CN210840114U - Microwave heating antenna - Google Patents
Microwave heating antenna Download PDFInfo
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- CN210840114U CN210840114U CN201921267928.0U CN201921267928U CN210840114U CN 210840114 U CN210840114 U CN 210840114U CN 201921267928 U CN201921267928 U CN 201921267928U CN 210840114 U CN210840114 U CN 210840114U
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Abstract
The utility model discloses a microwave heating antenna, which comprises a microwave transmission line, a plurality of gaps and N frustum-shaped metal horns, wherein the gaps are positioned on the outer conductor wall of the microwave transmission line and distributed along the axis direction of the transmission line, and N is an integer more than or equal to 2; the gap communicates the inner space of the microwave transmission line with the outer space; the metal horn is formed by surrounding a metal thin wall into a frustum shape, the metal horn is provided with a larger outward opening surface and a smaller outward opening surface, the smaller outward opening surface is connected with the outer wall of the microwave transmission line, electric contact is achieved, a group of gaps corresponding to the electric contact are contained in the smaller outward opening surface, and microwave power radiated by the group of gaps can only enter an external space through the larger outward opening surface. In this way, the utility model discloses simple structure is compact, and the field distribution homogeneity is good, and the engineering is implemented conveniently, and is with low costs.
Description
Technical Field
The utility model relates to a microwave energy application technical field especially relates to a microwave heating antenna.
Background
Commonly used antennas in the field of high power microwave heating include two broad categories: one type is a slot antenna, namely according to the field distribution characteristics of a microwave transmission mode, a plurality of (generally at least 2) oblong slots are formed in the outer conductor wall of a transmission line, the inner space of the transmission line is communicated with the outside, and the slots cut currents on the conductor wall to generate space displacement currents, so that the radiation of the internal energy of the transmission line to the outer space is realized; the second type is a horn antenna, one of the mouth faces of the frustum-shaped horn (generally the larger one) is connected to the space to be acted upon, while the other (generally the smaller one) is connected to the microwave generator via an adapter structure and a microwave transmission line.
The slot antenna is generally applied to a long and narrow heating space with the axial size far larger than the cross section size, the axial direction of the microwave transmission line is consistent with the axial direction of the heating space, energy is distributed at different positions in the axial direction by utilizing the length of the slot antenna, and then the energy is radiated to a heated object.
The horn antenna is commonly used for a microwave applicator with a single or a plurality of energy feed ports, and for the single feed port, microwave energy generated by a microwave generator is directly transmitted to the horn antenna through a transmission line and an adaptive structure; for two or more horn antennas, a power distributor is also needed to distribute the energy generated by the microwave generator to different horns, the energy feedback mode is suitable for application with concentrated energy, if the energy feedback positions are more, a more complex power distribution and transmission system is needed, the complexity and the cost of the system are increased, and inconvenience is brought to use.
Based on the above drawbacks and disadvantages, it is necessary to improve the prior art and design a microwave heating antenna.
SUMMERY OF THE UTILITY MODEL
The utility model discloses the main technical problem who solves provides a microwave heating antenna, and simple structure is compact, restricts the coherent action between the gap when having longer distance's energy transmission and radiation characteristic, improves the inhomogeneity of gap antenna heating, and the field distribution homogeneity is good, and the engineering implementation is convenient, and is with low costs.
In order to solve the technical problem, the utility model discloses a technical scheme be: the microwave heating antenna comprises a microwave transmission line, a plurality of gaps and N frustum-shaped metal horns, wherein the gaps and the N frustum-shaped metal horns are positioned on the outer conductor wall of the microwave transmission line and distributed along the axial direction of the transmission line, and N is an integer greater than or equal to 2; one port of the microwave transmission line is an input port of the antenna, the other port of the microwave transmission line is packaged with a metal plate short circuit, the gap is in a strip shape and communicates the internal space of the microwave transmission line with the external space, the gap is divided into N groups, the number of the gaps in each group is equal or unequal, and each group of the gaps corresponds to one metal loudspeaker; the metal horn is formed by surrounding a metal thin wall into a frustum shape, the metal horn is provided with a larger outward opening surface and a smaller outward opening surface, the smaller outward opening surface is connected with the outer wall of the microwave transmission line, electric contact is achieved, a group of gaps corresponding to the electric contact are contained in the smaller outward opening surface, and microwave power radiated by the group of gaps can only enter an external space through the larger outward opening surface.
