WO2021000888A1 - 一种多微波源加热系统 - Google Patents

一种多微波源加热系统 Download PDF

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Publication number
WO2021000888A1
WO2021000888A1 PCT/CN2020/099705 CN2020099705W WO2021000888A1 WO 2021000888 A1 WO2021000888 A1 WO 2021000888A1 CN 2020099705 W CN2020099705 W CN 2020099705W WO 2021000888 A1 WO2021000888 A1 WO 2021000888A1
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microwave
heating system
antenna
radio frequency
solid
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PCT/CN2020/099705
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English (en)
French (fr)
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彭高
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深圳市博威射频科技有限公司
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Publication of WO2021000888A1 publication Critical patent/WO2021000888A1/zh

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    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B6/00—Heating by electric, magnetic or electromagnetic fields
    • H05B6/64—Heating using microwaves
    • H05B6/66—Circuits
    • H05B6/68—Circuits for monitoring or control
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B6/00—Heating by electric, magnetic or electromagnetic fields
    • H05B6/64—Heating using microwaves
    • H05B6/72—Radiators or antennas
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B6/00—Heating by electric, magnetic or electromagnetic fields
    • H05B6/64—Heating using microwaves
    • H05B6/76—Prevention of microwave leakage, e.g. door sealings

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  • the invention relates to the field of microwave heating, in particular to a heating system with multiple microwave sources.
  • the purpose of the present invention is to provide a multi-microwave source heating system, which aims to solve the problem of making a dual-source heating system composed of a 900MHz microwave feed and a 2.45GHz magnetron in the size of a household microwave oven to improve heating efficiency And food uniformity.
  • the present invention provides the following solutions:
  • a heating system with multiple microwave sources includes a microwave oven cavity and a furnace door.
  • the microwave oven cavity is provided with a solid-state source and a magnetron.
  • the solid-state source is connected to an electronically modulated radio frequency coaxial antenna, and the magnetron is connected to the microwave
  • the waveguide exciter is connected, and the solid-state source and the magnetron are used as a microwave source for common heating.
  • the electrically-tuned radio frequency coaxial antenna includes an antenna body, a radio frequency coaxial connector, a limit shaft clip, and an antenna dish, and the antenna dish is arranged in the cavity of the microwave oven.
  • a controller is provided on the side of the ESC radio frequency coaxial antenna, and the relative position of the antenna body and the microwave oven cavity is controlled by the controller.
  • the controller includes an MCU controller, a driving device, and a transmission device.
  • the driving device is controlled by the MCU controller, and the transmission device drives the antenna body in the The cavity of the microwave oven moves to adjust the relative position of the antenna body and the cavity of the microwave oven.
  • the solid-state source is arranged at the top of the cavity of the microwave oven, and is connected to the ESC radio frequency coaxial antenna through a radio frequency transmission cable.
  • the magnetron is arranged on the side or behind the cavity of the microwave oven, and is connected to the microwave waveguide exciter via a microwave waveguide transmission line.
  • the furnace door is provided with a multilayer shielding layer, and the radio frequency signal is shielded by the multilayer shielding layer.
  • the magnetron is provided with one or more groups.
  • the output power of the solid-state source power amplifier is 300W-800W.
  • the output frequency of the solid-state source power amplifier is 902 MHz-928 MHz.
  • the present invention discloses the following technical effects:
  • the present invention discloses a multi-microwave source heating system, which includes a microwave oven cavity and a furnace door.
  • the microwave oven cavity is provided with a solid-state source and a magnetron.
  • the solid-state source is connected with an electronically modulated radio frequency coaxial antenna.
  • the magnetron is connected to the microwave waveguide exciter, and the solid-state source and the magnetron are used as microwave sources for common heating.
  • the multi-microwave source heating system of the present invention can realize the common heating of multiple microwave sources and improve the microwave heating efficiency.
  • Figure 1 is a schematic diagram of the structure of a multi-microwave source heating system of the present invention
  • Fig. 2 is a partial enlarged schematic diagram of the ESC radio frequency coaxial antenna of the present invention.
  • Microwave solid-state sources uses solid-state active devices to generate microwave signals.
  • the solid-state devices used are generally LDMOS (laterally diffused metal oxide semiconductor) and GaN (gallium nitride semiconductor).
