Design of dual-band bandpass filter based on novel quad-mode resonator
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摘要: 提出了一种新型的基于双枝节加载的T型四模谐振器，并且利用该谐振器设计了一款双模双通带带通滤波器。首先利用奇偶模分析法以及场分布分析法对四模谐振器的频率特性进行分析，谐振器的每一个谐振模式均可以被独立调节。然后对馈线枝节的参数进行了详细的分析，得到馈线对滤波器外部耦合系数的影响，以调整滤波器通带的带通宽度。接着分析滤波器传输零点产生的原因，得到零点变化的规律，从而调整零点位置，提高滤波器的选择性。缺陷地结构(DGS)被蚀刻在滤波器的金属层底面，以引入非谐振节点，提供源与负载的耦合，可以产生额外的传输零点，进一步提高滤波器的选择性，而且不会增大滤波器的体积。对该滤波器进行加工和测试，仿真结果与测试结果基本吻合。Abstract: In this paper, a novel dual-mode dual-band bandpass filter using a quad-mode dual-stub loaded T-type resonator is proposed. The quad-mode resonator is analyzed using odd-/even-mode method. Field distribution of each mode is illustrated, and each mode can be independently controlled. The required extra quality factor (Qe) can be realized by determining the proper feed-lines parameters, and detail analysis is provided to adjust bandwidth of filter passbands. Then the cause of the zero point of the filter transmission is analyzed get the rule of the zero point change is got for adjusting the zero position and improving the selectivity of the filter. defected ground structure (DGS), etched on the bottom metal surface of the filter, working as a non-resonant node (NRN) and proving source-to-load coupling, are utilized to introduce extra transmission zero to improve the passband selectivity without increasing filter volume. The filter was designed and fabricated, and the simulated results are in accordance with the measured results.
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图 1 (a) 四模谐振器的结构, (b)偶模等效电路, (c)奇模等效电路
Figure 1. Structure and equivalent circuits of quad-mode resonator (QMR)
图 2 (a) feve1的场分布; (b) fodd1的场分布; (c) feve2的场分布; (d) fodd2的场分布
Figure 2. Field distribution of four resonating modes
图 7 传输零点随参数的变化
Figure 7. Variation of the transmission zeros (TZs) with varied parameters
图 8 蚀刻DGS与不蚀刻DGS的对比
Figure 8. Comparison of filter response with defected ground structure (DGS) and without DGS
图 10 (a) 滤波器的实物，(b)测试结果与仿真结果的对比
Figure 10. The filter fabricated and comparison between simulated and measured results
表 1 低频通带的耦合矩阵
Table 1. Coupling matrix of low frequency passband
M S 1 2 L S 0 0.022 0.026 0 1 0.022 0.047 0 -0.022 2 0.026 0 -0.045 0.026 L 0 -0.022 0.026 0 
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表 2 高频通带的耦合矩阵
Table 2. Coupling matrix of high frequency passband
M S 3 4 L S 0 0.019 0.036 0 3 0.019 0.051 0 -0.019 4 0.036 0 -0.045 0.036 L 0 -0.019 0.036 0
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表 3 NRN的耦合矩阵
Table 3. Coupling matrix of non-resonant node (NRN)
M S 3 N L S 0 0.895 2 1.112 4 0 3 0.895 2 0.187 3 1.211 5 -0.895 2 N 1.112 4 1.211 5 -19.772 -1.112 4 L 0 -0.895 2 -1.112 4 0
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