Patent ID: 9401544
Filing Date: 2016-07-26
CPC Classification: H01Q

Claim Text:
1. A quad-band internal antenna, comprising: an antenna radiating element having a low-frequency branch section and a high frequency branch section separated from the low-frequency branch section by a T-shaped slot, the high frequency branch section being wider and shorter than the low-frequency branch section, and the high frequency branch is further separated into two parts by the T-shaped slot; a first slotted hole on a printed circuit board, wherein the first slotted hole overlaps with the low-frequency branch section of the antenna radiating element in a height direction and has a length close to a quarter-wavelength of a high frequency band; a second slotted hole arranged on the printed circuit board, wherein the second slotted hole overlaps with the high frequency branch section of the antenna radiating element in the height direction and has a length shorter than the length of the first slotted hole, wherein the first slotted hole is arranged along a direction substantially perpendicular to a current flow direction within the printed circuit board, wherein the second slotted hole is arranged between a ground pin and a feed pin of the antenna radiating element, and wherein both the first slotted hole and the second slotted hole are open slotted holes with an open end.