General Synthesis for Microwave Filters With Frequency Linear Dependent Couplings Using Circuit Approach

Yang, Yimin1; Liu, Beizun2,3; Wu, Qiuyi4; Yu, Ming2,3

2024-09-01

10.1109/TMTT.2024.3461211

IEEE TRANSACTIONS ON MICROWAVE THEORY AND TECHNIQUES   影响因子和分区

0018-9480

1557-9670

This article extends the circuit-based approach to synthesizing coupling matrices (CMs), allowing for the inclusion of frequency-dependent couplings (FDCs). First, it provides a comprehensive study of the inherent properties of FDCs, revisiting the minimum path rule and revealing that extending from frequency-invariant couplings (FICs) to FDC amplifies nonphysical traits, such as the generation of second-order zeros in local circuits. When FDC is used as input or output (I/O) coupling, it inevitably introduces right-half-plane (RHP) roots into the overall network. However, these nonphysical traits can be managed during physical circuit construction, allowing FDC circuits to effectively guide microwave filter design. Second, within the CM framework, the article proposes an analytical method for synthesizing FDC-coupled networks, including I/O couplings. A novel and straightforward synthesis approach based on circuit element extraction is introduced, eliminating the need for intermediate steps involving frequency-invariant matrices or extracted pole (EP) circuits. Furthermore, an analytical method for the de-normalization of directly coupled FDC filters is presented, facilitating dimensional synthesis. The versatility and effectiveness of the proposed method are demonstrated through various synthesis examples, including detailed physical dimension calculations and validation against measured data.

Couplings Microwave filters Microwave circuits Transmission line matrix methods Resonant frequency Microwave theory and techniques Polynomials Circuit synthesis de-normalization direct-coupled resonators frequency-dependent coupling (FDC) transmission zeros (TZs)

SCI

英语

其他

National Key Research and Development Program of China[2021YFA1003400]

Engineering

Engineering, Electrical & Electronic

WOS:001322044200001

IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC

Web of Science

1.Xidian Univ, Sch Artificial Intelligence, Xian 710071, Peoples R China
2.Southern Univ Sci & Technol, Shenzhen Key Lab EM Informat, Shenzhen 518055, Peoples R China
3.Southern Univ Sci & Technol, Dept Elect & Elect Engn, Shenzhen 518055, Peoples R China
4.Xidian Univ, Sch Elect Engn, Xian, Peoples R China

Yang, Yimin,Liu, Beizun,Wu, Qiuyi,et al. General Synthesis for Microwave Filters With Frequency Linear Dependent Couplings Using Circuit Approach[J]. IEEE TRANSACTIONS ON MICROWAVE THEORY AND TECHNIQUES,2024.

Yang, Yimin,Liu, Beizun,Wu, Qiuyi,&Yu, Ming.(2024).General Synthesis for Microwave Filters With Frequency Linear Dependent Couplings Using Circuit Approach.IEEE TRANSACTIONS ON MICROWAVE THEORY AND TECHNIQUES.

Yang, Yimin,et al."General Synthesis for Microwave Filters With Frequency Linear Dependent Couplings Using Circuit Approach".IEEE TRANSACTIONS ON MICROWAVE THEORY AND TECHNIQUES (2024).