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281 results on '"Safavi-Naeini, S."'

1. Generation of intense sub-cycle terahertz pulses with variable elliptical polarization.

Author

Ropagnol, X., lsgandarov, E., Chai, X., M. Raeis-Zadeh, S., Safavi-Naeini, S., Reid, M., Blanchard, F., and Ozaki, T.

Subjects
APERTURE antennas, CIRCULAR polarization, ELECTRODES, MEDICAL masks, ANTENNAS (Electronics), TERAHERTZ spectroscopy
Abstract

We demonstrate the generation of intense, sub-cycle terahertz (THz) pulses with variable elliptical polarization and peak fields above 80 kV/cm from large aperture photoconductive antennas using a specific interdigitated structure. The latter is composed of horizontal and vertical electrodes, which allow the generation of two quasi-half-cycle THz pulses with orthogonal polarization. A time delay between the two THz pulses is introduced by a phase delay mask covering only the parts of the antenna with horizontal electrodes. By changing the mask thicknesses, we can control, on demand, the polarization state of the THz pulses from linear polarization through elliptical to circular polarization over a quarter of a THz cycle. [ABSTRACT FROM AUTHOR]

Published
2022
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6. Broadband Single-Mode THz Suspended Silicon-On-Glass Waveguide.

Author

Ranjkesh, N., Gigoyan, S., Amarloo, H., Basha, M., and Safavi-Naeini, S.

Abstract

This letter presents a suspended silicon-on-glass waveguide for broadband single-mode low-loss operation at terahertz frequencies. Measured attenuation constants of the two fabricated waveguides are 0.028 and 0.021 dB/ \lambda 0 (on average) over the operation bandwidths of 420–500 GHz and 500–595 GHz, respectively. The fabrication technique of the waveguide is presented. [ABSTRACT FROM PUBLISHER]

Published
2018
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7. Empirical MIMO beamforming and channel measurements at 57-64 GHz frequencies.

Author

Ahmadi‐Shokouh, J., Rafi, R., Taeb, A., and Safavi‐Naeini, S.

Subjects
MIMO systems, BEAMFORMING, DIGITAL signal processing, WIRELESS communications, DATA transmission systems
Abstract

In this paper, we employ a 4-port Agilent PNA-X network analyzer with the expansion modules to measure a 2 × 2 multi-input multi-output (MIMO) propagation channel at 57-64 GHz frequency band. Moreover, we investigate on the beamforming capabilities of the millimetre-wave (MMW) MIMO system. For both aforementioned architectures, that is, regular MMW MIMO and MMW MIMO with beamforming, the Shanon capacity criterion is used to evaluate the performance in terms of data transmission rate. The results reveal that we have a remarkable data rate gain due to MIMO transmission and even more when this MIMO is equipped with beamforming capabilities. Copyright © 2014 John Wiley & Sons, Ltd. [ABSTRACT FROM AUTHOR]

Published
2015
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8. A cost-effective radar system for automotive powertrain control applications.

Author

Beg, C., Vajedi, M., Nezhad-Ahmadi, M. R., Azad, N. L., and Safavi-Naeini, S.

Abstract

This paper describes a new and unique merger of radar technology to automotive powertrain control systems, in particular, with the goal of increasing fuel efficiency in hybrid electric vehicles. The power management system can make more intelligent decisions impacting fuel consumption and emissions if it has knowledge of objects surrounding the vehicle. Furthermore, this paper proposes a scheme for creating a cost effective radar sensor. Discussed in detail is how such a system capable of providing the necessary information for powertrain control applications may be designed specifically to minimize cost and complexity. Finally, an evaluation and prototyping platform consisting of both hardware and software is described, which allows for evaluation and verification of the design tradeoffs. The same platform will also provide the future possibility of the powertrain control algorithm verification on the road as a later step of this research. [ABSTRACT FROM PUBLISHER]

Published
2012
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