【摘要】：可重構(gòu)通信系統(tǒng)作為未來通信系統(tǒng)的發(fā)展方向,越來越受到關(guān)注,作為可重構(gòu)系統(tǒng)關(guān)鍵器件之一的可調(diào)射頻濾波器也越來越受到重視。本文從理論分析到實(shí)際設(shè)計(jì)對(duì)可調(diào)濾波器展開了相關(guān)研究。首先,本文分析了經(jīng)典濾波器設(shè)計(jì)中P(s)、F(s)和E(s)多項(xiàng)式系數(shù)提取到耦合矩陣綜合的過程,然后結(jié)合可調(diào)濾波器自身的特點(diǎn),計(jì)算了耦合矩陣在濾波器調(diào)諧過程中各個(gè)設(shè)計(jì)參數(shù)所需要滿足的條件。提出通過經(jīng)典的不可調(diào)濾波器加載調(diào)諧元件構(gòu)成可調(diào)濾波器的設(shè)計(jì)流程,并從理論層面論述了其可行性及實(shí)施條件�；谶@一設(shè)計(jì)理論,本文設(shè)計(jì)實(shí)現(xiàn)了多款可調(diào)濾波器,包括可調(diào)微帶濾波器和在國內(nèi)外文獻(xiàn)中較少見的可調(diào)腔體濾波器。本文設(shè)計(jì)實(shí)現(xiàn)了一款微帶結(jié)構(gòu)的雙通帶雙模濾波器。雙通帶中心頻率分別為2.35GHz/3.35GHz。詳細(xì)分析計(jì)算了所設(shè)計(jì)的SLR特性及其構(gòu)成濾波器的設(shè)計(jì)流程。測試結(jié)果符合預(yù)期。在此基礎(chǔ)上,通過加載變?nèi)荻䴓O管設(shè)計(jì)實(shí)現(xiàn)了一款微帶結(jié)構(gòu)的雙通帶三�？烧{(diào)射頻濾波器。雙通帶中心頻率分別在0.8~1.02GHz/2.02~2.48GHz可調(diào)。該濾波器采用了具有獨(dú)創(chuàng)性的“T”型加載枝節(jié),使可調(diào)濾波器所需的控制電壓減少一半。該濾波器通過N+2階耦合擴(kuò)展,實(shí)現(xiàn)了6個(gè)傳輸零點(diǎn),提高了可調(diào)濾波器的選擇性。該濾波器與國內(nèi)外同類濾波器相比具有調(diào)諧簡便,選擇性好等特點(diǎn)。腔體電可調(diào)濾波器是目前可調(diào)濾波器的難點(diǎn),本文提出了一種可調(diào)SIW濾波器,推導(dǎo)了SIW諧振器加載調(diào)諧元件構(gòu)成可調(diào)諧振器的原理。并基于此設(shè)計(jì)實(shí)現(xiàn)了一款可調(diào)SIW濾波器,測試結(jié)果證明該設(shè)計(jì)可以通過加載控制電壓,控制濾波器的中心頻率及外部Q值。這一濾波器的設(shè)計(jì)實(shí)現(xiàn)有助于進(jìn)一步推動(dòng)腔體電可調(diào)濾波器的研究和發(fā)展。
[Abstract]:As the development direction of the future communication system, reconfigurable communication system has attracted more and more attention. As one of the key components of the reconfigurable system, the tunable RF filter has been paid more and more attention. In this paper, the tunable filter is studied from theoretical analysis to practical design. Firstly, this paper analyzes the process of extracting the coefficients of P (s), F (s) and E (s) polynomials to the coupling matrix synthesis in the classical filter design, and then combines the characteristics of the tunable filter itself. The conditions required for the design parameters of the coupling matrix in the filter tuning process are calculated. The design flow of tunable filter based on the classical tunable filter loaded with tunable elements is presented. The feasibility and implementation conditions of the tunable filter are discussed theoretically. Based on this design theory, several tunable filters are designed and implemented, including tunable microstrip filters and tunable cavity filters, which are rare in domestic and foreign literatures. In this paper, a dual pass band double mode filter with microstrip structure is designed and implemented. The central frequency of double pass band is 2.35 GHz / 3.35 GHz. The SLR characteristics and the design flow of the filter are analyzed and calculated in detail. The test results were in line with expectations. On this basis, a dual-pass three-mode tunable RF filter with microstrip structure is designed by loading varactor diode. The center frequency of double pass band is adjustable in 0.8~1.02GHz/2.02~2.48GHz. In this filter, the original "T" loading section is used to reduce the control voltage required by the adjustable filter in half. The filter achieves six transmission zeros by N _ 2 coupling expansion and improves the selectivity of the tunable filter. Compared with similar filters at home and abroad, this filter has the advantages of simple tuning and good selectivity. Cavity electrically tunable filter is a difficult problem for tunable filters at present. A tunable SIW filter is proposed in this paper. The principle of tunable resonator with tunable elements loaded by SIW resonator is deduced. An adjustable SIW filter is implemented based on this design. The test results show that the design can control the center frequency and the external Q value of the filter by loading the control voltage. The design and implementation of this filter is helpful to further promote the research and development of cavity electrically tunable filter.
【學(xué)位授予單位】：杭州電子科技大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類號(hào)】：TN713

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