Frequency multiplier using diplexer based on composite right/left-handed transmission line

This paper proposes the frequency multiplier using diplexer based on composite right/left-handed (CRLH) transmission line with dual band characteristic. The diplexer is separated the output signals of harmonic generator, which is generated the harmonic signals using nonlinear device. The diplexer consists of the inphase power divider, 0°/90° phase controller and dual-band quadrature hybrid coupler. This sends out the selecting output signals of the harmonic signals and suppresses out of signals. To validate a function of multiplier, the harmonic generator and diplexer with 2 GHz and 3 GHz operating frequency are implemented. As a result, the proposed frequency multiplier operates normally between simulation and measurement.