本文選題：高溫超導(dǎo)薄膜 + 多通帶濾波器�。� 參考：《天津理工大學(xué)》2015年碩士論文

【摘要】：利用高溫超導(dǎo)薄膜材料可以設(shè)計制作性能優(yōu)異的微帶濾波器,由于超導(dǎo)薄膜材料的表面電阻在微波射頻頻段,要比常規(guī)導(dǎo)體銅材料低1~3個數(shù)量級。因此可以用來設(shè)計制作高階數(shù)的高溫超導(dǎo)濾波器,其插入損耗可以保持很低的水平(通常可以控制在0.5d B以下)。高溫超導(dǎo)濾波器因此具有極高的帶外抑制,近乎為矩形的選頻窗口,大幅度節(jié)省了過渡帶寬。原有射頻接收系統(tǒng)采用高溫超導(dǎo)濾波器替換以后,明顯提高了基站通信接收端的靈敏度,擴大了信號覆蓋范圍,增強了對干擾信號的抑制,消除了互調(diào)制響應(yīng),同時將濾波器放在接收機最前端,有效的保護了低噪聲放大器,使其避免過強信號的沖擊飽和,而不增加系統(tǒng)的整體噪聲系數(shù)。所以高溫超導(dǎo)濾波器在民用通信、警用集群通訊、軍事抗干擾通訊、以及雷達精確制導(dǎo)、艦船飛行器精密導(dǎo)航等方面有著極強的應(yīng)用潛力。由于所有的通信頻段幾乎都集中在射頻微波頻段,加之現(xiàn)有通訊協(xié)議頻段的更新以及許多新的通訊協(xié)議提出,使頻譜資源變得越來越緊張。而且同一協(xié)議的不同頻段間又間隔著其它通訊設(shè)施的頻段,而許多帶通濾波器的組合將給通訊基站接收端設(shè)備帶了沉重負擔(dān),不但增加了設(shè)備占地空間,還增加了系統(tǒng)后期解調(diào)難度。所以在一塊芯片上同時實現(xiàn)對多個頻段的同時通訊,可以有效減少系統(tǒng)接收設(shè)備的損耗,減小設(shè)備整體體積,實現(xiàn)設(shè)備的小型化,降低成本。本文主要結(jié)合頻率資源日益緊張的問題以及高溫超導(dǎo)材料在制作濾波器方面的優(yōu)勢,設(shè)計實現(xiàn)了兩款多通帶高溫超導(dǎo)濾波器。首先設(shè)計了一款雙通帶高溫超導(dǎo)濾波器,濾波器采用傳統(tǒng)級聯(lián)結(jié)構(gòu),分別按照指標(biāo)要求對帶通電路、帶阻電路單獨設(shè)計,將兩種電路級聯(lián)實現(xiàn)雙通帶特性,濾波器采用以鋁酸鑭為襯底的鏑鋇銅氧高溫超導(dǎo)薄膜制作,測試環(huán)境為低溫真空。其次設(shè)計了一款三通帶高溫超導(dǎo)濾波器,濾波器設(shè)計是在帶通電路基礎(chǔ)上,通過非鄰近諧振器間引入強交叉耦合,將理論傳輸零點引入帶內(nèi),設(shè)計出了兩個阻帶。在設(shè)計中給出了電路的理論耦合矩陣參數(shù)的優(yōu)化方法,并詳述了電磁場仿真軟件搭建電路方法。本文最終利用高溫超導(dǎo)薄膜材料實現(xiàn)了雙通帶與三通帶濾波器,兩款濾波器經(jīng)仿真驗證都顯示出了良好的多通帶特性,證實了基于以上理論實現(xiàn)多通帶的可行性。制作出的雙通帶濾波器經(jīng)過低溫測試帶內(nèi)插損優(yōu)于0.2d B,并在低頻端產(chǎn)生了寄生的傳輸零點,增強了帶外抑制。
[Abstract]:Microstrip filters with excellent properties can be designed and fabricated by using HTS thin film materials. Because the surface resistance of the superconducting thin films is in the microwave RF frequency band, it is 1 ~ 3 orders of magnitude lower than that of conventional conducting copper materials. Therefore, it can be used to design and fabricate high-order HTS filters, and the insertion loss can be kept at a very low level (usually controlled below 0.5 dB). As a result, HTS filters have extremely high out-of-band suppression and a rectangular frequency window, which greatly saves the transition bandwidth. After replacing the original RF receiver with HTS filter, the sensitivity of the base station communication receiver is obviously improved, the signal coverage is enlarged, the interference signal is suppressed, and the mutual modulation response is eliminated. At the same time, the filter is placed at the front of the receiver, which effectively protects the low noise amplifier from the shock saturation of the overstrong signal and does not increase the overall noise coefficient of the system. So HTS filter has great potential in civil communication, police trunking communication, military anti-jamming communication, radar precision guidance, ship aircraft precision navigation and so on. Since almost all the communication frequency bands are concentrated in the RF and microwave frequency band, together with the updating of the frequency band of the existing communication protocol and many new communication protocols, the spectrum resources become more and more tight. Moreover, the different frequency bands of the same protocol are spaced between the frequency bands of other communication facilities, and the combination of many bandpass filters will bring a heavy burden to the equipment at the receiving end of the communication base station, which not only increases the space occupied by the equipment, It also increases the difficulty of system demodulation. So the simultaneous communication of multiple frequency bands on a single chip can effectively reduce the loss of the system receiving equipment, reduce the overall volume of the equipment, realize the miniaturization of the equipment, and reduce the cost. In this paper, considering the shortage of frequency resources and the advantages of HTS materials in making filters, two kinds of multiband HTS filters are designed and implemented. First, a double-pass high-temperature superconducting filter is designed. The filter adopts the traditional cascade structure. The band-pass circuit and the band-stop circuit are designed separately according to the requirements of the index. The two circuits are cascaded to realize the double-pass-band characteristic. The filter is fabricated by dysprosium barium copper oxide high temperature superconducting thin film on the substrate of lanthanum aluminate. The test environment is low temperature vacuum. Secondly, a three-pass high-temperature superconducting filter is designed. Based on the bandpass circuit, a strong cross-coupling is introduced between the non-adjacent resonators, and the theoretical transmission zeros are introduced into the band, and two stopbands are designed. In the design, the optimization method of the theoretical coupling matrix parameters of the circuit is given, and the circuit method of the electromagnetic field simulation software is described in detail. In this paper, double pass band filter and three pass band filter are realized by using HTS thin film material. The simulation results show that the two filters have good multi pass band characteristics, which proves the feasibility of realizing multi pass band based on the above theory. The band insertion loss of the double pass band filter measured at low temperature is better than 0.2 dB, and the parasitic transmission zero is generated at the low frequency end, which enhances the out-of-band suppression.
【學(xué)位授予單位】：天津理工大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：TN713.5

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