A Novel Dual-Frequency Wilkinson Power Divider with Unequal Power Division

Abstract

An unequal dual-frequency Wilkinson power divider with a novel structure and analytical design method is presented in this article. A new asymmetric structure consisting of a parallel open-circuited transmission line stub and eight sections of transmission lines is proposed, and this structure can satisfy rigorous unequal power division and impedance matching theoretically. Considering that the transmission line stub has the equivalent characteristics of reactive lumped elements (such as inductors and capacitors), a single resistor R is only used in the isolation structure to obtain ideal isolation between two output ports of this proposed unequal dual-frequency power divider. For verification, simulated results of two examples are shown first, and it can be observed that ideal matching at three ports, perfect isolation between two output ports, and accurate unequal power division can be simultaneously achievable at desired two frequencies. Finally, comparison results of simulation and measurement of a practical microstrip example verify this proposed power divider experimentally.

Keywords:

• dual-frequency
• dual-band
• Wilkinson power divider
• unequal

Acknowledgment

The authors want to express their gratitude to the partial financial support of the National High Technology Research and Development Program of China (863 Program, Grant 2008AA01Z211), the Project of Guangdong Province Education Ministry Demonstration Base of Combining Production, Teaching and Research (Grant 2007B090200012), and the National Natural Science Foundation of China (Grant 60736002).