  • Magnetron is an electric vacuum device used to generate microwave energy. It is essentially a diode placed in a constant magnetic field. The electrons in the tube interact with the high-frequency electromagnetic field under the control of a mutually perpendicular constant magnetic field and a constant electric field, and convert the energy obtained from the constant electric field into microwave energy, thereby achieving the purpose of generating microwave energy.
  • the present invention proposes a way of using multiple microwave sources for microwave heating.
  • the multiple microwave source heating system uses microwave sources in multiple ways to cooperate to perform microwave heating, thereby improving heating efficiency.
  • Figure 1 is a schematic structural diagram of the multi-microwave source heating system of the present invention.
  • the present invention discloses a multi-microwave source heating system, where the system includes a microwave oven cavity 101 and a furnace door 102.
  • the microwave oven cavity 101 is provided with a solid-state source 103 and a magnetron 104.
  • the solid-state source 103 is connected to an electronically modulated radio frequency coaxial antenna 105.
  • the magnetron 104 is connected to a microwave waveguide exciter 106 through the solid state
  • the source 103 and the magnetron 104 serve as a microwave source for heating together.
  • FIG. 2 is a specific embodiment of the present invention
  • FIG. 2 is a partial enlarged schematic diagram of the electrically modulated radio frequency coaxial antenna of the present invention.
  • the ESC radio frequency coaxial antenna 105 includes an antenna body 501, a radio frequency coaxial connector 502, a limiting shaft card 503, and an antenna plate 504, wherein the radio frequency coaxial connector 502, the limiting shaft card 503 and the antenna dish 504 are arranged in order from top to bottom, and the antenna dish 504 is arranged in the microwave oven cavity 101, and the antenna body 501 is located on the radio frequency coaxial connector 502 and the antenna dish 504 between.
  • the multi-microwave source heating system further includes a controller (the positional relationship of the controller is not shown in FIG. 1), wherein the controller is arranged on the side of the ESC radio frequency coaxial antenna 105, and the controller uses To control the relative position of the antenna body and the microwave oven cavity 101.
  • the controller includes an MCU controller, a driving device, and a transmission device.
  • the driving device is controlled by the MCU controller, and the transmission device drives the antenna body in the microwave oven cavity through the driving of the driving device.
  • the transmission device includes an eccentric wheel and a connecting rod.
  • the drive device drives the eccentric wheel to rotate, and drives the radio frequency coaxial connector of the radio frequency antenna, thereby driving the antenna body and the antenna plate to move up and down in the microwave oven cavity.
  • the eccentric wheel includes two groups, one group of eccentric wheel is connected with the driving device, and the other group of eccentric wheel is connected by a connecting rod, and the other group of eccentric wheel is connected with the radio frequency coaxial connector.
  • the transmission device belongs to a reciprocating link structure. Due to the special structure of the eccentric wheel, the driving device drives one group of eccentric wheels to rotate, and the connecting rod drives the second group of eccentric wheels to rotate, thereby realizing reciprocating motion.
  • the reciprocating link structure determines the highest and lowest points of the antenna stroke, and the antenna always reciprocates within the stroke, which ensures the safe and reliable operation of the entire high-power radio frequency link.
  • the microwave frequency is transmitted through the electrically modulated radio frequency coaxial antenna 105 to realize the feeding of radio frequency microwave signals.
  • the solid-state source 103 is arranged on the top of the microwave oven cavity 101 and is connected to the ESC radio frequency coaxial antenna 105 through a radio frequency transmission cable 107.
  • the radio frequency transmission cable 107 is preferably a radio frequency coaxial cable, which can ensure shielding efficiency and avoid the loss of microwave energy.
  • the insulating material of the radio frequency transmission cable 107 is made of physical foamed polyethylene to isolate the copper wire conductor, and the outside of the insulating material is another layer of ring conductor, which is called the outer conductor or the tissue shielding layer, and the outer conductor is formed by copper tape and welded. Or tying process; or adopting aluminum tube structure; or adopting woven structure, the entire cable is covered by a PVC sheath.
  • the magnetron 104 is arranged on the side or the back of the microwave oven cavity 101, and is connected to the microwave waveguide exciter 106 through a microwave waveguide transmission line 108.
  • the existing known microwave waveguide exciter 106 includes a waveguide box, a coaxial connector, and an antenna rod.
