Tunable dual-mode filtering power divider with harmonic suppression

Abstract

This paper presents a tunable dual-mode filtering power divider (TDFPD) with harmonic suppression. Two tunable dual-mode resonators are embedded into a power divider with equal power ratio to realize the proposed TDFPD. The odd-mode of the dual-mode resonator is rigorously designed to approach its even-mode so that the proposed TDFPD will show a harmonic suppression performance. Tuning elements sharing technology is also utilized to minimize the numbers of varactors. To demonstrate the proposed design, a prototype is designed and fabricated. The measurement shows the TDFPD can be tuned from 2.10 to 2.31 GHz with a return loss better than 15 dB and Harmonic suppression is better than 20 dB at the frequency range of 2.5 to 9 GHz. Good agreements are observed between measured and simulated results.