Patent ID: 7936232

Claim:
A substrate for a semiconductor package, comprising: a dielectric substrate; a circuit pattern formed on a first surface of the dielectric substrate; and an electromagnetic band gap (EGB) pattern comprising: a plurality of unit structures formed on a second surface of the dielectric substrate opposite the first surface, each unit structure comprising: a flat conductor electrically connected to the circuit pattern through a ground connection; and a plurality of conductors having a zigzag pattern electrically connected to the flat conductor, wherein each of the plurality of conductors comprises: a first pattern extending in an inward spiral direction from a first outer end to a first inner end; a second pattern extending in an outward spiral direction, opposite the inward spiral direction, from a second inner end to a second outer end; and a connecting portion connecting the first inner end and the second inner end, wherein each flat conductor is electrically connected to a flat conductor of another one of the plurality of unit structures, and wherein at least one of the plurality of conductors in each one of the plurality of unit structures is electrically connected to another one of the plurality of conductors.