Design and implementation of reflectionless filters

Download
2016
Çubukcu, Ali İhsan
In this thesis, typical applications of absorptive filters are examined. To better understand the effect of out of band matching of RF and microwave filters on overall system, some experiment setupsare constructed and simulations are performed. In addition to this, three types of conventional absorptive filter topologies are analyzed and the realizability of each type is shown by explanation, simulation or measurement. Finally, a recently found method, reflectionless filter structures by Matthew Morgan, is analyzed and various types of reflectionless filters are designed and implemented. Furthermore, some approaches are stated to obtain better filter characteristics with the same topology.

Suggestions

Design of Microstrip Quadruplet Filters on Filpro
Oruc, Sacid; Yıldırım, Nevzat (2018-11-02)
In this paper, a simple dimensional design procedure is developed for microstrip/stripline quadruplet filters by starting with direct BP synthesis of a lumped quadruplet with inverter couplings, K14, K12, K23 and K34. K14 is the cross-coupling inverter which creates a symmetric pair of finite transmission zeros (FTZ's) if the sign of K14 is opposite of the other inverters while a complex TZ is created if K14 has the same sign as the other inverters leading to linear phase (flat delay) responses. The LC reso...
Design of a Novel THz Sensor for Structural Health Monitoring Applications
Pavia, J. P.; Ribeiro, M. A.; Sarikaya, C. K.; Akbar, D.; Altan, Hakan; Souto, N. (2019-01-01)
In this paper, we propose a study on the characterization, design and simulation of a THz sensor for applications in Structural Health Monitoring (SHM). The proposed sensor is assembled using two frequency selective surfaces (FSSs) based on metamaterial wire resonators. We present a theoretical model to describe its electromagnetics which is used not only to understand the physical principles underlying the functioning of the sensor but also to determine a set of optimized parameters for its operation in th...
Experimental investigation of particle filtration in compression resin transfer molding of advanced composites
Aydil Dalkıran, Tuğçe; Erdal Erdoğmuş, Merve; Department of Mechanical Engineering (2014)
With the inclusion of particle fillers in advanced continuous fiber reinforced composites, issues such as impregnation with increased viscosity of the injected resin leading to high process pressures and possible nonhomogeneous/directional composite properties due to filtering of filler particles necessitate the study of the relations between processing parameters and the resulting particle distributions. In this study, the particle-resin interaction during compression resin transfer molding (CRTM) and resi...
Implementation and characterization of an absorption filter for on-chip fluorescent imaging
Yıldırım, Ender; Arpali, Serap Altay (2017-04-01)
Here we present fabrication and characterization of an absorption filter with superior roll-on properties and precisely tunable cut-off wavelengths for fluorescent imaging applications in lab-on-a-chip systems. The filters were fabricated by spinning dye doped photopolymer (Orasol Yellow in Norland Optical Adhesive 60) on glass substrates. The fabrication technique allowed us to precisely tune the cut-off wavelength of the filters. We showed that filters with different cut-off in the range of 386 nm-504 nm ...
Optimization of Hot Embossing Process for Fabrication of Microfluidic Devices
Ziyara, Abbas; Çoğun, Ferah; Varol, Ceren; Totuk, Onat Halis; Yıldırım, Ender (2015-05-14)
This paper presents a low cost hot embossing press and optimization of the process parameters for fabrication of microfluidic chips. For testing purposes, we fabricated a mold made of brass using micro milling process. By utilizing Taguchi method we found that 200 µm wide channels on polymethylmethacrylate (PMMA) substrates can be obtained by applying 240 bars for 6 min. under 180oC. Total cycle time per one chip is measured as 11 min.
Citation Formats
A. İ. Çubukcu, “Design and implementation of reflectionless filters,” M.S. - Master of Science, Middle East Technical University, 2016.