航空用高速连接器信号反射抑制与优化设计

doi:10.7527/S1000-6893.2023.28937

Abstract

Abstract:

Optimizing the electrical-mechanical structure of high-speed connector to suppress the reflection of signals during its internal transmission is essential to improve the transmission performance of high-speed connectors and the stability of high-speed interconnection systems. The fundamental sources and influencing factors of the signal reflection of high-speed connectors are analyzed， and an optimal design method for improving signal reflection of high-speed connectors in engineering is proposed based on simulation results of optimized quantities. Firstly， the characterization parameters of the signal reflection problem in the frequency and time domains are derived. Then， HFSS simulation is conducted to analyze the influence law of change of each optimized parameter on signal reflection. Finally， based on the simulation results， the system optimization scheme of the high-speed connector is determined with the objective of optimizing the characterization parameters of signal reflection， and its effectiveness is verified by test experiments. The design results show that signal reflection is aggravated when there is a large difference in wire diameter at the line diameter change of the con-tact pins， and signal reflection can be effectively suppressed by increasing the diameter of the terminated cable and choosing the insulator materials with smaller dielectric constants for socket ends. The optimization result shows that after adopting the proposed optimization design method， the maximum value of differential impedance of high-speed connectors is reduced to less than 110 Ω， the minimum value is increased by more than 2.72%， and the fluctuation range is reduced by 31.7%-41.8%. The maximum value of return loss in different frequency range is reduced， with the overall value reduction of about 9.8%-12.3%. The problem of signal reflection is shown to be significantly improved.

Key words: high-speed connector, signal reflection, signal transmission, signal integrity, HFSS simulation, aviation communication, optimization design

CLC Number:

V243.1

Yanyan LUO, Shuo YANG, Xiaosong PAN, Xuhuai ZHAO, Li ZHANG. Signal reflection suppression and optimized design of high⁃speed connectors for aerospace applications[J]. Acta Aeronautica et Astronautica Sinica, 2024, 45(7): 328937.

Figures/Tables 37

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仿真项目	Δb/mm	b/mm
仿真1	-0.52	0.51（b=c）
仿真2	-0.26	0.77
仿真3	+0.24	1.27（b=a）

仿真项目	Δd/mm	d/mm
仿真4	-0.4	1.5
仿真5	-0.8	1.1
仿真6	-1.2	0.7

d/mm	最小值/Ω	最大值/Ω	波动范围/Ω
0.7	90.13	110.72	20.59
1.1	90.18	110.74	20.56
1.5	90.15	110.75	20.60
1.9	90.23	110.78	20.55

d/mm	最大回波损耗/dB
d/mm	600 MHz	2 GHz	5 GHz
0.7	-29.10	-8.70	-7.90
1.1	-29.10	-8.71	-7.90
1.5	-29.12	-8.73	-7.91
1.9	-29.12	-8.75	-7.91

d/mm	最大回波损耗/dB
d/mm	600 MHz	2 GHz	5 GHz
0.7	-21.88	-8.15	-6.90
1.1	-21.88	-8.17	-6.95
1.5	-21.89	-8.20	-6.95
1.9	-21.90	-8.21	-6.96

Signal reflection suppression and optimized design of high⁃speed connectors for aerospace applications

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仿真项目	Δh/mm	h/mm
仿真7	-0.05	1.85
仿真8	-0.02	1.88
仿真9	+0.02	1.92
仿真10	+0.05	1.95

介质厚度/mm	最小值/Ω	最大值/Ω	波动范围/Ω
6.02	90.23	110.78	20.55
6.00	90.23	110.78	20.55
5.97	90.22	110.74	20.52
5.92	90.18	110.75	20.57

介质厚度/mm	最大回波损耗/dB
介质厚度/mm	600 MHz	2 GHz	5 GHz
6.02	-29.12	-8.75	-7.91
6.00	-28.99	-8.73	-7.91
5.97	-28.98	-8.71	-7.89
5.92	-28.95	-8.67	-7.86

电缆线径/mm	介质材料	最小值/Ω	最大值/Ω	波动范围/Ω
0.44	LCP	89.81	109.27	19.46
0.44	PTFE	94.75	108.62	13.87
0.46	LCP	89.31	106.01	16.7
0.46	PTFE	94.08	105.88	11.8

电缆线径/mm	介质材料	最大回波损耗/dB
电缆线径/mm	介质材料	600 MHz	2 GHz	5 GHz
0.44	LCP	-35.23	-12.23	-11.51
0.44	PTFE	-35.01	-13.38	-13.05
0.46	LCP	-38.02	-14.13	-12.14
0.46	PTFE	-38.95	-15.09	-13.82

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线径/mm	插入损耗/dB	近端串扰/dB	远端串扰/dB
0.44	-3.31	-31.94	-32.98
0.46	-3.12	-31.91	-33.11