CN102354795A - High-power microwave transmission antenna - Google Patents
High-power microwave transmission antenna Download PDFInfo
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- CN102354795A CN102354795A CN2011102204476A CN201110220447A CN102354795A CN 102354795 A CN102354795 A CN 102354795A CN 2011102204476 A CN2011102204476 A CN 2011102204476A CN 201110220447 A CN201110220447 A CN 201110220447A CN 102354795 A CN102354795 A CN 102354795A
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Abstract
The invention relates to a high-power microwave transmission antenna, which comprises a transmission antenna installation part and an impedance conversion part. The transmission antenna installation part is composed of an installation base plate and an installation base plate transition substrate; and the impedance conversion part consists of an input high-frequency joint, an antenna outer conductor, and an antenna inner conductor. And an operating wavelength of an input microwave signal of the antenna is lambda. Besides, the transmission antenna is characterized in that: a cavity structure is arranged in the antenna outer conductor; and the antenna inner conductor is installed coaxially in the cavity; diameters of the cavity inner wall of the antenna outer conductor become smaller gradually with an extending direction from the installation direction and the input high-frequency joint along a direction of a central axis. According to the invention, the transmission antenna can be directly applied to high power microwave transmission and the working band of the transmission antenna is wide; moreover, an ignition phenomenon on the condition of high power transmission is eliminated; the microwave loss is lowest in the microwave transmission antenna; and an output power of a microwave power source can be effectively transmitted to a furnace chamber.
Description
Technical field
The present invention relates to the microwave transmission antenna, particularly a kind of High-Power Microwave transmit antenna that is used for household microwave oven, industrial microwave apparatus.
Background technology
Magnetron is the radio tube that produces microwave, because oscillation efficiency is high, microwave output power is big, is widely used in household microwave oven and microwave processing equipments such as industry heating, chemical treatment.For the magnetron power output is input in the microwave oven cavity to greatest extent, adopt a kind of microwave transmission antenna of equivalent magnetron output block usually, through network analyzer, the impedance of adjustment furnace chamber makes it to mate with the magnetron impedance phase under low-power.This microwave transmission antenna is employed in a plurality of tuning screws of antenna outer conductor upper edge axial distribution usually; Through adjustment tuning screw distance radially; To realize the impedance adjustment of the coaxial line that the transmit antenna internal and external conductor forms, make between input impedance and the output impedance of transmit antenna and realize coupling.Because of tuning screw gos deep in the microwave transmission line, the microwave electric field of high frequency can be concentrated in the tuning screw end, forms high field intensity.So this microwave transmission antenna only is suitable for being applied in low-power as under watt level or the milliwatt level condition.More than being applied to several hectowatts to 1000 of microwave power that microwave oven usually uses watt during rank, sparking even punch-through appear easily.Simultaneously, this kind microwave transmission antenna, owing to have a plurality of tuning screws, and its microwave band narrow width that can work (be generally fo ± 5MHz, wherein fo is the input microwave frequency), internal loss is big, can not satisfy actual instructions for use.
Summary of the invention
The objective of the invention is to consider the problems referred to above; High-Power Microwave transmit antenna a kind of simple in structure, easy to make is provided, and this microwave transmission antenna does not re-use many screws and allocates; And can be operated in high power such as more than the 1000W; And working band is widened greatly, and internal loss reduces, and realizes that microwave power is transferred in the microwave oven cavity effectively.
The technical scheme that realizes the object of the invention is that a kind of High-Power Microwave transmit antenna includes transmit antenna installation portion and impedance conversion portion; Wherein the transmit antenna installation portion is formed with installation base plate transition pedestal by base plate is installed; Impedance conversion partly is made up of input high-frequency joint, antenna outer conductor, antenna inner wire, and the operation wavelength of the input microwave signal of antenna is λ, it is characterized in that; Antenna outer conductor inside is cavity structure; The antenna inner wire is installed in said cavity coaxially, antenna outer conductor inwall along central axial direction from installation portion to input high-frequency joint direction, its cavity inner wall is the structure that diameter progressively reduces.
