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Two robust millimeter-wave microstrip-to-waveguide transitions are proposed in this paper. The central operating frequency is 77 GHz, for collision-avoidance radar applications. The microstrip line has been first transformed into an air-filled rectangular waveguide whose height is equal to the substrate thickness. Then, a conventional multisection lambda/4 transformer has been used in the first transition,...
This paper presents two six-port 77 GHz FMCW collision avoidance radar sensor configurations. The first one uses a six-port double balanced mixer for direct frequency conversion and conventional frequency counting to determine the range and velocity of the target. The second one uses a six-port phase/frequency discriminator. Here velocity and range are determined in the same manner by evaluating the...
A new, low-cost architecture of a 77 GHz automotive phase coded continuous wave radar sensor is proposed to provide accurate velocity and range measurements. Orthogonal signals provided by the multi-port module are combined into an intrinsic Doppler rejection technique, enabling accurate pulse compression. An increased range resolution is achieved using the pulse compression technique, while CW mode...
A low cost millimeter-wave narrowband six-port double-balanced mixer circuit is proposed. Due to the symmetry and specific properties of the six-port, the mixer exhibits very good suppression of harmonic and spurious products. The mid operating frequency is selected to be 77 GHz, which is dedicated to collision avoidance radar for automobile applications. The simulation results show a conversion loss...
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