  • the waveguide box has a cavity inside. Along the length of the waveguide box, one end of the cavity is open and the other is open.
  • the coaxial connector is located in the cavity and the upper end passes through the top wall of the waveguide box;
  • the antenna rod is provided in the cavity and communicates with the coaxial connector, the The number of antenna rods is at least one, and the antenna rod extends in a plane perpendicular to the axis of the coaxial connector.
  • the oven door 102 is provided with a multi-layer shielding layer, and the radio frequency signal is shielded by the multi-layer shielding layer to ensure shielding efficiency and reduce microwave energy loss.
  • the number of magnetrons 104 can be selected according to needs. According to different heating requirements, one or more magnetrons 104 can be selected to realize one or more magnetrons.
  • the tube 104 is heated by the microwave source.
  • the output power of the solid-state source 103 power amplifier is 300W-800W, and the output frequency of the solid-state source 103 power amplifier is 902MHz-928MHz.
  • the above design can meet the heating requirements of a miniaturized microwave oven.
  • the invention adopts a 900MHz solid source and a 2.45GHz magnetron as a microwave source to heat together, solves the shortcomings of insufficient heating depth of the traditional 2.45GHz magnetron microwave oven, and improves the uniformity of food heating.
  • the best matching cavity size of the microwave oven cavity 101 is 280-320mm in length, 180-220mm in height, and 280-320mm in depth.
  • the size of the cavity can be better matched to different food loads in the 902MHz-928MHz frequency band, and the standing waves are between 1.0 and 2.0, which can maximize the energy conversion efficiency; at the same time, it supports 2.45GHz to generate multi-mode fields.
  • HFSS is a three-dimensional electromagnetic simulation software.
  • HFSS provides a simple and intuitive user design interface, an accurate and adaptive field solver, a powerful processor with unprecedented electrical performance analysis capabilities, and it can calculate any shape of three-dimensional passive structures S-parameters and full-wave electromagnetic field.
  • HFSS software has a powerful antenna design function, it can calculate antenna parameters, such as gain, directivity, far-field pattern profile, far-field 3D map and 3dB bandwidth; draw polarization characteristics, including spherical field components, circular polarization field components , Ludwig third defines the field component and axial ratio.
  • the HFSS application has the following scenarios:
  • HFSS can quickly and accurately calculate the electromagnetic characteristics of various RF/microwave components, obtain S-parameters, propagation characteristics, high-power breakdown characteristics, optimize component performance indicators, and perform tolerance analysis to help engineers quickly complete the design And grasp the electromagnetic characteristics of various devices, including: waveguide devices, filters, converters, couplers, power distribution/combiners, ferrite circulators, isolators and cavities, etc.
  • Electric vacuum device In the design of electric vacuum devices such as traveling wave tubes, klystrons, and gyrotrons, the HFSS eigenmode solver combined with periodic boundary conditions can accurately simulate the dispersion characteristics of the device and obtain the normalized phase velocity and The frequency relationship and the electromagnetic field distribution in the structure, including H field and E field, provide powerful design methods for the design of such devices.
  • Antenna, radome and antenna array design simulation, HFSS can provide comprehensive simulation functions for antenna and system design, and accurately simulate and calculate various performances of antennas, including two-dimensional and three-dimensional far-field/near-field radiation patterns, antenna gain, Axial ratio, half-power lobe width, internal electromagnetic field distribution, antenna impedance, voltage standing wave ratio and S parameters, etc.
  • the furnace door 102 is provided with two-layer shielding, which can effectively isolate radio frequency signal leakage and meet the requirements of GB 4824-2013/IEC/CISPR 11-2010 ISM radio frequency equipment radiation and disturbance characteristics.
  • the ESC radio frequency coaxial antenna 105 is installed directly above the microwave oven cavity 101 to realize the feeding of radio frequency microwave signals.
  • the MCU controls the stepping motor and the mechanical transmission link to drive the antenna to move, change the depth of the antenna in the microwave oven cavity 101, and determine the change in the food load matching characteristics.
  • the ESC radio frequency coaxial antenna 105 also includes a shielding sleeve, the shielding sleeve includes an outer sleeve and an inner ball sleeve, the outer sleeve is fixed above the housing of the microwave cavity 101, and the inner ball sleeve wraps the antenna body 501 ,
  • the inner ball bushing is densely covered with balls to ensure the smooth movement of the antenna body 501 in the bushing and good grounding performance to achieve a better radio frequency signal shielding effect.
