Vol. 135

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2013-01-11

Directional Coupler with Good Restraint Outside the Passband and its Frequency-Agile Application

By Yu Jian Cheng, Lei Wang, Jie Wu, and Yong Fan
Progress In Electromagnetics Research, Vol. 135, 759-771, 2013
doi:10.2528/PIER12121009

Abstract

In this paper, a directional coupler incorporating the bandpass frequency response characteristic is proposed and characterized. This structure is modified from a conventional branch-line coupler. Two wide open-ended coupled lines are used instead of microstrip branch lines. As such, good restraint performance outside the passband can be achieved. The even-odd mode technique is employed to analyze and synthesize such a coupler. After that, frequency tuning is achieved by modifying the electrical length of the open-ended coupled lines with varactors. Measured results validate the correctness of our theory and design.

Citation


Yu Jian Cheng, Lei Wang, Jie Wu, and Yong Fan, "Directional Coupler with Good Restraint Outside the Passband and its Frequency-Agile Application," Progress In Electromagnetics Research, Vol. 135, 759-771, 2013.
doi:10.2528/PIER12121009
http://jpier.org/PIER/pier.php?paper=12121009

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