scholarly journals Optical narrow band filter without resonance's

2004 ◽  
Vol 17 (2) ◽  
pp. 209-217 ◽  
Author(s):  
Crassen Hruschka ◽  
Udo Barabas ◽  
Lutz Gohler
Keyword(s):  
Filter Design ◽  
Finite Impulse Response ◽  
Stop Band ◽  
Pass Band ◽  
Material System ◽  
Optical Wave ◽  
Transversal Filters ◽  
Narrow Band Filter ◽  
Wave Filter ◽  
Impulse Response Filter

This paper introduces an optical wave filter, which uses gratings at 45? or 135? inclined grating lines that avoid any resonance's. Therefore, many more options to form the filter shape exist. In general, the filter design can be traced to that of transversal filters (finite impulse response filter, FIR filter). Such an integrated optical wave filter is characterized by steep filter slopes and a narrow pass band (less then 01nm) combined with a high stop band attenuation (more than 40dB) and a linear phase response in the pass band. Compared to conventional Bragg grating filters, the inclined grating line filters can have a flatter pass band and steeper filter skirts related to the width of the pass band. In general, the filter's realization is possible using any optical material. In view of the excellent optical properties the semiconductor material system InP/InGaAsP is used for manufacturing the filter.

Digital Stable IIR Band Pass Filter Design Using Seeker Optimization Technique

2014 ◽  
Vol 905 ◽  
pp. 406-410 ◽  
Author(s):  
S.K. Saha ◽  
Rajib Kar ◽  
D. Mandal ◽  
S.P. Ghoshal
Keyword(s):  
Filter Design ◽  
Fitness Function ◽  
Stop Band ◽  
Infinite Impulse Response ◽  
Pass Band ◽  
Band Pass Filter ◽  
Pass Filter ◽  
Iir Filter ◽  
Real Coded Genetic Algorithm ◽  
Band Pass

This paper presents a novel, control parameter independent evolutionary search technique known as Seeker Optimization Algorithm (SOA) for the design of a eighth order Infinite Impulse Response (IIR) Band Pass (BP) filter. A new fitness function has also been adopted in this paper to improve the stop band attenuation to a great extent. The performance of the SOA based IIR BP filter design has proven to be much superior as compared to those obtained by real coded genetic algorithm (RGA) and standard particle swarm optimization (PSO) in terms of highest sharpness at cut-off, smallest pass band ripple, highest stop band attenuation, smallest stop band ripple and also the fastest convergence speed with assured stability recognized by the pole-zero analysis of the designed optimized IIR filter.

Multifunctional One-dimensional Phononic Crystal Structures Exploiting Interfacial Acoustic Waves

2009 ◽  
Vol 1188 ◽  
Author(s):  
Albert C To ◽  
Bong Jae Lee
Keyword(s):  
Acoustic Waves ◽  
Filter Design ◽  
Phononic Crystal ◽  
Stop Band ◽  
Phononic Crystals ◽  
Thermal Barrier ◽  
Interfacial Wave ◽  
Lateral Direction ◽  
One Dimensional ◽  
Wave Filter

AbstractThe present study demonstrates that interfacial acoustic waves can be excited at the interface between two phononic crystals. The interfacial wave existing between two phononic crystals is the counterpart of the surface electromagnetic wave existing between two photonic crystals. While past works on phononic crystals exploit the unique bandgap phenomenon in periodic structures, the present work employs the Bloch wave in the stop band to excite interfacial waves that propagate along the interface and decay away from the interface. As a result, the proposed structure can be used as a wave filter as well as a thermal barrier. In wave filter design, for instance, the incident mechanical wave energy can be guided by the interfacial wave to the lateral direction; thus, its propagation into the depth is inhibited. Similarly, in thermal barrier design, incident phonons can be coupled with the interfacial acoustic wave, and the heat will be localized and eventually dissipated at the interface between two phononic crystals. Consequently, the thermal conductivity in the direction normal to the layers can be greatly reduced. The advantage of using two phononic crystals is that the interfacial wave can be excited even at normal incidence, which is critical in many engineering applications. Since the proposed concept is based on a one-dimensional periodic structure, the analysis, design, and fabrication are relatively simple compared to other higher dimensional material designs.

