Electronic device comprising antenna

An electronic device, comprising:

• a housing including a first plate, a second plate facing the first plate and spaced from the first plate, and a side member surrounding a space between the first plate and the second plate,
• wherein the second plate includes a nonconductive material;
• at least one antenna element positioned within the space and positioned on a substrate parallel to the second plate,
• wherein the at least one antenna element faces the second plate and is spaced from the second plate by a gap h;
• a wireless communication circuit electrically connected to the antenna element and configured to transmit and/or receive a signal with a frequency between 20 GHz and 100 GHz and a first wavelength;
• and
• a dielectric material positioned in the gap h between the antenna element and the second plate and allowing the signal to change to a second wavelength less than the first wavelength,
• wherein the second wavelength is defined as
• λ
• 2
• =
• c
• f
• 
• ɛμ
• ,
• wherein f is a frequency of the signal, c is a speed of light constant 3×10̂8 meters/second, ε is a permittivity of the dielectric material, μ is a permeability of the dielectric material, and
• wherein the gap h corresponds to
• n
• 
• 
• λ
• 2
• 2
• ,
• wherein n is an integer.

An electronic device, comprising:

• a housing including a first plate, a second plate facing the first plate and spaced from the first plate, and a side member surrounding a space between the first plate and the second plate,
• wherein the second plate includes a nonconductive material;
• at least one antenna element positioned within the space and positioned on a substrate parallel to the second plate,
• wherein the at least one antenna element faces the second plate and is spaced from the second plate by a gap;
• a dielectric material positioned in the gap between the antenna element and the second plate;
• and
• a wireless communication circuit electrically connected to the antenna element and configured to transmit and/or receive a signal with a frequency between 20 GHz and 100 GHz.