New negative coupling structure and its application on substrate integrated waveguide bandpass filters
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摘要: 针对高性能交叉耦合基片集成波导带通滤波器的应用，提出一种新型负耦合结构，该耦合结构由两个短路耦合线设计实现，并详细分析了其特性，能够实现较弱或较强的负耦合。总结了基于特征多项式的耦合矩阵综合优化方法，并通过两个滤波器的设计进行说明。基于综合得到的两个耦合矩阵，设计了两个中心频率为10 GHz的四阶交叉耦合基片集成波导带通滤波器，第一个滤波器的归一化相对带宽为3%，负耦合结构提供交叉耦合，用于说明该耦合结构提供相对较弱的耦合强度；第二个滤波器的相对带宽为8%，负耦合结构提供主耦合，用于说明该耦合结构提供较强的负耦合强度。为了验证滤波器的实际性能，对这两款滤波器进行了加工和测试。测试和仿真结果一致性较好，表明了该负耦合结构用于高性能交叉耦合基片集成波导滤波器设计的可行性。最后讨论了弱色散交叉耦合对传输零点位置的影响。Abstract: To design cross-coupled substrate integrated waveguide (SIW) bandpass filters (BPFs) with high performance, a new negative coupling structure is proposed, which is constructed by two coupled lines with shorted ends. The negative coupling structure is analyzed in detail. The stracture which can realize both relatively weak and strong negative coupling strength. The optimization method based on characteristic polynomials and reference zeros and poles of scattering parameters is realized for the filter design. To verify the proposed negative coupling structure, two fourth-order cross-coupled SIW BPFs with the center frequency of 10 GHz based on the optimized coupling matrixes are designed. The first one has a normalized bandwidth of 3% with a negative coupling in one cross-coupling path to illustrate the realization of weak negative coupling strength, and the second one has a normalized bandwidth of 8% with a negative coupling in one main coupling path to illustrate the realization of strong negative coupling strength. Finally, the two BPFs are fabricated and measured. Simulation and measurement results are in good agreement, which demonstrates the feasibility of the proposed negative coupling structure and its application on cross-coupled SIW filters with high performance. The influence of weak disperse cross coupling on locations of transmission zeros is also discussed.
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图 2 两个谐振器相耦合的电场分布
Figure 2. Electric-field distributions of the two coupled SIW cavities
图 3 提取的耦合系数及归一化变换器K/Z0
Figure 3. Extracted coupling coefficient and normalized inverter K/Z0
图 5 滤波器I的结构示意图、仿真、测试结果
Figure 5. Structure, simulated and measured data of the proposed filter I
图 6 滤波器II的结构示意图、仿真、测试结果
Figure 6. Structure, simulated and measured data of the proposed filter II
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[1] Moscato S, Tomassoni C, Bozzi M, et al. Quarter-mode cavity filters in substrate integrated waveguide technology[J]. IEEE Trans Microwave Theory & Techniques, 2016, 64(8): 2538-2547. [2] 翟国华, 洪伟, 吴柯, 等. 集成宽带折叠半模基片集成波导带通滤波器[J]. 电子学报, 2010, 38(4):825-829. (Zhai Guohua, Hong Wei, Wu Ke, et al. Compact wideband folded half mode substrate integrated waveguide bandpass filters. Acta Electronica Sinica, 2010, 38(4): 825-829 [3] 李荣强, 肖绍球. 一种槽线扰动的基片集成波导双模滤波器[J]. 电子与信息学报, 2014, 36(11):2791-2794. (Li Rongqiang, Xiao Shaoqiu. A substrate integrated waveguide dual-mode filter with a slot line perturbation. Journal of Electronics & Information Technology, 2014, 36(11): 2791-2794 [4] 刘庆, 周东方, 张德伟, 等. 双/三模基片集成波导和共面波导混合结构滤波器设计[J]. 