SINGLE-PHASE UNIDIRECTIONAL TRANSDUCERS ANALYSIS AND THEIR APPLICATION TO SURFACE ACOUSTIC WAVE FILTERS DESIGN

2019 ◽  
pp. 58-70
Author(s):  
I. G. Antсev ◽  
S. V. Bogoslovsky ◽  
G. A. Sapognikov ◽  
A. R. Zhezherin
Keyword(s):  
Acoustic Wave ◽  
Single Phase ◽  
Monitoring Systems ◽  
Technological Parameters ◽  
Wireless Monitoring ◽  
Saw Devices ◽  
Different Types ◽  
Radio Systems ◽  
Interdigital Transducer ◽  
Wave Filters

The unidirectional interdigital transducer topology features when designing SAW filters are considered. As well there are considered physical properties of various piezo‑crystals with different types of cut that allow to realize unidirectional operation of interdigital transducer. There are analyzed the conditions when the »natural» directivity of interdigital transducer becomes possible, topological variety of such transducers are considered. Various types of topology for transducers with a constant aperture are presented. Influence of the form, topology and dimensions of electrodes on characteristics of devices with directional interdigital transducers is analyzed. Influence of substrates technological parameters and interdigital transducers elements (electrodes material and thickness, substrate crystals types and cuts) on the value of attenuation and level of false signals is considered. Articles of functional electronics and SAW piezoelectric filters are used in various radio systems. Creation of passive wireless monitoring systems with use of SAW devices is considered as a separate direction of research.

10 GHz Surface Acoustic Wave Filters with Narrow-Gap Interdigital Transducer Structure

1996 ◽  
Vol 35 (Part 1, No. 5B) ◽  
pp. 2994-2996
Author(s):  
Kazuhiko Yamanouchi ◽  
Kazuo Aoki ◽  
Takatoshi Tsuji ◽  
Yasuo Wagatsuma
Keyword(s):  
Acoustic Wave ◽  
Surface Acoustic Wave ◽  
Narrow Gap ◽  
Interdigital Transducer ◽  
Wave Filters ◽  
Surface Acoustic Wave Filters

The Impact of Mental States on Semi-autonomous Driving Takeover Performance: A Systematic Review

2020 ◽  
Vol 64 (1) ◽  
pp. 1372-1376
Author(s):  
Gaojian Huang ◽  
Christine Petersen ◽  
Brandon J. Pitts
Keyword(s):  
Systematic Review ◽  
Autonomous Vehicles ◽  
Response Times ◽  
Autonomous Driving ◽  
Mental States ◽  
Manual Control ◽  
Monitoring Systems ◽  
Wide Range ◽  
Different Types ◽  
The Impact

Semi-autonomous vehicles still require drivers to occasionally resume manual control. However, drivers of these vehicles may have different mental states. For example, drivers may be engaged in non-driving related tasks or may exhibit mind wandering behavior. Also, monitoring monotonous driving environments can result in passive fatigue. Given the potential for different types of mental states to negatively affect takeover performance, it will be critical to highlight how mental states affect semi-autonomous takeover. A systematic review was conducted to synthesize the literature on mental states (such as distraction, fatigue, emotion) and takeover performance. This review focuses specifically on five fatigue studies. Overall, studies were too few to observe consistent findings, but some suggest that response times to takeover alerts and post-takeover performance may be affected by fatigue. Ultimately, this review may help researchers improve and develop real-time mental states monitoring systems for a wide range of application domains.

scholarly journals On the Performance Evaluation of Commercial SAW Resonators by Means of a Direct and Reliable Equivalent-Circuit Extraction

Micromachines ◽  
2021 ◽  
Vol 12 (3) ◽  
pp. 303
Author(s):  
Giovanni Gugliandolo ◽  
Zlatica Marinković ◽  
Giuseppe Campobello ◽  
Giovanni Crupi ◽  
Nicola Donato
Keyword(s):  
Performance Evaluation ◽  
Acoustic Wave ◽  
Equivalent Circuit ◽  
Surface Acoustic Wave ◽  
Equivalent Circuit Model ◽  
Practical Applications ◽  
Saw Devices ◽  
S Parameter ◽  
Commercial Device ◽  
Saw Resonators

Nowadays, surface acoustic wave (SAW) resonators are attracting growing attention, owing to their widespread applications in various engineering fields, such as electronic, telecommunication, automotive, chemical, and biomedical engineering. A thorough assessment of SAW performance is a key task for bridging the gap between commercial SAW devices and practical applications. To contribute to the accomplishment of this crucial task, the present paper reports the findings of a new comparative study that is based on the performance evaluation of different commercial SAW resonators by using scattering (S-) parameter measurements coupled with a Lorentzian fitting and an accurate modelling technique for the straightforward extraction of a lumped-element equivalent-circuit representation. The developed investigation thus provides ease and reliability when choosing the appropriate commercial device, depending on the requirements and constraints of the given sensing application. This paper deals with the performance evaluation of commercial surface acoustic wave (SAW) resonators by means of scattering (S-) parameter measurements and an equivalent-circuit model extracted using a reliable modeling procedure. The studied devices are four TO-39 packaged two-port resonators with different nominal operating frequencies: 418.05, 423.22, 433.92, and 915 MHz. The S-parameter characterization was performed locally around the resonant frequencies of the tested SAW resonators by using an 8753ES Agilent vector network analyzer (VNA) and a home-made calibration kit. The reported measurement-based study has allowed for the development of a comprehensive and detailed comparative analysis of the performance of the investigated SAW devices. The characterization and modelling procedures are fully automated with a user-friendly graphical user interface (GUI) developed in the Python environment, thereby making the experimental analysis faster and more efficient.

Low loss surface acoustic wave SAW devices based on Al1-xMxN (M=Cr, Y, Sc) thin films

2021 ◽  
pp. 412990
Author(s):  
Saad Amara ◽  
Fares Kanouni ◽  
Farouk Laidoudi ◽  
Khaled Bouamama
Keyword(s):  
Thin Films ◽  
Acoustic Wave ◽  
Surface Acoustic Wave ◽  
Low Loss ◽  
Saw Devices

Design and Implementation of Wireless Voltage Monitoring System Based on Zigbee

2017 ◽  
Vol 12 (3) ◽  
pp. 83-96 ◽  
Author(s):  
Luo Xiaohui
Keyword(s):  
Monitoring System ◽  
Single Phase ◽  
Low Cost ◽  
Moving Average ◽  
Voltage Sensor ◽  
Wireless Transmission ◽  
Phase Voltage ◽  
Medium Voltage ◽  
Wireless Monitoring ◽  
Three Phase

This paper proposed a low cost wireless monitoring system based on ZigBee wireless transmission, and designed a new floating voltage sensor which is suitable for the monitoring of medium voltage and high voltage(MV/HV) public equipment. The system used TI-CC2530 as the controller, proposed a new moving average voltage sensing(MAVS) algorithm by reasonable assumptions, and adopted algorithms to perform the theoretical analysis for the single phase and three-phase voltage. At last, the author carried out a practical experiment on the wireless floating voltage sensor under the voltage up to 30kV, the experimental results showed that the proposed low cost wireless sensor can achieve a good voltage monitoring function, and the error is less than 3%.

Acoustic wave filters

1923 ◽  
Vol 195 (5) ◽  
pp. 718
Author(s):  
G.F.S.
Keyword(s):  
Acoustic Wave ◽  
Wave Filters
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