  • the present invention has the beneficial effects that the 900MHz frequency is low and the wavelength is 33 cm.
  • the traditional waveguide transmission mode requires a larger-sized waveguide port design and cannot be used in a small cavity.
  • the present invention adopts the antenna feeding method to realize the energy coupling of the 900MHz microwave in the miniaturized cavity.
  • the relative height of the antenna in the microwave cavity can be tracked by changing the relative height of the antenna in the cavity of the microwave oven through the up and down movement of the electric radio frequency coaxial antenna.
  • the change of the electrical constant obtains a better match, which greatly improves the energy coupling efficiency.
  • the microwave source energy conversion efficiency can reach more than 95%.
  • a low-pass filter circuit is designed on the 900MHz solid-state power amplifier.
  • the circuit presents low impedance to the 900MHz signal to ensure that the signal passes without loss.
  • it presents high impedance to the high-frequency 2.45GHz signal.
  • the antenna is also designed with high-frequency isolation indicators, which are common to the 2.45GHz high The frequency is suppressed to prevent high-frequency signals from damaging the solid-state source power amplifier through the antenna coupling, which improves the microwave conversion efficiency.

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  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Constitution Of High-Frequency Heating (AREA)
  • Control Of High-Frequency Heating Circuits (AREA)

Abstract

本发明公开了一种多微波源加热系统。该系统包括微波炉腔体和炉门，所述微波炉腔体设置有固态源以及磁控管，所述固态源与电调射频同轴天线连接，所述磁控管与微波波导激励器连接，通过所述固态源以及磁控管作为微波源共同加热。本发明所述多微波源加热系统，能够实现多种微波源共同加热，提高微波加热效率。

Description

一种多微波源加热系统
本申请要求于2019年07月03日提交中国专利局、申请号为201910596483.9、发明名称为“一种多微波源加热系统”的中国专利申请的优先权，其全部内容通过引用结合在本申请中。
技术领域
本发明涉及微波加热领域，特别是涉及一种多微波源加热系统。
背景技术
