小型化超宽带滤波器和功分器设计

发布时间：2018-05-07 17:46

本文选题：超宽带 + 带通滤波器　；参考：《中国科学技术大学》2015年硕士论文

【摘要】：超宽带(UWB)通信因其更高的传输速率,在现代无线通信领域被广泛使用。通信系统的高集成化发展,对射频模块的无源器件提出了更高的要求,即高性能、小型化以及低造价。本文主要对射频电路无源器件中的带通滤波器以及功分器进行小型化和高性能设计,并在此基础上对其进一步实现通带内阻带的加载。本文首先讨论不同的滤波器低通原型,比较其滤波性能,采用更有利于实现高选择性、良好的带内带外性能的原型。在此基础上提出一种折叠结构,实现比现有滤波器更小型化的高性能UWB滤波器。为进一步对滤波器小型化,本文还提出新的滤波器结构,并且利用电磁带隙结构改进其高频性能。在对功分器的研究中,首先找出传统功分器限制带宽的因素,进而加以改进,使其具有超宽带以及滤波性能。具体通过采用谐振结构代替其中的单节四分之一阻抗匹配器并加载平行耦合微带线结构来实现。为了解决频段冲突,避免与其它应用的信号相互干扰,本文对滤波器和功分器通带内的阻带加载进行研究。本文采用耦合型谐振器在带通滤波器的通带内加载阻带,实现在加载阻带性能良好同时保持超宽带滤波器良好的滤波以及带外抑制性能。不同于现有开槽加载阻带结构,本文也采用在多模谐振结构上开Hilbert分形槽的方法来进行阻带的加载。本文还提出一种新型结构滤波器即干扰型结构,通过对尺寸的调节在通带内产生零点,实现阻带加载。类似于超宽带滤波器的阻带加载技术,本文采用同样的耦合型谐振器,实现具有良好通带选择性的功分器的阻带加载。
[Abstract]:Ultra-wideband (UWB) communication is widely used in modern wireless communication due to its high transmission rate. With the development of high integration of communication system, the passive devices of RF module are required, that is, high performance, miniaturization and low cost. In this paper, the bandpass filter and power divider in the passive RF circuit are designed for miniaturization and high performance, and on this basis, the loading of the passband internal stopband is further realized. In this paper, we first discuss different low-pass prototypes of filters, compare their filtering performance, and adopt prototypes with high selectivity and good in-band and out-of-band performance. On the basis of this, a folding structure is proposed to realize the high performance UWB filter which is smaller than the existing filter. In order to further miniaturize the filter, a new filter structure is proposed, and the electromagnetic bandgap structure is used to improve its high frequency performance. In the study of the power divider, the factors that limit the bandwidth of the traditional power divider are first found out, and then improved to make it have ultra-wideband and filtering performance. The resonant structure is used instead of the single section 1/4 impedance matcher and the parallel coupled microstrip line structure is loaded. In order to solve the frequency band conflict and avoid interference with other applications, the stopband loading in the passband of filter and power divider is studied in this paper. In this paper, the coupling resonator is used to load the stopband in the passband of the band-pass filter. Different from the existing slot-loaded stopband structure, this paper also uses the Hilbert fractal slot method to load the stopband on the multi-mode resonant structure. In this paper, a new type of filter called interference structure is proposed, which produces zero point in the passband by adjusting the size of the filter, and realizes the stopband loading. Similar to the stopband loading technique of UWB filter, the same coupling resonator is used to realize the stopband loading of the power divider with good passband selectivity.
【学位授予单位】：中国科学技术大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TN713;TN626

【相似文献】