基于叠层基片集成波导结构的平衡滤波器小型化设计

发布时间：2018-04-03 11:43

本文选题：平衡带通滤波器　切入点：基片集成波导　出处：《南京理工大学》2017年硕士论文

【摘要】：平衡滤波器因具有良好的环境噪声抑制能力而被广泛地应用于现代通信系统当中。此外,基片集成波导(Substrate Integrated Waveguide,SIW)技术作为一种新兴的片上集成方案,因其在微波及毫米波波段具有损耗小和功率容量高的特点而备受关注。近年来,基于SIW结构的平衡滤波器被提出并得到广泛研究,但仍然存在尺寸过大的问题。为了实现小型化,基于半模结构和多模结构的SIW平衡滤波器被陆续提出。叠层技术作为以增加基片高度来换取面积小型化的有效方法,在多层微波电路设计中具有广阔的应用前景。本文基于SIW叠层结构提出了多种平衡滤波器的设计方案,所得到的滤波器结构紧凑,在保证高选择性、高共模抑制的前提下尺寸减少约50%。具体内容包括:1.为了验证叠层方案的可行性,本文首先设计了一款四阶切比雪夫响应的平衡滤波器。其次,针对该滤波器选择性不高的问题,通过引入交叉耦合路径,实现了四阶准椭圆滤波函数响应。因在通带两边各引入一个传输零点,选择性提高到254.1和206.2 dB/GHz。相较于同类型平衡滤波器,尺寸减小了 48.4%。2.提出了两种SIW双频带平衡滤波器的设计方法。首先,利用SIW矩形腔中的TE101和TE102模式分别构建第一和第二通带,然后通过分析两个模式的磁场分布特点,在中间金属层选择合适的开槽位置,成功实现两通带耦合强度分别可调的目的。其次,针对共模抑制能力较差的问题,通过在底部进行开槽处理,改善了共模抑制性能。最后所得的平衡滤波器在双通带内共模抑制优于41 dB。相较于同类型平衡滤波器,尺寸减小了 50%以上。3.为了实现具有高共模抑制的双频带平衡滤波器,采用端口异面分布结构,实现宽频带内高共模抑制的特性。同时利用双模SIW谐振器中不同模式之间的耦合,产生可控传输零点。所得滤波器在1-17 GHz带宽内共模抑制优于47 dB,两通带隔离度优于 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.
【学位授予单位】：南京理工大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TN713

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