The design of double ridge waveguide filter using conventional stepped impedance low-pass filter method

2013 ◽  
Vol 56 (1) ◽  
pp. 120-124 ◽  
Author(s):  
Mohsen Yazdani ◽  
Luke Murphy ◽  
Alireza Mallahzadeh ◽  
Ercument Arvas ◽  
Joseph Mautz
Keyword(s):  
Ridge Waveguide ◽  
Filter Method ◽  
Pass Filter ◽  
Low Pass Filter ◽  
Low Pass ◽  
Waveguide Filter ◽  
Double Ridge

scholarly journals Real-Time Filter Method Based on the Structural Frequency of FAST Cabin-Cable System

2014 ◽  
Vol 6 ◽  
pp. 129302
Author(s):  
Wenhua Xu ◽  
Hong Bao ◽  
Jianwei Mi ◽  
Guigeng Yang
Keyword(s):  
Real Time ◽  
Fundamental Frequency ◽  
Variable Structure ◽  
Measured Data ◽  
Filter Method ◽  
Great Flexibility ◽  
Cable System ◽  
Pass Filter ◽  
Low Pass Filter ◽  
Low Pass

Due to great flexibility, low damping, and variable structure in the cabin-cable system of five hundred meter Aperture Spherical Radio Telescope (FAST), a real-time digital low-pass filter based on the analysis of frequency is presented in this paper. Firstly, by the Lomb-Scargle theorem, it can obtain the fundamental frequency of cabin-cable system. Then, using the obtained frequency, a digital low-pass filter is designed to filter the measured data. After being filtered, the measured data are used for coarse control. Finally, the results of the experiments on the FAST 5 m model show that calculating the fundamental frequency is accurate and the filter is effective.

Harmonics suppressed substrate-integrated waveguide filter with integration of low-pass filter

2008 ◽  
Vol 50 (2) ◽  
pp. 447-450 ◽  
Author(s):  
Tae-Soon Yun ◽  
Hee Nam ◽  
Jin-Young Kim ◽  
Byoungje Lee ◽  
Jin-Joo Choi ◽  
...  
Keyword(s):  
Substrate Integrated Waveguide ◽  
Pass Filter ◽  
Low Pass Filter ◽  
Low Pass ◽  
Waveguide Filter

The Research to Image Enhancing Method of Infrared Images

2012 ◽  
Vol 562-564 ◽  
pp. 1642-1645
Author(s):  
Kui Xia Han ◽  
Yan Ling Li ◽  
Mei Yu
Keyword(s):  
Image Enhancement ◽  
Heat Waves ◽  
Thermal Image ◽  
Filter Method ◽  
Infrared Images ◽  
Pass Filter ◽  
Low Pass Filter ◽  
Frequency Selection ◽  
Low Pass ◽  
Image Enhancing

The contrast is low, and the noise is strong in infrared images, which go against defects judgment and recognition. In order to resolve them, limitations of common methods were analyzed, then, according to characters of infrared images and processing target, grayscale value adjustment method and low pass filter method was introduced. Designed image enhancement steps, and it was applied to process thermal image. In process of index low-pass filtering, the cut-off frequency selection was studied. And, it was found, when it was 40, the effect was ideal. Compared the original image with image after treatment, the validity of this method was verified. There an effective way was designed for heat waves image enhancement.

Design of Programmable Wideband Low Pass Filter with Continuous-Time/Discrete-Time Hybrid Architecture

2017 ◽  
Vol E100.C (10) ◽  
pp. 858-865 ◽  
Author(s):  
Yohei MORISHITA ◽  
Koichi MIZUNO ◽  
Junji SATO ◽  
Koji TAKINAMI ◽  
Kazuaki TAKAHASHI
Keyword(s):  
Discrete Time ◽  
Continuous Time ◽  
Hybrid Architecture ◽  
Pass Filter ◽  
Low Pass Filter ◽  
Low Pass
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