传统微波炉使用2.45GHz磁控管产生微波能量，耦合到波导再传输至腔体内给食物加热，但2.45GHz因为频率高，对食物的穿透性不够，在加热食物时容易造成内外部加热不均匀。而900MHz频率低，对食物的穿透性更好，但受制于900MHz磁控管体积以及波导传输口尺寸，一般900MHz用于工业微波加热，腔体设计较大导致900MHz无法应用于家用微波炉小体积需求。
发明内容
鉴于上述现有技术的不足，本发明的目的在于提供一种多微波源加热系统，旨在解决在家用微波炉尺寸里使得900MHz微波馈入和2.45GHz磁控管组成双源加热系统，提升加热效率和食物均匀性。
为实现上述目的，本发明提供了如下方案：
一种多微波源加热系统，包括微波炉腔体和炉门，所述微波炉腔体设置有固态源以及磁控管，所述固态源与电调射频同轴天线连接，所述磁控管与微波波导激励器连接，通过所述固态源以及磁控管作为微波源共同加热。
可选地，所述电调射频同轴天线包括天线本体、射频同轴连接器、限位轴卡以及天线盘，所述天线盘设置在所述微波炉腔体内。
可选地，所述电调射频同轴天线侧边设置有控制器，通过所述控制器控制所述天线本体与所述微波炉腔的相对位置。
可选地，所述控制器包括MCU控制器、驱动装置以及传动装置，通 过所述MCU控制器控制所述驱动装置，通过所述驱动装置的驱动，所述传动装置带动所述天线本体在所述微波炉腔体内移动，调整天线本体与微波炉腔体的相对位置。
可选地，所述固态源设置在所述微波炉腔体顶端，通过射频传输线缆与所述电调射频同轴天线连接。
可选地，所述磁控管设置在所述微波炉腔体侧边或者后边，与所述微波波导激励器通过微波波导传输线连接。
可选地，所述炉门设置有多层屏蔽层，通过所述多层屏蔽层对射频信号进行屏蔽。
可选地，所述磁控管设置有1组或多组。
可选地，所述固态源功放输出功率为300W-800W。
可选地，所述固态源功放输出频率为902MHz-928MHz。
根据本发明提供的具体实施例，本发明公开了以下技术效果：
本发明公开了一种多微波源加热系统，其中，包括微波炉腔体和炉门，所述微波炉腔体设置有固态源以及磁控管，所述固态源与电调射频同轴天线连接，所述磁控管与微波波导激励器连接，通过所述固态源以及磁控管作为微波源共同加热，本发明所述多微波源加热系统，能够实现多种微波源共同加热，提高微波加热效率。
说明书附图
下面结合附图对本发明作进一步说明：
图1为本发明多微波源加热系统的结构示意图；
图2为本发明电调射频同轴天线的局部放大示意图。
具体实施方式
下面将结合本发明实施例中的附图，对本发明实施例中的技术方案进行清楚、完整地描述，显然，所描述的实施例仅仅是本发明一部分实施例，而不是全部的实施例。基于本发明中的实施例，本领域普通技术人员在没有做出创造性劳动前提下所获得的所有其他实施例，都属于本发明保护的范围。
针对特定功率的固态源功放，受制于900MHz磁控管体积以及波导传输口尺寸，一般900MHz用于工业微波加热，腔体设计较大无法应用于家用15至30升体积需求，微波固态源(microwave solid-state oscillator)采用固态有源器件，产生微波信号的装置，所使用的固态器件一般为LDMOS(横向扩散金属氧化物半导体)和GaN(氮化镓半导体)。磁控管是一种用来产生微波能的电真空器件。实质上是一个置于恒定磁场中的二极管。管内电子在相互垂直的恒定磁场和恒定电场的控制下，与高频电磁场发生相互作用，把从恒定电场中获得能量转变成微波能量，从而达到产生微波能的目的。
本发明提出一种使用多微波源的方式进行微波加热，所述多微波源加热系统通过多种方式的微波源配合进行微波加热，提高了加热效率。
为使本发明的上述目的、特征和优点能够更加明显易懂，下面结合附图和具体实施方式对本发明作进一步详细的说明。
具体的，请参阅图1，图1为本发明所述多微波源加热系统的结构示意图，本发明公开了一种多微波源加热系统，其中，该系统包括微波炉腔体101和炉门102，所述微波炉腔体101设置有固态源103以及磁控管104，所述固态源103与电调射频同轴天线105连接，所述磁控管104与微波波导激励器106连接，通过所述固态源103以及磁控管104作为微波源共同加热。
进一步地，图2中是本发明的一个具体实施例，图2为本发明电调射频同轴天线的局部放大示意图。其中，所述电调射频同轴天线105包括天线本体501、射频同轴连接器502、限位轴卡503以及天线盘504，其中，所述射频同轴连接器502、所述限位轴卡503以及所述天线盘504从上至下依次设置，且所述天线盘504设置在所述微波炉腔体101内，所述天线本体501位于所述射频同轴连接器502和所述天线盘504之间。
