Abstract: A semiconductor device includes first nanostructures vertically separated from one another, a first gate structure wrapping around each of the first nanostructures, and second nanostructures vertically separated from one another. The semiconductor device also includes a second gate structure wrapping around the second nanostructures, a first drain/source structure coupled to a first end of the first nanostructures, a second drain/source structure coupled to both of a second end of the first nanostructures and a first end of the second nanostructures, and a third drain/source structure coupled to a second end of the second nanostructures. The first drain/source structure has a first doping type, the second and third drain/source structures have a second doping type, and the first doping type is opposite to the second doping type.

Abstract: An antenna device includes first antenna units, second antenna units, first switching circuits and second switching circuits. The first antenna units generate radio frequency (RF) signals operating at a first frequency. The second antenna units generate RF signals operating at a second frequency. The first frequency is larger than the second frequency. The first switching circuits selectively enable at least one of the first antenna units. Each of the first switching circuits includes a first switch element and a second switch element. The first switch element is connected in parallel with an inductor. The second switch element is connected in parallel with another inductor. The second switching circuits selectively enable at least one of the second antenna units.

Abstract: An antenna device includes antenna units, transmission lines and switching circuits. The antenna units are used to be operated in a directional mode or an omni-directional mode. The transmission lines are coupled to the antenna units. The switching circuits are coupled to the respective transmission lines, and are used for selectively connecting the transmission lines according to control signals. At least one transmission line is disconnected when the antenna units are operated in the directional mode. All the transmission lines are connected when the antenna units are operated in the omni-directional mode.

Abstract: An antenna device includes first antenna units, second antenna units, first switching circuits and second switching circuits. The first antenna units generate radio frequency (RF) signals operating at a first frequency. The second antenna units generate RF signals operating at a second frequency. The first frequency is larger than the second frequency. The first switching circuits selectively enable at least one of the first antenna units. Each of the first switching circuits includes a first switch element and a second switch element. The first switch element is connected in parallel with an inductor. The second switch element is connected in parallel with another inductor. The second switching circuits selectively enable at least one of the second antenna units.

Abstract: An antenna device includes antenna units, transmission lines and switching circuits. The antenna units are used to be operated in a directional mode or an omni-directional mode. The transmission lines are coupled to the antenna units. The switching circuits are coupled to the respective transmission lines, and are used for selectively connecting the transmission lines according to control signals. At least one transmission line is disconnected when the antenna units are operated in the directional mode. All the transmission lines are connected when the antenna units are operated in the omni-directional mode.

Abstract: A radio-frequency device includes a grounding element, a first antenna including a first parasitic element, a second antenna, a third antenna and a second parasitic element, wherein the grounding element is shared by the first, second and third antennas, the second parasitic element is electrically connected to the grounding element for guiding a first reflected signal from the first antenna to the second parasitic element, and the first parasitic element is electrically connected to the grounding element for guiding a second and third reflected signals from the second and third antennas to the first parasitic element, so as to enhance isolations of the first, second and third antennas.

Abstract: A radio-frequency device for a wireless communication device includes an antenna disposition area, a grounding unit, a first antenna and a second antenna. The first antenna includes a feed-in plate; a first radiating element, coupled to the feed-in plate and electrically connected to the grounding unit; and a metal branch, electrically connected to the grounding unit; wherein the grounding unit is shared by the first antenna and the second antenna, the feed-in plate is disposed in-between the metal branch and the first radiating element, and the metal branch is used for guiding a reflected signal generated from the second antenna to the metal branch so as to enhance isolations of the first antenna and the second antenna.

Abstract: A radio-frequency device includes a grounding element, a first antenna including a first parasitic element, a second antenna, a third antenna and a second parasitic element, wherein the grounding element is shared by the first, second and third antennas, the second parasitic element is electrically connected to the grounding element for guiding a first reflected signal from the first antenna to the second parasitic element, and the first parasitic element is electrically connected to the grounding element for guiding a second and third reflected signals from the second and third antennas to the first parasitic element, so as to enhance isolations of the first, second and third antennas.

Abstract: A radio-frequency device for a wireless communication device includes an antenna disposition area, a grounding unit, a first antenna and a second antenna. The first antenna includes a feed-in plate; a first radiating element, coupled to the feed-in plate and electrically connected to the grounding unit; and a metal branch, electrically connected to the grounding unit; wherein the grounding unit is shared by the first antenna and the second antenna, the feed-in plate is disposed in-between the metal branch and the first radiating element, and the metal branch is used for guiding a reflected signal generated from the second antenna to the metal branch so as to enhance isolations of the first antenna and the second antenna.