基于新型自耦合非对称阶梯阻抗谐振器的小型化三通带平衡滤波器

张俊杰; 李建兵; 周东方; 刘庆; 王显; 张德伟

doi:10.11884/HPLPB202133.200153

基于新型自耦合非对称阶梯阻抗谐振器的小型化三通带平衡滤波器

doi: 10.11884/HPLPB202133.200153

中国人民解放军战略支援部队信息工程大学，郑州 450001

基金项目: 核高基重大专项（2013ZX01010003-004）

详细信息

作者简介:
张俊杰（1996—），女，硕士，从事射频/微波器件研究；zhunzhunjj@163.com

通讯作者:
李建兵（1976—），男，副教授，从事微波功率模块及射频/微波电路设计；49286894@qq.com

中图分类号: TN715
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- 被引次数: 0
出版历程
- 收稿日期: 2020-06-04
- 修回日期: 2020-11-11
- 刊出日期: 2021-01-07

Miniaturized tri-band balanced filter based on a novel asymmetric stepped impedance resonator with self-coupling

PLA Strategic Support Force Information Engineering University, Zhengzhou 450001, China

摘要

摘要: 针对平衡滤波器的高集成度和高选择性的应用需求，基于一种新型自耦合非对称阶梯阻抗谐振器提出了一种具有高选择性的小型化三通带平衡滤波器。首先通过该平衡滤波器的差模和共模等效电路详细分析了其谐振器结构的谐振特性，并利用差模等效电路下的前三个谐振模式来分别实现三个通带。另外通过在电路对称面上加载电容和电阻元件来提高对共模噪声的抑制，且不影响差模频率响应特性。基于提出的多模平衡滤波器结构和设计方法，设计了一个通带频率为2.75/4.46/6.21 GHz的三通带平衡滤波器，并对其进行了加工和测试，结果表明，该结构可以实现紧凑的体积和高选择特性，并且具有很好的共模抑制特性。
- 平衡滤波器 /
- 三通带 /
- 共模抑制 /
- 自耦合 /
- 非对称阶梯阻抗谐振器
Abstract: For the application requirements of high integration and high selectivity of balanced filters, this paper proposes a novel balanced tri-band filter with high selectivity, which is based on an improved asymmetric stepped impedance resonator structure with self-coupling. Firstly, through the differential mode and common mode equivalent circuits of the balanced filter, the resonant characteristics of the resonator structure are specifically analyzed, and the first three resonance modes under the differential mode equivalent circuit are used to form three passbands respectively. In addition, by loading capacitors and resistance elements on the symmetrical surface of the circuit, the suppression of CM signals can be improved without affecting DM signals based on the proposed multimode balanced filter structure and design method, and a balanced tri-band filter with passband frequencies of 2.75/4.46/6.21 GHz was designed, processed and tested. The results show that the structure can achieve a compact size and high selection characteristics, and has good common mode rejection characteristics.
- balanced filter /
- tri-band /
- common-mode (CM) suppression /
- self-coupling /
- asymmetric stepped impedance resonator

HTML全文

图 1 新型SC-ASIR传输线模型及其差模/共模等效电路

Figure 1. Transmission line model of the proposed SC-ASIR and its DM & CM equivalent circuit

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图 2 CLSs和TLSs二端口网络等效电路模型

Figure 2. Equivalent circuit model of CLSs and TLSs

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图 3 θ₄＝67°, Z_c4＝87.61 Ω时频率比f_d₂/f_d₁和f_d₃/f_d₁随不同阻抗和长度比变化曲线

Figure 3. Different frequencies ratios versus different parameters with θ₄＝67°，Z_c₄＝87.61 Ω

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图 4 等效电路下输入导纳θ与关系以及差模S₂₁响应曲线

Figure 4. Input admittances versus θ and DM responses under weak coupling

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图 5 耦合系数随耦合间距S₂的变化曲线以及不同K值和Z_c4下的差模S₂₁响应

Figure 5. Coupling coefficient curves and simulated DM responses versus different parameters

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图 6 加载电阻电容元件前后DM和CM的频率响应

Figure 6. Simulated DM & CM responses without/with loaded elements

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图 7 三通带平衡滤波器的结构以及仿真与测试结果

Figure 7. The layout and the simulated and measured S-parameters of the proposed balanced tri-band filter

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表 1 与已发表的多通带平衡滤波器结果对比

Table 1. Comparisons with the previous multi-band balanced BPFs

source	f_0DM/GHz	3-dB FBW/%	\|S₂₁\| @ CM＞20 dB/(GHz)	insertion loss/dB	TZs	circuit size/λ_g×λ_g
ref. [3]	2.5/5.9	14.0/6.6	1.0−8.0	3.21/3.9	2	0.48×0.28
ref. [4]	1.64/2.54	4.4/2.96	0.5−3.5	2.266/2.97	5	0.73×0.52
ref. [6]	2.5/3.5/5.8	13.2/3.1/3.5	2.0−8.0	0.8/2.3/2.4	1	0.38×0.2
ref. [8]	2.4/3.51/5.2	7.0/5.5/3	1.0−7.0	2.43/3.5/3.6	6	0.49×0.35
ref. [11]	2.45/3.5/5.25	1.22/2/1.52	2.0−8.0	0.71/0.92/0.67	5	0.56×0.43
this work	2.75/4.45/6.21	9.1/7.6/5.0	1.0−8.0	0.94/1.82/2.02	3	0.45×0.27

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