Research on Digital Filter Design for Orthogonal Decomposition Algorithm Applied in Coriolis Flow Meters

2013 ◽  
Vol 475-476 ◽  
pp. 161-166
Author(s):  
Wu Liu ◽  
Guo Qing Ding ◽  
Xin Chen
Keyword(s):  
Digital Filter ◽  
Filter Design ◽  
Notch Filter ◽  
Orthogonal Decomposition ◽  
Pass Filter ◽  
Low Pass Filter ◽  
Flow Meters ◽  
Digital Filter Design ◽  
Low Pass ◽  
Coriolis Flow Meters

Coriolis flow meters are used in measuring flow amount of natural gas and oil due to the good performance and high precision. Orthogonal decomposition algorithm is the most efficient algorithm with the highest precision in processing the digital signals of Coriolis flow meters, and digital filter design is vital important in the algorithm. In this paper we introduce a digital filter system combining the self-adaptive lattice notch filter and low pass filter embedded with Hanning Window or Kaiser Window, we also discussed the parameters selection and adjusting method deeply and systematically. For self-adaptive lattice notch filter, we calculate the key feedback parameter ρ based on bandwidth BW, leading the relative error of frequency calculated within 0.01%. For low pass digital filter, we adjust the filter order through monitoring the sine feature of the orthogonal component that has passed the low pass filter, and the relative errors of phase difference are within 0.1%. We also demonstrate the feasibility of this system through simulation under MATALAB system and calculating experiments data of Coriolis flow meter.

A View of Recursive Digital Filter Design Methods

1976 ◽  
Vol 13 (4) ◽  
pp. 371-379
Author(s):  
S. M. Bozic
Keyword(s):  
Digital Filter ◽  
Filter Design ◽  
Simple Design ◽  
Simple Manner ◽  
Pass Filter ◽  
Low Pass Filter ◽  
Digital Filter Design ◽  
Recursive Digital Filter ◽  
Low Pass ◽  
Z Transformation

The object of this paper is to examine and explain in a simple manner some of the inherent properties of the bilinear z-transformation as used in the recursive low-pass filter design. It also compares it with the standard z-transformation and illustrates some finer points on a simple design example.

Digital Filter Design in Power’s Harmonic Wave Detection

2011 ◽  
Vol 84-85 ◽  
pp. 457-460
Author(s):  
Yu Liang Liu ◽  
Yu Lian Zhang ◽  
S. Chen
Keyword(s):  
Reactive Power ◽  
Filter Design ◽  
Harmonic Wave ◽  
Harmonic Signal ◽  
Pass Filter ◽  
Low Pass Filter ◽  
Digital Filter Design ◽  
Instantaneous Reactive Power Theory ◽  
Main Motive ◽  
Low Pass

Pollution harness of industry power mainly depends on high-accuracy harmonic signal detection. In this paper digital filtering technology and instantaneous reactive power theory are used to detect power harmonic signal and the main motive is to reduce the computation amount. A low-pass filter with Butterworth style is designed and its effectiveness to detect the second-order harmonic wave is shown by numerical simulation.

scholarly journals Compact D-CRLH resonator for low-pass filter with wide rejection band, high roll-off, and transmission zeros

2018 ◽  
Vol 11 (5-6) ◽  
pp. 509-516 ◽  
Author(s):  
Dilip Kumar Choudhary ◽  
Mahmoud A. Abdalla ◽  
Raghvendra Kumar Chaudhary
Keyword(s):  
Filter Design ◽  
Short Circuit ◽  
Tank Circuit ◽  
Pass Filter ◽  
Low Pass Filter ◽  
Filter Bandwidth ◽  
Transmission Zeros ◽  
Low Pass ◽  
Lc Tank ◽  
Rejection Band

