Abstract: A frequency up-conversion device and a signal transmission system are provided. A frequency up-conversion device includes a first diplexer, a divider, a digital channel stacking circuit, an up-conversion mixer, and a second diplexer. The first diplexer divides a first signal into a second signal and a third signal. The digital channel stacking circuit transforms the second signal to a fourth signal. The up-conversion mixer mixes the fourth signal and an up-conversion oscillating signal to generate a fifth signal. The second diplexer receives the fifth signal and the third signal to generate a sixth signal for output.

Abstract: A frequency up-conversion device and a signal transmission system are provided. A frequency up-conversion device includes a first diplexer, a divider, a digital channel stacking circuit, an up-conversion mixer, and a second diplexer. The first diplexer divides a first signal into a second signal and a third signal. The digital channel stacking circuit transforms the second signal to a fourth signal. The up-conversion mixer mixes the fourth signal and an up-conversion oscillating signal to generate a fifth signal. The second diplexer receives the fifth signal and the third signal to generate a sixth signal for output.

Abstract: A horn antenna module is provided. The horn antenna module includes a waveguide and an antenna cover. The waveguide includes a plurality of waveguide paths. The antenna cover covers one end of the waveguide. The antenna cover includes a plurality of protrusions and a bottom surface. The protrusions are formed on the bottom surface. The protrusions correspond one-to-one with the waveguide paths. Each protrusion has a top surface and a lateral surface. The lateral surface is located between the top surface and the bottom surface. The top surface is planar.

Abstract: A horn antenna module is provided. The horn antenna module includes a waveguide and an antenna cover. The waveguide includes a plurality of waveguide paths. The antenna cover covers one end of the waveguide. The antenna cover includes a plurality of protrusions and a bottom surface. The protrusions are formed on the bottom surface. The protrusions correspond one-to-one with the waveguide paths. Each protrusion has a top surface and a lateral surface. The lateral surface is located between the top surface and the bottom surface. The top surface is planar.

Abstract: A waterproof part for a feedhorn includes a first waterproof unit having a first interface for generating a first reflected wave and a first transmitted wave when a satellite signal incidents the first interface, and a second waterproof unit covering on the first waterproof unit and having a second interface for generating a second reflected wave and a second transmitted wave when the first transmitted wave incidents the second interface, wherein the first and second reflected waves are substantially out-of-phase to substantially cancel the first and second reflected waves.

Abstract: A waterproof part for a feedhorn includes a first waterproof unit having a first interface for generating a first reflected wave and a first transmitted wave when a satellite signal incidents the first interface, and a second waterproof unit covering on the first waterproof unit and having a second interface for generating a second reflected wave and a second transmitted wave when the first transmitted wave incidents the second interface, wherein the first and second reflected waves are substantially out-of-phase to substantially cancel the first and second reflected waves.

Abstract: An assembly of a low-noise block converter and a filter for a satellite antenna includes a low-noise block converter, a filter, and a connecting component. The low-noise block converter includes an output circuit, and the filter includes a filtering circuit. The connecting component includes a sleeve part for engaging threadedly the low-noise block converter and the filter, and a core extending through the sleeve part and interconnecting electrically the output circuit and the filtering circuit. By virtue of the sleeve part of the connecting component, connection between the low-noise block converter and the filter can be reinforced to reduce interference. The sleeve part can also serve as a ground circuit between the low-noise block converter and the filter so as to shorten a ground path, thereby reducing signal loss.

Abstract: An assembly of a low-noise block converter and a filter for a satellite antenna includes a low-noise block converter, a filter, and a connecting component. The low-noise block converter includes an output circuit, and the filter includes a filtering circuit. The connecting component includes a sleeve part for engaging threadedly the low-noise block converter and the filter, and a core extending through the sleeve part and interconnecting electrically the output circuit and the filtering circuit. By virtue of the sleeve part of the connecting component, connection between the low-noise block converter and the filter can be reinforced to reduce interference. The sleeve part can also serve as a ground circuit between the low-noiseblock converter and the filter so as to shorten a ground path, thereby reducing signal loss.

Abstract: An assembly of a low-noise block converter and a filter for a satellite antenna includes a low-noise block converter, a filter, and a connecting component. The low-noise block converter includes an output circuit, and the filter includes a filtering circuit. The connecting component includes a sleeve part for engaging threadedly the low-noise block converter and the filter, and a core extending through the sleeve part and interconnecting electrically the output circuit and the filtering circuit. By virtue of the sleeve part of the connecting component, connection between the low-noise block converter and the filter can be reinforced to reduce interference. The sleeve part can also serve as a ground circuit between the low-noise block converter and the filter so as to shorten a ground path, thereby reducing signal loss.

