Coupler having port lines

1 . A coupler comprising:

a coupler body having an external ground formed on an outer surface thereof;

a coupler line located inside the coupler body and electrically connected to a port electrode for signal connection with an outside source;

an internal ground disposed between the external ground and the coupler line and electrically connected to the external ground; and

a port line having one end electrically connected to the port electrode and the other end electrically connected to the coupler line,

wherein the external ground comprises:

a first external ground configuring a lower surface of the coupler body; and

a second external ground configuring an upper surface of the coupler body,

wherein the internal ground further includes:

a first internal ground disposed between the first external ground and the second external ground; and

a second internal ground disposed between the first external ground and the second external ground and disposed to be spaced apart at a first interval from the first internal ground,

wherein an interval between the first internal ground and the first external ground is narrower than an interval between the second internal ground and the second external ground.

2 . The coupler of claim 1 , wherein the coupler line is disposed between the external ground formed on a lower surface of the coupler body and the internal ground.

3 . The coupler of claim 1 , wherein the coupler line is disposed between the first internal ground and the second internal ground.

4 . The coupler of claim 1 , wherein the internal ground has a center part formed in a rectangular shape and both sides facing each other and formed to extend toward an outside.

5 . The coupler of claim 1 , wherein the internal ground is electrically connected to the external ground through an outer surface of the coupler body.

6 . The coupler of claim 1 , wherein the coupler line has one side formed in a spiral shape and the other side formed in a spiral shape, the one side and the other side being connected to each other.

7 . A coupler comprising:

a coupler body having an external ground formed on an outer surface thereof;

a coupler line located inside the coupler body and electrically connected to a port electrode for signal connection with an outside source;

an internal ground disposed between the external ground and the coupler line and electrically connected to the external ground; and

a port line having one end electrically connected to the port electrode and the other end electrically connected to the coupler line,

wherein the coupler line comprises:

a first coupler line electrically connected to the port line; and

a second coupler line disposed to be spaced apart from the first coupler line,

wherein a spiral shape formed on one side of the first coupler line and a spiral shape formed on one side of the second coupler line are disposed at a location where the spiral shapes overlap each other, and

wherein a spiral shape formed on the other side of the first coupler line and a spiral shape formed on the other side of the second coupler line are disposed at a location where the spiral shapes overlap each other.

8 . The coupler of claim 1 , wherein four corners of the coupler body are formed to be curved toward an inside, and wherein the port electrode is disposed at each of the corners.

9 . A coupler comprising:

a coupler body having an external ground formed on an outer surface thereof;

a coupler line located inside the coupler body and electrically connected to a port electrode for signal connection with an outside source;

an internal ground disposed between the external ground and the coupler line and electrically connected to the external ground; and

a port line having one end electrically connected to the port electrode and the other end electrically connected to the coupler line,

wherein the internal ground is formed to overlap a location where one side and the other side of the coupler line are connected to each other,

wherein the port line comprises:

a first port line electrically connected to the first coupler line; and

a second port line electrically connected to the second coupler line,

wherein the first port line is disposed on both sides of a diagonal that connects a first surface and a second surface of the coupler body to each other, and

wherein the second port line is disposed on both sides of a diagonal that connects a third surface and a fourth surface of the coupler body.

10 . The coupler of claim 1 , wherein the coupler body further comprises a via that electrically connects the other end of the port line and the coupler line to each other.

11 . The coupler of claim 1 , wherein the coupler body comprises a plurality of sheets stacked inside the coupler body, and

wherein the sheets include:

a coupler sheet provided with the coupler line; and

a port sheet provided with the port line.