An embodiment of a microwave heating apparatus includes a solid state microwave energy source, a chamber, a dielectric resonator antenna with an exciter dielectric resonator and a feed structure, and one or more additional dielectric resonators each positioned within a distance of the exciter resonator to form a dielectric resonator antenna array. The distance is selected so that each additional resonator is closely capacitively coupled with the exciter resonator. The feed structure receives an excitation signal from the microwave energy source. The exciter resonator is configured to produce a first electric field in response to the excitation signal, and the first electric field may directly impinge on the additional resonator(s). Impingement of the first electric field may cause each of the additional resonators to produce a second electric field. The electric fields are directed into the chamber to increase the thermal energy of a load within the chamber.

An embodiment of a microwave heating apparatus includes a solid state microwave energy source, a first dielectric resonator antenna that includes a first exciter dielectric resonator and a first feed structure in proximity to the first exciter dielectric resonator, one or more additional dielectric resonators stacked above the top surface of the first exciter dielectric resonator to form a vertically-stacked dielectric resonator antenna array. The first feed structure is electrically coupled to the microwave energy source to receive a first excitation signal, and the first exciter dielectric resonator is configured to produce a first electric field in response to the excitation signal provided to the first feed structure.

A modular microwave power supply comprises a plurality of microwave power supply modules and a plurality of isolating diodes. To upgrade the output power of the modular microwave power supply, the plurality of microwave power supply modules are connected isolatively in common to a magnetron load by the plurality of isolating diodes, such that power combining of the plurality of microwave power supply modules is achieved, and the efficiency as well as the accumulated-heat dissipating ability of the modular microwave power supply are as good as each of the plurality of microwave power supply modules.

A microwave heating device includes a waveguide, a metal plate, a magnetron, a heat generating plate, a thermal insulation member and an adjusting member. The waveguide has a waveguide space, in which a sidewall of the waveguide has an opening communicating the waveguide space. The metal plate covers the opening to seal the waveguide space. The magnetron is configured to generate microwaves, in which an output end of the magnetron protrudes into the waveguide space. The heat generating plate is disposed in the waveguide space and is contacted with the metal plate, in which the heat generating plate is configured to absorb microwaves. The thermal insulation member is partially covers the heat generating plate. The adjusting member is disposed in the waveguide space and is located under the heat generating plate.

A microwave heating apparatus includes a solid state microwave energy source, a first dielectric resonator antenna that includes a first exciter dielectric resonator and a first feed structure in proximity to the first exciter dielectric resonator, one or more additional dielectric resonators stacked above the top surface of the first exciter dielectric resonator to form a vertically-stacked dielectric resonator antenna array. The first feed structure is electrically coupled to the microwave energy source to receive a first excitation signal, and the first exciter dielectric resonator is configured to produce a first electric field in response to the excitation signal provided to the first feed structure.

A modular microwave power supply comprises a plurality of microwave power supply modules and a plurality of isolating diodes. To upgrade the output power of the modular microwave power supply, the plurality of microwave power supply modules are connected isolatively in common to a magnetron load by the plurality of isolating diodes, such that power combining of the plurality of microwave power supply modules is achieved, and the efficiency as well as the accumulated-heat dissipating ability of the modular microwave power supply are as good as each of the plurality of microwave power supply modules.

An embodiment of a microwave heating apparatus includes a solid state microwave energy source, a chamber, a dielectric resonator antenna with an exciter dielectric resonator and a feed structure, and one or more additional dielectric resonators each positioned within a distance of the exciter resonator to form a dielectric resonator antenna array. The distance is selected so that each additional resonator is closely capacitively coupled with the exciter resonator. The feed structure receives an excitation signal from the microwave energy source. The exciter resonator is configured to produce a first electric field in response to the excitation signal, and the first electric field may directly impinge on the additional resonator(s). Impingement of the first electric field may cause each of the additional resonators to produce a second electric field. The electric fields are directed into the chamber to increase the thermal energy of a load within the chamber.

A microwave oven including a frozen food defrost mode and a food drying function according to the present invention includes: a body formed with a space therein; a humidity sensor measuring a humidity value of the space; a magnetron emitting microwaves towards the space; a power transformer supplying power for operating a heater of the magnetron; a high voltage transformer providing power for operating a resonator of the magnetron; a power supply unit supplying power to the power transformer and the high voltage transformer; an output adjusting unit for selecting and adjusting so that the magnetron outputs any one of a plurality of set output levels; and a control unit controlling an output of the microwave according to the output level selected in the output adjusting unit, blocking the power supplied to the magnetron when the humidity value input from the humidity sensor remarkably increases in short time.

A household or commercial appliance includes a couple magnetrons having relative anodes and cathodes, and a power unit comprising a high voltage circuit. The high voltage circuit comprises: a high voltage transformer comprising a primary winding connected to an alternating voltage source and a secondary high-voltage winding providing an alternating high voltage having a period comprising two half periods, a couple of half-wave voltage doubler circuits, and first and second unidirectional conducting devices. The first and second unidirectional conducting devices being configured to cause the half-wave voltage doubler circuits to supply, during a period of the alternating high-voltage the doubled high-voltage to the cathode of the respective magnetron alternately.

One or more example embodiments relates to an X-ray generator comprising a high-voltage transformer, the high-voltage transformer including a core; a primary winding module including the primary windings enclosing a core in a primary section in a shape of a coil; and a secondary winding module including secondary windings and a plastic section made from a plastic, the secondary windings enclosing the core in a secondary section in the shape of the coil, the plastic section at least one of enclosing or comprising the secondary windings, the plastic forming an electrical insulator, wherein the primary section and the secondary section have a common overlap area, and the high-voltage transformer is configured to at least one of generate a voltage of at least 70 kV with respect to ground or act as a unipolar high-voltage transformer to output a voltage of at least 70 kV.