Signal line conversion structure of antenna array

A signal line conversion structure of an antenna array, disposed between an antenna array and a circuit substrate, and comprising

• a first dielectric substrate disposed on said circuit substrate, wherein a back side of said first dielectric substrate has a first ground layer;
• a second dielectric substrate vertically installed in a front surface of said first dielectric substrate and dividing said first dielectric substrate into a first region and a second region, wherein one surface of said second dielectric substrate, which faces said second region, has a second ground layer, and wherein said antenna array is disposed on one end of said second dielectric substrate, which is not connected with said first dielectric substrate;
• at least one signal line disposed on said first region of said first dielectric substrate and extended to one surface of said second dielectric substrate, which faces said first region, to connect said circuit substrate with said antenna array;
• and
• a metal connecting plate having at least three metal through holes, disposed on said second region of said first dielectric substrate, and connected with said second ground layer, wherein a number of said at least three metal through holes is an odd number, and wherein said at least three metal through holes penetrate said first dielectric substrate, and wherein said metal connecting plate connects said first ground layer of said first dielectric substrate with said second ground layer of said second dielectric substrate through said at least three metal through holes.