Open AccessDual‐band balun with flexible frequency ratios
Author(s) -
Li Shen Andres,
Zhou Mi,
Arigong Bayaner,
Shao Jin,
Ren Han,
Ding Jun,
Zhou Rongguo,
Zhang Hualiang
Publication year - 2014
Publication title -
electronics letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.375
H-Index - 146
eISSN - 1350-911X
pISSN - 0013-5194
DOI - 10.1049/el.2014.1110
Subject(s) - balun , dual (grammatical number) , multi band device , electrical engineering , electronic engineering , materials science , acoustics , computer science , physics , engineering , antenna (radio) , art , literature
A novel dual‐band balun is presented. The designed 3‐port balun is based on a 4‐port structure with the fourth port terminated as an open end. Being a 4‐port symmetrical network, even–odd‐mode analysis is used to analyse the balun's performance. Based on the derived explicit design equations, a balun is designed to operate at 1.1 and 2 GHz. Numerical simulations show a low reflection coefficient S 11 , equal magnitude of −3 dB as well as 180° phase difference at the output ports. To validate the theoretical and numerical simulations, the proposed balun is fabricated on the FR4 Isola printed circuit board and measurement results match well with the design theory.