Abstract: An electronic device includes a printed circuit board (PCB), an antenna and a switch. The antenna is printed on the PCB. The antenna includes multiple key contacts. Each of the multiple key contacts includes a first terminal, a second terminal and a third terminal. The first terminal is an output terminal. The second terminal and the third terminal are connected in series in the antenna. The switch switches the electronic device to an input mode and an antenna mode, thus the electronic device can be alternatively switched to an input function or a communication function.

Abstract: An electronic device includes a printed circuit board (PCB), an antenna and a switch. The antenna is printed on the PCB. The antenna includes multiple key contacts. Each of the multiple key contacts includes a first terminal, a second terminal and a third terminal. The first terminal is an output terminal. The second terminal and the third terminal are connected in series in the antenna. The switch switches the electronic device to an input mode and an antenna mode, thus the electronic device can be alternatively switched to an input function or a communication function.

Abstract: A printed antenna, disposed on a substrate including a first surface and a second surface, includes a plurality of holes, a radiating body, and a feeding portion. The radiating body includes a first radiator arranged on the first surface and a second radiator arranged on the second surface. The first radiator includes a plurality of first radiating portions spaced apart from each other and positioned between two adjacent holes on the first surface. The second radiator includes a plurality of second radiating portions spaced apart from each other and positioned between two adjacent holes on the first surface. The plurality of first radiating portions and the plurality of second radiating portions are put end to end via the plurality of holes from the first surface to the second surface.