Exploiting Redundancy in Direct Synthesis for Inline Filters

Zeng，Yi1; Yang，Yimin2; Wu，Yang1; Yu，Ming3; Peng，Jie4; Liang，Dan4

2021

10.1109/TMTT.2021.3093543

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

0018-9480

1557-9670

The generalized Chebyshev (pseudoelliptical) filter functions may not be optimal for certain applications due to physical constrains. With redundancy in filter polynomials, this article breaks down the “mental barrier” in conventional synthesis and directly synthesizes the “Chebyshev-like” functions to achieve desired filter performance under physical limitations. By exploiting the redundant restrictions on exact equal-ripple response, the reflection zeros can be moved to the complex plane, thus forming the “Chebyshev-like functions.” A class of inline filters with a block of second-order dangling resonators is synthesized, which can generate a pair of symmetric transmission zeros (Tzs) but is considered unrealizable using standard Chebyshev functions. With the proposed theories, an accurate and much improved filter prototype is directly derived from the “Chebyshev-like” polynomials, avoiding additional optimization in the design process. For verification, a group of examples with synthesis results are elucidated. Eight ten-pole filters with four Tzs are synthesized and fabricated. The simulated and measured results demonstrate the effectiveness and application of the proposed theories.

Chebyshev approximation Chebyshev polynomials Computer-aided design (CAD) coupling matrix (CM) Couplings filter synthesis Microwave theory and techniques Passband pseudoelliptic filters. Redundancy Resonators Topology

SCI ; EI

英语

其他

WOS:000704110700017

20213010674846

Polynomials ; Redundancy ; Wave filters

Electric Filters:703.2 ; Algebra:921.1

ENGINEERING

2-s2.0-85110883687

Scopus

1.Department of Electronic Engineering, The Chinese University of Hong Kong, Hong Kong.
2.Key Laboratory of Intelligent Perception and Image Understanding of Ministry of Education, School of Artificial Intelligence, Xidian University, Xi'an 710071, China (e-mail: yangw@link.cuhk.edu.hk)
3.Department of Electrical and Electronic Engineering, Southern University of Science and Technology, Shenzhen 518055, China (e-mail: ymyang@xidian.edu.cn)
4.Huawei Technologies Company, Shenzhen 518129, China.

Zeng，Yi,Yang，Yimin,Wu，Yang,et al. Exploiting Redundancy in Direct Synthesis for Inline Filters[J]. IEEE TRANSACTIONS ON MICROWAVE THEORY AND TECHNIQUES,2021,69(10):4489-4498.

Zeng，Yi,Yang，Yimin,Wu，Yang,Yu，Ming,Peng，Jie,&Liang，Dan.(2021).Exploiting Redundancy in Direct Synthesis for Inline Filters.IEEE TRANSACTIONS ON MICROWAVE THEORY AND TECHNIQUES,69(10),4489-4498.

Zeng，Yi,et al."Exploiting Redundancy in Direct Synthesis for Inline Filters".IEEE TRANSACTIONS ON MICROWAVE THEORY AND TECHNIQUES 69.10(2021):4489-4498.