A Novel Design Method for High Isolated Microstrip Diplexers Without Extra Matching Circuit

被引：19
作者：
Guan, Xuehui [1 ]
Liu, Wang [1 ]
Ren, Baoping [1 ]
Liu, Haiwen [2 ]
Wen, Pin [2 ]
机构：
[1] East China Jiaotong Univ, Sch Informat Engn, Nanchang 330013, Jiangxi, Peoples R China
[2] Xi An Jiao Tong Univ, Sch Elect & Informat Engn, Xian 710049, Peoples R China
来源：
IEEE ACCESS | 2019年 / 7卷
基金：
美国国家科学基金会;
关键词：
Composite resonator; extra matching circuit; high isolation; impedance transformation; microstrip diplexer; transmission zeros; BANDPASS-FILTERS; PLANAR DUPLEXERS; COMPACT; MULTIPLEXER; TRIPLEXERS;
D O I：
10.1109/ACCESS.2019.2936553
中图分类号：
TP [自动化技术、计算机技术];
学科分类号：
0812 ;
摘要：
A novel design method of microstrip diplexer without extra matching circuit is proposed in this paper. Because of the synthesizable circuit parameters and controllable transmission zeros (TZs) in composite resonator (CR) cell, diplexer A based on CR cell is proposed. By allocating TZs at center frequency of the opposite channel, as well as the using of impedance transformations of J-inverters, high isolation and good passband selectivity are realized in diplexer A without extra matching circuit. In order to improve the stopband performance, diplexer B based on coupled CR cells is proposed. Furthermore, diplexer B using the proposed design method is implemented by directly combining two bandpass filters (BPFs), which simplifies significantly the design process of diplexers. Diplexer A operated at 1/1.2 GHz and diplexer B operated at 1/1.5 GHz are designed and fabricated. The measured isolation characteristics in diplexer A and diplexer B are all higher than 40 dB. Good agreements between simulated and measured results are achieved, which successfully verifies the proposed design method of diplexers.
引用
收藏
页码：119681 / 119688
页数：8
相关论文
共 28 条
[1]   High-Isolation and High-Rejection Microstrip Diplexer With Independently Controllable Transmission Zeros [J].
Chen, Chi-Feng ;
Lin, Cheng-Yu ;
Tseng, Bo-Hao ;
Chang, Sheng-Fa .
IEEE MICROWAVE AND WIRELESS COMPONENTS LETTERS, 2014, 24 (12) :851-853
[2]   A Novel Planar Diplexer Using Slotline-Loaded Microstrip Ring Resonator [J].
Chen, Dong ;
Zhu, Lei ;
Bu, Huizheng ;
Cheng, Chonghu .
IEEE MICROWAVE AND WIRELESS COMPONENTS LETTERS, 2015, 25 (11) :706-708
[3]   Design of Wide-Stopband Bandpass Filter and Diplexer Using Uniform Impedance Resonators [J].
Chen, Fu-Chang ;
Hu, Hao-Tao ;
Li, Run-Shuo ;
Chen, Jian-Feng ;
Luo, Di ;
Chu, Qing-Xin ;
Lancaster, Michael J. .
IEEE TRANSACTIONS ON MICROWAVE THEORY AND TECHNIQUES, 2016, 64 (12) :4192-4203
[4]   Design of matching circuits for microstrip triplexers based on stepped-impedance resonators [J].
Deng, Pu-Hua ;
Lai, Ming-Iu ;
Jeng, Shyh-Kang ;
Chen, Chun Hsiung .
IEEE TRANSACTIONS ON MICROWAVE THEORY AND TECHNIQUES, 2006, 54 (12) :4185-4192
[5]   Signal-Interference Stepped-Impedance-Line Microstrip Filters and Application to Duplexers [J].
Gomez-Garcia, Roberto ;
Munoz-Ferreras, Jose-Maria ;
Sanchez-Renedo, Manuel .
IEEE MICROWAVE AND WIRELESS COMPONENTS LETTERS, 2011, 21 (08) :421-423
[6]   Compact, Low Insertion-Loss, and Wide Stopband HTS Diplexer Using Novel Coupling Diagram and Dissimilar Spiral Resonators [J].
Guan, Xuehui ;
Yang, Fangqi ;
Liu, Haiwen ;
Ma, Zhewang ;
Ren, Baoping ;
Huang, Wei ;
Wen, Pin .
IEEE TRANSACTIONS ON MICROWAVE THEORY AND TECHNIQUES, 2016, 64 (08) :2581-2589
[7]   Compact and High-Isolation Diplexer Using Dual-Mode Stub-Loaded Resonators [J].
Guan, Xuehui ;
Yang, Fangqi ;
Liu, Haiwen ;
Zhu, Lei .
IEEE MICROWAVE AND WIRELESS COMPONENTS LETTERS, 2014, 24 (06) :385-387
[8]  
Hong J. S., 2001, MICROWAVE FILTERS RF
[9]   Microstrip stepped impedance resonator bandpass filter with an extended optimal rejection bandwidth [J].
Kuo, JT ;
Shih, E .
IEEE TRANSACTIONS ON MICROWAVE THEORY AND TECHNIQUES, 2003, 51 (05) :1554-1559
[10]   COMPACT DIPLEXER USING SHORT STUB-LOADED COMPOSITE RIGHT/LEFT-HANDED RESONATORS [J].
Li, Mengze ;
Xu, Kai-Da ;
Ai, Jing ;
Liu, Yanhui .
MICROWAVE AND OPTICAL TECHNOLOGY LETTERS, 2017, 59 (06) :1470-1474
123