Abstract: An antenna structure includes a first radiation element, a second radiation element, a third radiation element, an inductor, and a dielectric substrate. The first radiation element has a first feeding point. The second radiation element has a second feeding point. The second radiation element is adjacent to the first radiation element. The third radiation element is coupled through the inductor to the second radiation element. The first radiation element, the second radiation element, and the third radiation element are all disposed on the dielectric substrate.

Abstract: A three-dimensional printing apparatus includes a liquid tank capable of accommodating a photosensitive liquid. The liquid tank includes a film, a plurality of side walls, a plate and a motor. The film has a workpiece curing area. The plurality of side walls surrounds the film. The plate is capable of supporting the film and having at least one fluid tunnel extending from a first surface of the plate contacting the film to a second surface of the plate. The motor is connected to the liquid tank to incline the liquid tank. A gap is formed between the plat and one of the plurality of side walls of the liquid tank, and the film is communicated with an outside space via the gap.

Abstract: A communication system includes an STB (Set-Top Box), an LNB (Low Noise Block Down Converter), and a voltage converter. The voltage converter is coupled between the STB and the LNB. The voltage converter includes a DC (Direct Current) switch element, a voltage regulator, and a controller. The DC switch element is coupled between an input node and an output node. The voltage regulator is coupled between the input node and the output node. The controller detects an input voltage at the input node. If the input voltage is higher than or equal to a threshold voltage, the controller will open the DC switch element. If the input voltage is lower than the threshold voltage, the controller will close the DC switch element.

Abstract: A communication system includes an STB (Set-Top Box), an LNB (Low Noise Block Down Converter), and a voltage converter. The voltage converter is coupled between the STB and the LNB. The voltage converter includes a DC (Direct Current) switch element, a voltage regulator, and a controller. The DC switch element is coupled between an input node and an output node. The voltage regulator is coupled between the input node and the output node. The controller detects an input voltage at the input node. If the input voltage is higher than or equal to a threshold voltage, the controller will open the DC switch element. If the input voltage is lower than the threshold voltage, the controller will close the DC switch element.

Abstract: A circuit board structure for a low noise block down-converter is disclosed. The circuit board structure is used for transmitting a first radio-frequency signal and a second radio-frequency signal across each other, and includes a first substrate and a second substrate. The first substrate includes a first wire for transmitting the first radio-frequency signal, a first grounded wire formed in parallel to a side of the first wire, and a second grounded wire formed in parallel to another side of the first wire. The second substrate is electrically connected to the first substrate, and includes a second wire for transmitting the second radio-frequency signal, a third wire formed on a side of the second wire and a fourth wire formed on another side of the second wire.

Abstract: A circuit board structure for a low noise block down-converter is disclosed. The circuit board structure is used for transmitting a first radio-frequency signal and a second radio-frequency signal across each other, and includes a first substrate and a second substrate. The first substrate includes a first wire for transmitting the first radio-frequency signal, a first grounded wire formed in parallel to a side of the first wire, and a second grounded wire formed in parallel to another side of the first wire. The second substrate is electrically connected to the first substrate, and includes a second wire for transmitting the second radio-frequency signal, a third wire formed on a side of the second wire and a fourth wire formed on another side of the second wire.

Abstract: A low noise block down converter with integrated feedhorn (LNBF). A module frame provides an isolating structure and a first receiving portion, both disposed thereon. A first probe and insert element are disposed in the first receiving portion. A connector is mounted on the module frame. First and second printed circuit boards and the isolating structure are disposed in the module frame. The first printed circuit board is coupled to the second printed circuit board. A conducting wire passes through the isolating structure and connects the second printed circuit board to the connector.

Abstract: A low noise block down converter with integrated feedhorn (LNBF). A module frame provides an isolating structure and a first receiving portion, both disposed thereon. A first probe and insert element are disposed in the first receiving portion. A connector is mounted on the module frame. First and second printed circuit boards and the isolating structure are disposed in the module frame. The first printed circuit board is coupled to the second printed circuit board. A conducting wire passes through the isolating structure and connects the second printed circuit board to the connector.