Submillimeter-Wave Frequency Scanning System for Imaging Applications

Álvarez, Yuri; Camblor, R.; Garcia, Cebrian; Laviada, Jaime; Vázquez, C.; Hoeye, S. Ver; Hotopan, George; Fernández, M.; Hadarig, Andreea; Arboleya, Ana; Las-Heras, Fernando

doi:10.1109/tap.2013.2275747

Cited by 42 publications

(17 citation statements)

References 21 publications

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“…When a chirped signal is transmitted, the mainlobe direction continuously changes during the pulse. This effect has been used for imaging radars where a mechanical antenna rotation would not be possible [50]- [53]. In the case of KAPRI the beam squint is undesired: the large angular deviation relative to the beamwidth causes the mainlobe to be centered on a scatterer during a fraction of t chirp only, decreasing the effective transmitted bandwidth and worsening the range resolution.…”

Section: B Beam Squint Correctionmentioning

confidence: 99%

Polarimetric Calibration of the Ku-Band Advanced Polarimetric Radar Interferometer

Baffelli

Frey

Werner

et al. 2018

IEEE Trans. Geosci. Remote Sensing

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Abstract-Differential interferometry using groundbased radar systems permits to monitor displacements in natural terrain with high flexibility in location, time of acquisition and revisit time. In combination with polarimetric imaging, discrimination of different scattering mechanisms present in a resolution cell can be obtained simultaneously with the estimation of surface displacement. In this paper we present the pre-processing steps and the calibration procedure required to produce high-quality calibrated polarimetric single-look complex imagery with KAPRI, a new portable Ku-band polarimetric radar interferometer. The processing of KAPRI data into SLC images is addressed, including the correction of beam squint and of azimuthal phase variations. A polarimetric calibration model adapted to the acquisition mode is presented and used to produce calibrated polarimetric covariance matrix data. The methods are validated by means of a scene containing five trihedral corner reflectors. Data pre-processing is assessed by analyzing the oversampled response of a corner reflector and the polarimetric calibration quality is verified by computing polarimetric signatures and residual calibration parameters.

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Section: B Beam Squint Correctionmentioning

confidence: 99%

Polarimetric Calibration of the Ku-Band Advanced Polarimetric Radar Interferometer

Baffelli

Frey

Werner

et al. 2018

IEEE Trans. Geosci. Remote Sensing

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“…Hence, the beam direction can be steered by sweeping the operating frequency. Although frequency-scanning is used in sensing/radar applications [12]- [15] it is not a desirable feature in modern communication systems, which usually require pattern reconfigurability with fixed frequency operation [16], [17].…”

Section: Introductionmentioning

confidence: 99%

Leaky-Wave Antenna With Switchable Omnidirectional Conical Radiation via Polarization Handedness

Liu

Song

et al. 2020

IEEE Trans. Antennas Propagat.

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Reconfigurable antennas capable of beam-steering offer an efficient solution to optimize the use of the crowded wireless medium and can serve as a multifunction antenna. Beam-steering is often achieved by antenna geometry switching at the expense of hardware complexity. Here, polarization is used to realize beam-steering without the need of antenna geometry modification. Depending on the handedness of the feed, backward or forward conical radiation is demonstrated in a ~13λ0-long shortcircuited helically slotted waveguide antenna. Tapering the slit width with a Taylor distribution reduces the measured sidelobe levels by ~3 dB in average and results in a realized gain of 10-13 dB and 11-13 dB for right-handed (backward radiation) and lefthanded circularly polarized (forward radiation) feeding, respectively, in the bandwidth from 8.5 to 9.5 GHz.

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“…Both models use the same shifter based on the four SRR, same dielectric, the distance between elements, and both are design to work at 10 GHz making it very fairly to use in comparison. With technological development, there is a great need for the scanning antennas, which enable tracking of a specific position in space with great accuracy and resolution [12][13][14][15]. In the past, such solutions were predominantly based on a combination of the antenna array and a customized mechanical system for pointing the array at the specific direction.…”

Section: Introductionmentioning

confidence: 99%

Frequency scanning antenna arrays with metamaterial based phased shifters

2019

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This paper presents a simple design of linear series-fed frequency scanning antenna arrays with: (a) identical rectangular dipoles and (b) pentagonal dipoles having different impedances to provide enhanced side lobe suppression. Phase shifters are designed as a metamaterial unit cell consisting of split-ring resonators coupled with the parallel microstrip line. Shifter models variations are described and control of phase is demonstrated. Two antenna arrays are manufactured and measured.

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Submillimeter-Wave Frequency Scanning System for Imaging Applications

Cited by 42 publications

References 21 publications

Polarimetric Calibration of the Ku-Band Advanced Polarimetric Radar Interferometer

Polarimetric Calibration of the Ku-Band Advanced Polarimetric Radar Interferometer

Leaky-Wave Antenna With Switchable Omnidirectional Conical Radiation via Polarization Handedness

Frequency scanning antenna arrays with metamaterial based phased shifters

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