Abstract
This work, for the first time to our best knowledge, presents a W-band multi-channel frequency-modulated continuous-wave (FMCW) radar system on low-cost FR-4 substrates. A center-fed patch array antenna on an FR-4 substrate can achieve a maximum gain of 10.8 dBi. It is enabled by aperture coupled feeding using an on-chip feeder implemented on a CMOS radar transmitter (Tx) and receiver (Rx). The proposed radar system consists of one Tx and four Rx channels placed in the back cavity of a microstrip array antenna like an active array antenna system. Additionally, Tx and Rx chipsets include a wideband frequency multiplier with high multiplication ratio of 63, making it easy to distribute reference FMCW waveform synthesized at a very low frequency about 1.25 GHz for 79 GHz output using direct digital synthesis (DDS). Extending the number of channels and implementing various waveforms can be easily accomplished with very good phase noise. The functionality of the proposed radar system on low-cost substrates is confirmed by distance and angle measurements.
Highlights
T HE use of mm-wave radars for civil and commercial applications has increased due to improvements of lowcost silicon semiconductor technology with mass production capability and good yield
The series patch array antenna on FR-4 substrate is directly fed from the backside through aperture coupling by on-chip feeders on Tx and Rx chips developed in the previous work [5]
The proposed radar system was installed at a height of 80 cm from the ground and a trihedral corner reflector (SAGE Millimeter SAJ-043-S1) with a radar crosssection of 10.4 dBsm at 80 GHz was used as a target
Summary
JUN-SEONG KIM1, (Student Member, IEEE), HYUN-JIN KIM1, (Student Member, IEEE), MIN-GEON SHIN1, (Student Member, IEEE), JAE-HYUN PARK1, (Student Member, IEEE), OH-YUN KWON2, (Student Member, IEEE), REEM SONG3, (Member, IEEE), SUNGHO LEE4, (Member, IEEE), SANGWOOK NAM5, (Senior Member, IEEE), AND BYUNG-SUNG KIM3, (Member, IEEE).
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