Description:TECHNICAL FIELD
[0001] The present disclosure relates generally to the technical field of microwave devices. In particular, it pertains to an improved microwave device which provide fast and smooth thermal flow from inside of the device to surrounding without any electromagnetic (EM) leakage.

BACKGROUND
[0002] Background description includes information that may be useful in understanding the present invention. It is not an admission that any of the information provided herein is prior art or relevant to the presently claimed invention, or that any publication specifically or implicitly referenced is prior art.
[0003] A "microwave device" typically refers to any device that generates or utilizes microwaves. Microwaves are a form of electromagnetic radiation with wavelengths ranging from about one meter to one millimeter, corresponding to frequencies between 300 MHz (0.3 GHz) and 300 GHz. The microwave devices for high power application can suffer with serious heating issues. Heat management issue is the major concern in high power microwave devices. A high power microwave source (power in Kilowatt to few mega Watt) is required in a chemical vapour deposition (CVD) chamber, a food sterilization and preservation.
[0004] In real-time applications, the microwaves while propagating from a source to a destination may suffer with several losses in a form of a heat energy, converted out from a microwave energy. The losses in the form of the heat energy can appear with rise in a temperature of the microwave device non-linearly. The rise in the temperature may affect the wave propagation, thereby impact performance of the microwave device.
[0005] To control and stabilize the temperature inside the microwave device, cooling system would be required. Traditionally, water and air circulatory systems are designed to control the temperature, however these systems are expensive and makes the microwave device dependent that would be shut down due to any fault in the cooling system.
[0006] In view thereof, there is a need in the art to overcome the aforementioned issues associated with the existing microwave devices by providing an improved microwave device which provide fast and smooth thermal flow from inside of the device to surrounding without any electromagnetic (EM) leakage.
[0007]

OBJECTS OF THE PRESENT DISCLOSURE
[0008] An object of the present disclosure relates, in general, to the field of microwave devices, and more specifically, relates to an improved microwave device which provide fast and smooth thermal flow from inside of the device to surrounding without any electromagnetic (EM) leakage.
[0009] Another object of the present disclosure is to provide an improved microwave device that can enable smooth thermal flow from inside of the device to surrounding without changing mode of microwave propagation.
[0010] Another object of the present disclosure is to provide a simple cooling means in the proposed microwave device for heat management.
[0011] Another object of the present disclosure is to provide a microwave device that can be non-expensive.
[0012] Another object of the present disclosure is to provide a microwave device that can have a plurality of slots or holes disposed in walls of the launcher that can dissipate heat through convection process.
[0013]

SUMMARY
[0014] The present disclosure relates, in general, to microwave devices, and more specifically, relates to an improved microwave device which provide fast and smooth thermal flow from inside of the device to surrounding without any electromagnetic (EM) leakage.
[0015] According to an aspect, the present disclosure relates to an improved microwave device. The microwave device comprises a microwave applicator cavity to facilitate exposure of a target object to microwave energy. The microwave device comprises a microwave source coupled to the microwave applicator cavity. The microwave source is configured to generate the microwave energy to be exposed over the target object. Further, the microwave device comprises a launcher that is coupling the microwave source with the microwave applicator cavity. The launcher is configured to transmit the microwave energy radiated from the microwave source to the microwave applicator cavity in form of microwaves.
[0016] In addition, the launcher comprises a cooling means configured to facilitate thermal flow from inside of the launcher to an outside environment without electromagnetic (EM) leakage from the microwaves.
[0017] In an aspect, the launcher may comprise a mounting hole configured at a top surface. The mounting hole may enable coupling of the launcher with the microwave source.
[0018] In an aspect, the cooling means may be disposed on at least one of a first side surface, and a second side surface of the launcher. The cooling means may dissipate heat losses through a convection process.
[0019] In an aspect, the cooling means may comprise a plurality of slots. The plurality of slots may have a pitch (p) defining a distance between central axes of two adjacent slots, and a width (w), when the slot may be a rectangular slot.
