Main Points Raised

  • One participant questions if the near field calculation (λ/2π) applies when considering the effects of a magnet on antenna transmission.
  • Another participant suggests that a static magnetic field may have a small damping effect on charge motion, but believes it will not significantly affect the transmitted signal.
  • A participant clarifies that their inquiry is general, aimed at anticipating potential effects in their application, indicating a background in materials science.
  • Another response indicates that while a Hall effect might occur due to the magnetic field, it is unlikely to impact the current flow in the circuit significantly.

Areas of Agreement / Disagreement

Participants express varying degrees of skepticism about the magnet's effect on antenna transmission, with no consensus reached on the extent of any potential influence.

Contextual Notes

Participants acknowledge the complexity of electromagnetic interactions and the need for further exploration of the conditions under which a magnet might affect antenna performance.

Who May Find This Useful

Individuals interested in antenna design, electromagnetic theory, and applications involving high-frequency transmissions may find this discussion relevant.

PolyOneTechie
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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?
 
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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?
 
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!
 
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.
 

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