AbstractA compact low-pass filter (LPF) with wide rejection band based on T-type circuit of an enhanced dual composite right-/left-handed (D-CRLH) resonator is presented in this paper. The resonator has only one cell with series and parallel tank circuit. The parallel LC tank circuit has been realized by an interdigital capacitor and one shorted finger, whereas its series LC tank circuit is realized by an air gap capacitance and a short circuit stub. The filter has wide rejection band bandwidth with three transmission zeros (TZs). The filter bandwidth and TZs frequencies are controlled by the D-CRLH element values. The results of the proposed filter demonstrate minimum insertion loss in passband, high roll-off rate, and good figure of merit. The measured results are in good agreement with the simulated results. The detailed filter design is discussed in terms of circuit modeling, dispersion analysis, and full-wave simulation. Finally, the filter size is compact (0.10 λg × 0.15 λg) at cut-off frequency.

A semi-lumped microstrip UWB bandpass filter

2009 ◽  
Vol 1 (1) ◽  
pp. 57-64 ◽  
Author(s):  
Darine Kaddour ◽  
Jean-Daniel Arnould ◽  
Philippe Ferrari
Keyword(s):  
Group Delay ◽  
Bandpass Filter ◽  
Filter Design ◽  
Sensitivity Study ◽  
Critical Parameters ◽  
Center Frequency ◽  
Pass Filter ◽  
Low Pass Filter ◽  
Low Pass ◽  
High Pass

In this paper, a miniaturized bandpass filter for ultra-wide-band applications is proposed. It is based on the embedding of high-pass structures in a low-pass filter. A semi-lumped technology combining surface-mounted capacitors and transmission lines has been used. The filter design rules have been carried out. Furthermore, two filters having a 3-dB fractional bandwidth of 142 and 150%, centered at 0.77 and 1 GHz, respectively, have been realized for a proof of concept. Measured characteristics, in good agreement with simulations, show attractive properties of return loss (|S11| <−18 dB), insertion loss (<0.3 dB), and a maximum group delay and group delay variation of 2 and 1.3 ns, respectively. A distributed filter based on the same low-pass/high-pass approach has been also realized and measured for comparison. The size reduction reaches 85% for the semi-lumped filter, and its selectivity is improved with a shape factor of 1.3:1 instead of 1.5:1. The semi-lumped filter's drawback is related to a smaller rejection bandwidth compared to the distributed one. To improve the high-frequency stopband, an original technique for spurious responses suppression based on capacitively loaded stubs has been proposed. Even if the performances do not reach that obtained for the distributed approach, with this technique spurious responses are pushed until eight times the center frequency. A sensitivity study vs. critical parameters has also been carried out, showing the robustness of the design.

scholarly journals A Microstrip Low-Pass Filter Design Using a Modified Radial Resonator in the Application of Aircraft Distance Measurement Equipment

2021 ◽  
Vol 19 (3) ◽  
pp. 260-267
Author(s):  
Hamid Radmanesh
Keyword(s):  
Communication Systems ◽  
Filter Design ◽  
Model Performance ◽  
Distance Measurement ◽  
Measurement Equipment ◽  
Microstrip Technology ◽  
Pass Filter ◽  
Low Pass Filter ◽  
Low Pass ◽  
Radial Resonator

In this paper, the application of microstrip technology is investigated in low-pass filters. A cascade microstrip low-pass filter with a sharp frequency response and a good cut-off bandwidth is presented using a modified radial resonator. The advantages of this proposed filter include minor losses in the transit band as well as the desired return. This filter design shows consistency when compared with the results of simulation and model performance. A comparison between the parameter values of this filter and previous structures indicates that it is desirable. The proposed filter can be used in modern communication systems such as aircraft distance measurement equipment (DME) antenna.

Active low-pass filter design

1965 ◽  
Vol AU-13 (5) ◽  
pp. 104-111 ◽  
Author(s):  
E. Foster
Keyword(s):  
Filter Design ◽  
Pass Filter ◽  
Low Pass Filter ◽  
Low Pass
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