[0020] In an aspect, each slot of the plurality of slots may extend in a plane substantially orthogonal to a longitudinal axis of the launcher.
[0021] In an aspect, a ratio of the pitch (p) and the width (w) of the rectangular slot may be kept less than two.
[0022] In an aspect, the plurality of slots may be circular slots. The circular slot may have a diameter (d) equal to the width (w) of the rectangular slot, such that the ratio of the pitch to the diameter of the circular slot is kept less than two.
[0023]
[0024] In an aspect, the plurality of slots may be circular slots. The circular slot may have a diameter (d) equal to the width (w) of the rectangular slot, such that the ratio of the pitch to the diameter of the circular slot is kept less than two.
[0025] In another embodiment, the cooling means may comprise a plurality of holes disposed on at least one of a first side surface, and a second side surface of the launcher. The plurality of holes may dissipate heat losses through the convection process.
[0026] In an aspect, the microwave source may be a magnetron.
[0027] In an aspect, the magnetron may comprise a cathode probe in a centre of the microwave source placed in a dome-shaped structure, and an anode body surrounding the cathode probe.
[0028] Various objects, features, aspects, and advantages of the inventive subject matter will become more apparent from the following detailed description of preferred embodiments, along with the accompanying drawing figures in which like numerals represent like components.

BRIEF DESCRIPTION OF THE DRAWINGS
[0029] The following drawings form part of the present specification and are included to further illustrate aspects of the present disclosure. The disclosure may be better understood by reference to the drawings in combination with the detailed description of the specific embodiments presented herein.
[0030] FIGs. 1A-1B illustrate (i) an exemplary front view and (ii) an exemplary cross-sectional side view of an existing microwave device with fluid circulatory systems for heat management inside the microwave device.
[0031] FIGs. 2A-2B illustrate (i) an exemplary front view and (ii) an exemplary cross-sectional side view of a proposed microwave device having a plurality of slots for heat management inside the microwave device, in accordance with an embodiment of the present disclosure.
[0032] FIGs. 3A-3B illustrate (i) an exemplary front view and (ii) an exemplary cross-sectional side view of a proposed microwave device having a plurality of holes for heat management inside the microwave device, in accordance with another embodiment of the present disclosure.
[0033] FIGs. 4A-4B illustrate (i) a graph showing insertion losses, and (ii) a graph showing transmission losses of the proposed microwave device in comparison to the existing microwave device, in accordance with an exemplary embodiment of the present disclosure.
DETAILED DESCRIPTION
[0034] The following is a detailed description of embodiments of the disclosure depicted in the accompanying drawings. The embodiments are in such detail as to clearly communicate the disclosure. If the specification states a component or feature “may”, “can”, “could”, or “might” be included or have a characteristic, that particular component or feature is not required to be included or have the characteristic.
[0035] As used in the description herein and throughout the claims that follow, the meaning of “a,” “an,” and “the” includes plural reference unless the context clearly dictates otherwise. Also, as used in the description herein, the meaning of “in” includes “in” and “on” unless the context clearly dictates otherwise.
[0036] The present disclosure relates, in general, to microwave devices, and more specifically, relates to an improved microwave device which provide fast and smooth thermal flow from inside of the device to surrounding without any electromagnetic (EM) leakage.
[0037] The present disclosure relates to an improved microwave device. The microwave device includes a microwave applicator cavity to facilitate exposure of a target object to microwave energy. The microwave device includes a microwave source coupled to the microwave applicator cavity. The microwave source is configured to generate the microwave energy to be exposed over the target object. Further, the microwave device includes a launcher that is coupling the microwave source with the microwave applicator cavity. The launcher is configured to transmit the microwave energy radiated from the microwave source to the microwave applicator cavity in form of microwaves.
[0038] In addition, the launcher includes a cooling means configured to facilitate thermal flow from inside of the launcher to an outside environment without electromagnetic (EM) leakage from the microwaves.
[0039] In an embodiment, the cooling means can be disposed on at least one of a first side surface, and a second side surface of the launcher. The cooling means can dissipate heat losses through a convection process.