Above-mentioned antenna outer conductor cavity inner wall is the cone structure that seamlessly transits that diameter reduces continuously, and said antenna inner wire is formed by cylindric thin bar with along the antenna inner wire match block cylindraceous that thin bar is installed coaxially.
The pyramidal angle that above-mentioned antenna outer conductor inwall seamlessly transits is 5～15o, the length L >=λ of antenna outer conductor/2, and the diameter of the thin bar of antenna inner wire is 3～6mm, the length of antenna inner wire match block is λ/4.
Above-mentioned antenna outer conductor cavity inner wall is stepped, and the internal diameter of ladder reduces step by step, simultaneously, and the stepped cylinder of antenna inner wire for reducing step by step with the corresponding diameter of the stepped cavity inner wall of antenna outer conductor.
Above-mentioned antenna outer conductor cavity inner wall ladder and antenna inner wire cylinder ladder progression are 3 grades, and wherein the length of each ladder is λ/4, and the scope of the spacing a between the corresponding cascaded surface of antenna inner wire and antenna outer conductor is 0～2mm.
The invention has the beneficial effects as follows; Owing to adopted between antenna inner wire and antenna outer conductor according to transition line principle in the coaxial transmission line; Use the continuous gradation mode from the high impedance of output antenna head to the Low ESR of importing high-frequency joint portion, the antenna outer conductor cooperates variation reaching the coupling purpose with inner wire, and microwave transmission antenna of the present invention has been cancelled traditional tuning structure of many screws; Therefore; Can directly apply to High-Power Microwave and transmit like microwave power more than 1000 watts, the working band width can reach fo ± 30MHz, and wherein fo is the input microwave frequency.Avoided the problem of under the high power transmission condition, striking sparks, and the lossy microwave in the microwave transmission antenna is minimum, can be effectively the power output of microwave power source be sent in the furnace chamber.The present invention is except that can be used for high power transmission, and also as the common tuning usefulness of coupling of the low power state of microwave oven and magnetron, it is simple in structure, does not receive the influence of problems such as tuning screw loosening.
Description of drawings
Fig. 1 is the structural representation of the embodiment of the invention one;
Fig. 2 is the assembling sketch map of inner and outer conductor among Fig. 1;
Fig. 3 is the structural representation of outer conductor among Fig. 1;
Fig. 4 is the structural representation of the embodiment of the invention two.
Embodiment
Below in conjunction with accompanying drawing and embodiment the present invention is further specified.
Embodiment one:
Like Fig. 1, Fig. 2, shown in Figure 3, the present invention includes transmit antenna installation portion and impedance conversion portion, wherein the transmit antenna installation portion is formed with installation base plate transition pedestal 6 by base plate 5 is installed; Impedance conversion partly is made up of input high-frequency joint 1, antenna outer conductor 2, antenna inner wire 3; The operation wavelength of the input microwave signal of antenna is λ, it is characterized in that, antenna outer conductor 2 inside are cavity structure; Cavity inner wall is the cone structure that seamlessly transits that diameter reduces continuously, and is as shown in Figure 3; Said antenna inner wire 3 is formed by cylindric thin bar 31 with along the antenna inner wire match block 32 cylindraceous that thin bar 31 is installed coaxially.The pyramidal angle that above-mentioned antenna outer conductor 2 inwalls seamlessly transit is 5 ~ 15o, the length L >=λ of antenna outer conductor 2/2, and the diameter of the thin bar 31 of antenna inner wire is 3～6mm, the length of antenna inner wire match block 32 is λ/4.
