Advanced Synthesis and Precise Design of Inline Fully Canonical Filters With High Selectivity

Yi Zeng; Ming Yu; Tao Zhou

2022

10.1109/TMTT.2022.3220530

IEEE Transactions on Microwave Theory and Techniques   Impact Factor & Quartile

1557-9670

1557-9670

This article presents an advanced synthesis and novel designs of inline fully canonical filters with $N$ cascaded extracted pole (EP) sections, providing higher band-edge selectivity and suppressing interference from adjacent bands. The conventional fully canonical prototype is reconfigured to significantly facilitate filter design and fabrication. Moreover, to synthesize realizable circuits, a general node scaling method based on admittance matrix is implemented. All associated elements, especially the junction susceptances, can be scaled directly without the aid of inverters, avoiding intricate equivalent circuit transforms. Furthermore, the importance of precise control over the junction susceptances in filter design is discussed for the first time. Accurate junction susceptance enables the exact mapping from synthesized circuits to physical structures, preventing brute-force optimization. In particular, a new and compact EP structure in coaxial technique is proposed with flexibly tuned loading phase and accurately regulated junction susceptance. The good measurement results of a coaxial EP filter with four reflection zeros (RZs) and four transmission zeros (TZs) validate the effectiveness of the proposed theories. Also, this is the first reported coaxial fully canonical filter with only build-in capacitive couplings to avoid passive intermodulation (PIM).

Extracted pole (EP) filter synthesis fully canonical junction susceptance transmission zero (TZ)

SCI

English

First

Shenzhen Key Laboratory of EM Information[ZDSYS20210709113201005]

Engineering

Engineering, Electrical & Electronic

WOS:000890828200001

IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC

IEEE

Department of Electronics and Electrical Engineering, Shenzhen Key Laboratory of EM Information, Southern University of Science and Technology, Shenzhen, China

Yi Zeng,Ming Yu,Tao Zhou. Advanced Synthesis and Precise Design of Inline Fully Canonical Filters With High Selectivity[J]. IEEE Transactions on Microwave Theory and Techniques,2022,PP(99):1-10.

Yi Zeng,Ming Yu,&Tao Zhou.(2022).Advanced Synthesis and Precise Design of Inline Fully Canonical Filters With High Selectivity.IEEE Transactions on Microwave Theory and Techniques,PP(99),1-10.

Yi Zeng,et al."Advanced Synthesis and Precise Design of Inline Fully Canonical Filters With High Selectivity".IEEE Transactions on Microwave Theory and Techniques PP.99(2022):1-10.