[0040] In an embodiment, the cooling means can include a plurality of slots. The plurality of slots can have a pitch (p) defining a distance between central axes of two adjacent slots, and a width (w), when the slot can be a rectangular slot.
[0041] In an embodiment, each slot of the plurality of slots can extend in a plane substantially orthogonal to a longitudinal axis of the launcher.
[0042] In an embodiment, a ratio of the pitch (p) and the width (w) of the rectangular slot can be kept less than two.
[0043] The present disclosure can be described in enabling detail in the following examples, which may represent more than one embodiment of the present disclosure.
[0044] FIGs. 1A-1B illustrate (i) an exemplary front view 100A and (ii) an exemplary cross-sectional side view 100B of an existing microwave device 100 with fluid circulatory systems for heat management inside the microwave device.
[0045] Referring to FIGs. 1A-1B, an existing microwave device 100 can include a water and air circulatory system for heat management inside the microwave device. The microwave device 100 can include, but not limited to a microwave oven, a radar, the CVD chamber, a food sterilization ad preservation devices, and the like. The microwave device 100 include a microwave source 104 and a launcher 106. A plurality of channels 108 (shown in FIG. 1B) are configured along each surface of the launcher 106 to facilitate flow of coolant fluid. The coolant fluid can include but not limited to water, dielectric fluid, ethylene glycol, and the like. Further, the surface of the launcher can include a circular slot 114 configured for air circulation. However, the heat management by implementing the plurality of channels 108 and the circular slot 114 (as shown in FIG. 1A) can lead to electromagnetic (EM) leakage in the microwave device 100, thereby impacting performance of the microwave device 100.
[0046] FIGs. 2A-2B illustrate (i) an exemplary front view 200A and (ii) an exemplary cross-sectional side view 200B of a proposed microwave device 200 having a plurality of slots for heat management inside the microwave device, in accordance with an embodiment of the present disclosure.
[0047] Referring to FIG. 2A-2B, in an embodiment, the proposed microwave device 200 includes a microwave applicator cavity 102 to facilitate exposure of a target object to microwave energy. The microwave device 200 includes a microwave source 104 coupled to the microwave applicator cavity 102. The microwave device 200 can include, but not limited to the microwave oven, the radar, the CVD chamber, the food sterilization ad preservation devices, and the like. The microwave source 104 is configured to generate the microwave energy to be exposed over the target object. The microwave source 104 can include a magnetron, a semiconductor transistor, diodes and the like, without limitations. In an embodiment, the microwave source 104 can be a magnetron 104. The magnetron 104 includes a cathode probe 110, an anode body 112 surrounding the cathode probe 110. The cathode probe 110 (also referred as a filament 110) can be placed in a dome-shaped structure of the magnetron 104. Further, magnets are placed around the magnetron 104 to provide a force to excite electrons to move in a loop.
[0048] The filament 110 of the magnetron 104 can be connected to a negative pole of a high-tension direct current (DC) supply and the anode body 112 can be connect to a positive pole of the high-tension direct current (DC) supply. The electrons can be accelerated by an electric field towards the anode body 112. However, due to orientation of a magnetic field orthogonal to path of the accelerated electrons, the electrons can be forced to follow a spiral path leading from the filament 110 to the anode body 112.
[0049] In an embodiment, the anode body 112 can include a plurality of cavity extending radially from a centre of the anode body 112. The accelerated electrons passes by the magnetron, and converts a portion of a kinetic energy of the accelerated electrons into microwave energy.
[0050] Further, the microwave device 200 includes a launcher 106 that can couple the microwave source 104 with the microwave applicator cavity 102. The launcher 106 is configured to transmit the microwave energy radiated from the microwave source 104 to the microwave applicator cavity 102 in form of microwaves. In some embodiments, the launcher 106 can be used in integrated with wave guides. In some embodiments, the launcher 106 can be directly attached to the microwave applicator cavity 102, depends on application of the microwave device 200. The launcher 106 can be selected from but not limited to a straight-rectangular launcher, a tapered launcher, and the like. The launcher 106 can include a mounting flange at one end. The mounting flange can facilitate screwing of the launcher 106 with the microwave applicator cavity 102, including but not limited to cavity of a heating chamber, the CVD chamber, a plasma heating chamber, a micro oven cavity, and the like.
