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A dual-mode ring coupler is proposed for balanced frequency doubler application based on the microstrip technology. The proposed coupler can operate in a quasi-hybrid ring coupler mode and a T-junction power divider/combiner mode at two frequency bands with center frequencies of $f_{0}$ and $2f_{0}$ , respectively. The operating principle is analyzed, and the design procedure is described. To verify the proposed concept, a 3-/6-GHz dual-mode ring coupler is developed and fabricated. Measured results demonstrate that the proposed coupler achieves good performances with bandwidths up to 20% at both lower and upper bands. The measurements agree well with the simulations. Finally, as an application demonstration of our proposed dual-mode coupler, a 19-/38-GHz balanced frequency doubler based on this structure is also designed and fabricated. Measured results show that the conversion loss of the fabricated multiplier is less than 8.9 dB with the input frequency ranging from 17 to 21 GHz, and the minimum conversion loss is 7.3 dB at 19 GHz. [ABSTRACT FROM AUTHOR]

This letter presents a low cost dual-mode frequency multiplier that achieves a frequency doubler and tripler simultaneously with high performance. A five-port ring coupler is employed for the dual-mode frequency multiplier application. The operating principle of the dual-mode frequency multiplier is described and analyzed. Based on it, a 10–20/30 GHz multiplier is designed and fabricated. Measured results demonstrate that the conversion loss of the doubler and tripler is 10–12.5 and 20.4–23.6 dB, respectively, within the input frequency range from 9 to 10.8 GHz. [ABSTRACT FROM AUTHOR]