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

Abstract

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

CLC Number:

TN713

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.

Figures/Tables 19

References 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

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

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