带抽头的微带交指滤波器初始设计流程

文数文; 高杨; 许夏茜

doi:10.11884/HPLPB201830.180007

带抽头的微带交指滤波器初始设计流程

doi: 10.11884/HPLPB201830.180007

文数文^1,,
高杨^{2, 3, ,},
许夏茜¹

1.
西南科技大学信息工程学院, 四川绵阳 621010
2.
中国工程物理研究院电子工程研究所, 四川绵阳 621999
3.
中国科学院高能物理研究所核探测与核电子学国家重点实验室, 北京 100049

基金项目:

国家自然科学基金项目 61574131

核探测与核电子学国家重点实验室开放课题基金项目 2016KF-02

四川省重点实验室开放基金项目 14ZXTK01

详细信息

作者简介:
文数文(1992－)，男，硕士研究生，从事微电子机械系统研究；505672577@qq.com

通讯作者:
高杨(1972－)，男，博士，研究员，从事微电子机械系统研究；gaoyang@caep.cn

中图分类号: TN631.2
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- 被引次数: 0
出版历程
- 收稿日期: 2018-01-08
- 修回日期: 2018-03-09
- 刊出日期: 2018-07-15

Initial design procedure of microstrip interdigital filter with tapped-line

Wen Shuwen^1
,,
Gao Yang^{2, 3
, ,},
Xu Xiaqian¹

1.
School of Information Engineering, Southwest University of Science and Technology, Mianyang 621010, China
2.
Institute of Electronic Engineering, CAEP, Mianyang 621999, China
3.
State Key Laboratory of Particle Detection and Electronics, Institute of High Energy Physics, Chinese Academy of Sciences, Beijing 100049, China

摘要

摘要: 带抽头的微带交指滤波器初始设计方法繁多，但设计不够全面、简洁，同时精度不高，因此给出了一套详细、简洁的初始设计流程。设计步骤为：指标“规范化”，确定低通原型滤波器，求解滤波器阶数，求解归一化电导值，设计抽头的线长和线宽，设计谐振器的线宽，设计非输入输出谐振器的线长，设计相邻谐振器间距，设计输入输出谐振器的线长和抽头的位置，交指滤波器整体建模仿真。最后以Ka波段滤波器为案例进行初始设计，初始设计结果显示中心频率在30.19 GHz附近，通带比29.40~31.00 GHz略大，通带内最大插入损耗为4.22 dB，最小回波损耗为9.32 dB，27.00 GHz和33.40 GHz的带外抑制大于30.00 dB，已经基本满足设计指标，后续只需要稍加优化就能完全满足设计指标，验证了此套设计流程的可行性及其较高的精度。
- 微电子机械系统 /
- 交指滤波器 /
- 微带线 /
- 抽头线
Abstract: There are many initial design methods for microstrip interdigital filter with tapped-line but the design methods are not complate, concise and accurate enough, so a set of initial design flow with completeness and conciseness is given. The design steps are as follows: index "standardization", determine the low-pass prototype filter, determine the order of the filter, determine the normalized conductance value, design tapped line length and width, design resonator width, design non-input/output resonator length, design adjacent resonator spacing, design input/output resonator length and tapped line position, integral modeling and simulation of interdigital filter. Finally, taking the initial design of Ka-band filter as an example, the initial design results show that the center frequency is about 30.19 GHz, the passband range is slightly larger than 29.40-31.00 GHz, the maximum insertion loss is 4.21 dB, the minimum return loss is 9.35 dB, the stopband rejection of 27.00 GHz and 33.40 GHz is more than 30.00 dB, which basically meet the design indexes, only a little optimization is needed to fully meet the design indexes, and the feasibility and high accuracy of the design flow are verified.
- MEMS /
- interdigital filter /
- microstrip line /
- tapped-line

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图 1 带抽头的微带交指滤波器一般模型

Figure 1. General configuration of interdigital filter with tapped-line

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图 2 带抽头的微带交指滤波器初始设计流程

Figure 2. Initial design procedure of interdigital filter with tapped-line

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图 3 单个谐振器建模

Figure 3. Modeling of single resonator

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图 4 单个谐振器的S₁₁曲线

Figure 4. S₁₁of single resonator

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图 5 两个谐振器对称耦合建模

Figure 5. Modeling of symmetric coupling of two resonators

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图 6 两个对称耦合谐振器的S参数曲线

Figure 6. S parameter of two symmetrically coupled resonators

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图 7 输入/输出谐振器建模

Figure 7. Modeling of input/output resonators

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图 8 输入/输出谐振器的群时延

Figure 8. Group delay of input/output resonators

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图 9 交指滤波器建模

Figure 9. Integral modeling of interdigital filter

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图 10 交指滤波器S参数曲线

Figure 10. S parameter of interdigital filter

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图 11 HFSS交指滤波器优化结果

Figure 11. Optimization result diagram of entirety filter in HFSS

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表 1 滤波器设计指标

Table 1. Design specification of the filter

center frequency /GHz	passband frequency range/GHz	passband ripple /dB	insertion loss /dB	return loss /dB	stop rejection /dB
30.19	29.4~31	1	2~3	17.7	≥30@27 GHz&33.4 GHz

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表 2 切比雪夫原型滤波器归一化电导值

Table 2. Normalized conductance value of the Chebyshev prototype filter

n	g₀	g₁	g₂	g₃	g₄	g₅	g₆
5	1	0.971 4	1.372 1	1.801 4	1.372 1	0.971 4	1

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表 3 耦合系数m，k与谐振器间距s

Table 3. Coupling coefficient m, k and resonator spacing s

i	m	k	s/mm
1~2	0.045 91	0.045 8	0.256
2~3	0.033 71	0.033 6	0.292
3~4	0.033 71	0.033 6	0.292
4~5	0.045 91	0.045 8	0.256

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参考文献(9)

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