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An inline pseudoelliptic self‐packaging substrate integrated suspended line filter with mixed electric and magnetic coupling
Author(s) -
Xia Lei,
Wu Bian,
Xie Hanyu,
Chen Jianzhong,
Cheng Qingsha S.
Publication year - 2020
Publication title -
international journal of rf and microwave computer‐aided engineering
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.335
H-Index - 39
eISSN - 1099-047X
pISSN - 1096-4290
DOI - 10.1002/mmce.22281
Subject(s) - resonator , filter (signal processing) , coupling (piping) , inductive coupling , admittance , substrate (aquarium) , line (geometry) , materials science , coupling coefficient of resonators , acoustics , optoelectronics , physics , electrical engineering , electrical impedance , engineering , mathematics , oceanography , geometry , quantum mechanics , geology , metallurgy
A novel compact and self‐packaging inline pseudoelliptic filter is proposed. The proposed filter exploits controllable mixed electric and magnetic coupling using substrate integrated suspended line (SISL) technology. Based on a synchronously tuned coupled resonator circuit with parallel LC resonant tank and admittance inverters, general formulas for extracting electric and magnetic coupling coefficients are derived. Meanwhile, a basic mixed coupled SISL resonator pair is investigated and a systematic design procedure of a second‐order mixed coupled SISL filter is also given. Two prototypes of the second‐order filter with one transmission zero (TZ) at either upper or lower stopband are designed, which is corresponding to either magnetic or electric coupling dominant case. Furthermore, for asynchronously tuned coupled resonator cases, an inline third‐order pseudoelliptic SISL filter characterized by symmetric TZs is designed, fabricated, and measured for validation. The simulated and measured results show a good agreement with the synthesized ones.