进一步地，所述多微波源加热系统还包括控制器(控制器在图1中的位置关系未画出)，其中控制器设置在所述电调射频同轴天线105侧边，所述控制器用于控制所述天线本体与所述微波炉腔体101的相对位置。所述控制器包括MCU控制器、驱动装置以及传动装置，通过所述MCU控制器控制所述驱动装置，通过所述驱动装置的驱动，所述传动装置带动所 述天线本体在所述微波炉腔体101内移动，调整天线本体与微波炉腔体101的相对位置。参阅图2，最左侧的为驱动装置，通过MCU控制器信号控制开启，中间的虚线框整体是传动装置，带动电调射频同轴天线在微波炉腔体101内移动。
所述传动装置包括偏心轮以及连杆，通过驱动装置带动偏心轮转动，带动射频天线的射频同轴连接器，从而带动天线本体以及天线盘在所述微波炉腔体内上下移动。所述偏心轮包括两组，其中一组偏心轮与所述驱动装置连接，通过连杆与另一组偏心轮连接，另一组偏心轮与所述射频同轴连接器连接。所述传动装置属于往复连杆结构，由于偏心轮的特殊结构，所述驱动装置带动其中一组偏心轮转动，连杆带动第二组偏心轮转动，从而实现往复运动。往复连杆结构决定了天线行程的最高和最低点，天线永远在行程内往复运动，这样保证了整个大功率射频链路的安全可靠运行。
进一步地，本发明所述多微波源加热系统中固态源103功放作为微波源时，通过电调射频同轴天线105传输微波频率，实现射频微波信号的馈入。所述固态源103设置在所述微波炉腔体101顶端，通过射频传输线缆107与所述电调射频同轴天线105连接。所述射频传输线缆107优选为射频同轴电缆，能够保证屏蔽效率，避免微波能量流失。所述射频传输线缆107的绝缘材料采用物理发泡聚乙烯隔离铜线导体，绝缘材料的外部是另一层环形导体，这里称为外导体或者组织屏蔽层，外导体采用铜带成型、焊接或扎纹工艺；或是采用铝管结构；或是采用编织结构，整个电缆由聚氯乙烯材料的护套包住。
进一步地，所述多微波源加热系统中，所述磁控管104设置在所述微波炉腔体101侧边或者后边，与所述微波波导激励器106通过微波波导传输线108连接。现有的已知的微波波导激励器106包括波导盒、同轴连接器和天线杆，所述波导盒内具有腔体，沿所述波导盒的长度方向，所述腔体的一端敞开且另一端封闭；所述同轴连接器位于所述腔体内且上端穿过所述波导盒的所述顶壁；所述天线杆设在所述腔体内且与所述同轴连接器连通，所述天线杆的数量至少为1根，所述天线杆在垂直于所述同轴连接器的轴线的平面内延伸。
进一步地，所述多微波源加热系统中，所述炉门102设置有多层屏蔽 层，通过所述多层屏蔽层对射频信号进行屏蔽，保证屏蔽效率，减少微波能量损耗。
进一步地，所述多微波源加热系统中，所述磁控管104的个数可根据需要选取，根据不同的加热需求，可选取一个或多个磁控管104，实现一路或多路磁控管104的微波源加热。
进一步地，所述的多微波源加热系统，其中，所述固态源103功放输出功率为300W-800W，所述固态源103功放输出频率为902MHz-928MHz，上述设计能够满足小型化微波炉加热要求。
本发明采用900MHz固态源和2.45GHz磁控管作为微波源共同加热，解决传统2.45GHz磁控管微波炉加热深度不足的缺点，提高食物加热均匀性。
根据HFSS仿真得出微波炉腔体101的最佳匹配腔体尺寸为长280-320mm，高180-220mm，深280-320mm。此腔体尺寸可在902MHz-928MHz频段适应不同食物负载获得较好匹配，驻波均在1.0至2.0之间，可最大化获得能量转换效率；同时支持2.45GHz产生多模场。
HFSS是一种三维电磁仿真软件，HFSS提供了一种简洁直观的用户设计界面、精确自适应的场解器、拥有空前电性能分析能力的功能强大的处理器，能计算任意形状三维无源结构的S参数和全波电磁场。HFSS软件拥有强大的天线设计功能，它可以计算天线参量，如增益、方向性、远场方向图剖面、远场3D图和3dB带宽；绘制极化特性，包括球形场分量、圆极化场分量、Ludwig第三定义场分量和轴比。使用HFSS，可以计算:①基本电磁场数值解和开边界问题，近远场辐射问题；②端口特征阻抗和传输常数；③S参数和相应端口阻抗的归一化S参数；④结构的本征模或谐振解。而且，由Ansoft HFSS和Ansoft Designer构成的Ansoft高频解决方案，是目前唯一以物理原型为基础的高频设计解决方案，提供了从系统到电路直至部件级的快速而精确的设计手段，覆盖了高频设计的所有环节。
HFSS应用有如下几个场景：
