Solution of Some Problems oOf Single-Scale Wavelet Transform Processor Using a Magnetostatic Surface Wave Device

Abstract

In this paper, we investigate the implementation schemes of a single-scale wavelet transform processor using magnetostatic surface wave (MSSW) devices. There are three implementation schemes: the interdigital transducer, the meander line transducer and the grating transducer. Because the interdigital transducer has excellent properties, namely, good frequency characteristic and low insertion loss, we use the interdigital transducer as the implementation scheme of a single-scale wavelet transform processor using MSSW device. In the paper, we also present the solutions to the three key problems: the direct coupling between the input transducer and the output transducer, the insertion loss, and the loss characteristics of the gyromagnetic film having an influence on the wavelet transform processor. There are two methods of reducing the direct coupling between the input transducer and the output transducer: increasing the distance between the input transducer and the output transducer, and placing a metal “wall” between the input transducer and the output transducer. There also are two methods of reducing the insertion loss of a single-scale wavelet transform processor using a MSSW device for scale: the appropriate thickness of the yttrium iron garnet (YIG) film and the uniform magnetic field.The smaller the ferromagnetic resonance linewidth of the gyromagnetic film , the smaller the magnetostatic wave propagation loss.

Study of SAW Based on a Micro Force Sensor in Wireless Sensor Network

“…In other words, using the SAW drift output frequency can measure the micropressure weight loaded on the sensor cantilever. (13), the function relationship between the micro-pressure loaded on the sensor ( ) and the difference frequency (Δ ) of the output frequency can be written as follows:…”

“…Surface acoustic wave (SAW) is an interdisciplinary subject that includes acoustics, electronics, piezoelectric materials, and semiconductor technology applied in the rapid development of large-scale integrated circuits of microelectronics, computer, silicon micromechanical processing, 2 Journal of Electrical and Computer Engineering semiconductor planar process, and laser technologies. SAW sensors have excellent properties, such as passivity, small size, low cost, excellent temperature stability, high reliability, and high reproducibility, which overcome the complicated algorithms and high power of VLSI [11,12] and the large size and low reproducibility of optical devices [13]. The development of SAW based on a micro force sensor has been oriented toward intelligent wireless networks [14,15].…”

“…, 147]; = [0,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20]; = zeros(5, 7); % Define the matrix size for = 2 : 6; % 3 to 7 times fitting [ , ] = polyfit( , , ); % Polynomial fitting ( − 1, 1 : + 1) = ; % Assign to matrix = polyval( , , ); % Calculate the fitting values of ( −1) = std( − ); % Calculate the standard deviation between the fitting value and original data end Results are as follows:…”