94 GHz Waveguide VCO for FMCW radar

Abstract

In this paper, we designed and fabricated waveguide voltage controlled oscillator (VCO), which have a center frequency of 94 GHz using the GaAs Gunn diode, varactor diode, and two bias posts with low pass filter (LPF). The cavity is designed for fundamental mode at 47 GHz and operated second harmonic VCO of 94GHz center frequency. The fabricated VCO has 1.74 GHz bandwidth, 671MHz linearity for 2.28% and 14 dBm output power. The highest output power is 15.58dBm at 94.38 GHz

94 GHz waveguide VCO using InP Gunn diode for FMCW radar applications

“…The waveguide delivers the harmonic frequency and this output power is optimized using an adjustable back-short. Maximum power is achieved by a back-short position [7]. The upper cavity has two bias posts which are Gunn and varactor biases with LPF.…”