Feeder line and antenna device using same

A feeder line comprising:

• a dielectric substrate formed in a plate shape;
• at least two first conductor patterns formed on a first surface of the dielectric substrate and extending from a first end surface side of the dielectric substrate toward a second end surface side opposite to the first end surface so as to divide the first surface of the dielectric substrate into a first area and a second area, an end on the first end surface side and an end on the second end surface side of each first conductor pattern serving as signal input/output ends;
• a first-area ground conductor pattern formed in the first area divided by the first conductor patterns on the first surface of the dielectric substrate, to be grounded;
• a second-area ground conductor pattern formed in the second area divided by the first conductor patterns on the first surface of the dielectric substrate, to be grounded;
• a second-surface ground conductor pattern formed on a second surface on a side opposite to the first surface of the dielectric substrate, to be grounded;
• a third-area ground conductor pattern formed in a third area between the two first conductor patterns on the first surface of the dielectric substrate, to be grounded;
• at least one second conductor pattern formed on the first surface of the dielectric substrate and connecting the third-area ground conductor pattern and the first conductor pattern;
• a plurality of conductors penetrating the dielectric substrate and connecting between the second-surface ground conductor pattern, and the first-area ground conductor pattern, the second-area ground conductor pattern, and the third-area ground conductor pattern;
• and
• a conductive member connecting the first-area ground conductor pattern and the second-area ground conductor pattern while straddling the first conductor patterns, wherein
• a length of the one second conductor pattern is an odd multiple of ¼ of a wavelength of a signal propagating through the first conductor pattern.