3D electromagnetic bandgap circuit

A 3D electromagnetic bandgap circuit (100), comprising:

• a dielectric layer (110), having a first surface (112) and an opposing second surface (114);
• a spiral element (121), positioned on the first surface (112), wherein a head portion (322) of the spiral element (121) is positioned at an inner side of the spiral element (121), and a rear portion (324) of the spiral element (121) is positioned at an outer side of the spiral element (121);
• a first surrounding element (123), positioned on the first surface (112) and surrounding the spiral element (121), but not in contact with the spiral element (121);
• a first gap (125), positioned between the spiral element (121) and the first surrounding element (123);
• a plane element (131), positioned on the second surface (114) and comprising a notch (410);
• a second surrounding element (133), positioned on the second surface (114) and surrounding the plane element (131), but not in contact with the plane element (131), wherein the second surrounding element (133) further comprises a protruding portion (430) extending toward the notch (410);
• a second gap (135), positioned between the plane element (131) and the second surrounding element (133);
• a first via (141), penetrating through the dielectric layer (110), the head portion (322), and the protruding portion (430);
• a second via (143), penetrating through the dielectric layer (110), the plane element (131), and the first surrounding element (123);
• and
• a third via (145), penetrating through the dielectric layer (110), the plane element (131), and the first surrounding element (123).