Analysis of radio wave reflection and transmission characteristics at reinforced concrete slab by numerical simulation and scaled model experiment

Chiba, Hiroki; Miyazaki, Yasumitsu

doi:10.1109/elmagc.1999.801355

Cited by 3 publications

(2 citation statements)

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“…It has been reported that the real and imaginary parts of complex permittivity are positively correlated with the moisture content of the concrete [21]- [23]. We therefore evaluated path losses for concrete beams with low and high content with a complex relative permittivity of 3-j0.1 and 7-j1 [21]- [23].…”

Section: Path Loss Prediction Under Different Beam Conditionsmentioning

confidence: 99%

Prediction Method for Propagation Path Loss Obstructed by Dielectric Material in the 920-MHz Band

Yamamoto,

Sasaki,

Yamamoto

et al. 2023

IEEE Access

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This paper presents a simple calculation method for predicting the propagation path loss of a radio wave passing through a dielectric obstruction between a transmitter (Tx) and receiver (Rx). In this paper, the propagation characteristics of a radio that is obstructed by a concrete beam on a ceiling in a large indoor environment, such as those seen in factories and warehouses, are investigated. The radio frequency is the 920-MHz band, used for Internet-of-Things (IoT) wireless communications in Japan. The proposed calculation method is based on forbidden region (FR) theory, with the radius defined as 0.6 times that of the first Fresnel zone. In our proposed method, a three-wave model in the FR area at an obstructing object between Tx and Rx is considered for predicting the propagation path loss. The model consists of a wave propagating through the air, a wave penetrating the concrete beams, and a wave traveling inside the concrete ceiling. The path losses using the proposed calculation method are in good agreement with those of a Finite Difference Time Domain (FDTD) simulation and the measured data. We conclude that the proposed calculation method effectively predicts the path loss characteristics of radio waves obstructed by a dielectric material, such as a concrete beam on a concrete ceiling. INDEX TERMSIndoor communication, Internet-of-things (IoT), Finite difference time domain (FDTD), Prediction methods, Radio propagation

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Section: Path Loss Prediction Under Different Beam Conditionsmentioning

confidence: 99%

Prediction Method for Propagation Path Loss Obstructed by Dielectric Material in the 920-MHz Band

Yamamoto,

Sasaki,

Yamamoto

et al. 2023

IEEE Access

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“…Hence, it is inferred that static objects in vehicular environment such as buildings, advertisement boards and dense vegetation obstruct the radio signals. Study of impact of reinforced concrete on reflection of radio signals showed that radio signals are obstructed by concrete in 3.5 GHz band [7]. Previous studies [8], [9] have proved the phenomenon that static obstacles block radio signals in VANETs.…”

Section: Introductionmentioning

confidence: 97%

Towards Improving Vehicular Communication in Modern Vehicular Environment

Qureshi

Noor

2013

2013 11th International Conference on Frontiers of Information Technology

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Vehicular Ad Hoc Networks (VANETs) is a challenging field of wireless technology that offers a wide variety of useful applications. These applications span from safety related applications to infotainment services. IEEE 802.11p standard that operates in 5.9 GHz frequency band is widely adopted in VANETs for physical and MAC layers. The radio signals in 5.9 GHz band are less penetrating as compared to Wi-Fi that operates in 2.4 GHz band. Obstacles that impede radio signals have high impact on vehicular communication. Thus, maintaining line-ofsight among communicating vehicles improves vehicular communication. Modern day vehicular environment contains road infrastructure units such as curve roads, flyovers, underpasses, tunnels and irregular roads. The modern road infrastructure units introduce non line-of-sight conditions which result in either costly or no communication. This paper introduces a mechanism to maintain line-of-sight among communicating vehicles while considering modern road infrastructure units. The geometrical concepts are used here to model and formulate the line-ofsight (LOS) conditions in various real world scenarios. We have calculated the relative optimal position of signal repeaters / reflectors for maintaining line-of-sight condition in different road infrastructure units.

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Różnorodność składu betonu i jego wpływ na natężenie pola elektrycznego

Choroszucho

2018

PUT Academic J.: Electrical Engineering

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Analysis of radio wave reflection and transmission characteristics at reinforced concrete slab by numerical simulation and scaled model experiment

Cited by 3 publications

References 0 publications

Prediction Method for Propagation Path Loss Obstructed by Dielectric Material in the 920-MHz Band

Prediction Method for Propagation Path Loss Obstructed by Dielectric Material in the 920-MHz Band

Towards Improving Vehicular Communication in Modern Vehicular Environment

Różnorodność składu betonu i jego wpływ na natężenie pola elektrycznego

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