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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...
This paper describes technologies of miniaturized high-power low-distortion GaAs HBT power amplifiers with a low-voltage operation for mobile terminals used in 5-6 GHz broadband wireless applications. In conjunction with diode-based linearizing techniques, wideband matching network techniques including trap circuits for second harmonics allow us to obtain a compact broadband power amplifier module...
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