A meta-surface water load includes a waveguide section, a water load section and two meta-surface plates; the water load section is arranged at a rear end of the waveguide section; the two meta-surface plates are arranged opposite on inner walls of two narrow sides of the waveguide section; the water load section includes a metal casing, a ceramic partition, a water inlet and a water outlet; the metal casing is mounted at the rear end of the waveguide section; cooling liquid flows in the metal casing, entering from the water inlet and leaving from the water outlet; the ceramic partition is for separating interior of the waveguide section and interior of the metal casing; a relative permittivity of materials from front to rear of each meta-surface plate is progressively increased, so that microwave in the waveguide section is propagated to the water load section in one direction.

Heat exchanger assemblies for electronic devices are disclosed. A heat exchanger assembly may include a heat transfer body that has a face that forms open passageways. A cover structure may be attached to the heat transfer body in a manner to enclose the open passageways, thereby forming a heat exchanger assembly that includes enclosed fluid conduits. In this regard, the enclosed fluid conduits may form complex and intricate patterns within the heat exchanger assembly that are tailored to the heat requirements of a particular application. Heat exchanger assemblies as described herein may be thermally coupled to a center waveguide section of a spatial power-combining device. The enclosed fluid conduits may be tailored based on locations of amplifiers within the center waveguide section to provide improved thermal operation of the spatial power-combining device.

Provided is a switch device that can be used in a millimeter wave band and that can exhibit both low loss and high isolation characteristics. This switch device (1) includes: a post-wall waveguide (filter main body 1M) in which openings (AP1 to AP5) are formed in a broad wall (conductor layer 2); a cover (5) including a portion that blocks the openings (AP1 to AP5), the portion being made of an electrically conductive material; and a cover control mechanism (actuator 6) that switches between a first state in which the openings (AP1 to AP5) are blocked by the cover (5) and a second state in which the openings (AP1 to AP5) are open.

A microwave heating device with reflection protection belongs to a technical field of microwave applications. A first port of a circulator is connected to a microwave generator, and a second port of the circulator is connected to a microwave transmission device. A water load comprises a waveguide section, a metamaterial structure layer and the absorption tube. One end of the waveguide section is connected to a third port of the circulator, and the other end is sealed by a metal plate. The metamaterial structure layer is arranged in the waveguide section, and a center of the metamaterial structure layer has an accommodation space. The absorption tube is arranged along an internal wall of the accommodation space with a spiral extending form. Both ends of the absorption tube penetrate the waveguide section, and coolant flows in the absorption tube. Relative dielectric constants of the metamaterial structure layer gradually increase.

A high power isolator having coolant channel structure includes a ferrite which is installed inside a junction of a waveguide; a permanent magnet which is installed in an outer groove of an upper part of the ferrite; and a water-cooled cooling device having a spiral-shaped water channel structure which is installed on the upper part of the permanent magnet; wherein the ferrite, the permanent magnet, and the water-cooled cooling device are formed in a symmetrical pair up and down.

A tunable power absorbing termination for a waveguide transmission line includes a section of waveguide having a front power feed end, a back power extracting end, and guidewalls extending between the front and back end thereof. A coolant circulating dielectric taper extends into the section of waveguide in an inclined orientation relative to a guidewall of the section of waveguide such that the point end of the taper extends substantially to the front power feed end of the waveguide section. The inclined orientation of the dielectric taper creates a free volume of space adjacent the taper behind the front power feed end of the waveguide section into which a tuner element is introduced which is position adjustable within the free volume of space to provide the power absorbing termination with a tuning capability.

A meta-surface water load includes a waveguide section, a water load section and two meta-surface plates; the water load section is arranged at a rear end of the waveguide section; the two meta-surface plates are arranged opposite on inner walls of two narrow sides of the waveguide section; the water load section includes a metal casing, a ceramic partition, a water inlet and a water outlet; the metal casing is mounted at the rear end of the waveguide section; cooling liquid flows in the metal casing, entering from the water inlet and leaving from the water outlet; the ceramic partition is for separating interior of the waveguide section and interior of the metal casing; a relative permittivity of materials from front to rear of each meta-surface plate is progressively increased, so that microwave in the waveguide section is propagated to the water load section in one direction.

A tunable power absorbing termination for a waveguide transmission line includes a section of waveguide having a front power feed end, a back power extracting end, and guidewalls extending between the front and back end thereof. A coolant circulating dielectric taper extends into the section of waveguide in an inclined orientation relative to a guidewall of the section of waveguide such that the point end of the taper extends substantially to the front power feed end of the waveguide section. The inclined orientation of the dielectric taper creates a free volume of space adjacent the taper behind the front power feed end of the waveguide section into which a tuner element is introduced which is position adjustable within the free volume of space to provide the power absorbing termination with a tuning capability.

Heat exchanger assemblies for electronic devices are disclosed. A heat exchanger assembly may include a heat transfer body that has a face that forms open passageways. A cover structure may be attached to the heat transfer body in a manner to enclose the open passageways, thereby forming a heat exchanger assembly that includes enclosed fluid conduits. In this regard, the enclosed fluid conduits may form complex and intricate patterns within the heat exchanger assembly that are tailored to the heat requirements of a particular application. Heat exchanger assemblies as described herein may be thermally coupled to a center waveguide section of a spatial power-combining device. The enclosed fluid conduits may be tailored based on locations of amplifiers within the center waveguide section to provide improved thermal operation of the spatial power-combining device.

A microwave heating device with reflection protection belongs to a technical field of microwave applications. A first port of a circulator is connected to a microwave generator, and a second port of the circulator is connected to a microwave transmission device. A water load comprises a waveguide section, a metamaterial structure layer and the absorption tube. One end of the waveguide section is connected to a third port of the circulator, and the other end is sealed by a metal plate. The metamaterial structure layer is arranged in the waveguide section, and a center of the metamaterial structure layer has an accommodation space. The absorption tube is arranged along an internal wall of the accommodation space with a spiral extending form. Both ends of the absorption tube penetrate the waveguide section, and coolant flows in the absorption tube. Relative dielectric constants of the metamaterial structure layer gradually increase.