Above-mentioned input high-frequency joint 1 is connected to microwave signal source, and transmit antenna impedance conversion portion is the shank of this transmit antenna.2 of its antenna inner wire 3 and outer conductors are used continuous gradation mode from the high impedance of output antenna head 7 to the Low ESR of importing high-frequency joint portion 1 according to transition line principle in the coaxial transmission line, and antenna outer conductor 2 cooperates variation to reach the coupling purpose with inner wire 3.Its gradual change size of different working frequency is different, but antenna outer conductor 2 length L >=λ/2.Thin bar 31 of antenna inner wire and antenna inner wire match block 32 are the inner wires as coaxial transmission line.Principle according to transmission line middle impedance coupling; The impedance of transmission line at the different cross section place is divided into three parts, is respectively Z1, Z2; Z3; As shown in Figure 2, wherein
through matching with antenna outer conductor 2 transition lines, movable length is the antenna inner wire match block 32 of λ/4; Change its position at antenna outer conductor 2 axis directions; Thereby realize the impedance and the impedance phase coupling of exporting aerial head 7 places at input high-frequency joint 1 place of transmit antenna, can make in input standing-wave ratio S≤1.07 at input high-frequency joint 1 place, and working band can reach fo ± 30MHz; Simultaneously; Distance between the antenna internal and external conductor is enough big, realizes microwave transmission thereby can be implemented under the high-power condition, and phenomenons such as unlikely appearance sparking, puncture.
Embodiment two:
As shown in Figure 4; The difference of present embodiment and embodiment one is that said antenna outer conductor 2 cavity inner walls are stepped, and the internal diameter of ladder reduces step by step; Simultaneously, antenna inner wire 3 is the stepped cylinder that reduces step by step with the corresponding diameter of antenna outer conductor 2 stepped cavity inner walls.In the present embodiment; Antenna outer conductor 2 cavity inner wall ladders and antenna inner wire 3 cylinder ladder progression are 3 grades; Wherein the length of each ladder is λ/4, and the scope of the spacing a between the corresponding cascaded surface of antenna inner wire 3 and antenna outer conductor 2 is 0～2mm.
In the present embodiment, same with embodiment one, according to the principle of transmission line middle impedance coupling; The impedance of transmission line at the different cross section place is divided into three parts; Be respectively Z1, Z2, Z3; For making wherein
; Then every grade of step length of antenna outer conductor 2 and inner wire 3 is λ/4, change simultaneously between the cascaded surface of size and internal and external conductor of antenna internal and external conductor apart from a, can realize passing the impedance phase coupling at impedance and output aerial head 7 places at input high-frequency joint 1 place of transmit antenna; Can make input standing-wave ratio S≤1.07 at input high-frequency joint 1 place; And working band can reach fo ± 30MHz, and simultaneously, the distance between the antenna internal and external conductor is enough big; Thereby can be implemented under the high-power condition and realize microwave transmission, and phenomenons such as unlikely appearance sparking, puncture.
Claims (5)
1. High-Power Microwave transmit antenna; Include transmit antenna installation portion and impedance conversion portion, wherein the transmit antenna installation portion is by installing base plate (5) and base plate transition pedestal (6) being installed being formed, and impedance conversion portion is made up of input high-frequency joint (1), antenna outer conductor (2), antenna inner wire (3); The operation wavelength of the input microwave signal of antenna is λ; It is characterized in that antenna outer conductor (2) inside is cavity structure, inner wire (3) coaxially fixes up an aerial wire in said cavity; Antenna outer conductor (2) inwall along central axial direction from installation portion to input high-frequency joint (1) direction, its cavity inner wall is the structure that diameter progressively reduces.
2. High-Power Microwave transmit antenna according to claim 1; It is characterized in that; Said antenna outer conductor (2) cavity inner wall is the cone structure that seamlessly transits that diameter reduces continuously, and said antenna inner wire (3) is formed by cylindric thin bar (31) with along the thin coaxial mounted antenna inner wire match block cylindraceous of bar (31) (32).
