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A Ka-band multifunctional quadrupler with high harmonic rejection and high output power flatness has been designed, fabricated and measured using GaAs process. The quadrupler is integrated with two amplifiers, two filters, a limiter and a quadrupler in a single chip. Measurement results show that this chip achieves an output power of 16.7 dBm with an input power range from −5 to 1 dBm, in the frequency range of 34–36 GHz. A high output power flatness of ±0.8 dB is demonstrated at all working temperatures. Harmonics in the output spectrum are suppressed by more than 50 dBc. The total chip power consumption is about 130 mA with 5 V bias voltage, occupying an area of 2.26 × 3.26 mm 2 . The proposed MMIC is able to be effectively integrated into a multifunction module for wideband active electronically scanned array or phased array systems.

A millimetre-wave GaAs monolithic multifunctional quadrupler chip with high harmonic rejection and high output power flatness