电子学报, 2018, 46(4):952-960. (Liu Qing, Zhou Dongfang, Zhang Dewei, et al. Design of filters using hybrid structure of dual/triple-mode substrate integrated waveguide and ground coplanar waveguides. Acta Electronica Sinica, 2018, 46(4): 952-960 doi: 10.3969/j.issn.0372-2112.2018.04.025 [5] Liu Q, Zhou D, Wang S, et al. Highly-selective pseudoelliptic filters based on dual-mode substrate integrated waveguide resonators[J]. Electronics Letters, 2016, 52(14): 1233-1235. doi: 10.1049/el.2016.1517 [6] Chu P, Hong W, Tuo M G, et al. Dual-mode substrate integrated waveguide filter with flexible response[J]. IEEE Trans Microwave Theory & Techniques, 2017, 63(3): 1-7. [7] Liu Z, Xiao G, Zhu L. Triple-mode bandpass filters on CSRR-loaded substrate integrated waveguide cavities[J]. IEEE Trans Components Packaging & Manufacturing Technology, 2016, 6(7): 1-7. [8] Chu P, Hong W, Tuo M, et al. Dual-mode substrate integrated waveguide filter with flexible response[J]. IEEE Trans Microwave Theory & Techniques, 2017, 65(3): 824-830. [9] Deslandes D, Wu K. Single-substrate integration technique of planar circuits and waveguide filters[J]. IEEE Trans Microwave Theory & Techniques, 2003, 51(2): 593-596. [10] Liu Q, Zhou D, Lü D, et al. Ultra-compact highly selective quasi-elliptic filters based on combining dual-mode SIW and coplanar waveguides in a single cavity[J]. IET Microwaves Antennas & Propagation, 2018, 12(3): 360-366. [11] Cameron R J, Kudsia C M, Mansour R R. Microwave filters for communication systems: Fundamentals, design, and applications[M]. New York: Wiley, 2007. [12] Chang C Y, Hsu W C. Novel planar, square-shaped, dielectric-waveguide, single-, and dual-mode filters[J]. IEEE Trans Microwave Theory & Techniques, 2002, 50(11): 2527-2536. [13] Chen X P, Wu K. Substrate integrated waveguide cross-coupled filter with negative coupling structure[J]. IEEE Trans Microwave Theory & Techniques, 2008, 56(1): 142-149. [14] Potelon B, Favennec J F, Quendo C, et al. Design of a substrate integrated waveguide (SIW) filter using a novel topology of coupling[J]. IEEE Microwave & Wireless Components Letters, 2008, 18(9): 596-598. [15] You C J, Chen Z N, Zhu X W, et al. Single-layered SIW post-loaded electric coupling-enhanced structure and its filter applications[J]. IEEE Trans Microwave Theory & Techniques, 2013, 61(1): 125-130. [16] Amari S. Synthesis of cross-coupled resonator filters using an analytical gradient-based optimization technique[J]. IEEE Trans Microwave Theory & Techniques, 2000, 48(9): 1559-1564. [17] Lamecki A, Kozakowski P, Mrozowski M. Fast synthesis of coupled-resonator filters[J]. IEEE Microwave & Wireless Components Letters, 2004, 14(4): 174-176. [18] Kozakowski P, Lamecki A, Sypek P, et al. Eigenvalue approach to synthesis of prototype filters with source/load coupling[J]. IEEE Microwave & Wireless Components Letters, 2005, 15(2): 98-100. [19] Szydlowski L, Lamecki A, Mrozowski M. Coupled-resonator filters with frequency-dependent couplings: coupling matrix synthesis[J]. IEEE Microwave & Wireless Components Letters, 2012, 22(6): 312-314. [20] Szydlowski L, Lamecki A, Mrozowski M. Coupled-resonator waveguide filter in quadruplet topology with frequency-dependent coupling – A design based on coupling matrix[J]. IEEE Microwave & Wireless Components Letters, 2012, 22(11): 553-555. [21] Amari S, Bekheit M, Seyfert F. Notes on bandpass filters whose inter-resonator coupling coefficients are linear functions of frequency[C]// IEEE MTT-S International Microwave Symposium Digest. 2008: 1207-1210. -
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