Abstract: A band pass filter includes a first micro-strip port for receiving a radio-frequency signal, a second micro-strip port for outputting a filtered radio-frequency signal and comprising at least one resonating cavity formed for enhancing rejecting effect of image frequency corresponding to the filtered radio-frequency signal, and a plurality of resonators arranged between the first micro-strip port and the second micro-strip port for performing band pass filtering on the radio-frequency signal to generate the filtered radio-frequency signal.

Abstract: A band rejection filter capable of reducing harmonics includes a first signal end, a second signal end, a high pass filter coupled between the first signal end and the second signal end for performing high pass filtering on signals transmitted between the first signal end and the second signal end, and a low pass filter coupled between the first signal end and the second signal end for performing low pass filtering on signals transmitted between the first signal end and the second signal end. The low pass filter includes a plurality of non-magnetic-core inductors coupled in a sequence between the first signal end and the second signal end, and a plurality of capacitors respectively coupled between an intersection of adjacent non-magnetic-core inductors of the plurality of non-magnetic-core inductors and a ground end.

Abstract: An assembly of a low-noise block converter and a filter for a satellite antenna includes a low-noise block converter, a filter, and a connecting component. The low-noise block converter includes an output circuit, and the filter includes a filtering circuit. The connecting component includes a sleeve part for engaging threadedly the low-noise block converter and the filter, and a core extending through the sleeve part and interconnecting electrically the output circuit and the filtering circuit. By virtue of the sleeve part of the connecting component, connection between the low-noise block converter and the filter can be reinforced to reduce interference. The sleeve part can also serve as aground circuit between the low-noise block converter and the filter so as to shorten a ground path, thereby reducing signal loss.

Abstract: A band rejection filter capable of reducing harmonics includes a first signal end, a second signal end, a high pass filter coupled between the first signal end and the second signal end for performing high pass filtering on signals transmitted between the first signal end and the second signal end, and a low pass filter coupled between the first signal end and the second signal end for performing low pass filtering on signals transmitted between the first signal end and the second signal end. The low pass filter includes a plurality of non-magnetic-core inductors coupled in a sequence between the first signal end and the second signal end, and a plurality of capacitors respectively coupled between an intersection of adjacent non-magnetic-core inductors of the plurality of non-magnetic-core inductors and a ground end.

Abstract: A band pass filter includes a first micro-strip port for receiving a radio-frequency signal, a second micro-strip port for outputting a filtered radio-frequency signal and comprising at least one resonating cavity formed for enhancing rejecting effect of image frequency corresponding to the filtered radio-frequency signal, and a plurality of resonators arranged between the first micro-strip port and the second micro-strip port for performing band pass filtering on the radio-frequency signal to generate the filtered radio-frequency signal.

Abstract: A down-converter includes two low-noise amplifiers, a 90-degree hybrid coupler, and a down-converting circuit. The 90-degree hybrid coupler is coupled to the two low-noise amplifiers for transforming a first amplified signal and a second amplified signal into a first coupler output signal and a second coupler output signal. The 90-degree hybrid coupler includes a coupler main body, a first transmission line, and a second transmission line, wherein the first and the second transmission lines are coupled to the coupler main body. The coupler main body includes two input ports respectively coupled to the two low-noise amplifiers and two output ports for respectively outputting the first and the second coupler output signals. The first and the second transmission lines are each an open-circuited transmission line or a short-circuited transmission line. The down-converting circuit is coupled to the two output ports of the 90-degree hybrid coupler.

Abstract: A down-converter includes two low-noise amplifiers, a 90-degree hybrid coupler, two first matching circuits, and a down-converting circuit. The two low-noise amplifiers respectively amplify a first beacon signal and a second beacon signal to generate a first amplified signal and a second amplified signal. The 90-degree hybrid coupler includes two input ports and two output ports for transforming the first amplified signal and the second amplified signal into a first coupler output signal and a second coupler output signal. The two first matching circuits are respectively coupled to the two input ports or the two output ports of the 90-degree hybrid coupler and each first matching circuit has a first tuning mechanism disposed in one side of the first matching circuit and not contacting the first matching circuit. The down-converting circuit performs a frequency down-conversion on the first coupler output signal and the second coupler output signal.