A Novel Miniaturized Image Rejection Bandpass Filter Basing on Stepped-impedance Resonators

IF 0.7 Q4 ENGINEERING, ELECTRICAL & ELECTRONIC Progress in Electromagnetics Research Letters Pub Date : 2023-01-01 DOI:10.2528/pierl23063006

Guangxiu Zhao, Chen Li, Minquan Li, Pingjuan Zhang, Yajing Yan, Xiaming Mo, Ziyun Tu

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Abstract

|In order to meet the requirements for the suppression of mirror frequencies in the 5G RF front end, this paper proposes a novel miniaturized image rejection bandpass (cid:12)lter by loading Stepped-Impedance Resonators (SIR). By analyzing the relationship between the impedance ratio of a half-wavelength SIR and its electrical length, we have designed an improved second-order bandpass (cid:12)lter, which reduces the size by 34.3% compared to traditional (cid:12)ve-order hairpin (cid:12)lters. In order to further enhance the performance of the (cid:12)lter, the use of a radial stub, as opposed to the traditional rectangular open stub, allows for the generation of a wider band transmission zero, which can be analyzed using lumped equivalent circuits. This integration improves the stopband rejection of the (cid:12)lter. The results show that the passband range is 5.35 GHz{6.64 GHz; the rejection in the stopband range 8.10 GHz{ 11.98 GHz is over 45 dB; and the size is only 0.385 (cid:21) g (cid:2) 0 : 295 (cid:21) g .

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一种基于阶跃阻抗谐振器的小型阻像带通滤波器

为了满足5G射频前端对镜像频率抑制的要求，本文提出了一种新型的小型化阻像带通(cid:12)，该带通采用加载阶跃阻抗谐振器(SIR)。通过分析半波长SIR的阻抗比与其电长度之间的关系，我们设计了一种改进的二阶带通(cid:12)滤波器，与传统的五阶发夹(cid:12)滤波器相比，其尺寸减小了34.3%。为了进一步提高(cid:12)字母的性能，使用径向短根，而不是传统的矩形开路短根，允许产生更宽的带宽传输零，这可以使用集总等效电路进行分析。这种集成提高了(cid:12)字母的阻带抑制。结果表明:通带范围为5.35 GHz{6.64 GHz;阻带范围为8.10 GHz{11.98 GHz > 45 dB;尺寸仅为0.385 (cid:21) g (cid:2) 0: 295 (cid:21) g。

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来源期刊

Progress in Electromagnetics Research Letters ENGINEERING, ELECTRICAL & ELECTRONIC-

CiteScore

2.20

自引率

11.10%

发文量