A Imaging System based on Two Bands RF Mixer and Output Multiplier in One Stage at 340GHz and 170GHz

This paper introduces a design of a novel FMCW imaging system, working at bands of 170GHz and 340GHz at the same time. This FMCW imaging system can be used in zero-IF and super-heterodyne system. This method can reduce the half of local oscillator source of the system. There are two key components in the transmitter and receiver, including two bands output multiplier and two bands RF mixer. The last stage multiplier in transmitter includes quadrupler at 340GHz and doubler at 170GHz. The last stage in receiver includes sub- and 4
^th_
harmonic mixer. For experimental verification, there are four DUT modules: 170GHz and 340GHz two bands output passive network, 4-Octave CSMRs low pass filter (LPF), multiplier and mixer module. Output passive network results are S11 at 150GHz-185GHz and S11 at 306-355 GHz, and two ports isolation is better than 30dB. The transmitter peak power is more than 1 mw@340 GHz and 6mW@170 GHz. The receiver conversion loss is around -15dB and the bandwidth is more than 30 GHz@170 GHz and 80 GHz@340 GHz.