A radio propagation and fading simulator using radio-frequency acoustic waves in a liquid

1966 ◽  
Vol 54 (8) ◽  
pp. 1072-1072 ◽  
Author(s):  
E.W. Chapin ◽  
W.K. Roberts
Keyword(s):  
Radio Frequency ◽  
Acoustic Waves ◽  
Radio Propagation ◽  
Fading Simulator

EVALUATION OF THE EFFECTIVENESS OF TELECOMMUNICATION SYSTEMS BASED ON RADIO FREQUENCY IDENTIFICATION USING SURFACE ACOUSTIC WAVE TECHNOLOGY

2020 ◽  
Author(s):  
В.В. БУТЕНКО ◽  
А.С. БАГДАСАРЯН ◽  
С.А. БАГДАСАРЯН ◽  
В.И. НИКОЛАЕВ
Keyword(s):  
Radio Frequency ◽  
Radio Frequency Identification ◽  
Acoustic Waves ◽  
Communication Systems ◽  
Surface Acoustic Waves ◽  
Information Access ◽  
Identification System ◽  
Rfid Systems ◽  
Telecommunication Systems ◽  
Frequency Identification

Представлен подход к управлению критически важными процессами с использованием инфокоммуникационных систем и стремительно развивающейся технологии поверхностных акустических волн (ПАВ). Проведен краткий анализ принципов работы,особенностей проектирования,методик расчета и найдены оптимальные решения радиочастотных компонентов на ПАВ для RFID-систем. Выполнен анализ способов повышения эффективности RFID-систем для защиты информации от несанкционированного доступа в телекоммуникационных системах. Разработан метод выбора оптимальной радиочастотной системы идентификации с учетом совокупности количественных показателей ее качества. Обоснованы и формализованы основные показатели комплексной оценки эффективности RFID-систем. Разработана методология выбора оптимальной RFID-системы на основе теории нечетких множеств. An approach to the management of critical processes using info-communication systems and the rapidly developing technology of surface acoustic waves (SAW) is presented. A brief analysis of the principles of operation, design features, calculation methods is carried out, and optimal solutions of radio frequency components based on SAW for RFID systems are found. The analysis of ways to improve the efficiency of RFID systems for information access security in telecommunication systems is performed. A method for choosing an optimal radio frequency identification system has been developed taking into account a set of quantitative indicators of its quality. The main indicators of a comprehensive assessment of the effectiveness of RFID systems are substantiated and formalized. A methodology for choosing the optimal RFID system based on the theory of fuzzy values has been developed.

Survey of Radio Propagation Models for Acoustic Applications in Underwater Wireless Sensor Network

2019 ◽  
Vol 09 ◽  
Author(s):  
Preeti Saini ◽  
Rishi Pal Singh ◽  
Adwitiya Sinha
Keyword(s):  
Acoustic Waves ◽  
Path Loss ◽  
Signal Strength ◽  
Propagation Model ◽  
Propagation Loss ◽  
Radio Propagation ◽  
Propagation Models ◽  
Loss Model ◽  
Path Loss Model ◽  
Radio Propagation Model

Background: Acoustic waves have a large range of applications in UWSNs from underwater monitoring to disaster management, military surveillance to assisted navigation. Acoustic waves are primarily used for wireless communication in water. But radio waves are more suitable than acoustic waves for many underwater applications (e.g. real-time applications, shallow water applications). Objectives: A propagation model is required to effectively design a radio wave based UWSN. Propagation model predicts the average received signal strength at a given distance from the transmitter and the variability of the signal strength in close spatial proximity to a particular location. Various radio propagation models are developed for air. Methods: The performance of RF-EM waves underwater is not the same as that in the air. Many parameters which have real-value in the air becomes complex valued in seawater. Thus, propagation models for air cannot be directly used to calculate propagation loss underwater. Various radio propagation models are developed for water by Al-Shamaa’a et al., Uribe and Grote, Jiang et al., Elrashidi et al., Hattab et al. Each model has some merits and demerits. Path loss model developed by Al-Shamma’a et al. is a simple model based on attenuation only. Results: Uribe and Grote have introduced distance-dependent attenuation coefficient in path loss calculation. Path loss model by Jiang et al. calculates path loss for freshwater. Model by Hattab et al. is specifically designed for UWSN. According to the authors, it is the first path loss model developed for UWSN. Elrashidi et al. have calculated path loss for freshwater and seawater at 2.4 GHz. The model includes the effect of the reflected signals on the received signal by the receiver node. Conclusion: The paper presents a comparative analysis of these various radio propagation models developed for underwater. Among these models, the radio propagation model by Hattab et al. is more realistic and covers both propagation loss and interface loss. According to the authors, it is the first radio propagation model developed for UWSNs.

Anticollision protection of distant radio-frequency identification tags based on surface acoustic waves

2016 ◽  
Vol 61 (8) ◽  
pp. 932-936 ◽  
Author(s):  
S. G. Suchkov ◽  
S. A. Nikitov ◽  
S. S. Yankin ◽  
V. A. Nikolaevtsev ◽  
S. V. Komkov ◽  
...  
Keyword(s):  
Radio Frequency ◽  
Radio Frequency Identification ◽  
Acoustic Waves ◽  
Surface Acoustic Waves ◽  
Frequency Identification ◽  
Identification Tags

Ion-acoustic waves in large radio-frequency electric fields

1976 ◽  
Vol 19 (4) ◽  
pp. 557 ◽  
Author(s):  
A. Lee ◽  
W. D. Jones ◽  
S. M. Gleman ◽  
H. J. Doucet
Keyword(s):  
Radio Frequency ◽  
Electric Fields ◽  
Acoustic Waves ◽  
Ion Acoustic Waves ◽  
Ion Acoustic ◽  
Radio Frequency Electric Fields

Characterization of RF Sputtered ZnO Piezoelectric Films Using Transmission Electron Microscope

1975 ◽  
Vol 33 ◽  
pp. 86-87
Author(s):  
Kemining W. Yeh ◽  
Richard S. Muller ◽  
Wei-Kuo Wu ◽  
Jack Washburn
Keyword(s):  
Integrated Circuit ◽  
Acoustic Waves ◽  
New Technology ◽  
Surface Acoustic Waves ◽  
Electromechanical Properties ◽  
Leading Role ◽  
Saw Devices ◽  
Transmission Electron ◽  
High Degree

Considerable and continuing interest has been shown in the thin film transducer fabrication for surface acoustic waves (SAW) in the past few years. Due to the high degree of miniaturization, compatibility with silicon integrated circuit technology, simplicity and ease of design, this new technology has played an important role in the design of new devices for communications and signal processing. Among the commonly used piezoelectric thin films, ZnO generally yields superior electromechanical properties and is expected to play a leading role in the development of SAW devices.

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