0.3 THz TM<sub>10, 1, 0</sub>模同轴耦合腔链

肖宇杰; 林福民

doi:10.11884/HPLPB201830.180153

0.3 THz TM_{10, 1, 0}模同轴耦合腔链

doi: 10.11884/HPLPB201830.180153

肖宇杰,
林福民^,

广东工业大学物理与光电工程学院, 广州 510006

基金项目:

广东省自然科学基金项目 501160088

详细信息

作者简介:
肖宇杰(1994 —)，男，硕士研究生，主要研究方向为大功率微波器件; xiao_yujie2012@163.com

通讯作者:
林福民(1964 —)，男，博士，主要研究方向为大功率微波器件、微波滤波器与卫星导航天线等; linfumin@gdut.edu.cn

中图分类号: TN122
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出版历程
- 收稿日期: 2018-05-01
- 修回日期: 2018-07-11
- 刊出日期: 2018-10-15

0.3 THz TM_{10, 1, 0} mode coaxial coupled cavity chain

Xiao Yujie,
Lin Fumin^,

School of Physics and Optoelectronic Engineering, Guangdong University of Technology, Guangzhou 510006, China

摘要

摘要: 通过本征方程研究了工作在太赫兹(THz)频段的高次模同轴谐振腔，讨论了TM_{m, 1, 0}模，TM_{m, 2.0}模与TM_{m, 1, 1}模的谐振频率与腔体的几何参数之间的关系，并给出了工作模式的选择依据。在此基础上，提出了一种新型的0.3 THz TM_{10, 1, 0}模同轴耦合腔链，使用等效电路模型和CST-MWS软件对耦合腔链的色散特性、特征阻抗和电场分布等冷腔特性进行了分析和仿真，并着重分析和总结了耦合腔链的几何参数对色散特性和特征阻抗的影响。研究结果表明：对于工作在THz频段的高次模同轴耦合腔链，采用TM_{10, 1, 0}模为工作模式是合理的选择; 工作于2π腔模的0.3 THz TM_{10, 1, 0}模同轴耦合腔链具有较大的特征阻抗，但模式间隔较小，因此可将其应用于窄带太赫兹扩展互作用器件; 增大高次模耦合腔链的耦合槽张角是增大模式间隔的最佳途径。
- 太赫兹 /
- 同轴谐振腔 /
- 高次模 /
- 耦合腔链 /
- CST-MWS仿真软件
Abstract: In this paper, the eigen equation is utilized to study the high-order mode coaxial resonant cavity operating in the terahertz (THz) band, the cavity's resonant frequencies of TM_{m, 1, 0} mode, TM_{m, 2, 0} mode and TM_{m, 1, 1} mode associating with the geometric parameters are discussed, and the evidence for selecting the operating mode is presented. On this foundation, a new type of 0.3 THz TM_{10, 1, 0} mode coaxial coupled cavity chain is proposed, analyzed by equivalent circuit and simulated by CST-MWS simulation software. Its properties of cold cavity such as dispersion characteristic, characteristic impedance and electric field pattern are presented. In addition, the effect of the geometric parameters on the dispersion characteristic and the characteristic impedance is analyzed and summarized emphatically. The results of the study indicate that, TM_{10, 1, 0} mode is a reasonable operating mode for the THz high-order mode coaxial coupled cavity chain. The 0.3 THz TM_{10, 1, 0} mode coaxial coupled cavity chain operating in the 2π cavity mode has a large characteristic impedance, but the frequency spacing between the modes is small, so it can be applied to a narrow-band terahertz extended interaction device. Increasing the angle of the coupling slot is the best way to increase the mode spacing.
- terahertz /
- coaxial resonant cavity /
- high-order mode /
- coupled cavity chain /
- CST-MWS simulation software

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图 1 谐振频率与a/b的关系

Figure 1. Resonant frequency of TM_{m, 1, 0} mode and TM_{m, 2, 0} mode with respect to the ratio a/b

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图 2 TM_{m, 1, 1}模谐振频率与腔体高度的关系

Figure 2. Resonant frequency of TM_{m, 1, 1} mode with respect to the cavity height

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图 3 0.3 THz TM_{10, 1, 0}模4间隙同轴耦合腔链的结构示意图

Figure 3. Schematic of the 0.3 THz TM_{10, 1, 0} mode four-gap coaxial coupled cavity chain

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图 4 4间隙耦合腔链的等效电路

Figure 4. Equivalent circuit of the four-gap coupled cavity

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图 5 TM_{10, 1, 0}模的色散特性曲线

Figure 5. Dispersion characteristic curves of TM_{10, 1, 0} mode

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图 6 腔模的轴向电场分布

Figure 6. Axial electric field distribution of the cavity-modes

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图 7 轴向电场沿角向的分布情况

Figure 7. Angular patterns of axial electric field strength

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图 8 不同耦合槽张角下的2π腔模电场分布

Figure 8. Electric field patterns of the 2π cavity-mode at different slot angles

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图 9 截止频率与k的关系

Figure 9. Cut-off frequency with respect to the coupling constant k

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图 10 截止频率与s的关系

Figure 10. Cut-off frequency with respect to the ratio s

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图 11 不同耦合槽张角对应的色散特性曲线

Figure 11. Dispersion characteristic curves with different slot angle

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图 12 不同耦合槽宽度对应的色散特性曲线

Figure 12. Dispersion characteristic curves with different slot width

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图 13 不同腔体高度对应的色散特性曲线

Figure 13. Dispersion characteristic curves with different cavity height

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图 14 不同周期长度对应的色散特性曲线

Figure 14. Dispersion characteristic curves with different period length

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图 15 特征阻抗与耦合槽的关系

Figure 15. Characteristic impedance with respect to the slot

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表 1 0.3 THz TM_{10, 1, 0}模同轴耦合腔链的几何参数

Table 1. Geometric parameters of the 0.3 THz TM_{10, 1, 0} mode coaxial coupled cavity chain

a/mm	b/mm	h/mm	L/mm	r_m/mm	r/mm	α/°	t/mm
2.43	1.5	0.45	1.51	1.98	0.2	54	0.1

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表 2 CST-MWS仿真得到的谐振频率和特征阻抗

Table 2. Resonant frequencies and characteristic impedance obtained by CST-MWS

θ/rad	f_c/GHz	f_s/GHz	(R/Q)/Ω
0(2π)	300.06	304.37	45
π/4	297.54	306.68	28
2π/4	294.03	309.93	28
3π/4	290.98	311.57	23
π	289.54	312.19	27

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