Patent ID: 9088067
Filing Date: 2015-07-21
Classification: H01Q

Abstract:
1. A communication device, comprising: a ground element; and an antenna element, comprising: a first radiation element, wherein one end of the first radiation element is coupled to a signal source, and another end of the first radiation element is an open end; a second radiation element, comprising at least a first portion having a first end and a second end, and a second portion having a third end and a fourth end, wherein the first end of the first portion of the second radiation element is a shorted end coupled to the ground element, the fourth end of the second portion of the second radiation element is an open end, a length of the second radiation element is greater than a length of the first radiation element, and the second radiation element surrounds the open end of the first radiation element; and a control circuit, coupled between the second end of the first portion and the third end of the second portion of the second radiation element, wherein the control circuit provides at least two different impedances in such a manner that the antenna element operates in multiple bands.