【摘要】：隨著現(xiàn)代無線通信的飛速發(fā)展,微波毫米波系統(tǒng)的運用越來越廣泛,同時頻譜資源的擁擠問題也日益突出。為了更有效地利用有限的頻譜資源,同時也為了更好地減小通信系統(tǒng)的體積和復(fù)雜度,可調(diào)濾波器作為微波可重構(gòu)系統(tǒng)的重要組成部分因能夠同時兼顧體積和性能而受到越來越多科研人員的重視。本文主要研究基于變?nèi)荻䴓O管的頻率和帶寬可調(diào)帶通濾波器的設(shè)計�？烧{(diào)濾波器經(jīng)過幾十年的研究,分別在頻率和帶寬可調(diào)方面取得很大的進展,但是在設(shè)計中仍存在插損大、調(diào)諧范圍小、絕對帶寬變化、濾波性能不穩(wěn)定等諸多難題。針對這些問題,本文主要完成了兩款頻率和帶寬可調(diào)帶通濾波器設(shè)計,實現(xiàn)了寬范圍調(diào)諧、絕對帶寬恒定、濾波性能穩(wěn)定等。本文主要內(nèi)容如下:首先,簡單介紹了奇偶模分析方法,從耦合矩陣出發(fā)推導(dǎo)并討論了濾波器在可調(diào)諧狀態(tài)下的穩(wěn)定條件,同時對穩(wěn)定條件中所涉及的耦合系數(shù)及品質(zhì)因數(shù)等問題進行詳細介紹,接著總結(jié)了不同的可調(diào)濾波器的的實現(xiàn)方法并總結(jié)了各自優(yōu)缺點。其次,研究了頻率和帶寬獨立可調(diào)濾波器的設(shè)計。對國內(nèi)外相關(guān)的文獻資料進行整理分析,分別介紹了頻率可調(diào)和帶寬可調(diào)的實現(xiàn)原理及實現(xiàn)方法�；谏鲜鰧崿F(xiàn)原理及實現(xiàn)方法,從結(jié)構(gòu)、耦合系數(shù)、外部品質(zhì)因數(shù)、變?nèi)莨躋值等方面對可調(diào)濾波器性能影響進行分析,設(shè)計實現(xiàn)了基于U型諧振器的頻率和帶寬獨立可調(diào)濾波器,并對提出的可調(diào)濾波器進行了加工和測試,測試結(jié)果與仿真結(jié)果吻合良好。最后,對濾波性能穩(wěn)定的微帶可調(diào)濾波器進行了研究。設(shè)計濾波器時考慮外部品質(zhì)因數(shù)的影響,在諧振器和輸入輸出端口間引入外部品質(zhì)因數(shù)調(diào)諧電路。在此基礎(chǔ)上,提出設(shè)計了一款基于SLR結(jié)構(gòu)的頻率和帶寬可調(diào)濾波器,并對提出的濾波器進行了加工測試,吻合良好的仿真結(jié)果和實測結(jié)果顯示該濾波器具有插損小、濾波性能穩(wěn)定等優(yōu)點,實現(xiàn)了寬范圍調(diào)諧,尤其帶寬的寬范圍調(diào)諧,并且在頻率可調(diào)過程中絕對帶寬恒定不變,帶寬可調(diào)過程中中心頻率保持不變。
[Abstract]:With the rapid development of modern wireless communication, microwave and millimeter wave systems are used more and more widely. At the same time, the congestion of spectrum resources is becoming more and more prominent. In order to make more efficient use of the limited spectrum resources, but also to better reduce the volume and complexity of the communication system, As an important part of microwave reconfigurable system, tunable filters have been paid more and more attention by researchers because they can take both size and performance into account. In this paper, the design of frequency and bandwidth tunable bandpass filter based on varactor diode is studied. After decades of research, the tunable filter has made great progress in frequency and bandwidth adjustable, but there are still many difficult problems in the design, such as large insertion loss, small tuning range, absolute bandwidth variation, instability of filter performance and so on. In order to solve these problems, two kinds of band-pass filters with adjustable frequency and bandwidth are designed in this paper, which can achieve wide tuning, constant absolute bandwidth and stable filtering performance. The main contents of this paper are as follows: firstly, the odd-even mode analysis method is briefly introduced, and the stability conditions of the filter in the tunable state are derived and discussed from the coupling matrix. At the same time, the coupling coefficient and quality factor involved in the stability condition are introduced in detail, then the implementation methods of different tunable filters are summarized and their advantages and disadvantages are summarized. Secondly, the design of frequency and bandwidth independent tunable filter is studied. The related literature at home and abroad is analyzed, and the realization principle and method of adjustable frequency bandwidth are introduced respectively. Based on the above-mentioned realization principle and implementation method, the influence of structure, coupling coefficient, external quality factor and Q value of varactor on the performance of tunable filter is analyzed. The frequency and bandwidth independent tunable filter based on U-type resonator is designed and implemented. The proposed tunable filter is processed and tested. The test results are in good agreement with the simulation results. Finally, the microstrip tunable filter with stable filtering performance is studied. Considering the influence of external quality factor, the external quality factor tuning circuit is introduced between the resonator and the input / output port. On the basis of this, a frequency and bandwidth adjustable filter based on SLR structure is designed, and the processing test of the proposed filter is carried out. The simulation results are in good agreement with the measured results, and the results show that the filter has small insertion loss. The filter performance is stable and the wide range tuning, especially the wide range tuning of the bandwidth, is realized. The absolute bandwidth is constant and the center frequency of the bandwidth adjustable process is constant in the process of frequency adjustment.
【學(xué)位授予單位】：西安電子科技大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：TN713

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本文編號：2445724