Wideband balun using a transmission line transformer

IEICE Electronics Express

Unghee Park¹ 

[1] School of Electronic, Information & Communication, Kangwon University

关键词: balun;    wideband balun;    transmission line transformer;   

DOI  :  10.1587/elex.8.730

学科分类：电子、光学、磁材料

来源: Denshi Jouhou Tsuushin Gakkai

【 摘 要 】

References(7)A wideband balun consisting of a transmission line transformer (TLT) and matching and phase conversion circuits is proposed and fabricated. A TLT using three 37.5-Ω coaxial cables converts the impedance from 50 to 25Ω, and a matching circuit using four resistors from a singly terminated filter improves the matching and isolation characteristics over a four-octave range. A phase conversion circuit is implemented by cross-connecting two coaxial cables. The fabricated balun provides matching (S11, S22) and isolation (S23) characteristics of about -15dB, an output magnitude difference within 0.3dB, and an output phase difference within 180°±1.4° from 62 to 960MHz.

【 授权许可】

Unknown