Fast Frequency Sweep Technique Based on Segmentation for the Acceleration of the Electromagnetic Analysis of Microwave Devices

The characterization of communication devices in a certain frequency band can be accelerated if a fast frequency sweep technique is used instead of a discrete frequency sweep. Existing fast frequency sweep techniques are either complex or specific for a certain electromagnetic solver. In this work, a new fast frequency sweep method is proposed that consists in segmenting the device under analysis into simple building blocks. Each building block is characterized with a generalized (multimode) circuital matrix whose elements present a simple and flat frequency response that is interpolated using natural cubic splines with very few points. In this way, the response of each block along the whole frequency band is obtained efficiently and accurately with as many frequency points as desired. Then, the circuital matrices of all the blocks are cascaded and the circuital matrix of the whole device in obtained. The new fast frequency sweep was successfully applied to the analysis of different types of devices (all metallic rectangular waveguide filter, dielectric loaded rectangular waveguide filter, and substrate integrated waveguide filter). The computational times were reduced to 15% or 19%, depending on the device, when compared with a discrete frequency sweep using the same electromagnetic solver.

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Additive technology applied to the realization of K-band microwave terminations: reproducibility improvement

International Journal of Microwave and Wireless Technologies ◽

10.1017/s1759078717001404 ◽

2018 ◽

Vol 10 (1) ◽

pp. 3-8

Author(s):

Azar Maalouf ◽

Ronan Gingat ◽

Vincent Laur

Keyword(s):

3D Printing ◽

Frequency Band ◽

Rectangular Waveguide ◽

Three Dimensional ◽

Low Density ◽

Support Material ◽

Additive Technology ◽

3D Printed ◽

K Band

This study examines K-band rectangular waveguide terminations with three-dimensional (3D)-printed loads, and proposes an Asymmetrical Tapered Wedge topology. This geometry shows a good tradeoff between microwave performance and 3D-printing issues (printing directions and support material requirements), thus improving noticeably the reproducibility of the devices. The effect of the density of the 3D-printed load on the reflection parameter of the termination was investigated. Even for a low density, reflection level remained below −27.5 dB between 18 and 26.5 GHz. Reproducibility was demonstrated by the characterization of six loads that were 3D printed under the same conditions. Measurements demonstrate that a maximum reflection parameter level of −33.5 dB can be ensured over the whole frequency band without any post-machining of the 3D-printed devices.

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Synthesis and Spectroscopic and Magnetic Characterization of Tris(3,5-dimethylpyrazol-1-yl)borate Iron Tricyanide Building Blocks, a Cluster, and a One-Dimensional Chain of Squares

Inorganic Chemistry ◽

10.1021/ic051044h ◽

2006 ◽

Vol 45 (5) ◽

pp. 1951-1959 ◽

Cited By ~ 54

Author(s):

Dongfeng Li ◽

Sean Parkin ◽

Guangbin Wang ◽

Gordon T. Yee ◽

Stephen M. Holmes

Keyword(s):

Building Blocks ◽

Dimensional Chain ◽

Magnetic Characterization ◽

One Dimensional

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In-Situ Characterization of Individual Building Blocks for Nanophotonic Solar Cells by Correlative Microscopy

Microscopy and Microanalysis ◽

10.1017/s1431927616012277 ◽

2016 ◽

Vol 22 (S5) ◽

pp. 50-51 ◽

Cited By ~ 1

Author(s):

Sebastian W. Schmitt ◽

George Sarau ◽

Silke H. Christiansen

Keyword(s):

Solar Cells ◽

Building Blocks ◽

Correlative Microscopy ◽

In Situ Characterization

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Conjugated oligomers incorporating azulene building blocks – seven- vs. five-membered ring connectivity

Chemical Science ◽

10.1039/c4sc02210f ◽

2014 ◽

Vol 5 (11) ◽

pp. 4483-4489 ◽

Cited By ~ 45

Author(s):

Elizabeth Amir ◽

Masahito Murai ◽

Roey J. Amir ◽

John S. Cowart ◽

Michael L. Chabinyc ◽

...

Keyword(s):

Building Blocks ◽

Membered Ring ◽

Synthesis And Characterization ◽

Conjugated Oligomers

The properties of isomeric azulene derivatives based on 7- versus 5-membered ring substitution were examined by the synthesis and characterization of well-defined electroactive oligomers.

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Recent Progress in the Synthesis and Characterization of Diarylethene-based MOFs

Acta Crystallographica Section A Foundations and Advances ◽

10.1107/s2053273314087762 ◽

2014 ◽

Vol 70 (a1) ◽

pp. C1223-C1223

Author(s):

Jason Benedict ◽

Ian Walton ◽

Dan Patel ◽

Jordan Cox

Keyword(s):

Chemical Properties ◽

Building Blocks ◽

Synthesis And Characterization ◽

Next Generation ◽

Design Synthesis ◽

Thermally Induced ◽

Potential Applications ◽

External Stimuli ◽

Physical And Chemical

Metal-organic Frameworks (MOFs) remain an extremely active area of research given the wide variety of potential applications and the enormous diversity of structures that can be created from their constituent building blocks. While MOFs are typically employed as passive materials, next-generation materials will exhibit structural and/or electronic changes in response to applied external stimuli including light, charge, and pH. Herein we present recent results in which advanced photochromic diarylethenes are combined with MOFs through covalent and non-covalent methods to create photo-responsive permanently porous crystalline materials. This presentation will describe the design, synthesis, and characterization of next-generation photo-switchable diarylethene based ligands which are subsequently used to photo-responsive MOFs. These UBMOF crystals are, by design, isostructural with previously reported non-photoresponsive frameworks which enables a systematic comparison of their physical and chemical properties. While the photoswitching of the isolated ligand in solution is fully reversible, the cycloreversion reaction is suppressed in the UBMOF single crystalline phase. Spectroscopic evidence for thermally induced cycloreversion will be presented, as well as a detailed analysis addressing the limits of X-ray diffraction techniques applied to these systems.

