@conference{re2019millimeter,
title = {Millimeter-Wave FMCW Radar Development using SIW Butler Matrix for Time Domain Beam Steering},
author = {Pascual Hilario Re and Cristian Alistarh and Symon Podilchak and George Goussetis and John Thompson and Jaesup Lee},
url = {https://secureservercdn.net/160.153.138.71/hhy.95a.myftpupload.com/wp-content/uploads/2020/01/08904552.pdf},
year = {2019},
date = {2019-01-01},
booktitle = {2019 16th European Radar Conference (EuRAD)},
pages = {141--144},
organization = {IEEE},
abstract = {One possible limitation for automotive collision avoidance radar applications is unwanted antenna beam squint- ing over frequency. To circumvent this problem, this paper studies a novel K-band automotive radar that improves trans- mitted power distribution over the horizontal plane using a substrate-integrated waveguide (SIW) 4x4 Butler matrix (BM) beamforming network. The 24 GHz system, which is scalable to 77 GHz, uses frequency modulated continuous-wave (FMCW) transmission and scans the horizontal plane by switching the four input ports of the BM in time. The radar system has been calibrated and measured in an anechoic chamber and angular target position estimates have been completed using digital beamforming. These tests are also compared to a more conventional single-input multiple-output (SIMO) and multiple- input multiple-output (MIMO) FMCW radar configurations and it is shown that the proposed BM radar offers improvements in terms of higher return powers, improved signal-to-noise ratios, and enhanced field-of-view.},
keywords = {},
pubstate = {published},
tppubtype = {conference}
}

@conference{Alistarh_ANTEM_2018,
title = {Spectral Smoothing by Multiple Radar Pattern Multiplication for Improved Accuracy},
author = {Cristian A. Alistarh and Symon K. Podilchak and George Goussestis and John S. Thompson and Jaesup Lee},
url = {https://secureservercdn.net/160.153.138.71/hhy.95a.myftpupload.com/wp-content/uploads/2019/02/Antem_paper_2018_v182.pdf},
year = {2018},
date = {2018-08-18},
publisher = { International Symposium on Antenna Technology and Applied Electromagnetics (ANTHEM) },
address = { Waterloo, Canada},
organization = {University of Waterloo},
abstract = {This paper presents a novel technique for improving radar accuracy. In particular, by studying the product of multiple radar beam pattern spectrums from different radar sub-module views, a refined and improved total radar response can be obtained. We examine this radar signal processing approach using a 24GHz frequency-modulated continuous wave (FMCW) radar system equipped with broadband 1.5GHz substrate integrated waveguide (SIW) antenna arrays to ensure high range resolution.The transmitter is defined by 4 sawtooth signals generated by separated radar sub-modules, each having a multiple input multiple output (MIMO) configuration with 4 receivers at each radar sub-module. The measured spectral multiplication of the individual radar sub-modules results in a signal quality improvement of more than 10dB when compared to a MIMO radar configuration with the same architecture.},
keywords = {},
pubstate = {published},
tppubtype = {conference}
}

@conference{abb00e85a3b4427f95a63bf20a42d2b0,
title = {Millimetre-Wave FMCW MIMO Radar System Development Using Broadband SIW Antennas},
author = {Cristian Alistarh and Pascual {Hilario Re} and {Thomas M } Strober and Samuel Rotenberg and Symon Podilchak and Carolina Mateo-Segura and Yan Pailhas and George Goussetis and Yvan Petillot and {John S } Thompson and Jaesup Lee},
url = {https://secureservercdn.net/160.153.138.71/hhy.95a.myftpupload.com/wp-content/uploads/2019/02/EuCAP2018_v15_final_submission7.pdf},
year = {2018},
date = {2018-01-01},
booktitle = {2018 12th European Conference on Antennas and Propagation (EUCAP)"},
abstract = {In this paper, a novel automotive radar is presented.The system uses frequency modulated continuous-wave (FMCW)transmission based on multiple input multiple output (MIMO)substrate-integrate waveguide (SIW) antennas operating in theK-band regime. The continuous sawtooth time-domain wavetransmitted from two SIW antennas by time-domain multipleaccess (TDMA) is detected with a half-lambda spaced fourelement SIW array at a distance of 4m in the calibrated anechoicchamber and verified with Simulink models. The high bandwidthand omnidirectionality of SIW antennas in the horizontal planetogether with digital-beamforming for MIMO virtual arrays offerthe system an overall field of view of 130 degrees while keepinga half power beamwidth of 14 degrees at a cost of using only 6transmitter and receiver elements in total.},
keywords = {},
pubstate = {published},
tppubtype = {conference}
}