具有小型化与高选择性的双频带通滤波器的设计

王远; 刘超; 南敬昌; 高明明

doi:10.12265/j.cjors.2021138

具有小型化与高选择性的双频带通滤波器的设计

doi: 10.12265/j.cjors.2021138

王远^1, ,,
刘超¹,
南敬昌¹,
高明明^{1, 2}

1.
辽宁工程技术大学，葫芦岛 125105
2.
大连海事大学，大连 116000

基金项目: 国家自然科学基金（61971210）；辽宁省教育厅科学研究经费（LJ2020QNL016）；国家留学基金（CSC201908210174）

详细信息

作者简介:
王远：（1997—），男，河北人，辽宁工程技术大学研究生，研究方向为射频无源滤波器的研究与设计

刘超：（1981—），男，辽宁人，辽宁工程技术大学硕士生指导教师，硕士，研究方向为数字系统、嵌入式系统、射频与微波系统设计

南敬昌：（1971—），男，河南人，辽宁工程技术大学教授，硕士生导师，博士，研究方向为射频电路与器件、多媒体信息编码、通信系统仿真等

通讯作者:
王远 E-mail：821485478@qq.com

中图分类号: TN713
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出版历程
- 收稿日期: 2021-05-13
- 网络出版日期: 2021-09-06

Design of a dual-band bandpass filter with miniaturization and high selectivity

WANG Yuan^{1
, ,},
LIU Chao¹,
NAN Jingchang¹,
GAO Mingming^{1, 2}

1.
Liaoning Technical University, Huludao 125105, China
2.
Dalian Maritime University, Dalian 116000, China

摘要

摘要: 为了满足C波段卫星通信系统的应用需求，提出了一种具有小型化与高选择性的双频带通基片集成波导滤波器. 滤波器第一通带由蚀刻在四分之一模基片集成波导腔顶层的L型谐振槽提供，第二通带由新型左右手结构提供. 其中L型谐振槽可以充当四分之一波长谐振器，激励腔内基本模式产生低频处的响应；新型左右手结构较传统结构增大了叉指电容值，降低了谐振频率. 通过仿真优化和测试，双频带通滤波器的中心频率为3.9 GHz和6.2 GHz，相对带宽为3.3%和2.1%，通带之间的衰减优于70 dB，且在通带外存在三个传输零点，具有良好的频率选择性. 表明了所提滤波器具有体积小、选择性高的特性，非常适合集成于卫星通信前端系统中.
- 双频带通滤波器 /
- 基片集成波导 /
- 小型化 /
- 高选择性 /
- L型谐振槽 /
- 左右手结构
Abstract: In order to meet the application requirements of C-band satellite communication system, a dual-band bandpass substrate integrated waveguide filter with miniaturization and high selectivity is proposed. The first passband of the filter is provided by an L-shaped resonant slot etched in the top layer of the quarter-mode substrate integrated waveguide cavity, and the second passband is provided by a new right/left-handed structure. The L-shaped resonant slot can act as a quarter-wavelength resonator to excite the fundamental mode in the cavity to produce a response at low frequencies; the new right/left-handed structure increases the fork-finger capacitance value compared with the conventional structure, then reduces the resonant frequency. Through simulation optimization and testing, the center frequencies of the dual-band bandpass filter are 3.9 GHz and 6.2 GHz with relative bandwidths of 3.3% and 2.1%, and the attenuation between the passbands is better than 70 dB, and three transmission zeros exist outside the passbands with good frequency selectivity. It is shown that the proposed filter has the characteristics of small size and high selectivity, which is very suitable for integration in the front-end system of satellite communication.
- dual-band bandpass filter /
- substrate integrated waveguide /
- miniaturization /
- high selectivity /
- L-shaped resonant slot /
- right/left-handed structure

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图 1 滤波器结构图

Fig. 1 Structure of the filter structure

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图 2 滤波器的前四个本征模式电场矢量分布图

Fig. 2 Electric vector field distribution of the first four eigen-modes of the filter

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图 3 谐振单元耦合示意图

Fig. 3 The graph of coupling scheme of the resonant unit

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图 4 耦合QMSIW滤波器传输特性

Fig. 4 Coupled QMSIW filter transmission characteristics

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图 5 L₁+L₂对中心频率的影响

Fig. 5 L₁+L₂ influence on center frequency

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图 6 加载传统CRLH结构的SIW腔

Fig. 6 SIW loaded with conventional CRLH structure

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图 7 加载传统CRLH结构的SIW腔的等效电路图

Fig. 7 Diagram of equivalent circuit of SIW loaded with conventional CRLH structure

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图 8 两种CRLH结构的比较

Fig. 8 The comparison of two CRLH structures

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图 9 仿真与测试结果比对

Fig. 9 The comparison of simulation and measurement

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图 10 滤波器实物图

Fig. 10 Physical picture of the filter

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表 1 滤波器的尺寸

Tab. 1 The size of the filter

mm
参数	取值	参数	取值
$L$	18.0	$L_1$	4.5
$W$	9.0	$L_2$	7.4
$P$	6.5	$L_3$	7.2
$K$	1.5	$L_4$	3.0
$O$	0.8	$W_1$	0.2
$D$	0.4	$W_2$	0.6
$S$	0.6

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表 2 滤波器性能比较

Tab. 2 Comparison with other references

文献	中心频率/GHz	阶数	传输零点数	尺寸
[6]	13.00/14.00	3	3	18.3 mm×51.7 mm
[7]	10.05/13.70	2	1	14.3 mm×16.0 mm
[8]	5.39/10.12	2	3	14.0 mm×25.5 mm
[9]	5.80/18.10	2	3	8.5 mm×16.0 mm
[10]	5.00/8.50	4	4	33.9 mm×53.0 mm
本文	3.90/6.20	3	3	9.0 mm×18.0 mm

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参考文献(18)

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