Abstract: An antenna device includes a substrate, two T-shaped radiation portions, two feeding portions and an isolation structure. The substrate has an upper surface, a side surface and a lower surface. Two opposite ends of the side surface are connected to the upper surface and the lower surface, respectively. The two T-shaped radiation portions are located on the upper surface of the substrate. The two feeding portions are connected to the two T-shaped radiation portions, respectively, and the two feeding portions are located on the side surface of the substrate. The isolation structure is located on the upper surface of the substrate, and the isolation structure is disposed between the two T-shaped radiation portions.

Abstract: The present disclosure provides an antenna system, which includes a defected ground structure board and an antenna structure board. The defected ground structure board includes a first insulating plate and a defected ground structure layer, and the defected ground structure layer is disposed on the first insulating plate. The antenna structure board is disposed on the defected ground structure board. The antenna structure board includes at least one antenna body and a second insulating plate, the at least one antenna body is disposed on the second insulating plate, and the second insulating plate is disposed on the defected ground structure layer.

Abstract: An antenna structure includes an antenna radiator, a microstrip line, a flexible board, and a coaxial cable. The antenna radiator is used to receive and transmit wireless signals. The wireless signals include radio frequency signals. The microstrip line is coupled to the antenna radiator and is used to transmit the radio frequency signals. The flexible board is coupled to the microstrip line and is used to transmit the radio frequency signals. The coaxial cable is coupled to the flexible board and is used to transmit the radio frequency signals to a processor.

Abstract: An antenna structure includes an antenna radiator, a microstrip line, a flexible board, and a coaxial cable. The antenna radiator is used to receive and transmit wireless signals. The wireless signals include radio frequency signals. The microstrip line is coupled to the antenna radiator and is used to transmit the radio frequency signals. The flexible board is coupled to the microstrip line and is used to transmit the radio frequency signals. The coaxial cable is coupled to the flexible board and is used to transmit the radio frequency signals to a processor.

Abstract: A wireless communication apparatus includes a body, a first antenna, a second antenna, a sensor, a wireless transceiver, and a switch. Both of the first antenna and the second antenna are disposed in or on the body. The sensor is electrically connected to the first antenna and the second antenna for sensing whether an object is close to at least one of the first antenna and the second antenna to provide a sensing result. The wireless transceiver has a main antenna connection port. The switch is coupled to the wireless transceiver, the first antenna, and the second antenna for selecting one from the first antenna and the second antenna to be electrically connected to the main antenna connection port of the wireless transceiver according to the sensing result.

Abstract: A wireless communication apparatus includes a body, a first antenna, a second antenna, a sensor, a wireless transceiver, and a switch. Both of the first antenna and the second antenna are disposed in or on the body. The sensor is electrically connected to the first antenna and the second antenna for sensing whether an object is close to at least one of the first antenna and the second antenna to provide a sensing result. The wireless transceiver has a main antenna connection port. The switch is coupled to the wireless transceiver, the first antenna, and the second antenna for selecting one from the first antenna and the second antenna to be electrically connected to the main antenna connection port of the wireless transceiver according to the sensing result.