下一代高速无线通信系统中的宽带射频滤波器的研究

发布时间：2018-07-14 17:55

【摘要】：近年来,以第五代(5G)移动通信系统为代表的高速无线通信系统受到广泛关注。作为无线通信系统的关键器件之一,滤波器性能的优劣会对整个系统的性能产生显著影响,因此它已成为毫米波领域的研究热点。基片集成波导(SIW)因为具有低插损、高品质因数,以及易于与平面电路集成的优点在滤波器设计中大量采用。因此,本文基于SIW技术,在三个5G通信系统备选频段以及太赫兹频段对滤波器进行了研究。主要工作如下:首先,在9-15GHz和25-30GHz两个5G通信系统备选频段,分别设计了小型宽带平面滤波器。为了克服传统SIW滤波器在较低频段尺寸大、带宽受限的缺点,本文设计的宽带滤波器使用平行耦合带状线作为主体结构,并且利用SIW将带状线结构封闭在中间层,显著降低了辐射损耗。滤波器采用了自封装的形式,具有低插损的特点。实验结果表明,滤波器性能良好。其次,Q波段也是5G通信系统备选频段之一。利用多层SIW技术,本文设计了一个Q波段的平面带通滤波器。带通滤波器由高通和低通滤波器级联形成,高通滤波器的设计利用了 SIW传输线的高通特性,而低通部分则由5个毫米波集总元件谐振单元级联形成。滤波器的中心频率为42.5GHz,相对带宽为11.76%。测试结果表明所设计的滤波器具有低插损、高抑制以及带宽易于调整的优点。该项工作已被Wiley,Microwave and Optical Technology Letters 录用,已经出版。最后,本文基于电磁带隙(EBG)结构在G波段设计了一个带通滤波器。利用周期性EBG结构的阻带特性,设计了一个截止频率为190GHz的低通滤波器,然后将它与利用SIW高通特性设计的截止频率为180GHz的高通滤波器进行级联,得到了通带范围为180-190GHz的带通滤波器。最后将所设计的滤波器与鳍线转接进行连接后,利用低成本的PCB工艺进行加工,对设计进行了验证。该项工作已投IET Electronic Letters,正在审稿中。
[Abstract]:In recent years, the fifth generation (5 G) mobile communication system, represented by high-speed wireless communication system, has received wide attention. As one of the key devices in wireless communication systems, the performance of the filter will have a significant impact on the performance of the whole system, so it has become a research hotspot in the field of millimeter wave. Substrate integrated waveguide (SIW) is widely used in filter design because of its advantages of low insertion loss, high quality factor and easy integration with planar circuits. Therefore, based on SIW technology, the filter is studied in three alternative frequency bands of 5G communication system and terahertz band. The main work is as follows: firstly, small wideband planar filters are designed in the alternative frequency bands of 9-15GHz and 25-30GHz. In order to overcome the disadvantages of the traditional SIW filter with large size and limited bandwidth in the lower frequency band, the broadband filter designed in this paper uses parallel coupled banded lines as the main structure, and uses SIW to seal the banded line structure in the middle layer. The radiation loss is significantly reduced. The filter adopts the form of self-encapsulation and has the characteristic of low insertion loss. The experimental results show that the filter has good performance. Secondly, Q band is also one of the alternative frequency bands of 5 G communication system. Using multilayer SIW technique, a Q band planar bandpass filter is designed in this paper. The bandpass filter is formed by cascading high pass filter and low pass filter. The design of high pass filter utilizes the high pass characteristic of SIW transmission line, while the low pass part is formed by 5 millimeter wave lumped element resonant unit cascaded. The center frequency of the filter is 42.5 GHz and the relative bandwidth is 11.76 GHz. The test results show that the designed filter has the advantages of low insertion loss, high suppression and easy bandwidth adjustment. The job has been hired by Wileyn Microwave and Optical Technology Letters and published. Finally, a bandpass filter is designed in G band based on the electromagnetic band gap (EBG) structure. Based on the stopband characteristic of the periodic EBG structure, a low-pass filter with a cut-off frequency of 190GHz is designed and cascaded with a high-pass filter with a cut-off frequency of 180GHz designed by using the SIW high-pass characteristic. Bandpass filters with a passband range of 180-190 GHz have been obtained. Finally, the designed filter is connected to the fin line, and the design is verified by using the low cost PCB process. This work has been submitted to IET Electronic Letters and is under review.
【学位授予单位】：东南大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TN713

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