Multi-slot antenna and low-profile phased array antenna using the same

A multi-slot antenna, comprising:

• a ground plane;
• a driven slot positioned on the ground plane and extending along a first direction;
• a first parasitic slot positioned on the ground plane and at a first side of the driven slot, wherein the first parasitic slot extends along the first direction and a second direction different than the first direction;
• a second parasitic slot positioned on the ground plane and at the first side of the driven slot, wherein the second parasitic slot extends along the first direction and the second direction;
• a third parasitic slot positioned on the ground plane and at a second side of the driven slot opposite the first side, wherein a first end of the driven slot is located between the first parasitic slot and the third parasitic slot, and the third parasitic slot at least extends along the first direction and the second direction, and wherein the first parasitic slot and the third parasitic slot are symmetrical about the driven slot;
• and
• a fourth parasitic slot positioned on the ground plane and at the second side of the driven slot, wherein a second end of the driven slot is opposite the first end and located between the second parasitic slot and the fourth parasitic slot, and the fourth parasitic slot at least extends along the first direction and the second direction, and wherein the second parasitic slot and the fourth parasitic slot are symmetrical about the driven slot;
• wherein each of the first parasitic slot, the second parasitic slot, the third parasitic slot, and the fourth parasitic slot presents an L-shape by extending along the first direction and the second direction and comprises:
• a first extending portion extending along the first direction;
• and
• a second extending portion connected to the first extending portion and extending along the second direction, wherein the first extending portion is shorter than the second extending portion;
• wherein the first extending portion of the first parasitic slot and the first extending portion of the second parasitic slot are located between the second extending portion of the first parasitic slot and the second extending portion of the second parasitic slot.