本文關(guān)鍵詞： 毫米波 EID 慢波諧振系統(tǒng) 色散曲線 工作模式　出處：《電子科技大學(xué)》2015年碩士論文　論文類型：學(xué)位論文

【摘要】：毫米波是頻率范圍為30GHz~300GHz范圍內(nèi)的電磁波,介于微波、紅外、光波之間。因此兼有這幾個(gè)特點(diǎn):第一,波束窄。第二,極寬的帶寬。第三,毫米波器件的尺寸較微波器件而言要小很多。第四,相比激光來說,它的傳播特性受氣候的影響小,接近全天候特性。擴(kuò)展互作用器件(EID,Extended Interaction Devices)是在二十世紀(jì)六十年代發(fā)展起來的,互作用機(jī)理介于行波管和速調(diào)管之間的毫米波真空電子器件,主要有擴(kuò)展互作用速調(diào)管(EIK,Extended Interaction Klystron)和擴(kuò)展互作用振蕩器(EIO,Extended Interaction Oscillator)。與行波管和速調(diào)管相比,擴(kuò)展互作用器件采用的慢波諧振系統(tǒng)兼顧了兩者的優(yōu)點(diǎn),既可以獲得高增益和效率,又可以獲得足夠大的帶寬。EID在毫米波、亞毫米波頻段有非常大的發(fā)展的潛力,該器件具有結(jié)構(gòu)緊湊、重量輕、體積小、大帶寬、工作電壓低、輸出功率高等特點(diǎn)。目前國際上一些國家在衛(wèi)星通訊、深空拓?fù)涑上瘛夂虻挠^測(cè)等一些項(xiàng)目上越來越多地采用了EID。本文主要對(duì)毫米波段0.14THz帶狀注擴(kuò)展互作用器件慢波諧振系統(tǒng)進(jìn)行了初步研究。本文采用高頻電磁模擬軟件CST(Computer Simulation Technology)和CHIPIC軟件分別對(duì)其進(jìn)行了冷腔仿真和熱腔仿真,分析了慢波諧振系統(tǒng)的各結(jié)構(gòu)參數(shù)對(duì)其影響,得到一組較優(yōu)的結(jié)構(gòu)參數(shù)值來構(gòu)建模型。然后基于前面構(gòu)建的模型,針對(duì)該慢波諧振系統(tǒng)進(jìn)行了色散曲線的仿真計(jì)算。在色散曲線與PIC仿真的基礎(chǔ)上,對(duì)模式競(jìng)爭(zhēng)進(jìn)行了分析,選取了?模為工作模式,并給予了論證。最后PIC仿真結(jié)果表明在較低工作電壓18.2kV,工作電流0.5A的條件下,該諧振系統(tǒng)的注波互作用效率可達(dá)到22%,工作模式為?模,輸出平均功率可達(dá)1.98kW,工作頻率為149.4GHz。并且在相同的結(jié)構(gòu)參數(shù)以及相同電子注橫截面積與密度的條件下,對(duì)帶狀束EIO與柱形束EIO進(jìn)行了比較,最終模擬輸出結(jié)果表明帶狀注EIO比柱狀注EIO有更高的輸出功率和注波互作用效率。這是因?yàn)閹钭M截面上的縱向電場(chǎng)更加均勻,導(dǎo)致電子受到的密度調(diào)制更加均勻、群居效果更好;另外,帶狀注的耦合阻抗更大。
[Abstract]:Millimeter wave is an electromagnetic wave in the frequency range of 30 GHz or 300 GHz, which is between microwave, infrared and light waves. Therefore, it has the following characteristics: first, narrow beam and second. Wide bandwidth. Third, millimeter-wave devices are much smaller in size than microwave devices. 4th, its propagation characteristics are less affected by climate than lasers. The extended Interaction devices were developed in 1960s. The interaction mechanism is between the traveling wave tube and the klystron millimeter wave vacuum electronic device, mainly has the extended interaction klystron EIK. Extended Interaction Klystron) and extended interaction oscillator EIO. Compared with travelling-wave tube and klystron, the slow wave resonance system used in the extended interaction device takes into account the advantages of Extended Interaction oscillator and klystron. Both high gain and efficiency can be obtained, and the bandwidth. EID in millimeter wave, sub-millimeter wave band has a great potential for development, the device has a compact structure, light weight, small volume. Large bandwidth, low operating voltage, high output power and other characteristics. At present, some countries in the world in satellite communications, deep space topology imaging. EIDs have been used more and more in some projects such as climate observation. The slow wave resonance system of 0.14 THz band beam spread interaction device in millimeter band is studied in this paper. Magnetic simulation software CST(. The cold cavity simulation and the thermal cavity simulation are carried out by Computer Simulation Technology and CHIPIC software respectively. The influence of structural parameters on the slow wave resonance system is analyzed, and a set of optimal structural parameters are obtained to build the model. Then, the model is constructed based on the previous model. The dispersion curve of the slow wave resonance system is simulated. On the basis of the dispersion curve and PIC simulation, the mode competition is analyzed. Finally, the PIC simulation results show that the working voltage is 18.2kV and the working current is 0.5A. The beam-wave interaction efficiency of the resonant system can reach 22. Mode, the average output power can reach 1.98 kW, the working frequency is 149.4 GHz, and under the same structural parameters and the same electron beam cross sectional area and density. The EIO of banded bundles and EIO of columnar bundles were compared. The simulation results show that EIO has higher output power and beam-wave interaction efficiency than cylindrical EIO, which is because the longitudinal electric field is more uniform on the strip beam cross section. As a result, the density modulation of electrons is more uniform and the group effect is better. In addition, the coupling impedance of the band beam is larger.
【學(xué)位授予單位】：電子科技大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類號(hào)】：TN015

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本文編號(hào)：1450516