Dual-band baluns for reducing the influence of feed cable in antenna measurement

✍ Scribed by Ching-Wen Hsue; Yi-Chia Lin; Kuo-Lung Chen

• Book ID: 102949812
• Publisher: John Wiley and Sons
• Year: 2008
• Tongue: English
• Weight: 506 KB
• Volume: 50
• Category: Article
• ISSN: 0895-2477
• DOI: 10.1002/mop.23270

✦ Synopsis

Abstract

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