scholarly journals Noncoherent Low-Frequency Ultrasonic Communication System with Optimum Symbol Length

2016 ◽  
Vol 12 (5) ◽  
pp. 9713180 ◽  
Author(s):  
Kwang Myung Jeon ◽  
Hong Kook Kim ◽  
Myung J. Lee
Keyword(s):  
Communication System ◽  
Low Frequency ◽  
Ultrasonic Communication

Modeling of a two‐transducer through‐wall ultrasonic communication system.

2010 ◽  
Vol 127 (3) ◽  
pp. 1953-1953
Author(s):  
Sebastian Roa Prada ◽  
Kyle R. Wilt ◽  
Henry A. Scarton ◽  
Gary J. Saulnier ◽  
Jonathan D. Ashdown ◽  
...  
Keyword(s):  
Communication System ◽  
Ultrasonic Communication

scholarly journals A Design of Dual Broadband Antenna in Mobile Communication System

2015 ◽  
Vol 2015 ◽  
pp. 1-9 ◽  
Author(s):  
Jianming Zhou
Keyword(s):  
Mobile Communication ◽  
Communication System ◽  
High Frequency ◽  
Microstrip Line ◽  
Low Frequency ◽  
Dielectric Substrate ◽  
Frequency Bandwidth ◽  
Broadband Antenna ◽  
Feeding Method ◽  
Frequency Unit

A design of dual broadband antenna is proposed in this paper; it consists of one low frequency unit and two high frequency units. The low frequency unit consists of a pair of printing vibrators; the high frequency unit consists of a pair of printing oscillators, which is bent at its end, and high frequency unit and low frequency unit are set on the same dielectric substrate. Through adding a parasitic unit on antenna, it can enhance frequency bandwidth without affecting the bandwidth. In the high frequency unit, it adopts gap-coupled microstrip line feeding method in order to get enough bandwidth. Through the test of dual broadband antenna, it can be found that, in the low frequency part, the antenna covers 20% bandwidth of the total bandwidth, and it covers the frequency from 800 MHz to 980 MHz. In the high frequency, the antenna covers 60% of total bandwidth and its frequency is from 1540 MHz to 2860 MHz, so the designed antenna can satisfy the frequency requirements of 2G/3G/LTE (4G) communication system.

Finite Element Modeling and Simulation of a Two-Transducer Through-Wall Ultrasonic Communication System

2009 ◽  
Author(s):  
K. R. Wilt ◽  
H. A. Scarton ◽  
S. Roa-Prada ◽  
G. J. Saulnier ◽  
J. D. Ashdown ◽  
...  
Keyword(s):  
Finite Element ◽  
Finite Element Modeling ◽  
Communication System ◽  
Continuous Wave ◽  
Transmitted Beam ◽  
Element Modeling ◽  
Reflected Wave ◽  
Physical Measurements ◽  
Metal Vessel ◽  
Ultrasonic Communication

A finite element simulation of a through-wall ultrasonic communication system which permits data to be transferred from the inside of a sealed metal vessel to the outside without the need for physical penetrations is introduced. Two transducers are aligned axially on either side of a thick solid stainless steel wall. The outside transducer is forced with a continuous sinusoidal voltage at the crystal’s nominal 1 MHz longitudinal resonant frequency, launching a wave into the wall. The transmitted beam is partially reflected off of the inside of the wall where the inside transducer is located. The amplitude of the reflected wave is modulated by switching the electrical impedance placed across the leads of the inside transducer. The reflected wave is received at the outside transducer and the continuous wave amplitude is sensed to detect the transmitted data bits. The system is modeled and simulated using a commercial finite element modeling package. A coupled stress-strain and piezoelectric analysis is performed using an axisymmetric geometry. The model represents an existing system from which physical measurements were taken. Excellent correlation between the model and system were observed and the model has been used to further optimize the communication system.

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