A broadband GaAs MMIC frequency doubler on left-handed nonlinear transmission lines

摘要

A broadband frequency doubler using left-handed nonlinear transmission lines (LH NLTLs) based on MMIC technology is reported for the first time. The second harmonic generation on LH NLTLs was analyzed theo-retically. A four-section LH NLTL which has a layout of 5.4 x 0.8 mm~2 was fabricated on GaAs semi-insulating sub-strate. With 20-dBm input power, the doubler obtained 6.33 dBm peak output power at 26.8 GHz with 24-43 GHz —6 dBm bandwidth. The experimental results were quite consistent with the simulated results. The compactness and the broad band characteristics of the circuit make it well suit for GaAs RF/MMIC application.