Patent ID: 7161444

Claim:
A directional coupler comprising: a substrate; and a conductor pattern formed on the substrate, the conductor pattern including: first to fourth lines, the first to fourth lines connected at and extending radially from a predetermined point on the substrate, each of the first to fourth lines having a respective first point on a center line thereof, the first point being a first distance from the predetermined point; a first conductive pattern portion defined by the first and second lines and a first connecting line that connects the first point of the first line and the first point of the second line, the first connecting line being one of a curve and a bent line having an inner angle equal to or more than 90° and less than 180°, wherein respective crossing angles defined at an intersection of the first connecting line and edges of the first and second lines is equal to or more than 90° and equal to or less than 180°; and a second conductive pattern portion defined by the third and fourth lines and a second connecting line that connects the first point of the third line and the first point of the fourth line, the second connecting line being one of a curve and a bent line having an inner angle equal to or more than 90° and less than 180°, wherein respective crossing angles defined at an intersection of the second connecting line and edges of the third and fourth lines is equal to or more than 90° and equal to or less than 180°, wherein each of the first to fourth lines has a respective second point on the center line thereof, the second point being a second distance from the predetermined point, wherein the second distance is different from the first distance; and the conductor pattern further includes: a third conductive pattern portion defined by the second and third lines and a third connecting line that connects the second point of the second line and the second point of the third line, the third connecting line being one of a curve and a bent line having an inner angle equal to or more than 90° and less than 180°, wherein respective crossing angles defined at an intersection of the third connecting line and edges of the second and third lines is equal to or more than 90° and equal to or less than 180°; and a fourth conductive pattern portion defined by the fourth and first lines and a fourth connecting line that connects the second point of the fourth line and the second point of the first line, the fourth connecting line being one of a curve and a bent line having an inner angle equal to or more than 90° and less than 180°, wherein respective crossing angles defined at an intersection of the fourth connecting line and edges of the fourth and first lines is equal to or more than 90° and equal to or less than 180°, wherein stubs are not connected any to of the conductive pattern portions.