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This paper focuses on the design of frequency doublers operating in the RF and microwave frequency ranges. To reject the fundamental and third harmonic signal over a broadband frequency range, an active balun was employed in the broadband frequency doubler which has resulted in fundamental signal and third harmonics signal rejection better than 12 dB from 12 to 30 GHz input frequency. More than 9...
A new push-pull power amplifier using metamaterial (MM)-based baluns is developed in this paper. To effectively suppress the second harmonics from two power amplifiers in the push-pull circuit configuration, two MM-based baluns with a 79% out-of-phase bandwidth and an amplitude imbalance of 0.67 dB are employed as input and output circuitries. At 1.5 GHz, the developed push-pull power amplifier achieves...
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