微波器，HFSS能够快速精确地计算各种射频/微波部件的电磁特性，得到S参数、传播特性、高功率击穿特性，优化部件的性能指标，并进 行容差分析，帮助工程师们快速完成设计并把握各类器件的电磁特性，包括:波导器件、滤波器、转换器、耦合器、功率分配/合成器，铁氧体环行器、隔离器和腔体等。
电真空器，在电真空器件如行波管、速调管、回旋管设计中，HFSS本征模式求解器结合周期性边界条件，能够准确地仿真器件的色散特性，得到归一化相速与频率关系，以及结构中的电磁场分布，包括H场和E场，为这类器件的设计提供了强有力的设计手段。
天线、天线罩及天线阵设计仿真，HFSS可为天线及其系统设计提供全面的仿真功能，精确仿真计算天线的各种性能，包括二维、三维远场/近场辐射方向图、天线增益、轴比、半功率波瓣宽度、内部电磁场分布、天线阻抗、电压驻波比和S参数等。
作为一种优选的实施例，炉门102设有2层屏蔽，能有效隔离射频信号泄露，达到GB 4824-2013/IEC/CISPR 11-2010ISM射频设备辐射和骚扰特性要求。
作为一种优选的实施例，将所述电调射频同轴天线105安装在微波炉腔体101的正上方，实现射频微波信号的馈入。由MCU控制步进电机和机械传动连杆带动天线运动，改变天线在微波炉腔体101内的深度，从而确定食物负载匹配特性的变化。
所述电调射频同轴天线105还包括屏蔽轴套，所述屏蔽轴套包括外侧轴套和内侧滚珠轴套，外侧轴套固定在微波炉腔体101外壳上方，内侧滚珠轴套包裹天线本体501，内侧滚珠轴套上密布滚珠以保证天线本体501在轴套中顺滑运动以及良好的接地性能，实现较好的射频信号屏蔽效果。
与现有技术相比，本发明的有益效果在于：900MHz频率低，波长33厘米，以传统波导传输方式需要较大尺寸的波导口设计，无法用于小型腔体。而本发明采用天线馈入的方式，实现了900MHz微波在小型化腔体内的能量耦合，通过电调射频同轴天线的上下运动改变天线在微波炉腔体内的相对高度可以跟踪不同状态下食物负载介电常数的变化从而获得更好的匹配，极大的提高了能量耦合效率，根据实验验证，微波源能量转换效率能达到95％以上。配合一路或两路2.45GHz磁控管，提供超过2千瓦的微波加热功率实现快速均匀加热。在900MHz固态源功放上设计 低通滤波电路，电路对900MHz信号呈现低阻抗以保证信号无损通过，同时对高频2.45GHz信号呈现高阻抗，天线也设计有高频隔离指标，共同对2.45GHz高频进行抑制，防止高频信号经天线耦合损毁固态源功放，提高了微波转换效率。
上面结合附图对本发明的实施方式作了详细说明，但是本发明并不限于上述实施方式，在所属技术领域普通技术人员所具备的知识范围内，还可以在不脱离本发明宗旨的前提下做出各种变化。

Claims (10)

  1. 一种多微波源加热系统，其特征在于，包括微波炉腔体和炉门，所述微波炉腔体设置有固态源以及磁控管，所述固态源与电调射频同轴天线连接，所述磁控管与微波波导激励器连接，通过所述固态源以及磁控管作为微波源共同加热。
  2. 根据权利要求1所述的多微波源加热系统，其特征在于，所述电调射频同轴天线包括天线本体、射频同轴连接器、限位轴卡以及天线盘，所述天线盘设置在所述微波炉腔体内。
  3. 根据权利要求2所述的多微波源加热系统，其特征在于，所述电调射频同轴天线侧边设置有控制器，通过所述控制器控制所述天线本体与所述微波炉腔的相对位置。
  4. 根据权利要求3所述的多微波源加热系统，其特征在于，所述控制器包括MCU控制器、驱动装置以及传动装置，通过所述MCU控制器控制所述驱动装置，通过所述驱动装置的驱动，所述传动装置带动所述天线本体在所述微波炉腔体内移动，调整天线本体与微波炉腔体的相对位置。
  5. 根据权利要求4所述的多微波源加热系统，其特征在于，所述固态源设置在所述微波炉腔体顶端，通过射频传输线缆与所述电调射频同轴天线连接。
  6. 根据权利要求1所述的多微波源加热系统，其特征在于，所述磁控管设置在所述微波炉腔体侧边或者后边，与所述微波波导激励器通过微波波导传输线连接。
  7. 根据权利要求1所述的多微波源加热系统，其特征在于，所述炉门设置有多层屏蔽层，通过所述多层屏蔽层对射频信号进行屏蔽。
  8. 根据权利要求6所述的多微波源加热系统，其特征在于，所述磁控管设置有1组或多组。
  9. 根据权利要求1所述的多微波源加热系统，其特征在于，所述固态源功放输出功率为300W-800W。
  10. 根据权利要求1所述的多微波源加热系统，其特征在于，所述固态源功放输出频率为902MHz-928MHz。
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