I just disassembled an external FM antenna designed for an old Asus laptop. I expected to find some circuitry and a monopole or some other simple antenna. However, what I found was the antenna shown in the picture (bottom and top view). Honestly, it resembles somewhat a monopole because there is a ground plane and only one side of the wire is connected to the coaxial cable that exited from the case of the antenna. But I can't explain why it has that strange shape. I should add that the bottom of the pcb was in contact (or maybe just really close) to two magnets.

• What kind of antenna is that and how does it work? (or where I can find how it works)
• What was the purpose of the two magnets?
• Why the ground plane is shaped too? (see the bottom view)

I just disassembled an external FM antenna designed for an old Asus laptop. I expected to find some circuitry and a monopole or some other simple antenna. However, what I found was the antenna shown in the picture (bottom and top view). Honestly, it resembles somewhat a monopole because there is a ground plane and only one side of the wire is connected to the coaxial cable that exited from the case of the antenna. But I can't explain why it has that strange shape. I should add that the bottom of the pcb was in contact (or maybe just really close) to two magnets.

• What kind of antenna is that and how does it work? (or where I can find how it works)
• What was the purpose of the two magnets?
• Why the is the wire shaped like that? And why is the ground plane shaped too? (see the bottom view)