[0051] In addition, the proposed microwave device 200 may implement the cooling means 202, 204 along with the plurality of cavity 108 and the circular slot 114 of the existing microwave device 100 for better performance and result.
[0052] In one or more embodiments, the launcher 106 can be made of material selected from, without limitations, an aircraft grade aluminium, a stainless steel, an oxygen- free copper (OFC), and the like material having properties such as but not limited to long magnetic and electric integrity, heat-proof, high thermal conductivity, and more durability.
[0053] The launcher 106 can include a mounting hole 116 configured at a top surface, the mounting hole 116 enables coupling of the launcher 106 with the microwave source 104. In some embodiments, the mounting hole 116 can be provided at any of side surfaces of the launcher 106.
[0054] In an embodiment, the launcher 106 includes a cooling means 202, 204 configured to facilitate thermal flow from inside of the launcher 106 to an outside environment without electromagnetic (EM) leakage from the microwaves. The cooling means 202, 204 can include a plurality of slots 202 as shown in FIG. 2B. The plurality of slots 202 have a pitch (p) defining a distance between central axes of two adjacent slots, and a width (w), when the slot is a rectangular slot. Each slot 202 of the plurality of slots 202 extends in a plane substantially orthogonal to a longitudinal axis of the launcher 106. Further, a ratio of the pitch (p) and the width (w) of the rectangular slot is kept less than two. Maintaining the ratio p/w as 2 helps in thermally linking the microwave device 200 with the surrounding and electromagnetically disconnecting the microwave device 200 with the surrounding.
[0055] FIGs. 3A-3B illustrate (i) an exemplary front view and (ii) an exemplary cross-sectional side view of a proposed microwave device having a plurality of holes for heat management inside the microwave device, in accordance with another embodiment of the present disclosure.
[0056] Referring to FIG. 3A-3B and in another embodiment, the cooling means 202, 204 of the proposed microwave device 200 can include a plurality of holes 204 (shown in FIG. 3B) disposed on at least one of the first side surface and the second side surface of the launcher 106. The plurality of holes 204 can be of shape selected from but not limited to a circular, a square, a rectangular, and the like.
[0057] Further, in another embodiment, a distance between centres of the adjacent holes 204 can be considered as the pitch. The hole 204 can have a diameter having value d. Thus, for maintaining thermal linkage of the microwave device 200 with the surrounding and electromagnetically insulation of the microwave device 200 with the surrounding, the ratio p/d should be kept below two (2).
[0058] FIGs. 4A-4B illustrate (i) a graph showing insertion losses, and (ii) a graph showing transmission losses of the proposed microwave device in comparison to the existing microwave device, in accordance with an exemplary embodiment of the present disclosure.
[0059] Referring to FIGs. 4A-4B, graphs show that the loss reflection and transmission losses are less in case of slotted 202 /hole 204 integrated with the launcher 106 in operation band from 2.4GHz to 2.5GHz. This signifies that the heat dissipation is less in case of modified launcher 106 structures. So external heat management is not required up to few Kilo Watt in modified structures. Whereas the conventional launcher depends on external cooling arrangement to maintain temperature like chilled water circulation, exhaust fan, bulky fin structures integration, and the like.
[0060] Thus, the person skilled in the art would appreciate that the proposed microwave device 200 with provide fast and smooth thermal flow from inside of the device to surrounding without any electromagnetic (EM) leakage. The proposed device can be easily handle, compact, non-expensive and independently work, thereby increasing the potential applications of this precise and powerful technique.
[0061] Thus, in implementation, the plurality of slots or holes insertion in the wave guide and/ or launcher side walls can be used in various wave guide-based devices such as but not limited tomicro oven, the CVD chamber, electron magnetic wave guns, the food sterilization ad preservation devices, the radar and the like, to improve thermal convection rates in case of high power operation. Further, the slotted wave guide wall can also be integrated with modified fin line to enhance thermal convection much more.
