Provided are an aerial device applied to an electronic apparatus and corresponding method for setting the aerial device that include a first aerial unit located at the first position of the electronic apparatus, having a first communication bandwidth, and radiating a first aerial signal in a first polarization direction; and a second aerial unit located at the second position adjacent to the first position of the electronic apparatus, having a second communication bandwidth, and irradiating a second aerial signal in a second polarization direction orthogonal to the first polarization direction. In the present invention, the polarization directions of aerial signals of adjacent aerial units are orthogonalized to improve the isolation between adjacent aerial units, thus enabling different aerial units to be arranged adjacent to one another so as to reduce the footprint of an aerial device.