A microwave irradiation apparatus includes: an annular microwave transmission path; a first microwave generation circuit that is coupled with the microwave transmission path and generates a first microwave; and a second microwave generation circuit that is coupled with the microwave transmission path and generates a second microwave; wherein the first microwave and the second microwave have frequencies equal to each other but have phases different from each other.

In a solid-state heating system, once a load with specific load characteristics has been placed in a heating cavity, a processing unit produces control signals that indicate an excitation signal frequency and one or more phase shifts, which constitute a combination of parameter values. Multiple microwave generation modules produce RF excitation signals characterized by the frequency and the phase shift(s). Multiple microwave energy radiators radiate, into the heating cavity, electromagnetic energy corresponding to RF excitation signals received from the microwave generation modules. Power detection circuitry takes reflected RF power measurements, and the processing unit determines a reflected power indication based on the measurements. The process is repeated for different combinations of the parameter values, and an acceptable combination of parameter values is determined and stored in a memory of the heating system. Acceptable combinations of parameter values similarly may be determined and stored for other loads with different load characteristics.

A semiconductor microwave oven and a semiconductor microwave source thereof. The semiconductor microwave oven includes: a body, a microwave input device, a semiconductor microwave source and a control device. The semiconductor microwave source includes a signal source, a power divider and N drive amplifiers. The signal source is configured to generate a first microwave signal. Power of the first microwave signal is allocated by the power divider to generate N second microwave signals. Each drive amplifier is configured to conduct drive amplification on the second microwave signal, and respectively to input same to the microwave input device to transmit into the chamber. The control device is configured to control the signal source to generate the first microwave signal. The microwave oven shares one signal source to guarantee operating at the same frequency, thereby realizing the highly efficient power output.

A heating device for an exhaust catalyst includes a first antenna and a second antenna. The heating device executes a specific radiation control for controlling operation of an electromagnetic wave generator to set a radiation state of an electromagnetic wave from the first antenna to be a different state from a radiation state of an electromagnetic wave from the second antenna. In such a case, the heating device acquires an intensity of an electromagnetic wave, of electromagnetic waves incident on the first antenna, and acquires an intensity of an electromagnetic wave, of electromagnetic waves incident on the second antenna. The heating device acquires a first temperature-correlated value for the first part based on the first electromagnetic wave intensity, and acquires a second temperature-correlated value for the second part based on the second electromagnetic wave intensity.

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 system for processing waste material is disclosed that includes at least one microwave generator, at least one microwave guide operatively connecting the at least one microwave generator to at least a first conveyor unit. The first conveyor unit is provided in a first housing that includes at least one opening configured to receive microwave energy via a first microwave guide and the first conveyor unit is configured to receive and process a quantity of waste material, which includes heating the waste material to a first temperature by applying microwave energy to the waste material within the first housing.

A method of heating a load in a cavity of an apparatus for heating objects by transmitting to the cavity electromagnetic waves may include determining, for each of a plurality of modulation space elements (MSEs), a dissipation ratio indicating a proportion of power dissipated in the load to power transmitted into the cavity, wherein each MSE is a set of one or more values of variables, each controllable by the apparatus, that affect a field pattern excited in the cavity. The method may further include selecting one or more MSEs from the plurality of MSEs based on the dissipation ratio determined for each of the plurality of MSEs, wherein each of the selected one or more MSSEs is associated with a corresponding dissipation ratio that is lower than a threshold and applying RF energy to the load at the selected one or more frequencies.

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.

High frequency heating device is provided with heater disposed adjacent to mount base on which object to be heated is mounted and having a plurality of surface wave transmission lines electrically isolated from each other, and first and second high frequency power generators, each of which generates high frequency power having different frequency. Surface wave transmission lines receive at least one of the high frequency power generated by first high frequency power generator and the high frequency power generated by second high frequency power generator. According to this aspect, interference between the high frequency powers is not occurred and electromagnetic field coupling is not occurred. As a result, in the high frequency heating device provided with the surface wave transmission line using a periodic structure, uneven baking caused by the electromagnetic field coupling can be suppressed, and a heating state of an object to be heated can be easily controlled.

An electromagnetic heater for heating an irregularly shaped object, including: a cavity within which an object is to be placed; at least one feed which feeds UHF or microwave energy into the cavity; and a controller that controls one or more characteristics of the cavity or energy to assure that the UHF or microwave energy is deposited uniformly in the object within 30% over at least 80% of the volume of the object.