Preferably, the microwave transmission line adopts a rectangular waveguide, the microwave transmission line works in a TE10 mode, and the slot is located on the wide side of the rectangular waveguide (the smaller outward opening surface of the metal horn coincides with the wide side of the rectangular waveguide).
Preferably, the microwave transmission line adopts a rectangular waveguide, the microwave transmission line works in a TE10 mode, the slot is located at a narrow side of the rectangular waveguide, and a smaller outward opening surface of the metal horn coincides with the narrow side of the rectangular waveguide.
Preferably, the microwave transmission line is a coaxial transmission line, the slot is located on an outer conductor of the coaxial transmission line, and the long and narrow direction of the slot is perpendicular to or nearly perpendicular to the axial direction of the coaxial transmission line; the smaller outward opening surface of the metal horn is a partial cylindrical surface, the radius of the cylindrical surface is the same as the outer diameter of the coaxial transmission line outer conductor, and the smaller outward opening surface is tightly matched with the coaxial transmission line outer conductor to realize electric contact.
Preferably, this kind of microwave heating antenna still includes baffle and sealing strip, the baffle adopts insulating material, and the baffle covers on the surface of gap, prevent that dust, steam or other debris from getting into the waveguide inside, the baffle is close to the one side in gap and is equipped with square groove, and square inslot installs the sealing strip, further strengthens the protective capacities.
Preferably, the microwave heating antenna further comprises a tuning structure, wherein the tuning structure is a metal membrane, the tuning structure is positioned on the inner wall of the outer conductor of the microwave transmission line between two groups of gaps corresponding to the two metal horns, one end of the tuning structure is connected with the inner wall of the outer conductor, the other end of the tuning structure is inserted into the metal cylinder or the membrane inside the microwave transmission line, and the tuning structure is installed by adopting a single-side inner wall or installed by adopting two-side inner walls in pairs.
Compared with the prior art, the beneficial effects of the utility model are that: utilize the axial transmission ability of slot antenna to carry microwave power to longer effect space, recycle horn antenna's the effect of assembling, form certain isolation to the radiation that different groups of gaps produced, reduce the interference effect each other, improved the homogeneity of slot antenna space field distribution, also avoided using the required power distribution system of a plurality of horn antennas, simple structure, the engineering is implemented conveniently, and is with low costs.
Drawings
Fig. 1 is a schematic diagram of the microwave heating antenna of the present invention.
Fig. 2 is a schematic structural diagram of a first embodiment of the present invention.
Fig. 3 is a schematic partial structural diagram of a first embodiment of the present invention.
Fig. 4 is a schematic view of an application structure according to a first embodiment of the present invention.
Fig. 5 is a schematic diagram of simulation results of application field distribution according to the first embodiment of the present invention.
Fig. 6 is an input standing wave ratio diagram of an antenna according to a first embodiment of the present invention.
Fig. 7 is a schematic structural diagram of a second embodiment of the present invention.
Fig. 8 is a schematic structural diagram of a third embodiment of the present invention.
Detailed Description
The following detailed description of the preferred embodiments of the present invention will be provided to enable those skilled in the art to more easily understand the advantages and features of the present invention, and to make clear and definite definitions of the protection scope of the present invention.
Referring to fig. 1 to 8, an embodiment of the present invention includes:
the first embodiment is as follows:
a microwave heating antenna comprises a microwave transmission line 1, 15 gaps 2, five frustum-shaped metal horns 3, a baffle 6, a sealing strip 7 and a tuning structure 8, wherein the 15 gaps 2 are arranged on the outer conductor wall of the microwave transmission line 1 and distributed along the axial direction of the transmission line; the microwave transmission line 1 adopts a rectangular waveguide 4, the microwave transmission line 1 works in a TE10 mode, one port 11 of the microwave transmission line 1 is an input port of an antenna, the other port 12 of the microwave transmission line 1 is used for packaging a metal plate short circuit, the slot 2 is positioned on the wide side 41 of the rectangular waveguide, the slot 2 is in a rectangular strip shape, the long side of the slot 2 is perpendicular to the axial direction of the rectangular waveguide 4, the slot 2 is used for communicating the internal space and the external space of the rectangular waveguide 4, the slot 2 is divided into 5 groups, such as A1-A5 in the attached drawing 2, each group is provided with 3 slots, and each group of slots 2 corresponds to one metal horn 3; the metal horn 3 is enclosed into a frustum shape by a metal thin wall, the metal horn 3 is provided with a larger outward opening surface 31 and a smaller outward opening surface 32, the smaller outward opening surface 32 is overlapped and connected with the outer surface of the wide side 41 of the rectangular waveguide, electric contact is realized, and a group of gaps 2 corresponding to the small outward opening surface 32 are contained in the metal horn 3, so that the radiation power of the gaps 2 corresponding to each metal horn 3 is radiated to an action space completely through the larger outward opening surface 31 of the metal horn 3.
