Hello Guys, hope you all doing well.

I'm working on a project in communication, I need to transmit radio waves and recieve a particular wave. This particular reflected wave should have a change in it's characteristic so that I can discriminate it !! wheather it has x*wave lenghth of transmitted or it has a fixed higher or smaller frequency or anything .
And what I need in particular is a substance (soild ). Like for example if this substance is in a shape of tape wrapped on a cup. when I send a signal this cup- among hundreds- will reflect a signal with a specific characteristic due to the tape, so that I can find it.

I hope the Idea is clear.

waiting for your answers guys.

 

You need to be researching microwave region material properties.

Lower freq "radio" band radiation has a much lower interaction with small everyday common items.

 

Even if you do receive a distinctive signal, how will you know which direction it came from? Or isn't that important?

 

Your title says electromagnetic waves; your question is far more restrictive. What you ask about doing is very easy to do with light and fluorescence. I am not aware that one get analogous fluorescence from radio waves and certainly not at room temperature.

Can you use light?

John

 

Your title says electromagnetic waves; your question is far more restrictive. What you ask about doing is very easy to do with light and fluorescence. I am not aware that one get analogous fluorescence from radio waves and certainly not at room temperature.

Can you use light?

John

No it's restricted to electromagnetic waves

 

Even if you do receive a distinctive signal, how will you know which direction it came from? Or isn't that important?

It's direction is very important, But with using radar technology we can overcome that right!!

 

No it's restricted to electromagnetic waves

So then do it with a fluorescence tag and use image analysis.

John

 

John[/QUOTE]
Do you recommend any link ?

 

Do you want the fluorescence to be visible to others or in a portion of the spectra that human eyes can't see? Does it matter?
John

 

Do you want the fluorescence to be visible to others or in a portion of the spectra that human eyes can't see? Does it matter?
John

Actually I don't want it to be visible to human eye. I just got to sence it's exsistnce!!

 

Then you should look up "near-infrared fluorescent dyes." Here is one of many links: http://www.lumiprobe.com/c/nir-infrared-dyes

While you could also use UV dyes, because of the Stokes shift, you will have a more difficult time keeping the emission fully in the UV, and your source and detector would likely be more complicated than ones designed for IR. In fact with near-IR, you could probably just use the view finder on a typical digital camera to see which cup is marked.

John