Patent ID: 8902109

Claim:
A communication device, comprising: an assembly having an electronic module and a casing correspondingly installed to the electronic module, wherein each one of the electronic module and the casing defines a first area and a second area spaced apart from the first area thereof, the first area of the casing is defined by orthogonally projecting the first area of the electronic module onto the casing, and the second area of the casing is defined by orthogonally projecting the second area of the electronic module onto the casing; and an antenna structure, fixedly formed on the assembly and arranged in the assembly, having: a feeding antenna having a feeding portion and at least one grounding portion, wherein the feeding antenna is formed on one of the first areas of the assembly; and a stub antenna, spaced apart from the feeding antenna and configured without feeding portion and grounding portion, wherein the stub antenna is formed on one of the second areas of the assembly, and the relative position of the feeding antenna and the stub antenna is fixed, wherein the stub antenna is suitable for being excited and coupled by the feeding antenna, resonating at a resonance frequency of the feeding antenna, and causing the antenna structure in forming two hotspots in an operated frequency band, wherein a shortest distance between the feeding antenna and the stub antenna is defined as a coupling distance, and the coupling distance is larger than zero and smaller than or equal to the length of the stub antenna, whereby, an electric field value generated from the feeding antenna is reduced by the stub antenna being excited and coupled by the feeding antenna and resonating at the resonance frequency of the feeding antenna, and the feeding antenna formed on one of the first areas and the stub antenna formed on one of the second areas are configured to reduce a specific absorption rate (SAR) of the antenna structure.