Determining the Correct Radio Frequency

AI Thread Summary
The discussion focuses on determining the appropriate radio frequency for an RF transceiver project facing wooden walls as obstacles. The user seeks equations to calculate frequencies for scenarios where radio waves either reflect off the first wall or pass through multiple walls before reflecting back. It is noted that dry wood is not an effective reflector of RF energy, which may complicate the project's feasibility. The user confirms that the material is fixed and cannot be changed, indicating a need for alternative solutions. The conversation highlights the challenges of RF transmission and reflection in environments with wooden barriers.
inno87
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I am building a project where an object will be fitted with an RF transceiver and where it will face wooden walls as obstacles, with constant thickness "t". I am trying to look for an equation that would give the appropriate radio frequency that I would need to generate to have a radio wave either:

A. Reflect at the 1st wooden wall directly in front of the object and then be received directly by the object.

B. Pass through x number of wooden walls in front of the object that is transmitting the wave and reflect at the x+1 wall, where the reflected wave would pass back through the same x number of wooden walls and be received at the object.

For example:

-Have the wave reflect at the first wall and reflect back directly to the object's receiver.

-Have the wave pass through the 1st wall, reflect at the 2nd wall, and then pass through the 1st wall to be received back at the object's receiver.

-Have the wave pass through the 1st and 2nd wall, reflect at the 3rd wall, and then pass through the 1st and 2nd wall to be received back at the object's receiver.

And so on..

In each of these cases, I would probably need to generate a specific radio frequency. The question is what would be the equation/theory in order to determine each of these frequencies? I also would assume that wood has an attenuation constant that I would have to account for.
 
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inno87 said:
I am building a project where an object will be fitted with an RF transceiver and where it will face wooden walls as obstacles, with constant thickness "t". I am trying to look for an equation that would give the appropriate radio frequency that I would need to generate to have a radio wave either:

A. Reflect at the 1st wooden wall directly in front of the object and then be received directly by the object.

B. Pass through x number of wooden walls in front of the object that is transmitting the wave and reflect at the x+1 wall, where the reflected wave would pass back through the same x number of wooden walls and be received at the object.

For example:

-Have the wave reflect at the first wall and reflect back directly to the object's receiver.

-Have the wave pass through the 1st wall, reflect at the 2nd wall, and then pass through the 1st wall to be received back at the object's receiver.

-Have the wave pass through the 1st and 2nd wall, reflect at the 3rd wall, and then pass through the 1st and 2nd wall to be received back at the object's receiver.

And so on..

In each of these cases, I would probably need to generate a specific radio frequency. The question is what would be the equation/theory in order to determine each of these frequencies? I also would assume that wood has an attenuation constant that I would have to account for.
Welcome to the PF. :smile:

Dry wood is not a good reflector of RF energy. You probably need to do something different for this. Is this for a maze-navigating robot or something?
 
Hi Berkemen,

Yes that is correct, it is for maze-navigating robot. The material is already fixed and cannot be changed.
 
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