A Compact Size Ka Band pHEMT MMIC Frequency Tripler with CPW Technology

This paper presents an novel configuration of balanced frequency InGaAs pseudomorphic high electron mobility transistor (PHEMT) monolithic microwave integrated circuit (MMIC) tripler with Ka-band output frequency (39 GHz). A resonant LC filter is used to eliminate the fundamental frequency and a phase delay line is employed to suppress the second harmonic. By using a class B transistor bias point and carefully selecting its input and output terminations, a conversion loss of 16.36 dB for an 10 dBm input signal have been obtained. As compared to the third-harmonic frequency, the second harmonic is more than 28.1 dB at 39 GHz. It is very useful for applications in the wireless communication and radar systems.