An Improved Antenna Group Delay Measurement Method Using a Three-antenna Extrapolation Technique

Lin, Haoyu; Song, Zhenfei; Wang, Xuetian; Gao, Hongmin

doi:10.13164/re.2017.0675

Cited by 8 publications

(1 citation statement)

References 19 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The impact of the antenna's group delay (GD) on the image quality is analyzed while excluding the antenna's gain to separate one imperfection from the other. GD analysis of antennas has been studied in other areas, such as ultrawideband antennas for communication systems [17]- [20] and GPS applications [21]- [24]. Usual radar calibration methods utilize reference measurements of targets to characterize and compensate for the phase and amplitude imperfections in single-channel [4], [5] and multiple-input and multiple-output (MIMO) radar systems, where phase differences and mutual coupling between antennas become important [25]- [33].…”

Section: Introductionmentioning

confidence: 99%

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

Wittemeier

Sievert

Dedic

et al. 2022

IEEE Microw. Wireless Compon. Lett.

View full text Add to dashboard Cite

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.

show abstract

Section: Introductionmentioning

confidence: 99%

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

Wittemeier

Sievert

Dedic

et al. 2022

IEEE Microw. Wireless Compon. Lett.

View full text Add to dashboard Cite

show abstract

Implementation of slow wave characteristics in a microstrip antenna and its implementation with substrate integrated waveguide

Khandelwal

2019

Int J RF Microw Comput Aided Eng

View full text Add to dashboard Cite

An antenna group delay measurement method based on three‐antenna extrapolation and least residual error curve fitting technique

Lin

Song

Wang

et al. 2018

Micro & Optical Tech Letters

Self Cite

View full text Add to dashboard Cite

This article presents an antenna group delay (GD) measurement method based on the three‐antenna extrapolation technique and a least residual error curve fitting. The system GD is measured as a function of distances in an extrapolation range; then the antenna GD is determined together with antenna scattering characteristic (SC) defined by Kerns using GD variation curve fitting according to the measurement model and measured data. Measurement in frequency band of (1575.42 ± 16) MHz for a standard gain horn antenna is given, and the results of the antenna GD and SC at 1575.42 MHz are 2.83 ns and 0.36, respectively. The GD measurement results are with good agreement with our previously developed method, within a difference of 0.05 ns in the whole frequency band, and thus proposed method is cross‐checked. Although the proposed method is a little complicated and time consuming, its unique advantages are still prominent, as the optimization is a general solution for eliminating antenna multiple reflection; and the method can determine the two parameters of antenna GD and SC simultaneously.

show abstract

An Improved Antenna Group Delay Measurement Method Using a Three-antenna Extrapolation Technique

Cited by 8 publications

References 19 publications

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

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

Implementation of slow wave characteristics in a microstrip antenna and its implementation with substrate integrated waveguide

An antenna group delay measurement method based on three‐antenna extrapolation and least residual error curve fitting technique

Contact Info

Product

Resources

About