高带外抑制特性微波陶瓷波导滤波器的设计

doi:10.11959/j.issn.1000-436x.2021029

通信学报 ›› 2021, Vol. 42 ›› Issue (4): 194-201.doi: 10.11959/j.issn.1000-436x.2021029

高带外抑制特性微波陶瓷波导滤波器的设计

梁飞, 蒙顺良, 吕文中

华中科技大学光学与电子信息学院，湖北武汉 430074

修回日期:2020-12-21 出版日期:2021-04-25 发布日期:2021-04-01
作者简介:梁飞（1975- ），男，湖北武汉人，博士，华中科技大学副教授、硕士生导师，主要研究方向为微波介质材料与器件。
蒙顺良（1996- ），男，广西贵港人，华中科技大学硕士生，主要研究方向为微波介质滤波器设计。
吕文中（1966- ），男，河南偃师人，博士，华中科技大学教授、博士生导师，主要研究方向为微波介质材料及其相关通信器件。
基金资助:
国家重点研发计划基金资助项目(2017YFB0406301);国家大学生创新创业训练计划基金资助项目(202010487051)

Design of microwave ceramic waveguide filter with high out-of-band suppression characteristics

Fei LIANG, Shunliang MENG, Wenzhong LYU

School of Optical and Electronic Information, Huazhong University of Science and Technology, Wuhan 430074, China

Revised:2020-12-21 Online:2021-04-25 Published:2021-04-01
Supported by:
The National Key Research and Development Program of China(2017YFB0406301);The National Under-graduate Training Projects for Innovation and Entrepreneurship(202010487051)

摘要/Abstract

摘要：

介绍了陶瓷波导滤波器的设计理论，采用耦合通槽分别与浅、深耦合盲孔的组合结构来满足正、负耦合带宽要求，通过调整 3～6 腔体的交叉耦合来改善滤波器传输曲线的对称性，同时实现滤波器近端和远端的带外抑制，在此基础上设计了一款5G基站用六腔陶瓷波导滤波器。在该滤波器的优化过程中，详细讨论了3～6腔体交叉耦合通槽的相对位置偏移量和交叉耦合通槽的长度对滤波器传输零点位置、近端和远端带外抑制特性的影响，并给出了相关的变化规律。经优化后滤波器性能指标如下：中心频率为3.5 GHz，工作带宽为200 MHz，插入损耗≤1.2 dB，回波损耗≥17 dB，近端带外抑制≥25 dB，远端带外抑制≥51 dB。根据仿真模型结构参数制备得到的样品，其性能测试结果与仿真结果吻合良好。

关键词: 陶瓷波导滤波器, 负耦合结构, 交叉耦合通槽, 带外抑制

Abstract:

The design theory of ceramic waveguide filter was introduced, and then the combination structure of coupling through slot with shallow or deep coupling blind hole was designed, which could meet the requirements of positive and negative coupling bandwidth.By adjusting the cross coupling between 3～6 cavities, the symmetry of the filter transmis-sion curve was improved, and the near and far end band suppression of the filter was realized.Finally, a six-cavity ce-ramic waveguide filter for 5G base station was designed.In the process of optimizing the filter, the influences of the rela-tive position offset of the cross-coupling through slot and the length of the cross-coupling through slot on the transmis-sion zero position, the near end and far end out of band suppression characteristics of the filter were discussed in detail, and the relevant change rules were given.The performance indexes of the optimized filter were as follows, center fre-quency was 3.5 GHz, working bandwidth was 200 MHz, insertion loss ≤ 1.2 dB, return loss ≥ 17 dB, near end out of band rejection ≥ 25 dB, far end out of band rejection ≥ 51 dB.According to the structural parameters of the simulation model, the performance test results of the samples are in good agreement with the simulation results.

Key words: ceramic waveguide filter, negative coupling structure, cross-coupling through slot, out-of-band suppression

中图分类号:

TN713

梁飞, 蒙顺良, 吕文中. 高带外抑制特性微波陶瓷波导滤波器的设计[J]. 通信学报, 2021, 42(4): 194-201.

Fei LIANG, Shunliang MENG, Wenzhong LYU. Design of microwave ceramic waveguide filter with high out-of-band suppression characteristics[J]. Journal on Communications, 2021, 42(4): 194-201.

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参考文献 18

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参数	取值
Freq/MHz	3 498
CBW₁₂/MHz	180
CBW₂₃/MHz	127
CBW₃₄/MHz	117
CBW₃₆/MHz	24
CBW₄₅/MHz	?143
CBW₅₆/MHz	178
Qex/MHz	16

参数	取值	参数	取值
H₁/mm	2.45	L₁₂/mm	3.56
H₂/mm	2.32	L₁₆/mm	6.25
H₃/mm	2.42	L₂₃/mm	1.47
H₄/mm	2.64	L₃₄/mm	1.53
H₅/mm	2.63	L₃₆/mm	2.89
H₆/mm	2.52	L₄₅/mm	2
H₄₅/mm	3.95	L₅₆/mm	1.47
H₅₆/mm	1.8	S₁/mm	2.1
W/mm	1.5	S₂/mm	2.15

位置	低频零点/GHz	高频零点/GHz	低频处远端抑制/dB	低频处近端抑制/dB	高频处近端抑制/dB	高频处远端抑制/dB
右端	3.292	3.714	55.89	23.69	26.16	61.95
右移0.5 mm	3.289	3.709	57.07	23.73	26.26	59.67
中间	3.283	3.703	59.27	23.81	26.01	56.79
左移0.5 mm	3.277	3.696	61.56	23.87	26.14	54.07
左端	3.272	3.690	63.21	23.86	26.70	51.77

通槽长度/mm	低频零点/GHz	高频零点/GHz	低频处远端抑制/dB	低频处近端抑制/dB	高频处近端抑制/dB	高频处远端抑制/dB
3.08	3.270	3.720	62.22	22.88	25.26	62.30
2.92	3.287	3.707	57.93	23.86	26.02	58.55
2.80	3.298	3.698	54.74	24.77	26.66	55.76
2.67	3.309	3.688	51.38	26.08	27.61	52.41
2.53	3.320	3.677	47.58	27.23	30.02	49.01

对比项	中心频率/GHz	插入损耗/dB	回波损耗/dB	近端处带外抑制/dB	远端处带外抑制/dB	体积/cm³
文献[4]	1.948	≤1.5	≥20	≥75	≥100	113.4
文献[17]	2.55	≤1.24	≥18	≥40	≥60	30.855
文献[18]	3.5	≤0.82	≥20	≥15	≥20	15.6
本文	3.5	≤1.2	≥17	≥25	≥51	3.162

高带外抑制特性微波陶瓷波导滤波器的设计

Design of microwave ceramic waveguide filter with high out-of-band suppression characteristics

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