The thinnest UHF RFID tag antenna

[streamlet]

As far as I know, the published smallest thickness is 1.52 mm, which is a PIFA-type antenna made on Taconic RF-35 substrate. Have anyone seen any UHF tag antenna thinner than this?

 

[kspalla]

This corresponds to roughly 60 mil substrate.
You can do the same on 5 mil also but delicate to handle if used antenna alone.

 

[FvM]

You can do the same on 5 mil

I would expect a very poor efficiency

 

[streamlet]

Poor efficiency and narrow bandwidth are also what I am worrying about.

You can do the same on 5 mil

I would expect a very poor efficiency

 

[Libor124]

Hi, yes I have on my hand the UHF on metal tag with thickness 1.00mm, the reading distance on metal was 2feets(50cm) 2W ERP

 

[volker_muehlhaus]

I would expect a very poor efficiency

Why? For PIFA, gain and efficiency should not be sensitive to the substrate thickness.

 

[FvM]

Yes, you are right for PIFA. I was thinking of a patch antenna.

 

[streamlet]

Hi, yes I have on my hand the UHF on metal tag with thickness 1.00mm, the reading distance on metal was 2feets(50cm) 2W ERP

may I know the horizontal size of the metal tag?

 

[Libor124]

The size is 150x8x1mm

 

[Libor124]

Hi ,

I have for your small update, the smaller UHF tag on metal has the size 15x15x1,5mm, what is exciting , the tag is possible read with output power of a reader 100mW

 

[WimRFP]

Hello FvM and Volker

Yes, you are right for PIFA. I was thinking of a patch antenna.

From my experience PIFA over ground is half a patch (shorted quarter wave resonator instead of half wave), so same rules apply as for patch antennas. Maybe you have some other structure in mind?