Patent ID: 9543652
Date: 2017-01-10
CPC Classifications: H01Q

Claim:
1. A loop antenna, comprising: a first loop section, comprising a first end and a second end, wherein the first loop section surrounds and defines an empty area; a second loop section, comprising a third end and a fourth end, the third end is connected to the second end, wherein the second loop section surrounds the first loop section, an annular groove is formed between the first loop section and the second loop section, the annular groove surrounds the first loop section in a rectangular path and has four sides, and a width of the annular groove is between 1 mm and 10 mm; a third loop section, comprising a fifth end and a sixth end, the fifth end connected to the fourth end, wherein the third loop section surrounds the second loop section, and a width of a gap between the third loop section and the second loop section is smaller than the width of each of the four sides of the annular groove; and a first short element and second short element, wherein the second loop section is rectangular and comprising a first major side and a second major side, the first major side is parallel to the second major side, the first short element is connected to the first major side and the second major side, the second short element is connected to the first major side and the second major side, and the empty area is located between the first short element and the second short element.