Abstract: An apparatus for producing silicon carbide crystal is provided and includes a composite structure formed by a plurality of graphite layers and silicon carbide seed crystals, wherein a density or thickness of each layer of graphite is gradually adjusted to reduce a difference of a thermal expansion coefficient and Young's modulus between the graphite layers and silicon carbide. The composite structure can be stabilized on a top portion or an upper cover of a crucible made of graphite, thereby preventing the silicon carbide crystal from falling off.

Abstract: A singing assisting system, a singing assisting method, and a non-transitory computer-readable medium including instructions for executing the method are provided. When the performed singing track does not appear in an ought-to-be-performed period, a singing-continuing procedure is executed. When the performed singing track is off pitch, a pitch adjustment procedure is executed.

Abstract: A mobile device includes an antenna structure. The antenna structure includes a main radiation element, a first parasitic element, and a second parasitic element. The main radiation element has a feeding point. The first parasitic element has a first grounding point. The first parasitic element is adjacent to the main radiation element, and the first grounding point is adjacent to the feeding point. The second parasitic element has a second grounding point. The second parasitic element is adjacent to an end of the main radiation element.

Abstract: A mobile device includes an antenna structure. The antenna structure includes a main radiation element, a first parasitic element, and a second parasitic element. The main radiation element has a feeding point. The first parasitic element has a first grounding point. The first parasitic element is adjacent to the main radiation element, and the first grounding point is adjacent to the feeding point. The second parasitic element has a second grounding point. The second parasitic element is adjacent to an end of the main radiation element.

Abstract: An antenna structure includes a ground element, a first radiation branch, a first ground branch, a second radiation branch, and a second ground branch. A first end of the first radiation branch is coupled to a signal source. A first end of the first ground branch is coupled to the ground element. A second end of the first ground branch is coupled to a second end of the first radiation branch. A first end of the second radiation branch is coupled to the second end of the first radiation branch. A first end of the second ground branch is coupled to the ground element. A second end of the second ground branch is coupled to a second end of the second radiation branch.

Abstract: A mobile device includes a ground element and an antenna structure. The antenna structure includes a ground branch, a feeding branch, a low-frequency radiation branch, and a high-frequency radiation branch. The feeding branch is coupled through the ground branch to the ground element. The low-frequency radiation branch is coupled to the feeding branch. The high-frequency radiation branch is coupled to the feeding branch. The low-frequency radiation branch has a meandering structure for reducing the SAR (Specific Absorption Rate) of the antenna structure.

Abstract: An antenna structure includes a ground element, a first radiation branch, and a second radiation branch. The first radiation branch has a first end and a second end. The first end of the first radiation branch is coupled to a signal source. The second end of the first radiation branch is open. The second radiation branch has a first end and a second end. The first end of the second radiation branch is coupled to the signal source. The second end of the second radiation branch is coupled to the ground element. The length of the second radiation branch is substantially equal to that of the first radiation branch.

Abstract: A mobile communication device includes an antenna element, a low-frequency blocking element, an isolation circuit, a first high-frequency blocking element and a second high-frequency blocking element. The antenna element converts a radio-frequency signal into an electromagnetic wave and includes a radiation portion and a parasitic portion. The parasitic portion and the radiation portion generate a first sensing signal and a second sensing signal in response to a proximity of an object. The low-frequency blocking element transmits the radio-frequency signal to the radiation portion. The isolation circuit is connected between the parasitic portion and a ground plane, and the isolation circuit blocks the first sensing signal and transmits the radio-frequency signal. The first high-frequency blocking element transmits the first sensing signal to a first sensing controller through a first metal line.

Abstract: A mobile device includes a metal back cover and a feeding antenna element. The metal back cover has a slot. The slot has an open end and a closed end. The feeding antenna element is coupled to a signal source, and extends across the slot. An antenna structure is formed by the metal back cover, the slot, and the feeding antenna element.

Abstract: A mobile communication device includes an antenna element, a low-frequency blocking element, an isolation circuit, a first high-frequency blocking element and a second high-frequency blocking element. The antenna element converts a radio-frequency signal into an electromagnetic wave and includes a radiation portion and a parasitic portion. The parasitic portion and the radiation portion generate a first sensing signal and a second sensing signal in response to a proximity of an object. The low-frequency blocking element transmits the radio-frequency signal to the radiation portion. The isolation circuit is connected between the parasitic portion and a ground plane, and the isolation circuit blocks the first sensing signal and transmits the radio-frequency signal. The first high-frequency blocking element transmits the first sensing signal to a first sensing controller through a first metal line.

Abstract: An antenna structure includes a ground element, a first radiation branch, a first ground branch, a second radiation branch, and a second ground branch. A first end of the first radiation branch is coupled to a signal source. A first end of the first ground branch is coupled to the ground element. A second end of the first ground branch is coupled to a second end of the first radiation branch. A first end of the second radiation branch is coupled to the second end of the first radiation branch. A first end of the second ground branch is coupled to the ground element. A second end of the second ground branch is coupled to a second end of the second radiation branch.

