Electronic device comprising antenna module

An electronic device comprising an antenna module, the electronic device comprising:

• a communication module configured to communicate with an external electronic device;
• a first antenna module comprising multiple first antenna cells and first dummy cells configured to surround the multiple first antenna cells and re-radiate at a same frequency as the multiple first antenna cells;
• a second antenna module disposed spaced a preconfigured distance apart from the first antenna module and comprising multiple second antenna cells and second dummy cells configured to surround the multiple second antenna cells;
• and
• a controller configured to control the communication module, the first antenna module, and the second antenna module,
• wherein each of the multiple first antenna cells is configured to have a first size, and each of the first dummy cells is configured to have a second size smaller than the first size, and
• each of the multiple second antenna cells is configured to have a third size, and each of the second dummy cells is configured to have a fourth size smaller than the third size.