Power amplification apparatus in communication system

A power amplification apparatus in a communication system, the apparatus comprising:

• a ground plane for removing a noise frequency component;
• and
• a high power amplifier connected to the ground plane,
• wherein the ground plane has a parallel structure of alternately arranged first and second lattice structures, the first lattice structure comprising a plurality of first etched portions serially repeated on a copperplate at an interval of a first period, and the second lattice structure comprising a plurality of second etched portions serially repeated on the copperplate at an interval of a second period, and
• wherein the first period is
• λ
• 0
• 4
• ,
• representing an interval of the noise frequency component generated from the high power amplifier, with λ0 representing a wavelength of an electric field in free space defined by
• λ
• 0
• =
• λ
• er
• ,
• in which λ represents a wavelength of a frequency, and “er” represents a dielectric constant of a substrate.