科研之友
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摘要
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 bonds. 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.
- 出版日期2008-4
