Antenna apparatus including phase shifter

A phase shifter comprising:

• a first substrate comprising a phase change line;
• and
• a second substrate comprising an input line connected to an input port, a first output line connected to a first output port, a second output line connected to a second output port, and a connection line connecting the first output line to the second output line,
• wherein the first substrate faces the second substrate and is overlaid from the second substrate at a predetermined distance, and
• wherein a length of a first portion of the connection line changes by a movement distance of the first substrate, and a phase of a signal passing through the first portion of the connection line changes by a first value according to the length of the first portion of the connection line.

An antenna apparatus comprising:

• a housing;
• a first radiating element and a second radiating element disposed inside the housing;
• and
• a phase shifter disposed inside the housing and comprising,
• a first substrate comprising a phase change line;
• and
• a second substrate comprising an input line connected to an input port, a first output line connected to a first output port, and a second output line connected to a second output port,
• wherein the first substrate faces the second substrate and is overlaid from the second substrate at a predetermined distance, and
• wherein a length of a first portion of the phase change line changes by a movement distance of the first substrate, and a phase of a signal passing through the first portion of the phase change line changes by a first value according to the length of the first portion of the phase change line.