本文選題：準(zhǔn)光波束功率合成 + 反射鏡��； 參考：《東南大學(xué)》2017年碩士論文

【摘要】：隨著亞毫米波、太赫茲技術(shù)的發(fā)展,要求提高信號(hào)源輸出功率以滿足系統(tǒng)需求。目前為止,無(wú)論是電真空技術(shù)、光技術(shù)或固態(tài)電子技術(shù),在太赫茲波段都很難產(chǎn)生滿足系統(tǒng)要求的輸出功率。在單個(gè)發(fā)射機(jī)輸出功率難以滿足需求的情況下,在微波毫米波頻段廣泛采用的功率合成技術(shù)是提高輸出功率的一條有效的技術(shù)途徑。傳統(tǒng)電路級(jí)的固態(tài)功率合成技術(shù)通過(guò)傳輸線進(jìn)行功率傳輸,隨著合成器件數(shù)目的增加,電路長(zhǎng)度、電路節(jié)點(diǎn)以及損耗都在增加,最終會(huì)抵消功率合成優(yōu)勢(shì)。波導(dǎo)空間功率合成技術(shù)雖然物理結(jié)構(gòu)相比電路簡(jiǎn)單,但是隨著工作頻率的升高,波導(dǎo)的尺寸越來(lái)越小,在太赫茲頻段實(shí)現(xiàn)這個(gè)技術(shù)難度太大。因此,波導(dǎo)空間功率合成技術(shù)在太赫茲波段難以應(yīng)用。準(zhǔn)光波束功率合成技術(shù)把多個(gè)波束在自由空間中疊加,再合成一個(gè)大波束來(lái)實(shí)現(xiàn)功率合成。各功率單元之間采用并行工作方式,避免了電路以及波導(dǎo)功率合成在高頻領(lǐng)域合成數(shù)量受限以及損耗大等缺陷。該技術(shù)適合毫米波高頻段和太赫茲頻段的功率合成,且不論要合成的電磁波是由電真空技術(shù)、光技術(shù)還是固態(tài)電子技術(shù)產(chǎn)生,只要它們是相干的即可。本文在前人的基礎(chǔ)之上,設(shè)計(jì)研究了一種由雙曲鏡面和橢球鏡面組成的N路對(duì)稱結(jié)構(gòu)的準(zhǔn)光波束功率合成網(wǎng)絡(luò)。利用橢球反射鏡和雙曲反射鏡對(duì)高斯束的變換特性,實(shí)現(xiàn)N路相干高斯波束到單路波束的傳輸轉(zhuǎn)換。同時(shí),設(shè)計(jì)波紋結(jié)構(gòu)和賦形曲線結(jié)構(gòu)的兩種模式轉(zhuǎn)換模塊,通過(guò)模式轉(zhuǎn)換模塊,將合成波束中的高斯高次分量轉(zhuǎn)換為高斯主模,其中經(jīng)賦形結(jié)構(gòu)變換后的波束合成效率可以達(dá)到74.75%,高斯耦合效率高達(dá)96.58%。最后,設(shè)計(jì)了基于雙橢球反射面結(jié)構(gòu)的功率合成網(wǎng)絡(luò)。通過(guò)圓錐部件減小合成波束的半徑,在變換后的波束后端添加雙橢球反射面通道,利用橢球反射面的波束匯聚效果,對(duì)波束進(jìn)行兩次匯聚變換,從而實(shí)現(xiàn)波束在空間的匯聚,能量在中心區(qū)域集中分布,仿真計(jì)算的波束合成效率可以達(dá)到:87.65%。
[Abstract]:With the development of submillimeter wave and terahertz technology, it is necessary to improve the output power of the signal source to meet the system requirements. Up to now, it is very difficult to produce output power in terahertz band, whether it is electric vacuum technology, optical technology or solid-state electronic technology. Under the condition that the output power of a single transmitter is difficult to meet the demand, the widely used power combination technology in the microwave and millimeter wave band is an effective technical way to improve the output power. The traditional solid-state power synthesis technology transmits power through transmission lines. With the increase of the number of composite devices, the length of the circuit, the circuit node and the loss are all increasing, which will eventually cancel the power combination advantage. Although the physical structure of waveguide space power synthesizer is simpler than that of circuit, with the increase of operating frequency, the size of waveguide becomes smaller and smaller, so it is very difficult to realize this technique in terahertz band. Therefore, waveguide space power synthesis technology is difficult to be applied in terahertz band. Quasi-optical beam power synthesis technique superposes multiple beams in free space and then synthesizes a large beam to achieve power synthesis. The parallel operation mode is adopted among the power units to avoid the limitation of the number and loss of the circuit and waveguide power synthesis in the high frequency domain. This technique is suitable for the power combination of millimeter wave high frequency band and terahertz band, regardless of whether the electromagnetic wave to be synthesized is produced by electric vacuum technology, optical technology or solid state electronic technology, as long as they are coherent. In this paper, a quasi-optical beam power synthesis network with N-path symmetric structure composed of hyperbolic mirror and ellipsoidal mirror is designed and studied on the basis of previous studies. The transformation characteristics of ellipsoidal mirror and hyperbolic mirror to Gao Si beam are used to realize the transfer of N-channel coherent Gao Si beam to single-channel beam. At the same time, two mode conversion modules of corrugated structure and shape curve structure are designed. Through the mode conversion module, the Gao Si high-order component in the composite beam is converted into the Gao Si main mode. The beam-forming efficiency can reach 74.75 and the coupling efficiency of Gao Si is 96.58. Finally, a power synthesis network based on double ellipsoid reflector structure is designed. The radius of the composite beam is reduced by conical component, and a double-ellipsoidal reflector channel is added to the rear end of the transformed beam. Using the beam convergence effect of the ellipsoidal reflector, the beam is converged twice to realize the convergence of the beam in the space. The energy distribution is concentrated in the center area, and the efficiency of beam synthesis can reach to 87.65%.
【學(xué)位授予單位】：東南大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類號(hào)】：TN73

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本文編號(hào)：1781719