A magnetron filter board for a microwave oven is disclosed. In embodiments, the magnetron filter board includes a printed circuit board with a first trace and a second trace on the printed circuit board. The first trace includes a first end for connecting to a magnetron and a second end for connecting to a power supply unit. The second trace also includes a first end for connecting to the magnetron and a second end for connecting to the power supply unit. The first trace and the second trace can be configured as a radio frequency band-gap filter that mitigates noise associated with the connection between the magnetron and the power supply unit.

A magnetron filter board for a microwave oven is disclosed. In embodiments, the magnetron filter board includes a printed circuit board with a first trace and a second trace on the printed circuit board. The first trace includes a first end for connecting to a magnetron and a second end for connecting to a power supply unit. The second trace also includes a first end for connecting to the magnetron and a second end for connecting to the power supply unit. The first trace and the second trace can be configured as a radio frequency band-gap filter that mitigates noise associated with the connection between the magnetron and the power supply unit.

An injection locked magnetron system based on filament injection is provided, which includes a magnetron, an excitation cavity, and a load. The magnetron is installed on the excitation cavity and connected to the excitation cavity, the excitation cavity is detachably connected to the load, the magnetron is provided with an injection antenna, and the injection antenna is used to receive an injected external signal and couple the injected external signal into the magnetron for realizing injection locking. The injected external signal is injected by a monopole antenna, and coupled into the magnetron resonant cavity through a magnetron filament, and the output microwave of the magnetron is output through the excitation cavity, and passes through the waveguide directional coupler, and is finally absorbed by the load, such that the output microwave of the magnetron can be locked by the injected external signal.

A microwave oven includes a frequency converter, a magnetron, a first conductor, and a second conductor. A power supply end of the fre-quency converter is connected to a power supply end of the magnetron by means of the first conductor, and a ground end of the frequency converter is connected to a ground end of the magnetron by means of the second conductor. The first conductor and a part of the second conductor are arranged in parallel, and the distance between the first conductor and the part of the second conductor is less than a preset distance. In this way, RE of the microwave oven can be reduced, and the microwave oven can thus meet the EMC standards.

A microwave oven includes a frequency converter, a magnetron, a first conductor, and a second conductor. A power supply end of the fre-quency converter is connected to a power supply end of the magnetron by means of the first conductor, and a ground end of the frequency converter is connected to a ground end of the magnetron by means of the second conductor. The first conductor and a part of the second conductor are arranged in parallel, and the distance between the first conductor and the part of the second conductor is less than a preset distance. In this way, RE of the microwave oven can be reduced, and the microwave oven can thus meet the EMC standards.

A nightvision system includes an underlying device that provides output light in a first spectrum. A transparent optical device transmits light in the first spectrum from the underlying device through the transparent optical device. The transparent optical device includes an active area of a semiconductor chip. The active area includes active elements that cause the underlying device to detect light from the underlying device and transparent regions formed in the active area which are transparent to the light in the first spectrum to allow light in the first spectrum to pass through from the underlying device to a user. An image processor processes brightness maps produced using light detected by the first plurality of active elements. A tunable filter array coupled to the image processor filters at least a portion of the input light into the underlying device the underlying device based on brightness map processing.

A nightvision system includes an underlying device that provides output light in a first spectrum. A transparent optical device transmits light in the first spectrum from the underlying device through the transparent optical device. The transparent optical device includes an active area of a semiconductor chip. The active area includes active elements that cause the underlying device to detect light from the underlying device and transparent regions formed in the active area which are transparent to the light in the first spectrum to allow light in the first spectrum to pass through from the underlying device to a user. An image processor processes brightness maps produced using light detected by the first plurality of active elements. A tunable filter array coupled to the image processor filters at least a portion of the input light into the underlying device the underlying device based on brightness map processing.

An adapting circuit is connected onto the high voltage end output of a magnetron driving power supply. In the adapting circuit, the high frequency part of current in the magnetron anode loop is converted into a part of the filament driving current. The high frequency part is removed by the two primary coils of a ferret core transformer and converted into a larger current on the secondary coil, which is rectified and filtered to increase the driving current in the magnetron filament loop. Two or more power supplies connected with the adapting circuits are connected together in parallel to drive a high power and high filament driving current magnetron with a correct compensation for its filament current.

An adapting circuit is connected onto the high voltage end output of a magnetron driving power supply. In the adapting circuit, the high frequency part of current in the magnetron anode loop is converted into a part of the filament driving current. The high frequency part is removed by the two primary coils of a ferret core transformer and converted into a larger current on the secondary coil, which is rectified and filtered to increase the driving current in the magnetron filament loop. Two or more power supplies connected with the adapting circuits are connected together in parallel to drive a high power and high filament driving current magnetron with a correct compensation for its filament current.

An adapting circuit is connected onto the high voltage end output of a magnetron driving power supply. In the adapting circuit, the high frequency part of current in the magnetron anode loop is converted into a part of the filament driving current. The high frequency part is removed by the two primary coils of a ferret core transformer and converted into a larger current on the secondary coil, which is rectified and filtered to increase the driving current in the magnetron filament loop. Two or more power supplies connected with the adapting circuits are connected together in parallel to drive a high power and high filament driving current magnetron with a correct compensation for its filament current.