基于SISL的介质填充双通带滤波器设计

李双旭; 马凯学; 闫宁宁; 陈雄; 傅海鹏

doi:10.12265/j.cjors.2021011

基于SISL的介质填充双通带滤波器设计

doi: 10.12265/j.cjors.2021011

李双旭^{1, 2},
马凯学^{1, 2, ,},
闫宁宁^{1, 2},
陈雄^{1, 2},
傅海鹏^{1, 2}

1.
天津大学微电子学院, 天津 300072
2.
天津市成像与感知微电子技术重点实验室, 天津 300072

基金项目: 国家自然科学基金（61831017）

详细信息

作者简介:
李双旭：（1996—），男，天津大学微电子学院硕士研究生，主要研究方向为微波滤波器理论与设计

马凯学：（1973—），男，天津大学微电子学院教授，主要研究方向为微波毫米波电路技术

闫宁宁：（1990—），女，天津大学微电子学院讲师，主要研究方向为天线理论与设计

陈雄：（1990—），男，天津大学微电子学院副教授，主要研究方向为微波毫米波电路器件非线性设计与先进测量方法

傅海鹏：（1985—），男，天津大学微电子学院副教授，主要研究方向为射频集成电路

通讯作者:
马凯学 E-mail: makaixue@tju.edu.cn

中图分类号: TN014
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出版历程
- 收稿日期: 2021-06-08
- 网络出版日期: 2021-10-21

A dielectric-filled dual-band bandpass filter based on SISL technology

LI Shuangxu^{1, 2},
MA Kaixue^{1, 2
, ,},
YAN Ningning^{1, 2},
CHEN Xiong^{1, 2},
FU Haipeng^{1, 2}

1.
School of Microelectronics, Tianjin University, Tianjin 300072, China
2.
Tianjin Key Laboratory of Imaging and Sensing Microelectronic Technology, Tianjin 300072, China

摘要

摘要: 为实现滤波器的小型化，基于介质集成悬置线(substrate integrated suspended line, SISL)结构提出了一种介质填充双通带滤波器的设计方案. 首先将高介电常数的介质块填充入SISL的空气腔中，提升SISL的等效介电常数，实现电路的小型化，高介电常数介质块可以直接被SISL固定；然后利用T型结连接两组工作在不同频段的滤波器从而使得两个通带相对独立；最后利用仿真软件进行优化，确定介质填充双通带滤波器的尺寸，并进行加工与测试. 仿真与测试结果表明，二者具有较好的一致性，两个通带频率内的回波损耗均优于15 dB，电路的核心尺寸为0.058λ_g×0.139λ_g(λ_g为SISL在第一通带中心频率处的导波波长). 此双通带滤波器具有小尺寸、自封装等优势，且所有层介质基板均采用低成本的FR4板材，降低了制造成本.
- 双通带滤波器 /
- 介质集成悬置线(SISL) /
- 高介电常数介质 /
- 传输零点 /
- 小型化技术
Abstract: This paper proposes a dielectric-filled dual-band bandpass filter (DF-DBBPF) using substrate integrated suspended line (SISL) technology to realize the miniaturization of the filter. In this design, high dielectric constant material is embedded in the SISL air cavity to construct a high equivalent dielectric constant and miniaturize the circuits. The high dielectric constant material is fixed directly by the SISL cavity. Meanwhile, by using T-junctions to design the dual-band bandpass filter, each passband response can be designed independently. With the help of the EM simulation software, all the dimensions are determined and the DF-DBBPF is processed and tested. The simulated and measured results of this design have the same tendency. The return loss of the two passbands are both better than 15 dB and the size of core circuit is only 0.058λ_g×0.139λ_g, which λ_g represents the guided wavelength at the central frequency of the first passband. The DF-DBBPF is with the advantage of compact size and self-packaging. Meanwhile, low-cost FR4 is chosen for all seven substrate boards.
- dual-band bandpass filter /
- substrate integrated suspended line (SISL) /
- high dielectric constant material /
- transmission zero point /
- miniaturization

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图 1 七层SISL介质填充结构三维示意图

Fig. 1 Three-dimensional schematic of the seven-layer SISL dielectric-filed structure

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图 2 所有层介质基板俯视图

Fig. 2 The top view of all substrate boards

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图 3 七层SISL介质填充结构侧视图

Fig. 3 The side view of the dielectric-filled structure based on seven-layer SISL

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图 4 SISL介质填充双通带滤波器的拓扑结构

Fig. 4 The topology of the dielectric-filled dual-band bandpass filter based on SISL

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图 5 电路层G₇结构图

Fig. 5 Configuration of the circuit layer G₇

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图 6 螺旋谐振器填充高介电常数介质块前后响应的变化

Fig. 6 The simulation of the spiral-like resonator with or without dielectric-filled

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图 7 单一滤波单元的电磁耦合关系等效电路图

Fig. 7 The equivalent circuit of the electromagnetic coupling relationship of a single filtering section

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图 8 不同W₁值对频率响应的影响

Fig. 8 The impact of different W₁ on the frequency response

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图 9 不同W₂值对频率响应的影响

Fig. 9 The impact of different W₂ on the frequency response

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图 10 多层PCB板结构以及SISL自封装介质填充双通带滤波器

Fig. 10 Multilayer PCB structure and the self-packaged dielectric-filled dual-band bandpass filter based on SISL

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图 11 SISL介质填充双通带滤波器的仿真与测试结果

Fig. 11 The simulated and measured results of the dielectric-filled dual-band bandpass filter based on SISL

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表 1 双通带滤波器电路层的参数

Tab. 1 Parameters of the dual-band bandpass filter circuit layer mm

W₁	W₂	W₃	W₄	W₅	W₆	W₇	W₈	W₉
0.15	0.15	0.15	0.15	0.15	0.3	0.15	0.2	0.15

W₁₀	W₁₁	W₁₂	L₁	L₂	L₃	L₄	L₅	L₆
0.2	0.3	0.2	4.25	5.65	3.45	0.65	0.5	0.83

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表 2 本设计与近期其他文献中双通带滤波器对比

Tab. 2 Comparison of this design with other dual-band bandpass filters in recent literatures

文献	电路面积	工作频率/GHz	自封装	传输线种类	介质基板材料	S₁₁ /dB	通带带宽 /%	插入损耗 /dB	通带隔离度 /dB
[1]	0.022λ_g ²	0.90/1.50	否	微带线	Rogers 4003	<−15/<−20	42.0/15.0	0.20/0.50	＞40
[4]	0.040λ_g ²	2.10/3.43	否	微带线	Rogers 4003	<−10/<−15	17.1/12.2	1.40/1.90	＞30
[9]	0.032λ_g ²	2.40/5.20	是	SISL	FR4和Rogers5880	<−15/<−15	45.4/21.6	0.59/0.55	＞20
[11]	0.023λ_g ²	2.55/3.91	是	SISL	FR4和Rogers5880	<−10/<−15	13.0/5.4	2.00/3.40	＞40
本文	0.008λ_g ²	3.55/4.96	是	SISL	FR4	<−15/<−15	21.6/9.3	1.98/3.83	＞30

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