[0062] The configuration illustrated in the aforementioned embodiment merely illustrates an example of the content of the present invention, and can thus be combined with another known technique or partially omitted and/or modified without departing from the scope of the present invention.
[0063] It will be apparent to those skilled in the art that the apparatus of the disclosure may be provided using some or all of the mentioned features and components without departing from the scope of the present disclosure. While various embodiment of the present disclosure have been illustrated and described herein, it will be clear that the disclosure is not limited to these embodiment only. Numerous modifications, changes, variations, substitutions, and equivalents will be apparent to those skilled in the art, without departing from the scope of the disclosure, as described in the claims.

ADVANTAGES OF THE PRESENT DISCLOSURE
[0064] The present invention provides an improved microwave device which provide fast and smooth thermal flow from inside of the device to surrounding without any electromagnetic (EM) leakage.
[0065] The present invention provides an improved microwave device that enables smooth thermal flow from inside of the device to surrounding without changing mode of microwave propagation.
[0066] The present invention provides a simple cooling means in the proposed microwave device for heat management.
[0067] The present invention provides a microwave device that is non-expensive.
[0068] The present invention provides a microwave device that can have a plurality of slots or holes disposed in walls of the launcher that dissipate heat through convection process.
[0069] The present invention can be externally integrated with a heat absorbing system or material to manage greater heat flow in the case of high power radio frequency (RF) equipment.

, Claims:1. An improved microwave device (200) comprising:
a microwave applicator cavity (102) to facilitate exposure of a target object to microwave energy;
a microwave source (104) coupled to the microwave applicator cavity (102), the microwave source (104) is configured to generate the microwave energy to be exposed over the target object; and
a launcher (106) coupling the microwave source (104) with the microwave applicator cavity (102), the launcher (106) is configured to transmit the microwave energy radiated from the microwave source (104) to the microwave applicator cavity (102) in form of microwaves,
wherein the launcher (106) comprises a cooling means (202, 204) configured to facilitate thermal flow from inside of the launcher (106) to an outside environment without electromagnetic (EM) leakage from the microwaves.
2. The microwave device (200) as claimed in claim 1, wherein the launcher (106) comprises a mounting hole (116) configured at a top surface, the mounting hole (116) enables coupling of the launcher (106) with the microwave source (104).
3. The microwave device (200) as claimed in claim 1, wherein the cooling means (202, 204) are disposed on any at least one of a first side surface, and a second side surface of the launcher (106), to dissipate heat losses through a convection process.
4. The microwave device (200) as claimed in claim 2, wherein the cooling means (202, 204) comprise a plurality of slots (202), wherein the plurality of slots (202) have a pitch (p) defining a distance between central axes of two adjacent slots (202), and a width (w), when the slot (202) is a rectangular slot.
5. The microwave device (200) as claimed in claim 4, wherein each slot (202) of the plurality of slots (202) extends in a plane substantially orthogonal to a longitudinal axis of the launcher (106).
6. The microwave device (100) as claimed in claim 4, wherein a ratio of the pitch (p) and the width (w) of the rectangular slot is kept less than two (2).
7. The microwave device (100) as claimed in claim 4, wherein the plurality of slots (202) are circular slots, wherein the circular slot (202) has a diameter (d) equal to the width (w) of the rectangular slot, such that the ratio of the pitch (p) to the diameter (d) of the circular slot (202) is kept less than two.
8. The microwave device (100) as claimed in claim 3, wherein the cooling means (202, 204) comprise a plurality of holes (204) disposed on at least one of a first side surface, and a second side surface of the launcher (106), to dissipate heat losses through the convection process.
9. The microwave device (200) as claimed in claim 1, wherein the microwave source (104) is a magnetron (104).
10. The microwave device (200) as claimed in claim 9, wherein the magnetron (104) comprises a cathode probe (110) in a centre of the magnetron (104) placed in a dome-shaped structure (112); and an anode body (114) surrounding the cathode probe (110).