On the accuracy of Friis' transmission formula at short range

Breinbjerg, Olav; Kaslis, Kyriakos

doi:10.23919/ursigass.2017.8105036

Cited by 8 publications

(2 citation statements)

References 1 publication

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“…Table IV shows the calculation of the RSSI level power for a dBm value. Here, the Friis transmission formula used to calculate the RSSI level versus distance is [28]: The plotted RSSI level identifies the maximum distance to reach the smart weight scale where the wearable device that ranges as far as 1.649 meters has the RSSI level power value of -95.2127 dBm, as shown in Fig. 11.…”

Section: B Rssi Level Test Resultsmentioning

confidence: 99%

Design and Implementation of The Smart Weighing Precision Livestock Monitoring Technology based on the Internet of Things (IoT)

Kushartadi,

Laagu,

Asvial

2023

Int. J. Adv. Sci. Eng. Inf. Technol.

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The traditional approach to weight measurement, which measures each sheep individually, is time-consuming, and sometimes, human error triggers other issues, such as data validation, sheep classification, etc. Most farmers or breeders nowadays still manage their livestock traditionally, which is inefficient. We proposed that the Livestock Live Monitoring System is designed to collect measured data in real-time and display data in graphics; these models combine Bluetooth Low Energy as a wearable sensor to identify animals and Smart Weight Measurement to deliver weight and health data to the cloud system. This system aims to measure livestock and store the data in the server application so livestock monitoring can be done in real-time and remotely. The technology used in this system is ESP32, Load Cell, Bluetooth Low Energy, and Message Queue Telemetry Transport Protocol. Wearable devices act as an identification tag for livestock, and a smart weight scale is used to weigh the livestock and integrate it with the system. Two sheep are used as experiment objects, and their measured weight is compared to their weight when measured traditionally using a conventional scale. Based on the experiment, the weight data measured using the system has an accuracy of 99.82% for sheep number 1 and 99.17% for sheep number 2. This proposed system provides many benefits, including real-time livestock monitoring, cost efficiency, and an efficient feeding system for sheep using weight data.

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Section: B Rssi Level Test Resultsmentioning

confidence: 99%

Design and Implementation of The Smart Weighing Precision Livestock Monitoring Technology based on the Internet of Things (IoT)

Kushartadi,

Laagu,

Asvial

2023

Int. J. Adv. Sci. Eng. Inf. Technol.

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“…The near‐field region is considered with space, lies within the Fraunhofer's distance; whereas far‐field region lies outside of Fraunhofer's distance, respectively. For transmitter and receiver antenna in the far‐field free space, power propagation at receiver side is expressed with the understanding of Friis transmission equation . It provides an upper limit for the maximum possible range available for a given transmitted power.…”

Section: Rf Fundamentalsmentioning

confidence: 99%

Microwave antennas—An intrinsic part of RF energy harvesting systems: A contingent study about its design methodologies and state‐of‐art technologies in current scenario

Behera

Meher

Mishra

2020

Int J RF Microw Comput Aided Eng

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With the significant rise of low power embedded devices in various applications of both consumer and commercial usage, the surge for continuous power requirements has initiated promising research toward alternative sources of energy. It includes the domain of wireless power transmission, internet‐of‐things, wireless sensor nodes, machine‐to‐machine, and radio frequency identification. Thus, the overall scope of this review article is to witness microwave antennas and its implementation in RF energy harvesting system through ambient RF signals. For this reason, unified understanding of classical electromagnetism is needed; beginning with the fundamentals of RF transmission and the exploration of concepts such as Fraunhofer's Distance and Friis Transmission Equation. It is followed up by the analogy of dependency of parameters like circuit build‐up, conversion efficiencies and amount of power harvested, which is quite crucial from the rectifier point‐of‐view. For better improvisement in RF energy harvesting systems, five different cases of monopole antennas are explored with reflector surfaces such as PEC (perfect electrical conductor) and AMC (artificial magnetic conductor) integrated with the rectifier circuit. Implementation with wide diversity has proposed a generalized solution for achieving tradeoffs: polarization and pattern diversity with consistent system efficiency; leads to clean and sustainable energy for low power‐embedded devices.

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Novel Wireless-Power-Transmission (WPT) Model Based on a Bi-Characteristic-Impedance Transmission Line (BCITL)

Torrungrueng

Phaebua

Lertwiriyaprapa

et al. 2022

2022 International Electrical Engineering Congress (iEECON)

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On the accuracy of Friis' transmission formula at short range

Cited by 8 publications

References 1 publication

Design and Implementation of The Smart Weighing Precision Livestock Monitoring Technology based on the Internet of Things (IoT)

Design and Implementation of The Smart Weighing Precision Livestock Monitoring Technology based on the Internet of Things (IoT)

Microwave antennas—An intrinsic part of RF energy harvesting systems: A contingent study about its design methodologies and state‐of‐art technologies in current scenario

Novel Wireless-Power-Transmission (WPT) Model Based on a Bi-Characteristic-Impedance Transmission Line (BCITL)

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