Transmission line structure having a signal line spaced apart from ground by an air layer and the signal line is supported at a center part thereof

A Radio Frequency (RF) circuit of a wireless communication system, the RF circuit comprising:

• a plurality of RF components;
• and
• a transmission line structure,
• wherein the transmission line structure includes a ground area, a signal line, and a support formed of a dielectric material,
• wherein the plurality of RF components are disposed on the transmission line structure and connected by the signal line,
• wherein a first surface of the signal line is disposed to be spaced apart from the ground area through an air layer, and a second surface of the signal line located opposite to the first surface is coupled to the support,
• wherein the support is coupled to the ground area, and
• wherein the support is coupled to a center part relative to a width of the second surface of the signal line.