Channel Measurements in Lecture Room Environment at 300 GHz

Zantah, Yamen; Sheikh, Fawad; Abbas, Ali Alhaj; Alissa, Mai; Kaiser, Thomas

doi:10.1109/iwmts.2019.8823666

Cited by 32 publications

(17 citation statements)

References 13 publications

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“…The dynamic range defines the maximum sensing range and it highly depends on the intermediate frequency (IF) bandwidth B w . For ZC330, the impact on the dynamic range for different IF filter B w is shown in [30]. For Band 7, Virginia Diodes spectrum analyzer extender (SAX)-VDI Model: WR1.0SAX-M is used with a dynamic range of around 90-100 dB [31].…”

Section: ) Frequency Extendersmentioning

confidence: 99%

Short-Range SAR Imaging From GHz to THz Waves

et al. 2021

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Synthetic aperture radar (SAR) is a well-known imaging technique and most commonly used up to the microwave frequency spectrum (below 30 GHz) which provides spatial resolution in the sub-m range. To enhance the resolution, higher frequency spectra such as millimeter-wave (mmWave) and terahertz (THz) regions are being investigated. The mmWave and THz spectral ranges extend the SAR applications to nondestructive testing (NDT), material characterization, and sub-mm resolution imaging. However, the higher frequency spectrum suffers from higher path loss and potentially higher atmospheric absorption that limits the propagation distance. Nevertheless, the mmWave/THz spectrum is suitable for short-range applications such as indoor room profiling. From theoretical analysis, it can be summarized that the higher frequency spectrum provides better resolution but a comparative study on the impact on the image quality of the frequency spectrum ranging from GHz to THz has not been presented. Besides, as of the hardware complexity of the THz devices, the optimum range of the spectrum is always under investigation. The optimum range is defined where no strong improvements in the image quality are achievable with further increases in the frequency spectrum. Therefore, this paper presents an overview of electronics-based imaging using the SAR technique for the frequency spectrum ranging from GHz to THz with the focus on NDT and high-resolution imaging. Seven frequency bands: 5-10 GHz, 68-92 GHz, 75-110 GHz, 0.122-0.168 THz, 0.22-0.33 THz, 0.325-0.5 THz, and 0.85-1.1 THz are selected for a comparative analysis. The results are presented for 2D and 3D imaging using the backprojection algorithm. Additionally, state-of-the-art imaging based on SAR technique with electronics transceiver modules has only been demonstrated up to the sub-0.75 THz, whereas in this paper the spectrum up to 1.1 THz has been addressed.INDEX TERMS GHz and THz comparison, high-resolution imaging, non-destructive testing, synthetic aperture radar, terahertz imaging, radar imaging.This article has been accepted for inclusion in a future issue of this journal. Content is final as presented, with the exception of pagination.

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Section: ) Frequency Extendersmentioning

confidence: 99%

Short-Range SAR Imaging From GHz to THz Waves

et al. 2021

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“…Moreover, a short-range channel measurement experiment in 275-325 GHz was conducted in [121], and a THz channel measurement for kiosk applications by using a vector network analyzer was presented in [122]. Besides, there are also some more experiments to analyze and validate THz channel models in [123][124][125][126][127][128].…”

Section: Experiments and Simulatormentioning

confidence: 99%

THz channel modeling: Consolidating the road to THz communications

Liu

Guo

et al. 2021

China Commun.

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For the sake of meeting the demand of data rates at terabit (Tbit) per second scale in future networks, the terahertz (THz) band is widely accepted as one of the potential key enabling technologies for next generation wireless communication systems. With the progressive development of THz devices, regrading THz communications at system level is increasing crucial and captured the interest of plenty of researchers. Within this scope, THz channel modeling serves as an indispensable and fundamental element. By surveying the latest literature findings, this paper reviews the problem of channel modeling in the THz band, with an emphasis on molecular absorption loss, misalignment fading and multipath fading, which are major influence factors in the THz channel modeling. Then, we focus on simulators and experiments in the THz band, after which we give a brief introduction on applications of THz channel models with respects to capacity, security, and sensing as examples. Finally, we discuss some key issues in the future THz channel modeling.

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“…Earlier experiments [2], [27]− [29] have been limited to desktop scenario of up to one meter relying on lineof-sight (LoS) conditions. In our previous experiment [1], the line-of-sight channel measurements have been presented in the frequency range (300−310) GHz at 5 m distance. Nevertheless, the aforementioned studies are not conducted in NLoS scenarios.…”

Section: Ray Tracing Simulationsmentioning

confidence: 99%

“…F ACT that many radio scientists around the globe are interested in THz regime (0.3-4 THz) for wireless communications owes to the available overwhelming extreme wide bandwidths that are explicitly attractive for terabit-persecond (Tb/s) wireless applications [1]- [5]. Some of the most anticipated promising 5G applications such as 8K 360 degree videos, vehicle-to-everything (V2X) bidirectional communications, and augmented/mixed reality may require in the near future wireless data transmission capacity beyond 100 Gb/s.…”

Section: Introductionmentioning

confidence: 99%

Scattering and Roughness Analysis of Indoor Materials at Frequencies from 750 GHz to 1.1 THz

Sheikh

Zantah

Mabrouk

et al. 2021

IEEE Trans. Antennas Propagat.

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The problem of wave propagation and scattering at terahertz (THz) frequencies has become increasingly important, in particular for accurate modeling of future indoor wireless communication channels. The reflective properties of indoor materials with different surface roughness and dielectric constants are important to explore diffuse scattering for accurate channel modeling. First and foremost, a THz Swissto12 system is adopted to obtain the first ever transmission measurements for a wide choice of indoor material groups such as wood, plastic and brick at frequencies from 750 GHz to 1.1 THz using up-conversion (frequency-domain) method. Both the reflection (S 11 , S 22 ) and transmission coefficients (S 12 , S 21 ) are measured using this novel and non-invasive electromagnetic technique. The inversion method based on Kramers-Kronig (K-K) relations is then applied to convert the calibrated scatter data into intrinsic material properties (i.e., refractive index, permittivity, absorption coefficient). Then, the surface topography of rough material samples is acquired using surface measurement instruments. Further, the optically smooth (σ h /λ ≪ 1) materials are assorted as most to least rough based on Rayleigh roughness factor. Lastly, the ray tracer considering the Rayleigh-Rice (R-R) scattering model is employed to obtain the maximum achievable reflected paths of the above mentioned indoor material samples at 300 GHz followed by their experimental validation.

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Channel Measurements in Lecture Room Environment at 300 GHz

Cited by 32 publications

References 13 publications

Short-Range SAR Imaging From GHz to THz Waves

Short-Range SAR Imaging From GHz to THz Waves

THz channel modeling: Consolidating the road to THz communications

Scattering and Roughness Analysis of Indoor Materials at Frequencies from 750 GHz to 1.1 THz

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