Abstract: A wave receiving plate is pivotably supported by a support device in the wave force generation system and includes a flexible plate in at least a part of the wave receiving plate.

Abstract: A wave receiving plate is pivotably supported by a support device in the wave force generation system and includes a flexible plate in at least a part of the wave receiving plate.

Abstract: In a low noise block downconverter converting a right-hand (or horizontally) polarized wave signal and a left-hand (or vertically) polarized wave signal to intermediate frequency signals, one of two filters for removal of interference waves from the intermediate frequency signals on the right-hand (or horizontally) polarized wave side and on the left-hand (or vertically) polarized wave side is formed of a plurality of stages of parallel resonant trap circuits having capacitors and inductors connected in parallel, respectively, which exhibit attenuation characteristic that is wideband and steep and allows great attenuation in the reject band. Thus, it is possible to provide a low noise block downconverter employing an LPF that achieves attenuation characteristic being wideband and steep and allowing great attenuation in the reject band with the least possible number of inductor components that would otherwise increase the cost.

Abstract: A low noise block down converter accommodates two local oscillators within one shielding chamber in a metal shielding box and has a conductive bar provided between two dielectric resonators included in the local oscillators respectively. The conductive bar prevents electromagnetic coupling between the two dielectric resonators. Therefore, the device dimension can be made small compared to the conventional case in which two local oscillators are completely separated from each other by a metal wall.

Abstract: A power supply circuit of a low noise block converter (LNB) includes a plurality of output voltage regulators. A first output voltage regulator, a local oscillator circuit, a second output voltage regulator, and an LNA are connected in series in a direction in which a power supply current flows. Therefore, a voltage adjustment width of the output voltage regulator can be reduced and a power loss can be reduced. A value of current flowing in the power supply circuit can also be decreased. Accordingly, an LNB with a reduced power consumption can be realized.

Abstract: In a mixer of a converter, a bipolar transistor is connected between the base of a bipolar transistor and a positive power-supply node within a driving circuit, as a temperature characteristic compensating circuit. When the ambient temperature of the driving circuit rises, collector current of the transistor is increased due to the temperature characteristic of the transistor. This lowers the drain voltage of a high electron mobility transistor. However, collector current of the transistor within the temperature characteristic compensating circuit is also increased, increasing the voltage at a point, so that the increase in the collector current of the transistor is suppressed. This results in a stabilized drain voltage of the transistor. Therefore, the low noise down-converter can supply a stable voltage to a transistor performing frequency conversion, without any effect from the change in the ambient temperature.

Abstract: A power supply circuit of a low noise block converter (LNB) includes a plurality of output voltage regulators. A first output voltage regulator, a local oscillator circuit, a second output voltage regulator, and an LNA are connected in series in a direction in which a power supply current flows. Therefore, a voltage adjustment width of the output voltage regulator can be reduced and a power loss can be reduced. A value of current flowing in the power supply circuit can also be decreased. Accordingly, an LNB with a reduced power consumption can be realized.

Abstract: A low noise block down converter accommodates two local oscillators within one shielding chamber in a metal shielding box and has a conductive bar provided between two dielectric resonators included in the local oscillators respectively. The conductive bar prevents electromagnetic coupling between the two dielectric resonators. Therefore, the device dimension can be made small compared to the conventional case in which two local oscillators are completely separated from each other by a metal wall.

Abstract: In a low noise block downconverter converting a right-hand (or horizontally) polarized wave signal and a left-hand (or vertically) polarized wave signal to intermediate frequency signals, one of two filters for removal of interference waves from the intermediate frequency signals on the right-hand (or horizontally) polarized wave side and on the left-hand (or vertically) polarized wave side is formed of a plurality of stages of parallel resonant trap circuits having capacitors and inductors connected in parallel, respectively, which exhibit attenuation characteristic that is wideband and steep and allows great attenuation in the reject band. Thus, it is possible to provide a low noise block downconverter employing an LPF that achieves attenuation characteristic being wideband and steep and allowing great attenuation in the reject band with the least possible number of inductor components that would otherwise increase the cost.

Abstract: In a mixer of a converter, a bipolar transistor is connected between the base of a bipolar transistor and a positive power-supply node within a driving circuit, as a temperature characteristic compensating circuit. When the ambient temperature of the driving circuit rises, collector current of the transistor is increased due to the temperature characteristic of the transistor. This lowers the drain voltage of a high electron mobility transistor. However, collector current of the transistor within the temperature characteristic compensating circuit is also increased, increasing the voltage at a point, so that the increase in the collector current of the transistor is suppressed. This results in a stabilized drain voltage of the transistor. Therefore, the low noise down-converter can supply a stable voltage to a transistor performing frequency conversion, without any effect from the change in the ambient temperature.