Antenna filter and electronic device comprising same in wireless communication system

A Multiple input Multiple output Unit (MMU) device comprising:

• a plurality of power amplifiers;
• an antenna array comprising a plurality of sub-arrays,
• wherein the plurality of sub-arrays comprising a first sub-array, the first sub-array comprising:
• a splitter configured to divide a signal received from one of the plurality of power amplifiers into multiple transmission lines;
• a plurality of filters, each filter receiving a divided signal from the splitter via each transmission line;
• and
• a plurality of antenna elements, each antenna element being coupled to a corresponding filter and receiving a filtered signal from the corresponding filter,
• wherein at least a portion of a first reflected wave by a first incident wave for a first filter is canceled by a second reflected wave by a second incident wave for a second filter.