Patent ID: 8253630

Claim:
A microstrip antenna located on a substrate having a first surface and a second surface opposite to the first surface, the microstrip antenna comprising: a feeding portion located on the first surface of the substrate, to feed electromagnetic signals; a radiating portion located on the first surface of the substrate, to radiate an electromagnetic signal, the radiating portion comprising: a first radiating part of rectangular strip with a first end connected to the feeding portion; a second radiating part of rectangular strip with a first end connected to a second end of the first radiating part, wherein a width of the second radiating part is greater than that of the first radiating part; a third radiating part of rectangular strip with a first end connected to a second end of the second radiating part, wherein a width of the third radiating part is the same as that of the first radiating part, and the first radiating part, the second radiating part, and the third radiating part are arranged in series; and a fourth radiating part of rectangular strip perpendicularly connected to a second end of the third radiating part, at a substantial center of the fourth radiating part; a grounding portion located on the second surface of the substrate and rectangularly shaped; wherein a width of the second radiating part that is parallel to an axis of the third radiating part is greater than a width of the fourth radiating part that is parallel to the axis of the third radiating part; and wherein a width of the fourth radiating part that is perpendicular to the axis of the third radiating part is greater than a width of the second radiating part that is perpendicular to the axis of the third radiating part.