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Dual‐band baluns for reducing the influence of feed cable in antenna measurement
Author(s) -
Hsue ChingWen,
Lin YiChia,
Chen KuoLung
Publication year - 2008
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.23270
Subject(s) - balun , multi band device , antenna (radio) , microwave , electrical engineering , engineering , coaxial cable , antenna tuner , electronic engineering , electrical impedance , capacitive sensing , equivalent circuit , frequency band , acoustics , physics , radiation pattern , coaxial antenna , telecommunications , voltage , cable gland
In order to obtain accurate radiation characteristics of an antenna, it is required to reduce unbalanced current on the surface of the feeding cable. A miniaturized balun of stacked coaxial cavities is presented to show high input impedances at two separate bands. An equivalent circuit with transmission lines, and inductive and capacitive elements is employed to characterize the circuit behavior of the dual‐band balun. In particular, the method to design a dual‐band balun, with arbitrary ratio of the upper resonant frequency to the lower resonant frequency, is presented to facilitate the design process. Both numerical values and experimental results are presented to illustrate the validity of the design method. © 2008 Wiley Periodicals, Inc. Microwave Opt Technol Lett 50: 1000–1004, 2008; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.23270