Electronic device having antenna unit

An electronic device capable of wireless communication, the electronic device comprising:

• a housing of the device with a metal frame;
• a dielectric substrate arranged in the housing for supporting functional units for wireless communication;
• a dielectric cover arranged in contact with a top surface of the dielectric substrate;
• an antenna array including antenna elements arranged in the dielectric substrate, and configured to form traveling waves propagating in the dielectric substrate and the dielectric cover;
• and
• at least one spatial matching element arranged in space formed inside the dielectric substrate, spatially matched with the dielectric cover, and coupled with at least one of the antenna elements,
• wherein the spatial matching element is configured to be spatially matched with the antenna array with the dielectric cover and to reduce reflections of traveling waves propagating from the antenna array to the dielectric cover.