Communication device
A communication device includes a ground plane, an antenna structure, a cable, a connection metal element, and a dielectric substrate. The antenna structure has a feeding point. The cable includes a feeding conductor and a grounding conductor. The feeding conductor is coupled to the feeding point. The grounding conductor includes a first conductive region and a second conductive region. The connection metal element is coupled between the first conductive region and the second conductive region of the grounding conductor. The antenna structure and the connection metal element are disposed on the dielectric substrate. The cable is adjacent to the ground plane. Neither the first conductive region nor the second conductive region of the grounding conductor is coupled to the ground plane.
1 . A communication device, comprising:
a ground plane;
an antenna structure, having a feeding point;
a cable, comprising a feeding conductor and a grounding conductor, wherein the feeding conductor is coupled to the feeding point, and the grounding conductor comprises a first conductive region and a second conductive region;
a connection metal element, coupled between the first conductive region and the second conductive region of the grounding conductor; and
a dielectric substrate, wherein the antenna structure and the connection metal element are disposed on the dielectric substrate;
wherein the cable is adjacent to the ground plane, and neither the first conductive region nor the second conductive region of the grounding conductor is coupled to the ground plane.
2 . The communication device as claimed in claim 1 , wherein the first conductive region and the second conductive region of the grounding conductor are different from each other.
3 . The communication device as claimed in claim 1 , wherein the cable is a coaxial cable, the feeding conductor is a central conductive line of the coaxial cable, and the grounding conductor is a conductive housing of the coaxial cable.
4 . The communication device as claimed in claim 1 , wherein the cable further comprises a nonconductive skin element, and the nonconductive skin element is configured to cover the grounding conductor except for the first conductive region and the second conductive region.
5 . The communication device as claimed in claim 1 , wherein the connection metal element substantially has an inverted U-shape or a meandering shape.
6 . The communication device as claimed in claim 1 , wherein the antenna structure covers a first frequency band, a second frequency band, and a third frequency band, the first frequency band is from 2400 MHz to 2500 MHz, the second frequency band is from 5150 MHz to 5850 MHz, and the third frequency band is from 5925 MHz to 7125 MHz.
7 . The communication device as claimed in claim 6 , wherein a length of the connection metal element is from 0.25 to 0.6 wavelength of the first frequency band.
8 . The communication device as claimed in claim 6 , wherein the antenna structure comprises:
a feeding radiation element, coupled to the feeding point;
a first radiation element, coupled to the feeding radiation element;
a second radiation element, coupled to the feeding radiation element, wherein the first radiation element and the second radiation element substantially extend in opposite directions; and
a shorting radiation element, wherein the feeding radiation element is further coupled through the shorting radiation element to the first conductive region of the grounding conductor.
9 . The communication device as claimed in claim 8 , wherein a total length of the feeding radiation element and the first radiation element is substantially equal to 0.25 wavelength of the first frequency band.
10 . The communication device as claimed in claim 8 , wherein a total length of the feeding radiation element and the second radiation element is substantially equal to 0.25 wavelength of the second frequency band.