The Impact of Group Delay Dispersion on Radar Imaging With Multiresonant Antennas

Radar sensing has become very popular over the last two decades, and research has focused on high-bandwidth and high-resolution systems. Due to the steadily increasing center frequency of front-end circuits, on-chip antennas are the preferred choice over PCB antennas and horn antennas when frequenci...

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Bibliographic Details
Published in:IEEE microwave and wireless components letters 2022-03, Vol.32 (3), p.241-244
Main Authors: Wittemeier, Jonathan, Sievert, Benedikt, Dedic, Muhamed, Erni, Daniel, Rennings, Andreas, Pohl, Nils
Format: Article
Language:English
Subjects:
Algorithms
Angular resolution
Antenna measurements
Antennas
Antennas theory and design
array
B11HFC
Bandwidths
Delays
Dispersion
Group delay
group delay (GD)
Horn antennas
Intermediate frequencies
millimeter wave (mmWave)
multiresonant
patch antenna
Radar
Radar antennas
Radar arrays
Radar equipment
Radar imaging
Radar systems
silicon–germanium (SiGe)/Si technologies
System-on-chip
terahertz (THz)
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Summary:Radar sensing has become very popular over the last two decades, and research has focused on high-bandwidth and high-resolution systems. Due to the steadily increasing center frequency of front-end circuits, on-chip antennas are the preferred choice over PCB antennas and horn antennas when frequencies get close to THz. However, conventional on-chip antennas are severely limited in bandwidth, leading to increased use of wideband and multiresonant on-chip antennas. Besides a more complex design process of multiresonant antennas, they have the disadvantage of a nonconstant dispersive group delay (GD). This reduces the resolution of sensing systems, such as the range resolution and angular resolution of a radar system. In this work, we show how GD affects the imaging properties of a radar system. The measured S-parameter data from a 240-GHz multiresonant antenna are used to generate synthetic intermediate frequency (IF) signals of a rectangular array. Subsequently, simulated 3-D radar images are generated using the backprojection algorithm. These images are compared with those of a nondispersive imaging system. Finally, two compensation methods using a phase correction method and an all-pass filter are explained, and their performance is compared.
ISSN:1531-1309
2771-957X
1558-1764
2771-9588
DOI:10.1109/LMWC.2021.3128281