The baffle 6 covers on the surface of gap 2, and inside the baffle 6 shielded all gaps completely prevented that dust, steam or other debris from getting into rectangular waveguide 4, the one side of baffle 6 near gap 2 was equipped with square groove, and square inslot installs sealing strip 7, further strengthened protective capacities, baffle 6 adopts the little dielectric material of microwave loss, and preferred adoption polytetrafluoroethylene board.
The tuning structure 8 is a metal diaphragm, the tuning structure 8 is positioned on the inner wall of the outer conductor of the rectangular waveguide 4 between the two metal horns 3, one end of the tuning structure 8 is connected with the inner wall of the outer conductor, the other end of the tuning structure is inserted into the metal cylinder or the diaphragm inside the rectangular waveguide 4, and the tuning structure 8 is installed by adopting a single-side rectangular waveguide narrow edge 42 or two-side rectangular waveguide narrow edges 42 in pairs.
The microwave applicator of this embodiment is as shown in fig. 4, and metal loudspeaker 3's great external open face 31 is connected the top of cuboid cavity 9, from the top downwards shine material 10 in the cuboid cavity 9, cuboid cavity 9 size is 2.5m × 0.5m × 0.45.45 m, and material 10 thickness is 0.4mm, and the distance of the great external open face 31 of material 10 upper surface and metal loudspeaker 3 is 50 mm.
In the embodiment, a BJ9 rectangular waveguide is used as a transmission line 1, electromagnetic simulation optimization is performed at 915MHz to obtain 15 slots 2 with the length of 120mm and the width of 8mm, each 3 slots form a group, the distance between the two groups is 400mm, the height of a metal horn 3 is 200mm, the height of a tuning structure 8 extending into a cuboid cavity 9 is 28mm, when the dielectric constant of the material 10 is changed between 2.5 and 4.0 and the loss tangent is more than 0.05, the resulting field distribution is shown in fig. 5, with an antenna input reflection loss of less than-17 dB (corresponding to a voltage standing wave ratio of less than 1.33) within 915 ± 5MHz, as shown in fig. 6, this example performed a heating test on the granular material 10, after the auxiliary stirring measures are taken, the uniformity of the heating temperature of the material 10 is better than 4 ℃, and the structural size, the number of gaps and the grouping mode are only one of the optimized results of the embodiment and are not taken as the core technical characteristics of the embodiment.
The second embodiment is as follows:
in this embodiment, as shown in fig. 7, a microwave heating antenna is different from the first embodiment in that: the slot 2 is positioned on the narrow side 42 of the rectangular waveguide, the long side direction of the slot 2 is parallel to the axial direction of the rectangular waveguide 4, and the smaller outward opening surface 32 of the metal horn 3 is overlapped and connected with the outer surface of the narrow side 42 of the rectangular waveguide to form electric contact.
The third concrete embodiment:
in this embodiment, as shown in fig. 8, a microwave heating antenna is different from the first embodiment and the second embodiment in that: the microwave transmission line 1 adopts a coaxial transmission line 5, the coaxial transmission line 5 is composed of an outer conductor 51 and an inner conductor 52, a gap 2 is positioned on the outer conductor 51, the gap 2 communicates the space between the inner conductor 52 and the outer conductor 51 with the outer space, the gap 2 is rectangular strip-shaped, the long side of the gap 2 is vertical to the axial direction of the coaxial transmission line 5, the smaller outward opening surface 32 of the metal horn 3 is a part of a cylindrical surface, the radius of the cylindrical surface is the same as the outer diameter of the outer conductor 51, and the smaller outward opening surface 32 is superposed with the surface of the outer conductor 51 to form electric contact.
The utility model relates to a microwave heating antenna, simple structure is compact, restriction coherent action between the gap when having longer distance's energy transmission and radiation characteristic, improves the inhomogeneity of gap antenna heating, and the field distribution homogeneity is good, and the engineering implementation is convenient, and is with low costs.
