A microwave heating apparatus for heating a load by means of microwaves is provided. The microwave heating apparatus comprises a cavity arranged to receive a piece of food to be heated, a first microwave supply system configured to supply microwaves at the cavity bottom for energizing a browning function in the cavity, a second microwave supply system configured to supply microwaves into the cavity for exciting cavity modes and a control unit configured to control the first and second microwave supply systems based on a food category and/or a cooking program. The first supply system comprises at least one microwave source and at least one antenna arranged in a lower part of the cavity and the second microwave supply system comprises at least one microwave source and at least one feeding port arranged in an upper part of the cavity. The present invention is advantageous in that a microwave heating apparatus with an improved crisp function is provided.

This disclosure relates to a microwave heating device and a method for operating a microwave heating device. The microwave heating device comprises at least two radiating portions that are adapted to radiate microwaves to the heating chamber and can be operated according to operational configurations that differ in frequency and/or in phase shift(s) between the radiated microwaves. A learning procedure can be executed in relation with at least one product positioned in the heating chamber. The learning procedure can be executed by changing frequency and phase shift(s) to sequentially operate the at least two radiating portions in a plurality of operational configurations, in such a way that, for each frequency, the at least two radiating portions are operated in a number of operational configurations that differ in phase shift(s) from one another. An energy efficiency can be calculated for each of said plurality of operational configurations and the obtained data are saved. A heating procedure may be executed after the learning procedure. In the heating procedure, the at least two radiating portions are operated according to at least one operational configuration that is selected on the basis of the data obtained in the learning procedure.

This disclosure relates to a microwave heating device and a method for operating a microwave heating device. The microwave heating device comprises at least two radiating portions that are adapted to radiate microwaves to the heating chamber and can be operated according to a plurality of operational configurations that differ in frequency and/or in phase shift(s) between the radiated microwaves. Data of energy efficiency, as a function of operational configurations, can be obtained for a product in the heating chamber. For example, energy efficiency data are obtained through a learning procedure. The obtained data can be processed to select one or more operational configurations ranking high in energy efficiency and a heating procedure for the product inside the heating chamber can be executed by operating the at least two radiating portions according to the selected one or more operational configurations.

The microwave power is distributed to microwave radiation elements arranged rotationally symmetrically around a reference line on a plane on a top face side of a heating chamber by advancing a feeding phase with a phase difference of 360°/2N clockwise or counterclockwise in turn.

A frequency reconfigurable phased array system comprises a signal generator outputting a power signal with an adjustable frequency, a plurality of radio frequency (RF) modules receiving the power signal, a control module generating excitation mode parameter sets and material processing event sets, a first database storing the excitation mode parameter sets, and a second database storing the material processing event sets. The control module generates a material processing schedule by selecting one of the material processing event sets based on a material recipe, an average power, and a total time of a material, and controls a signal frequency of the signal generator according to the material processing schedule and the excitation mode parameter sets, and a RF phase and a RF power of each of the RF modules, to have the RF modules generating a power signal.

The invention relates to the field of microwave emitting equipment, in particular to microwave oscillators. The proposed variants of an oscillator and a matrix-type microwave oscillator enable to efficiently direct microwave radiation from one or more microwave sources and sum up microwave radiations, thus ensuring high values of efficiency and output power, superior functional capabilities of the device, a high degree of synchronization of radiations emitted by said microwave sources. The microwave oscillator comprises a microwave source and a resonator with a microwave channel made therein. The resonator comprises a box and a base electrically connected to each other, while the microwave channel accommodates a suppressing means for suppressing a back wave. The matrix-type oscillator comprises a plurality of said microwave oscillators electrically connected to each other.

The present disclosure relates to a drawer-type microwave oven comprising a cooker body, a door, a first slide rail, a second slide rail, a driving motor, a magnetron and a first fan. The cooker body includes a housing and a cooking cavity provided within the housing. The magnetron and the first fan are provided in the third spacing region, the housing is provided with an air inlet mesh that is in communication with the third spacing region. Cold air entering from the air inlet mesh is guided to flow through the magnetron and the driving motor in sequence when the first fan works. When the drawer-type microwave oven works, the first fan draws the cold air into the third spacing region through the air inlet mesh, and the cold air flows through the magnetron and the driving motor in sequence, which can dissipate the heat from the driving motor well, thereby reducing the temperature of the driving motor and ensuring the long-term normal operation of the driving motor and prolonging its service life.

The invention provides a microwave plasma adaptive rock breaking device for microwave-insensitive rocks and a using method thereof, and relates to the technical field of rock breaking. The microwave plasma adaptive rock breaking device comprises a microwave system, a microwave plasma conversion system and a cutter head system. The microwave system and the microwave plasma conversion system are mounted in the cutter head system, and the microwave system is connected with the microwave plasma conversion system. Under the premise that only a microwave source is used to supply energy, the combined action of ordinary microwave irradiation and plasma irradiation in the form of high-temperature flame is realized, and a full-section hard rock tunnel boring machine is in cooperation for breaking rocks, so that the problem of microwave-induced cracks of the microwave-insensitive rocks is solved, and the application scope of a microwave rock breaking technology is enlarged.

A horn antenna for emitting an electromagnetic HPEM microwave pulse along a central axis contains a microwave generator for the pulse having a waveguide along the central axis with a generator opening for the pulse, and a horn structure for shaping the pulse with an input opening and an emission opening for the pulse. The generator contains at least one HPEM source for the pulse. Each HPEM source contains at least two antennas for pulse components, disposed in succession in parallel with the central axis. The pulse is formed as a sum of the pulse components. A method for reconstructing a horn antenna to form the horn antenna with increased power, includes constructively increasing a number of antennas toward a respective HPEM source and orienting remaining antennas in a row relative to the first antenna, increasing the waveguide length, and keeping other dimensions of the horn antenna unchanged.

According to an embodiment of the present invention, there is disclosed an aerosol-generating device for generating an aerosol through microwaves, the device including a microwave heater generating microwaves; a microwave cavity located in the aerosol-generating device, configured to accommodate a cigarette containing an aerosol-generating substrate, and including at least one outlet for passing an aerosol generated from the cigarette heated by the generated microwaves; and a microwave antenna located outside the microwave cavity and configured to transmit the generated microwaves to a predetermined effective area range in the microwave cavity.