Wideband planar log-periodic balun
This paper presents the analysis, design, and performance characteristics of a new planar balun structure. The design is based on the log-periodic antenna theory. The design guidelines, as well as simulation and measured results, are presented. It is shown that the new balun has greater than one octave bandwidth. A comparison to the half-wave balun is also included. The log-periodic balun will find applications in wireless communication circuits or devices such as mixers, amplifiers, and antennas. (C) 2001 John Wiley & Sons, Inc.
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