At the end of the day, PCB etching is all about removing copper from a board in as controlled a fashion as possible. PCB etching methods generally fall into one of two broad categories ...

The conductors in that antenna were made from copper foil tape, a material that’s perfect for all sorts of specialized applications, like the slot antenna that he builds in the video below.

This particular innovation, where a PCB is packed with stepped circular or rectangular copper coins, is headed to markets where even the best air coolers are impractical – like miniature devices ...