3. High-Power Microwave transmit antenna according to claim 2; It is characterized in that; The pyramidal angle that said antenna outer conductor (2) inwall seamlessly transits is 5～15o; Length L >=λ/2 of antenna outer conductor (2), the diameter of the thin bar of antenna inner wire (31) is 3～6mm, the length of antenna inner wire match block (32) is λ/4.
4. High-Power Microwave transmit antenna according to claim 1; It is characterized in that; Said antenna outer conductor (2) cavity inner wall is stepped; And the internal diameter of ladder reduces step by step, and antenna inner wire (3) is the stepped cylinder that reduces step by step with the corresponding diameter of the stepped cavity inner wall of antenna outer conductor (2).
5. High-Power Microwave transmit antenna according to claim 4; It is characterized in that; Said antenna outer conductor (2) cavity inner wall ladder and antenna inner wire (3) cylinder ladder progression are 3 grades; Wherein the length of each ladder is λ/4, and the scope of the spacing a between the corresponding cascaded surface of antenna inner wire (3) and antenna outer conductor (2) is 0～2mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110220447.6A CN102354795B (en) | 2011-08-03 | 2011-08-03 | High-power microwave transmission antenna |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110220447.6A CN102354795B (en) | 2011-08-03 | 2011-08-03 | High-power microwave transmission antenna |
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| Publication Number | Publication Date |
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| CN102354795A true CN102354795A (en) | 2012-02-15 |
| CN102354795B CN102354795B (en) | 2014-06-11 |
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| CN201110220447.6A Active CN102354795B (en) | 2011-08-03 | 2011-08-03 | High-power microwave transmission antenna |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108365317A (en) * | 2018-05-16 | 2018-08-03 | 广东圣大电子有限公司 | A kind of ultra wide band multi-channel microwave power synthesizer |
| CN108550970A (en) * | 2018-06-20 | 2018-09-18 | 成都宝通天宇电子科技有限公司 | A kind of coaxial waveguide radial combiner |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0072729A1 (en) * | 1981-08-14 | 1983-02-23 | Alcatel Thomson Faisceaux Hertziens | Coaxial bandstop filter |
| JPH06252601A (en) * | 1993-02-26 | 1994-09-09 | Goro Sugawara | High frequency signal transmitter |
| CN2252413Y (en) * | 1996-01-23 | 1997-04-16 | 成都星海电子研究所 | Wide-band multimode feed |
| CN202205878U (en) * | 2011-08-03 | 2012-04-25 | 广东威特真空电子制造有限公司 | High-power microwave transmission antenna |
-
2011
- 2011-08-03 CN CN201110220447.6A patent/CN102354795B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0072729A1 (en) * | 1981-08-14 | 1983-02-23 | Alcatel Thomson Faisceaux Hertziens | Coaxial bandstop filter |
| JPH06252601A (en) * | 1993-02-26 | 1994-09-09 | Goro Sugawara | High frequency signal transmitter |
| CN2252413Y (en) * | 1996-01-23 | 1997-04-16 | 成都星海电子研究所 | Wide-band multimode feed |
| CN202205878U (en) * | 2011-08-03 | 2012-04-25 | 广东威特真空电子制造有限公司 | High-power microwave transmission antenna |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108365317A (en) * | 2018-05-16 | 2018-08-03 | 广东圣大电子有限公司 | A kind of ultra wide band multi-channel microwave power synthesizer |
| CN108365317B (en) * | 2018-05-16 | 2023-10-03 | 广东圣大电子有限公司 | Ultra-wideband multipath microwave power synthesizer |
| CN108550970A (en) * | 2018-06-20 | 2018-09-18 | 成都宝通天宇电子科技有限公司 | A kind of coaxial waveguide radial combiner |
| CN108550970B (en) * | 2018-06-20 | 2024-05-14 | 成都宝通天宇电子科技有限公司 | Coaxial waveguide radial power synthesizer |
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| CN102354795B (en) | 2014-06-11 |
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