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An analytical design method for a novel dual‐band filtering DC‐block impedance transformer
Author(s) -
Sun Shaopu,
Wu Yongle,
Jiao Lingxiao,
Liu Yuanan
Publication year - 2018
Publication title -
microwave and optical technology letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.304
H-Index - 76
eISSN - 1098-2760
pISSN - 0895-2477
DOI - 10.1002/mop.30937
Subject(s) - quarter wave impedance transformer , electrical impedance , passband , transformer , electronic engineering , image impedance , impedance matching , impedance parameters , multi band device , acoustics , mathematics , control theory (sociology) , engineering , physics , damping factor , band pass filter , electrical engineering , computer science , voltage , antenna (radio) , control (management) , artificial intelligence
In this paper, a dual‐band impedance transformer with filtering integration and DC‐block function is proposed for the first time. Excellent frequency selectivity is achieved by the dual‐narrowband filtering integration with two pairs of transmission zeros (TZs) at both sides of the dual passband. Using transmission‐line theory and even‐/odd‐mode analysis method, the design theory and equations are demonstrated analytically. Furthermore, the relationship between terminal impedance ratios and operating frequency ratios is analyzed, and arbitrary impedance ratios and frequency ratios can be obtained in the given constrained region. Based on a simple design flow, two examples with the same frequency ratio 1.9 but different terminal impedance ratios 1.2 and 1.6 are fabricated and measured for experimental validation. Good agreement between the simulated results and measured ones verifies the presented design method.