My first post in this section here. Is there a type of antenna that can operate "ON" a metal ground plane?
Looking for 2.4GHz~2.5GHz antenna for WiFi+BT.
Can be adhesive flex PCB antenna or ceramic chip antenna.
I know ceramic patch antenna will work, but the smallest I can find is 12mm*12mm, which is too big for me.
I also came across the 3M "on-ground" antenna, but from its app note, it seems a ground clearance is recommended, so it's not truly "on-ground". Correct me if I'm wrong.
Target size: less than 9mm wide, 20mm long and 5mm thick.
Any suggestions?