Dhakal Rajendra, Kim Nam-Young
RFIC Lab, Department of Electronics Engineering, Kwangwoon University, Nowon-gu, Seoul 139-701, Republic of Korea.
ScientificWorldJournal. 2013 Nov 11;2013:457693. doi: 10.1155/2013/457693. eCollection 2013.
This paper presents a symmetric-type microstrip triple-band bandstop filter incorporating a tri-section meandered-line stepped impedance resonator (SIR). The length of each section of the meandered line is 0.16, 0.15, and 0.83 times the guided wavelength (λ g ), so that the filter features three stop bands at 2.59 GHz, 6.88 GHz, and 10.67 GHz, respectively. Two symmetric SIRs are employed with a microstrip transmission line to obtain wide bandwidths of 1.12, 1.34, and 0.89 GHz at the corresponding stop bands. Furthermore, an equivalent circuit model of the proposed filter is developed, and the model matches the electromagnetic simulations well. The return losses of the fabricated filter are measured to be -29.90 dB, -28.29 dB, and -26.66 dB while the insertion losses are 0.40 dB, 0.90 dB, and 1.10 dB at the respective stop bands. A drastic reduction in the size of the filter was achieved by using a simplified architecture based on a meandered-line SIR.
本文提出了一种采用三段曲折线阶梯阻抗谐振器（SIR）的对称型微带三频段带阻滤波器。曲折线各段的长度分别为导波波长（λg）的0.16、0.15和0.83倍，使得该滤波器分别在2.59 GHz、6.88 GHz和10.67 GHz处具有三个阻带。采用两个对称的SIR与一条微带传输线，以在相应阻带处获得1.12 GHz、1.34 GHz和0.89 GHz的宽带宽。此外，还建立了所提出滤波器的等效电路模型，该模型与电磁仿真结果匹配良好。所制作滤波器在各阻带处的回波损耗测量值分别为-29.90 dB、-28.29 dB和-26.66 dB，而插入损耗分别为0.40 dB、0.90 dB和1.10 dB。通过使用基于曲折线SIR的简化架构，实现了滤波器尺寸的大幅减小。