Abstract: An antenna structure includes a ground element, a first radiation branch, and a second radiation branch. The first radiation branch has a first end and a second end. The first end of the first radiation branch is coupled to a signal source. The second end of the first radiation branch is open. The second radiation branch has a first end and a second end. The first end of the second radiation branch is coupled to the signal source. The second end of the second radiation branch is coupled to the ground element. The length of the second radiation branch is substantially equal to that of the first radiation branch.

Abstract: A mobile communication device including an antenna element, a low-frequency blocking element, a first isolation circuit, a second isolation circuit and a high-frequency blocking element is provided. The antenna element converts a radio-frequency signal into an electromagnetic wave and generates a sensing signal in response to a proximity of an object. The antenna element includes a radiation portion and a parasitic portion which are spaced by a coupling gap. The low-frequency blocking element transmits the radio-frequency signal to the radiation portion. The first isolation circuit and a connection element are connected in series between the radiation portion and the parasitic portion, and the first isolation circuit blocks the radio-frequency signal. The second isolation circuit is electrically connected between the parasitic portion and a ground plane, and blocks the sensing signal.

Abstract: A mobile device includes a ground element and an antenna structure. The antenna structure includes a ground branch, a feeding branch, a low-frequency radiation branch, and a high-frequency radiation branch. The feeding branch is coupled through the ground branch to the ground element. The low-frequency radiation branch is coupled to the feeding branch. The high-frequency radiation branch is coupled to the feeding branch. The low-frequency radiation branch has a meandering structure for reducing the SAR (Specific Absorption Rate) of the antenna structure.

Abstract: An antenna system includes a first antenna and a second antenna. The first antenna includes a first feeding element and a first radiation element. The first feeding element is coupled to a first signal source. A first end of the first radiation element is coupled to a ground region, and a second end of the first radiation element is open and adjacent to the first feeding element. The second antenna includes a second feeding element and a second radiation element. The second feeding element is coupled to a second signal source. A first end of the second radiation element is coupled to the ground region, and a second end of the second radiation element is open and adjacent to the second feeding element.

Abstract: A mobile device at least includes an antenna system. The antenna system includes a first antenna, a second antenna, a first isolation element, and a second isolation element. The first antenna is excited by a first signal source. The second antenna is excited by a second signal source. A first end of the first isolation element is coupled to a ground region, and a second end of the first isolation element is open. A first end of the second isolation element is coupled to the ground region, and a second end of the second isolation element is open. The first isolation element and the second isolation element are both disposed between the first antenna and the second antenna, and are configured to enhance the isolation of the antenna system.

Abstract: A mobile communication device including an antenna element, a low-frequency blocking element, a first isolation circuit, a second isolation circuit and a high-frequency blocking element is provided. The antenna element converts a radio-frequency signal into an electromagnetic wave and generates a sensing signal in response to a proximity of an object. The antenna element includes a radiation portion and a parasitic portion which are spaced by a coupling gap. The low-frequency blocking element transmits the radio-frequency signal to the radiation portion. The first isolation circuit and a connection element are connected in series between the radiation portion and the parasitic portion, and the first isolation circuit blocks the radio-frequency signal. The second isolation circuit is electrically connected between the parasitic portion and a ground plane, and blocks the sensing signal.

Abstract: An antenna device includes a main body. The main body has a first radiator which has a first radiating portion, a third radiating portion, a second radiating portion connected with the first radiating portion and the third radiating portion to show a door shape, a fourth radiating portion extended outwards from the third radiating portion, and a fifth radiating portion extended downwardly from the third radiating portion, and stretched towards the same side of the third radiating portion as the second radiating portion, and a second radiator extended toward the third radiating portion from the first radiating portion. A feeding portion and a grounding portion are extended downwards from the second radiator side by side. A resonance element has an elongated first resonating portion spaced from the main body, and a second resonating portion extended perpendicularly from an end of the first resonating portion away from the main body.

Abstract: An antenna structure includes a low frequency radiator, a high frequency radiator, and a connecting element. The connecting element has a rear end and a front end opposite to the rear end. A feeding element and a grounding element are extended from the front end of the connecting element and arranged adjacent to each other. The low frequency radiator includes a substantially inverted-L shaped first radiating part extended from the rear end of the connecting element, a meander-like second radiating part extended frontward from a front end of the first radiating part, and a substantially lying U-shaped third radiating part with a rearward opening extended from a free end of the second radiating part. The high frequency radiator includes a first extension piece extended frontward from the front end of the connecting element and located under the second radiating part with space.

Abstract: An antenna structure includes a low frequency radiator, a high frequency radiator, and a connecting element. The connecting element has a rear end and a front end opposite to the rear end. A feeding element and a grounding element are extended from the front end of the connecting element and arranged adjacent to each other. The low frequency radiator includes a substantially inverted-L shaped first radiating part extended from the rear end of the connecting element, a meander-like second radiating part extended frontward from a front end of the first radiating part, and a substantially lying U-shaped third radiating part with a rearward opening extended from a free end of the second radiating part. The high frequency radiator includes a first extension piece extended frontward from the front end of the connecting element and located under the second radiating part with space.