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  本文選題：平衡帶通濾波器　切入點：基片集成波導　出處：《南京理工大學》2017年碩士論文

【摘要】：平衡濾波器因具有良好的環(huán)境噪聲抑制能力而被廣泛地應用于現(xiàn)代通信系統(tǒng)當中。此外,基片集成波導(Substrate Integrated Waveguide,SIW)技術(shù)作為一種新興的片上集成方案,因其在微波及毫米波波段具有損耗小和功率容量高的特點而備受關(guān)注。近年來,基于SIW結(jié)構(gòu)的平衡濾波器被提出并得到廣泛研究,但仍然存在尺寸過大的問題。為了實現(xiàn)小型化,基于半模結(jié)構(gòu)和多模結(jié)構(gòu)的SIW平衡濾波器被陸續(xù)提出。疊層技術(shù)作為以增加基片高度來換取面積小型化的有效方法,在多層微波電路設(shè)計中具有廣闊的應用前景。本文基于SIW疊層結(jié)構(gòu)提出了多種平衡濾波器的設(shè)計方案,所得到的濾波器結(jié)構(gòu)緊湊,在保證高選擇性、高共模抑制的前提下尺寸減少約50%。具體內(nèi)容包括:1.為了驗證疊層方案的可行性,本文首先設(shè)計了一款四階切比雪夫響應的平衡濾波器。其次,針對該濾波器選擇性不高的問題,通過引入交叉耦合路徑,實現(xiàn)了四階準橢圓濾波函數(shù)響應。因在通帶兩邊各引入一個傳輸零點,選擇性提高到254.1和206.2 dB/GHz。相較于同類型平衡濾波器,尺寸減小了 48.4%。2.提出了兩種SIW雙頻帶平衡濾波器的設(shè)計方法。首先,利用SIW矩形腔中的TE101和TE102模式分別構(gòu)建第一和第二通帶,然后通過分析兩個模式的磁場分布特點,在中間金屬層選擇合適的開槽位置,成功實現(xiàn)兩通帶耦合強度分別可調(diào)的目的。其次,針對共模抑制能力較差的問題,通過在底部進行開槽處理,改善了共模抑制性能。最后所得的平衡濾波器在雙通帶內(nèi)共模抑制優(yōu)于41 dB。相較于同類型平衡濾波器,尺寸減小了 50%以上。3.為了實現(xiàn)具有高共模抑制的雙頻帶平衡濾波器,采用端口異面分布結(jié)構(gòu),實現(xiàn)寬頻帶內(nèi)高共模抑制的特性。同時利用雙模SIW諧振器中不同模式之間的耦合,產(chǎn)生可控傳輸零點。所得濾波器在1-17 GHz帶寬內(nèi)共模抑制優(yōu)于47 dB,兩通帶隔離度優(yōu)于 45 dB。
[Abstract]:The balanced filter is widely used in modern communication systems because of its good environmental noise suppression ability.In addition, substrate Integrated waveguide siw technology, as a new on-chip integration scheme, has attracted much attention due to its low loss and high power capacity in microwave and millimeter wave bands.In recent years, the balanced filter based on SIW structure has been proposed and widely studied, but there still exists the problem of too large size.In order to realize miniaturization, SIW balanced filters based on half mode structure and multi mode structure have been proposed one after another.As an effective method to increase substrate height in exchange for area miniaturization, lamination technology has a broad application prospect in the design of multi-layer microwave circuits.In this paper, a variety of balanced filters are proposed based on the SIW stack structure. The obtained filters are compact in structure and reduce the size by about 50% under the premise of high selectivity and high common mode suppression.The details include: 1.In order to verify the feasibility of the laminated scheme, a fourth order Chebyshev response balanced filter is designed in this paper.Secondly, in order to solve the problem of low selectivity of the filter, the fourth order quasi-elliptic filter function response is realized by introducing the cross-coupling path.By introducing a transmission zero on each side of the passband, the selectivity is increased to 254.1 and 206.2 dB / GHz.Compared with the same type of balanced filter, the size of the filter is reduced by 48.4. 2.Two design methods of SIW dual band balanced filter are presented.First, the first and second pass bands are constructed by using the TE101 and TE102 modes in the SIW rectangular cavity, and then the appropriate slot position in the intermediate metal layer is selected by analyzing the magnetic field distribution characteristics of the two modes.The aim of adjusting the coupling strength of two pass bands is successfully realized.Secondly, aiming at the problem of poor common mode suppression ability, the common mode suppression performance is improved by slotting at the bottom.Finally, the balance filter is better than 41 dB in double pass band.Compared with the same type of balanced filter, the size of the filter is reduced by more than 50%.In order to realize the dual-band balanced filter with high common-mode suppression, the characteristic of high-common-mode suppression in wide band is realized by using the port hetero-plane distribution structure.At the same time, the controllable transmission zeros are generated by using the coupling between different modes in the dual-mode SIW resonator.The common mode suppression of the filter is better than 47 dB in 1-17 GHz bandwidth, and the isolation degree of the two pass band is better than 45 dB.
【學位授予單位】：南京理工大學
【學位級別】：碩士
【學位授予年份】：2017
【分類號】：TN713

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本文編號：1705065