An antenna assembly comprising: a first antenna comprising a first radiator, a first signal-source, a first matching circuit, and a first adjusting circuit, wherein the first signal-source is electrically connected to the first radiator through the first matching circuit, and the first adjusting circuit is electrically connected to the first matching circuit or the first radiator, and configured to adjust a resonant frequency-point of the first antenna to make the first antenna support transmission/reception of an electromagnetic wave signal in a first frequency band; and a second antenna comprising a second radiator, a second signal-source, a second matching circuit, and a second adjusting circuit, wherein the second signal-source is electrically connected to the second radiator through the second matching circuit, and the second adjusting circuit is electrically connected to the second matching circuit or the second radiator, and configured to adjust a resonant frequency-point of the second antenna to make the second antenna support transmission/reception of an electromagnetic wave signal in a second frequency band and a third frequency band, wherein, the antenna assembly has a first resonant mode, a second resonant mode, a third resonant mode, and a fourth resonant mode; the first resonant mode is a 1/8 wavelength mode of the second antenna, the second resonant mode is a 1/4 wavelength mode from the first adjusting circuit to a gap between the first radiator and the second radiator, the third resonant mode is a 1/4 wavelength mode of the second antenna, and the fourth resonant mode is a 1/4 wavelength mode from the second signal-source to the gap between the second radiator and the first radiator; and transmission/reception of the electromagnetic wave signal in the second frequency band and the third frequency band is supported by the first resonant mode, the second resonant mode, the third resonant mode, and the fourth resonant mode. a first antenna comprising a first radiator, a first signal-source, a first matching circuit, and a first adjusting circuit, wherein the first signal-source is electrically connected to the first radiator through the first matching circuit, and the first adjusting circuit is electrically connected to the first matching circuit or the first radiator, and configured to adjust a resonant frequency-point of the first antenna to make the first antenna support transmission/reception of an electromagnetic wave signal in a first frequency band; and a second antenna comprising a second radiator, a second signal-source, a second matching circuit, and a second adjusting circuit, wherein the second signal-source is electrically connected to the second radiator through the second matching circuit, and the second adjusting circuit is electrically connected to the second matching circuit or the second radiator, and configured to adjust a resonant frequency-point of the second antenna to make the second antenna support transmission/reception of an electromagnetic wave signal in a second frequency band and a third frequency band, wherein, the antenna assembly has a first resonant mode, a second resonant mode, a third resonant mode, and a fourth resonant mode; the first resonant mode is a 1/8 wavelength mode of the second antenna, the second resonant mode is a 1/4 wavelength mode from the first adjusting circuit to a gap between the first radiator and the second radiator, the third resonant mode is a 1/4 wavelength mode of the second antenna, and the fourth resonant mode is a 1/4 wavelength mode from the second signal-source to the gap between the second radiator and the first radiator; and transmission/reception of the electromagnetic wave signal in the second frequency band and the third frequency band is supported by the first resonant mode, the second resonant mode, the third resonant mode, and the fourth resonant mode.