The embodiments of the present application provide an antenna device and an electronic device, in which a main screen antenna and a secondary screen antenna are respectively designed in the main screen part and the secondary screen part of the electronic device, wherein the main screen antenna and the secondary screen antenna can be antennas of the same
frequency band, and when the folding screen is in the folded state, the positions of the main and secondary screen antennas will overlap. The main screen antenna and the secondary screen antenna can excite two antenna
modes with
high isolation. In this way, even if the main screen antenna and the secondary screen antenna are of the same frequency and overlap, good isolation can be obtained, and the
radiation patterns are complementary, which is particularly beneficial for the
MIMO antenna design of electronic devices with folding screens. Moreover, it is not necessary to isolate multiple antennas of the same
frequency band in physical positions. For example, two or more antennas of the same frequency with
high isolation can be obtained without staggering the design in physical positions, thereby making full use of the
antenna design space of electronic devices with folding screens.