Electronic device having antenna module

An electronic device comprising:

• a metal frame coupled to a side region of the electronic device;
• a dielectric case arranged at one side of the metal frame, wherein the dielectric case is shaped to include an inner region;
• a first array antenna and a second array antenna, each arranged in respective substrates and located in the inner region of the dielectric case,
• wherein the dielectric case comprises a first side part coupled to the metal frame, a second side part corresponding to the first side part, and a third side part and a fourth side part each being arranged between the first side part and the second side part,
• the third side part comprises a first inner surface, a second inner surface, and a first outer surface, and the fourth side part comprises a first inner surface, a second inner surface, and a second outer surface,
• for the third side part, the first inner surface faces and is spaced apart, by a first gap, from a surface vertical to a longitudinal end of the first array antenna and the second inner surface faces and is spaced apart, by a second gap, from the surface vertical to the longitudinal end of the first array antenna,
• for the fourth side part, the first inner surface faces and is spaced apart, by the first gap, from the surface vertical to a longitudinal end of the second array antenna and the second inner surface faces and is spaced apart, by the second gap, from the surface vertical to the longitudinal end of the second array antenna,
• the second gap is wider than the first gap,
• for each of the third side part and the fourth side part, a first thickness between the first inner surface and a respective one of the first outer surface and the second outer surface is greater than a second thickness between the second inner surface and a respective one of the first outer surface and the second outer surface,
• the first array antenna is configured to radiate a wireless signal through the first inner surface and the second inner surface of the third side part and the first outer surface of the third side part, and
• the second array antenna is configured to radiate a wireless signal through the first inner surface and the second inner surface of the fourth side part and the second outer surface of the fourth side part.