Artificial Plasmonic Metamaterial Fabricated by Micro-Stereolithography

2003 ◽  
Author(s):  
Dongmin Wu ◽  
Nicholas Fang ◽  
Cheng Sun ◽  
Xiang Zhang ◽  
Willie J. Padilla ◽  
...  
Keyword(s):  
Plasma Frequency ◽  
Thin Metal ◽  
Imaging Systems ◽  
Approximate Theory ◽  
Pass Filter ◽  
Structured Materials ◽  
The Wire ◽  
Thin Metal Wire ◽  
Metal Wires ◽  
High Pass

Micro-structured materials, which contain engineered subwavelength components, can be designed to have positive or negative ε and μ at desired frequency. In this paper, we demonstrate a high pass Terahertz (THz) filter which utilizes the lowered plasma frequency of thin metal wire structures. This high pass filter may have applications in the THz imaging systems. The filter is formed by two-dimensional cubic lattice of thin metal wires. The diameter of the wire is 30 μm, the lattice constant is 120 μm, and the length of the wire is 1mm. Micro-stereolithography technique is applied to fabricate this high aspect ratio cylinders. The reflection property of the filter is characterized by Fourier transform infrared (FTIR) spectroscopy, and a plasma frequency at 0.7 THz is observed, which agrees with the approximate theory.

Nonmetallic behaviour in thin metal wires

1983 ◽  
Vol 61 (7) ◽  
pp. 979-980
Author(s):  
Neeraj Jain ◽  
Ramji Srivastava
Keyword(s):  
Thermal Expansion ◽  
Temperature Coefficient ◽  
Low Temperatures ◽  
Wire Diameter ◽  
Thin Metal ◽  
Temperature Coefficient Of Resistivity ◽  
The Wire ◽  
Metal Wires

General expressions for the temperature coefficient of resistivity (TCR) of thin metal wires have been derived by incorporating the thermal expansion of the wire diameter and the wire-to-substrate expansion mismatch. A possibility of transition to nonmetallic behaviour is predicted at low temperatures.

A V-Band Two Pole High-Pass Filter for Frequency Quadrupler Design

2016 ◽  
Vol 6 (1) ◽  
pp. 56
Author(s):  
Maryam Abata ◽  
Mahmoud Mehdi ◽  
Said Mazer ◽  
Moulhime El Bekkali ◽  
Catherine Algani
Keyword(s):  
Pass Filter ◽  
High Pass Filter ◽  
V Band ◽  
High Pass

Baseline-free sensor fault detection for piezoelectric array

2021 ◽  
pp. 1045389X2110188
Author(s):  
Qibo Mao ◽  
Yuande Wang ◽  
Shizuo Huang
Keyword(s):  
Prior Knowledge ◽  
Frequency Response Function ◽  
Sensor Array ◽  
Piezoelectric Element ◽  
Piezoelectric Sensor ◽  
Steel Beam ◽  
Sensor Fault ◽  
Pass Filter ◽  
Sensor Fault Detection ◽  
High Pass

In this study, a new methodology is presented to detect the sensor fault for piezoelectric array based on the filtered frequency response function (FRF) shapes. The proposed method does not require prior knowledge about healthy piezoelectric array. First, the imaginary parts of FRFs from the piezoelectric array during vibration are measured and normalized to obtain the FRF shapes in different frequencies. Then the irregularities in these FRF shapes are extracted by using high-pass filter with properly chosen cut-off frequency. These abnormal irregularities on the filtered FRF shape curves indicate the location of the faulty sensor, due to the irregularity of FRF shapes introduced by the faulty piezoelectric element. The proposed sensor fault method is experimentally demonstrated on a clamped-clamped steel beam mounted with piezoelectric buzzer array. Two common piezoelectric sensor fault types including sensor breakage and debonding are evaluated. The experimental results indicate that the proposed method has great potential in the detection of the sensor fault for piezoelectric array as it is simple and does not require the FRF data of the healthy sensor array as a baseline.

scholarly journals High-Bandpass Filters in Electrocardiography: Source of Error in the Interpretation of the ST Segment

2012 ◽  
Vol 2012 ◽  
pp. 1-10 ◽  
Author(s):  
F. Buendía-Fuentes ◽  
M. A. Arnau-Vives ◽  
A. Arnau-Vives ◽  
Y. Jiménez-Jiménez ◽  
J. Rueda-Soriano ◽  
...  
Keyword(s):  
Real Time ◽  
Fourier Transforms ◽  
Pass Filter ◽  
Discrete Fourier Transforms ◽  
Real Time Mode ◽  
Asymptomatic Patients ◽  
St Segment ◽  
Coronary Syndromes ◽  
Clinically Significant ◽  
High Pass

Introduction. Artifactual variations in the ST segment may lead to confusion with acute coronary syndromes. Objective. To evaluate how the technical characteristics of the recording mode may distort the ST segment. Material and Method. We made a series of electrocardiograms using different filter configurations in 45 asymptomatic patients. A spectral analysis of the electrocardiograms was made by discrete Fourier transforms, and an accurate recomposition of the ECG signal was obtained from the addition of successive harmonics. Digital high-pass filters of 0.05 and 0.5 Hz were used, and the resulting shapes were compared with the originals. Results. In 42 patients (93%) clinically significant alterations in ST segment level were detected. These changes were only seen in “real time mode” with high-pass filter of 0.5 Hz. Conclusions. Interpretation of the ST segment in “real time mode” should only be carried out using high-pass filters of 0.05 Hz.

A New Stripline High Pass Filter Layout

2000 ◽  
Vol 14 (3) ◽  
pp. 423-439 ◽  
Author(s):  
F. Bilotti ◽  
L. Vegni ◽  
A. Toscano
Keyword(s):  
Pass Filter ◽  
High Pass Filter ◽  
High Pass

Ripple FPN reduced algorithm based on temporal high-pass filter and hardware implementation

2016 ◽  
Author(s):  
Yiyang Li ◽  
Shuo Li ◽  
Zhipeng Zhang ◽  
Weiqi Jin ◽  
Lei Wu ◽  
...  
Keyword(s):  
Hardware Implementation ◽  
Pass Filter ◽  
High Pass Filter ◽  
High Pass
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