ISSN: 1673-825X    Imprint: Chongqing University of Posts and Telecommunications Journal
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Design of the period structure microstrip bandpass filter for 5G wireless communication applications
Received:May 16, 2018  Revised:April 09, 2019
中文关键词:周期性结构  低通滤波器  带通滤波器  微带线  加载金属过孔
英文关键词:period structure  lowpass filter  bandpass filter  microstrip line  loaded metallic vias
Author NameAffiliationE-mail
ZHENG Liping College of Optoelectronic and Communication Engineering, Yunnan Open University, Kunming 650500, P. R. China 
HE Ming College of Mechanical and Electrical Engineering, Yunnan Open University, Kunming 650500, P. R. China 
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      提出一种应用于5G无线通信的周期结构微带带通滤波器设计方法。在周期结构低通滤波器的矩形环中靠近电路中心一侧加载金属过孔,使其在截止频率附近发生谐振,以形成中心频率位于截止频率附近的带通滤波器。通过调整金属过孔的位置,实现带通滤波器带宽的控制,并且在矩形环偏离电路中心一侧连接矩形金属贴片,通过调整矩形金属贴片的尺寸可以适当调整滤波器的中心频率,而不改变滤波器的整体尺寸。实验测试结果表明,该滤波器的中心频率为3.33 GHz,3 dB相对带宽为6.9%。其带外抑制特性较好,具有较低的插损,适用于5G无线通信系统。
      In this paper, a design method of the periodic structure microstrip bandpass filter is presented for 5G wireless communication. The metallic vias is loaded in a rectangular loop near the center of the circuit of the period structure lowpass filter. Then, the resonance occurs near the cut-off frequency. The bandpass filter with a center frequency is formed. Moreover, the rectangular metal patch is connected to the side of far away the center of the rectangular loop, and the central frequency of the filter can be modified by adjusting the sizes of the rectangular metal patch. This modification, however, does not have any impact on the overall size of the filter. The measurement results show that the proposed bandpass filter with 3 dB relative bandwidth of 6.9% can be applied to 3.33 GHz. The filter is with better out-of-band rejection, and low insertion loss, exhibiting potentially use for the applications of 5G wireless communication systems.
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