本文關鍵詞： 頻率選擇表面 熔融石英陶瓷 高溫共燒陶瓷工藝 軋膜　出處：《電子科技大學》2014年碩士論文　論文類型：學位論文

【摘要】：隨著電磁隱身技術在國防科技領域的迅猛發(fā)展,頻率選擇表面(FSS)天線罩已經逐漸成為關鍵技術而受到人們越來越多的重視。FSS天線罩不僅起著承載、隔熱等作用,還對電磁波進行頻率選擇,從而有效降低飛行器雷達散射截面(RCS),實現電磁隱身。隨著飛行器飛行速度的不斷提高,傳統(tǒng)有機材料天線罩已經不能適應超高速飛行過程中產生的高溫惡劣環(huán)境,具有良好透波性能、耐高溫、抗熱沖擊、高機械強度的陶瓷材料成為天線罩材料的熱門。而如何成功制備陶瓷基FSS天線罩已經成為超高速飛行器隱身技術的瓶頸。本文在前人基礎上對陶瓷基頻率選擇表面做了相關研究工作。一方面研究了頻率選擇表面的基本原理以及在天線罩中的應用,成功設計出多種X波段帶通型多屏頻率選擇表面。另一方面以摻雜Li2O-K2O-Al2O3石英陶瓷為原料,并采用高溫共燒陶瓷工藝(HTCC)探索平板多屏陶瓷基FSS的制備方法,解決了相關技術難題并獲得相關工藝參數。首先,本文對摻雜Li2O-K2O-Al2O3石英陶瓷的性能進行了研究,測試并分析了摻雜石英陶瓷的介電性能、力學性能和熱學性能。實驗測試證明,該陶瓷介電常數可達4.37,介電損耗0.0038(14GHz),常溫下抗彎強度可達163MPa,成功克服了傳統(tǒng)石英陶瓷機械強度差的缺點。同時陶瓷結構十分致密,可望具有一定的抗雨蝕砂蝕能力。該材料具有作為天線罩材料的潛力并可與HTCC工藝兼容。其次,本文總結了FSS的基本理論、分類以及應用并設計出多種X波段多屏FSS。本文在傳統(tǒng)耶路撒冷十字結構多屏FSS的基礎上通過采取改進優(yōu)化措施如采用封閉環(huán)狀結構、加載金屬枝節(jié)等措施成功設計出各具特點的多屏FSS。仿真證明對普通耶路撒冷十字單元加載環(huán)狀結構可以使FSS具有更小的單元尺寸并提升其入射角度穩(wěn)定性,消除帶外波形畸變并提升帶外抑制性能;對FSS單元加載金屬枝節(jié)能有效降低FSS單元尺寸提升入射角度穩(wěn)定性;采用新型結構天線-濾波器-天線結構可以產生單邊陡降濾波響應,同時使FSS具有較低的剖面,這都是傳統(tǒng)FSS所不具有的;采用高階分形結構FSS具有較好的帶外抑制和入射角度穩(wěn)定性。再次,本文采用摻雜Li2O-K2O-Al2O3石英陶瓷作為原料,并首次采用高溫共燒陶瓷工藝(HTCC)制備平板多層FSS,并對各項工藝做了初步的探索,成功解決了軋膜、印刷、等靜壓、排膠等工藝難題。本文先后采用聚乙酸乙烯酯和PVB作為粘結劑軋膜,并摸索出適合的排膠燒結制度。文章在最后探討了工藝中常遇到的問題,并分析了可能原因。
[Abstract]:With the rapid development of electromagnetic stealth technology in the field of national defense science and technology, FSS radome has gradually become a key technology and has been paid more and more attention to. FSS radome not only plays a role in carrying capacity and heat insulation, but also plays an important role. In addition, the frequency of electromagnetic wave is selected to effectively reduce the radar cross section (RCS) of aircraft and realize electromagnetic stealth. The traditional organic material radome can not adapt to the high temperature and bad environment produced during the ultra high speed flight, and has good wave permeability, high temperature resistance and thermal shock resistance. Ceramic materials with high mechanical strength have become a hot topic in radome materials. However, how to successfully fabricate ceramic based FSS radome has become the bottleneck of stealthy technology of ultra-high speed aircraft. On the one hand, the basic principle of frequency selective surface and its application in radome are studied. Several X-band band-pass multi-screen frequency-selective surfaces have been successfully designed. On the other hand, using doped Li2O-K2O-Al2O3 quartz ceramics as raw materials, and using high-temperature co-fired ceramics process, the preparation method of FSS based on flat multi-screen ceramics has been explored. At first, the properties of doped Li2O-K2O-Al2O3 quartz ceramics are studied, and the dielectric properties, mechanical properties and thermal properties of doped quartz ceramics are tested and analyzed. The dielectric constant of the ceramic can reach 4.37, the dielectric loss is 0.0038 / 14GHz, and the bending strength can reach 163MPa at room temperature, which successfully overcomes the shortcoming of the mechanical strength of the traditional quartz ceramics, and the structure of the ceramic is very compact. It is expected to have a certain ability to resist rain erosion and sand erosion. This material has the potential as a radome material and can be compatible with HTCC process. Secondly, the basic theory of FSS is summarized in this paper. Classification, application and design of various X-band multi-screen FSs. Based on the traditional Jerusalem cross multi-screen FSS, this paper adopts some improved optimization measures, such as the closed ring structure, The multi-screen FSs with different characteristics are successfully designed by loading metal branches. The simulation results show that loading the annular structure of the common Jerusalem cross elements can make the FSS have smaller unit size and improve the stability of the incident angle. The external wave distortion is eliminated and the out-of-band suppression performance is enhanced, and the stability of the incident angle can be effectively reduced by the addition of metal branches to the FSS unit. Adopting a new structure antenna-filter-antenna structure can produce one-sided steep filtering response and make FSS have a lower profile which is not available in traditional FSS. The high order fractal structure FSS has good stability of out of band suppression and incidence angle. Thirdly, the doped Li2O-K2O-Al2O3 quartz ceramics are used as raw materials. The multilayer FSSs were prepared by high temperature co-fired ceramic process (HTCCC) for the first time, and preliminary exploration was made for each process, which successfully solved the problems of film rolling, printing and isostatic pressing. In this paper, poly (vinyl acetate) and PVB were used as binder to roll the film, and the suitable sintering system was found out. At last, the problems often encountered in the process were discussed, and the possible reasons were analyzed.
【學位授予單位】：電子科技大學
【學位級別】：碩士
【學位授予年份】：2014
【分類號】：TN820.81

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