本文選題：高溫超導(dǎo) + 多通帶濾波器　； 參考：《清華大學(xué)》2016年博士論文

【摘要】：濾波器用于抑制帶外干擾信號,是決定無線通信系統(tǒng)與探測系統(tǒng)帶外抗干擾能力和靈敏度的關(guān)鍵部件。隨著現(xiàn)代通信技術(shù)的不斷發(fā)展,通信設(shè)備朝著多頻化、集成化和緊湊化的方向不斷前行,迫切需要具有多個工作頻帶的多通帶濾波器。采用多模型諧振器設(shè)計的濾波器具有更加緊湊的結(jié)構(gòu),更低的損耗和噪聲。受常規(guī)電路材料損耗和設(shè)計方法的限制,基于多模諧振器設(shè)計的多通帶濾波器普遍存在節(jié)數(shù)較低、損耗較大的問題。利用高溫超導(dǎo)材料微波損耗極低的優(yōu)異特性,可實現(xiàn)插入損耗小、帶邊陡峭、帶外抑制度高的高性能帶通濾波器。因此,集合多通帶工程應(yīng)用需求、超導(dǎo)濾波器和多模諧振器性能優(yōu)點(diǎn)的高溫超導(dǎo)多通帶濾波器具有重要的學(xué)術(shù)研究意義和工程應(yīng)用價值。本論文針對基于多模諧振設(shè)計多通帶濾波器的難點(diǎn)進(jìn)行了研究,并提出了相關(guān)解決方案:(1)提出一種基于S21群時延特性的多模諧振器外部品質(zhì)因數(shù)Qe提取方法,解決了多模諧振器因多個諧振模式的頻率特性互相影響,導(dǎo)致外部品質(zhì)因數(shù)Qe提取困難的問題。提出一種優(yōu)化設(shè)計方法,根據(jù)所要設(shè)計的濾波器技術(shù)參數(shù)推導(dǎo)得到所需的諧振頻率,并最終計算出五模諧振器的結(jié)構(gòu)初值,避免了盲目調(diào)節(jié),提高了設(shè)計效率。利用以上方法用一個五模諧振器設(shè)計并制作了雙通帶濾波器,制作后的測試結(jié)果性能優(yōu)異。(2)提出了一種新型的三模嵌入式枝節(jié)線加載諧振器結(jié)構(gòu)和容性負(fù)載平行耦合線方法,解決了三模諧振器在三個諧振頻率處同時滿足相同耦合系數(shù)的難題。提出了一種雙饋線搭接的外部耦合結(jié)構(gòu),提高了濾波器制作的穩(wěn)定性、降低濾波器損耗,制作出了性能優(yōu)異、結(jié)構(gòu)緊湊的高溫超導(dǎo)三通帶濾波器。(3)構(gòu)建了一種易于調(diào)節(jié)頻率的枝節(jié)線加載的四模諧振器,采用電耦合和磁耦合分離的方法,使得各個模式的耦合系數(shù)可獨(dú)立控制、調(diào)節(jié)。提出了2個搭接饋線和2個耦合饋線的四饋線外部耦合結(jié)構(gòu),解決了各個模式外部耦合的獨(dú)立可控的問題。設(shè)計并制作了性能優(yōu)異、結(jié)構(gòu)緊湊的高溫超導(dǎo)四通帶濾波器。最終解決了采用四模諧振器設(shè)計中心頻率和帶寬獨(dú)立可控的四通帶濾波器的難題。
[Abstract]:The filter is used to suppress the out-of-band interference signal and is the key component to determine the anti-jamming ability and sensitivity of the wireless communication system and the detection system. With the development of modern communication technology, the communication equipment is moving forward in the direction of multi-frequency, integration and compactness. It is urgent to have multi-band filter with multiple working bands. The filter designed with multi-model resonator has more compact structure, lower loss and lower noise. Due to the limitation of conventional circuit material loss and design method, the multipass filter based on multi-mode resonator generally has the problem of low number of nodes and large loss. The high performance bandpass filter with low insertion loss, steep band edge and high outband suppression can be realized by using the excellent characteristics of high temperature superconducting material with extremely low microwave loss. Therefore, high temperature superconducting multiband filters with the advantages of superconducting filters and multi-mode resonators have important academic significance and engineering application value. In this paper, the difficulty of designing multipass band filter based on multimode resonance is studied, and the related solution: 1) A method of extracting external quality factor Qe of multimode resonator based on S21 group delay characteristic is proposed. The problem of external quality factor Qe extraction due to the influence of frequency characteristics of multiple resonant modes on multimode resonators is solved. An optimal design method is proposed to derive the required resonant frequency according to the technical parameters of the filter to be designed. Finally, the structure initial value of the five-mode resonator is calculated, which avoids the blind adjustment and improves the design efficiency. Using the above method, a two-pass band filter is designed and fabricated with a five-mode resonator, and the test results are excellent. A novel three-mode embedded side-line loaded resonator structure and capacitive load parallel coupling line method is proposed. The problem of three-mode resonator satisfying the same coupling coefficient at three resonant frequencies is solved. In this paper, an external coupling structure of doubly-fed lapping is proposed, which improves the stability of filter fabrication, reduces the filter loss, and makes the filter with excellent performance. A four-mode resonator, which is easy to adjust the frequency and loaded by a branch line, is constructed. The coupling coefficient of each mode can be independently controlled and adjusted by using the method of electric coupling and magnetic coupling separation. The external coupling structure of four feeders with two overlapped feeders and two coupling feeders is proposed, which solves the problem of independent and controllable external coupling of each mode. A high temperature superconducting four pass band filter with excellent performance and compact structure is designed and fabricated. Finally, the four-mode resonator is used to design a four-pass filter with independent and controllable center frequency and bandwidth.
【學(xué)位授予單位】：清華大學(xué)
【學(xué)位級別】：博士
【學(xué)位授予年份】：2016
【分類號】：TN713

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