The above only is the embodiment of the present invention, not limiting the patent scope of the present invention, all the equivalent structures or equivalent processes that are used in the specification and the attached drawings or directly or indirectly applied to other related technical fields are included in the patent protection scope of the present invention.
Claims (6)
1. A microwave heating antenna, characterized by: the microwave heating antenna comprises a microwave transmission line (1), a plurality of gaps (2) and N frustum-shaped metal horns (3), wherein the gaps (2) are arranged on the outer conductor wall of the microwave transmission line (1) and distributed along the axial direction of the transmission line, and N is an integer larger than or equal to 2; one port (11) of the microwave transmission line (1) is an input port of an antenna, the other port (12) of the microwave transmission line (1) is packaged with a metal plate short circuit, the gap (2) is in a strip shape, the gap (2) enables the inner space of the microwave transmission line (1) to be communicated with the outer space, the gap (2) is divided into N groups, the number of the gaps (2) in each group is equal or unequal, and each group of gaps (2) corresponds to one metal horn (3); the metal loudspeaker (3) is enclosed into the frustum shape by the metal thin wall, the metal loudspeaker (3) is provided with a larger external opening surface (31) and a smaller external opening surface (32), the smaller external opening surface (32) is connected with the outer wall of the microwave transmission line (1), an electric contact is realized, a group of gaps (2) corresponding to the electric contact are contained in the smaller external opening surface (32), and the microwave power radiated by the group of gaps (2) can only enter an external space through the larger external opening surface (31).
2. A microwave heating antenna according to claim 1, wherein: the microwave transmission line (1) adopts a rectangular waveguide (4), the microwave transmission line (1) works in a TE10 mode, the gap (2) is located on the rectangular waveguide wide side (41), and the smaller outward opening surface (32) of the metal horn (3) is overlapped with the rectangular waveguide wide side (41).
3. A microwave heating antenna according to claim 1, wherein: the microwave transmission line (1) adopts the rectangular waveguide (4), the microwave transmission line (1) works in a TE10 mode, the gap (2) is positioned on the narrow side (42) of the rectangular waveguide, and the smaller opening surface (32) of the metal horn (3) is superposed with the narrow side (42) of the rectangular waveguide.
4. A microwave heating antenna according to claim 1, wherein: the microwave transmission line (1) adopts a coaxial transmission line (5), the gap (2) is positioned on an outer conductor of the coaxial transmission line (5), and the long and narrow direction of the gap (2) is axially vertical or nearly vertical to the coaxial transmission line (5); the smaller outward opening surface (32) of the metal horn (3) is a partial cylindrical surface, the radius of the cylindrical surface is the same as the outer diameter of the outer conductor of the coaxial transmission line (5), and the smaller outward opening surface (32) is tightly matched with the outer conductor of the coaxial transmission line to realize electric contact.
5. A microwave heating antenna according to claim 1, 2, 3 or 4, wherein: still include baffle (6) and sealing strip (7), baffle (6) adopt insulating material, and baffle (6) cover on the surface of gap (2), prevent that dust, steam or other debris from getting into the waveguide inside, baffle (6) are close to the one side of gap (2) and are equipped with square groove, install sealing strip (7) in the square groove, further strengthen the protective capacities.
6. A microwave heating antenna according to claim 1, 2, 3 or 4, wherein: still include harmonious structure (8), harmonious structure (8) adopt the metal diaphragm, and harmonious structure (8) are located two that metal loudspeaker (3) correspond two sets of on microwave transmission line (1) outer conductor inner wall between gap (2), harmonious structure (8) one end and this outer conductor inner wall connection, the other end probes into inside metal cylinder or the diaphragm of microwave transmission line, harmonious structure (8) adopt unilateral inner wall installation or both sides inner wall to install in pairs.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921267928.0U CN210840114U (en) | 2019-08-07 | 2019-08-07 | Microwave heating antenna |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921267928.0U CN210840114U (en) | 2019-08-07 | 2019-08-07 | Microwave heating antenna |
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| CN210840114U true CN210840114U (en) | 2020-06-23 |
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| CN201921267928.0U Active CN210840114U (en) | 2019-08-07 | 2019-08-07 | Microwave heating antenna |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110381623A (en) * | 2019-08-07 | 2019-10-25 | 昆山九华电子设备厂 | A kind of microwave heating antenna |
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2019
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110381623A (en) * | 2019-08-07 | 2019-10-25 | 昆山九华电子设备厂 | A kind of microwave heating antenna |
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