Radiation apparatus

A radiation apparatus, comprising:

• at least four radiators;
• two L-shaped feeding sheets;
• and
• a balun structure,
• wherein the balun structure includes four L-shaped structures formed by eight conductive plates;
• wherein each L-shaped structure is electrically connected to one radiator at one end of the balun structure, and angles between a length direction of the radiator and two conductive plates are approximately 45 degrees;
• wherein each two adjacent L-shaped structures are arranged in a T shape, and the four radiators are in a cross shape and are approximately in a same horizontal plane;
• wherein two adjacent conductive plates of each two L-shaped structures are approximately parallel to each other and are spaced by a preset distance to form four feeding slots;
• and
• wherein the two L-shaped feeding sheets are disposed at approximately 90 degrees in the feeding slots in a staggered manner, and each L-shaped feeding sheet is disposed in two opposite feeding slots.