Hi Meenakshi,

just a sheet of PTFE would not be sufficient because how would you fix the copper foil on it?

If you have all equipment necessary for drilling, through-hole-contacting, masking, exposing, etching etc. at hand, you might try Rogers:

https://www.rogerscorp.com/acs/producttypes/7/RO3000-Laminates.aspx

I'm not sure in which quantities they are selling.

While drilling etc. is relatively simple, through-hole-contacting is not (and with high frequency, I would advise against connecting layers by soldering short wires to the layers or using rivets). If you have to order your PCBs from a manufacturer you don't have to buy the material yourself. Manufacturers in the US which process materials from Rogers are, for example:

https://www.cirexx.com/rogers-materials/

https://www.pcb4less.com/services.asp

Hi Meenakshi,

You may make inquiry at Alfa Chemistry in New York, they offer kinds of chemical for research use.

https://www.alfa-chemistry.com/order.htm

Thank you. Is PTFE flexible? My application is for wearable

It depends on the application. If you are aiming at something like a wristband, I'm sure that a PTFE stripe of some 0.1 mm is flexible enough.

If your goal is something like a "smart shirt", and your circuit shall not stick out like a sheriff badge but be really textile I think that you have to solve the problem in reverse order: First look which woven (or similar) materials meant as carriers for conductive traces are commercially available (probably, there is no pure PTFE) then choose from these the material with the most suitable properties for your application and simulate your circuit based on this material.