【摘要】：隨著當(dāng)前無線通信的快速發(fā)展、通信傳遞方式的多樣化,對整個通信系統(tǒng)提出了諸如高集成、小型化、低成本等一系列要求,而微波濾波器作為通信系統(tǒng)中的關(guān)鍵器件,對整個通信系統(tǒng)有著重大影響�；刹▽�(dǎo)(Substrate Integrated Waveguide,SIW)具有傳統(tǒng)金屬波導(dǎo)的高品質(zhì)因數(shù)、高功率容量等優(yōu)點,同時具備微帶結(jié)構(gòu)的體積小、易集成等優(yōu)點,因而在微波系統(tǒng)中得到廣泛應(yīng)用。基片集成波導(dǎo)技術(shù)可以通過諧振腔方式在平面電路中集成濾波的功能,從而實現(xiàn)濾波器的集成化與小型化;而交叉耦合技術(shù)可以通過引入有限的傳輸零點來提高濾波器的帶外抑制,進(jìn)一步提高濾波器的選擇特性。基于上述考慮,本文立足于基片集成波導(dǎo)諧振腔的濾波特性,結(jié)合交叉耦合方式,針對高選擇性的濾波器結(jié)構(gòu)進(jìn)行了研究和設(shè)計。1、從濾波器設(shè)計的原理出發(fā),介紹了微波濾波器的基本理論以及濾波器的性能指標(biāo),給出了一般濾波器的設(shè)計方法。2、在研究了基片集成波導(dǎo)、基片集成同軸線的傳輸特性基礎(chǔ)上,利用矩形腔體設(shè)計了單層兩腔、四腔體濾波器并給出了仿真結(jié)果。3、重點研究了交叉耦合的技術(shù)原理,在此基礎(chǔ)上設(shè)計出應(yīng)用基片集成波導(dǎo)技術(shù)的交叉耦合腔體濾波器,通過引入傳輸零點,提高了濾波器的頻率選擇性能。4、在單層交叉耦合結(jié)構(gòu)的基礎(chǔ)上設(shè)計了雙層結(jié)構(gòu)的交叉耦合濾波器,通過引入傳輸零點,改善濾波器的帶外抑制能力。5、設(shè)計了一款中心頻率為15GHz的過模腔體濾波器,選擇合適的饋電端口位使濾波器的上下阻帶各產(chǎn)生一個傳輸零點,有效地改善濾波器的頻率選擇以及阻帶的抑制性。6、設(shè)計了基于高次模的Q波段基片集成波導(dǎo)濾波器,降低了高頻率段器件加工難度。同時設(shè)計了基于六邊形諧振腔的高次模濾波器,采用雙層結(jié)構(gòu),利用交叉耦合產(chǎn)生傳輸零點。在傳統(tǒng)微帶饋電的基礎(chǔ)上,使用基片集成同軸線對濾波器進(jìn)行饋電,在上下層分別構(gòu)成兩個腔體,形成兩條傳輸路徑產(chǎn)生傳輸零點,改善濾波器選擇性。
[Abstract]:With the rapid development of wireless communication and the diversification of communication transmission methods, a series of requirements such as high integration, miniaturization and low cost are put forward for the whole communication system. Microwave filter is the key device in the communication system. It has a great influence on the whole communication system. Substrate integrated waveguide (Substrate Integrated Waveguide,SIW) is widely used in microwave systems because of its advantages of high quality factor, high power capacity, small size of microstrip structure, easy integration and so on. The technique of substrate integrated waveguide can integrate the function of filter in planar circuit by resonant cavity mode, so as to realize the integration and miniaturization of filter. The cross-coupling technique can improve the out-of-band suppression of the filter by introducing the limited transmission zeros, and further improve the selection characteristics of the filter. Based on the above considerations, based on the filter characteristics of the substrate integrated waveguide resonator, combined with the cross-coupling mode, the structure of the filter with high selectivity is studied and designed. 1, starting from the principle of filter design, The basic theory and performance index of microwave filter are introduced, and the design method of general filter is given. 2. On the basis of studying the transmission characteristics of substrate integrated waveguide and substrate integrated coaxial line, The single-layer two-cavity and four-cavity filters are designed by using rectangular cavity and the simulation results are given. 3. The principle of cross-coupling is mainly studied. On this basis a cross-coupling cavity filter based on substrate integrated waveguide technology is designed. The frequency selection performance of the filter is improved by introducing transmission zeros. 4. Based on the single-layer cross-coupling structure, a double-layer cross-coupled filter is designed, and the transmission zero is introduced. To improve the out-of-band rejection ability of the filter, an over-mode cavity filter with the center frequency of 15GHz is designed, and the appropriate feed port position is selected to produce a transmission zero for the upper and lower stop bands of the filter. 6. A Q-band substrate integrated waveguide filter based on high-order mode is designed, which reduces the processing difficulty of high-frequency device. At the same time, a high-order mode filter based on hexagonal resonator is designed, which adopts a double-layer structure and uses cross-coupling to generate transmission zeros. On the basis of the traditional microstrip feed, the filter is fed by the substrate integrated coaxial line, and two cavities are formed in the upper and lower layers respectively, forming two transmission paths to produce transmission zeros and improving the selectivity of the filter.
【學(xué)位授予單位】：南京航空航天大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：TN713

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