Design of Optimal Two-Dimensional FIR Filters with Quadrantally Symmetric Properties Using Vortex Search Algorithm

2019 ◽  
Vol 29 (10) ◽  
pp. 2050155 ◽  
Author(s):  
Suman Yadav ◽  
Richa Yadav ◽  
Ashwni Kumar ◽  
Manjeet Kumar
Keyword(s):  
Particle Swarm Optimization ◽  
Finite Impulse Response ◽  
Search Algorithm ◽  
Stop Band ◽  
Particle Swarm ◽  
Pass Band ◽  
Swarm Optimization ◽  
Genetic Search ◽  
Hybrid Particle Swarm Optimization ◽  
Real Coded Genetic Algorithm

This research paper presents a new evolutionary technique named vortex search optimization (VSO) to design digital 2D finite impulse response (FIR) filter for improved performance both in pass-band and stop-band regions. Optimum filter coefficients are calculated by minimizing the deviation of actual frequency response from specified or desired response. Efficiency of the designed filter is measured by several parameters, such as maximum pass-band ripple, maximum stop-band ripple, mean attenuation in stop band and time taken, to execute the code. Analysis of the performance of designed filter is correlated with various different algorithms like real coded genetic algorithm, particle swarm optimization, genetic search algorithm and hybrid particle swarm optimization gravitational algorithm. Comparative study shows significant reduction in pass-band error, stop-band error and execution time.

scholarly journals FPGA Based Performance Analysis of Multistage CIC Decimation Filter Design with former CIC Filter for WiMAX Applications

2019 ◽  
Vol 8 (6) ◽  
pp. 5084-5089
Keyword(s):  
Frequency Response ◽  
Filter Design ◽  
Stop Band ◽  
Pass Band ◽  
Two Stage ◽  
Simulink Model ◽  
Cic Filter ◽  
Decimation Filter ◽  
Two Stages ◽  
Kaiser Window

The motto of this paper is to design and realize decimation filter using CIC filter. The main drawback of this filter is there is large droop in pass band and very less attenuation in stop band. So, to improve the frequency response of CIC filter we go for two stage realization of CIC filter. At the initial stage we use CIC filter and in the last stage we use Kaiser Window and improve the characteristics of filter design. When we design a filter using multistage methodology the order of the filter as well as power also decreases. Tools used are MATLAB Simulink Model and Xilinx system generator and realization is done on Virtex V-XC5VLX110T-3ff136. In this paper the proposed two stage realization is compared with respect to two stages Kaiser window realization in the terms of number of LUT’s required, slices as well as power dissipation and improvements in frequency response with respect to conventional CIC filter are compared

scholarly journals Design and Implementation of a Novel Microstrip Filter

2019 ◽  
Vol 8 (2S5) ◽  
pp. 43-46
Keyword(s):  
Transmission Line ◽  
Impulse Response ◽  
Printed Circuit Board ◽  
Filter Design ◽  
Finite Impulse Response ◽  
Circuit Board ◽  
Infinite Impulse Response ◽  
Pass Band ◽  
Electrical Transmission ◽  
Band Frequency

Microwave filters are circuits which perform signal processing functions, particularly to eliminate unwanted frequency components from the signal, to enhance wanted ones, or both. Electronic filters can be passive or active(depends on components used) Analog or digital(depends on input signal) High-pass, Low-pass, Band-pass, Band-stop or all other pass (depends on frequency) Infinite impulse response (IIR type) or Finite impulse response (FIR type) (Depends on response) Microstrip is a type of electrical transmission line which can be fabricated using printed circuit board technology, and is used to convey microwave frequency signals. Microwave components such as antennas, couplers, filters, power dividers etc can be formed using microstrip line. This paper aims on filter design, using microstrip transmission line, with a Non-Periodic technique especially using Defected Microstrip Structure to be operated in the C – Band frequency.

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