RADIATION DEVICE AND MULTIBAND ARRAY ANTENNA

Embodiments of this application provide a radiation apparatus and a multi-band array antenna, and relate to the field of antenna technologies, so that more radiation apparatuses can be integrated when a size of a multi-band array antenna does not increase or increases slightly. The radiation apparatus includes a radiation module, a first conductor balun, and a second conductor balun. The first conductor balun is mechanically connected to the second conductor balun under the radiation module. The radiation module includes a first radiation unit and a second radiation unit in a +45° polarization direction, and a third radiation unit and a fourth radiation unit in a -45° polarization direction. The first conductor balun is configured to feed a first differential signal to the first radiation unit and the second radiation unit. The second conductor balun is configured to feed a second differential signal to the third radiation unit and the fourth radiation unit. The first conductor balun and the second conductor balun are disposed in the same plane. The radiation apparatus provided in the embodiments of this application is applied to a mobile communications system.