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Geometry of Multiprimary Display Colors II: Metameric Control Sets and Gamut Tiling Color Control Functions

10.36227/techrxiv.14576325.v1 ◽

2021 ◽

Author(s):

Carlos Rodriguez-Pardo ◽

Gaurav Sharma

Keyword(s):

Broad Class ◽

Convex Polytope ◽

Building Blocks ◽

Complete Characterization ◽

Mathematical Framework ◽

Control Functions ◽

Control Sets ◽

Multiple Alternative ◽

Color Control

<div>For multiprimary displays that have four or more primaries, a color may be reproduced using multiple alternative control vectors. We provide a complete characterization of the Metameric Control Set (MCS), i.e., the set of control vectors that reproduce a given color on the display. Specifically, we show that MCS is a convex polytope whose vertices are control vectors obtained from (parallelepiped) tilings of the gamut, i.e., the range of colors that the display can produce. The mathematical framework that we develop: (a) characterizes gamut tilings in terms of fundamental building blocks called facet spans, (b) establishes that the vertices of the MCS are fully characterized by the tilings of the gamut, and (c) introduces a methodology for the efficient enumeration of gamut tilings. The framework reveals the fundamental inter-relations between the geometry of the MCS and the geometry of the gamut developed in a companion Part I paper, and provides insight into alternative strategies for color control. Our characterization of tilings and the strategy for their enumeration also advance knowledge in geometry, providing new approaches and computational results for the enumeration of tilings for a broad class of zonotopes in R<sup>3</sup>.</div>

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MUTUAL COUPLING COEFFICIENTS OF ROTATING RECTANGULAR DIELECTRIC RESONATORS IN CUT-OFF RECTANGULAR WAVEGUIDE

Information and Telecommunication Sciences ◽

10.20535/2411-2976.12021.48-54 ◽

2021 ◽

pp. 48-54

Author(s):

Alexander Trubin

Keyword(s):

Transmission Lines ◽

Rectangular Waveguide ◽

Information Transfer ◽

Dielectric Resonators ◽

Coupling Coefficients ◽

Metal Waveguide ◽

Communication Devices ◽

Dielectric Filter ◽

Analytical Formulas ◽

Analytical Expressions

Background. A further increase in the speed of information transfer is determined by more stringent requirements for the elements of communication devices. One of the most important components of such devices is various filters, which are often made on the basis of dielectric resonators. Calculation of the parameters of multi-section filters is impossible without further development of the theory of their design. The development of filter theory is based on electrodynamic modelling, which involves calculating the coupling coefficients of dielectric resonators in various transmission lines. Objective. The aim of the research is to calculate and study the coupling coefficients of rectangular dielectric resonators with a rectangular metal waveguide when their axes rotate. Investigation of new effects to improve the performance of filters and other devices based on them. Methods. Methods of technical electrodynamics are used to calculate and analyse the coupling coefficients. The end result is to obtain new analytical formulas for new structures with rectangular dielectric resonators, which make it possible to analyse and calculate their coupling coefficients. Results. New analytical expressions are found for the coupling coefficients of dielectric resonators with the rotation of their axes in a rectangular waveguide. Conclusions. The theory of designing filters based on new structures of dielectric resonators with rotation of their axes in metal waveguides has been expanded. New analytical relationships and new patterns of change in the coupling coefficients are found. Keywords: dielectric filter; rectangular dielectric resonator; rotation; coupling coefficients.

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Synthesis and characterization of new tetra-substituted porphyrins with exo-donor carboxylic groups as building blocks for supramolecular architectures: Catalytic and structural studies of their metalated derivatives

Journal of Porphyrins and Phthalocyanines ◽

10.1142/s1088424610002641 ◽

2010 ◽

Vol 14 (09) ◽

pp. 804-814 ◽

Cited By ~ 4

Author(s):

Lucia Carlucci ◽

Gianfranco Ciani ◽

Simona Maggini ◽

Davide M. Proserpio ◽

Fabio Ragaini ◽

...

Keyword(s):

Building Blocks ◽

Supramolecular Organization ◽

Silver Complexes ◽

Structural Studies ◽

Polymeric Compound ◽

X Ray ◽

X Ray Crystallography ◽

Supramolecular Architectures ◽

Carboxylic Groups

We report herein the synthesis of the porphyrins 5,10,15,20-tetrakis(4-carboxybiphenyl)-porphyrin (H2TCBP) and 5,10,15,20-tetrakis(4-carboxy-2,6-dimethylbiphenyl)porphyrin (H2TCDMBP) bearing diphenyl units on meso-positions, and of their cobalt and silver derivatives. The silver complexes of H2TCDMBP and of H2TCPP ( H2TCPP = 5 ,10,15,20-tetrakis(4-carboxyphenyl)porphyrin) were investigated by X-ray crystallography and their supramolecular organization elucidated. Co(TCBP) was reacted with copper formate, yielding a polymeric compound that showed a catalytic activity in the benzylic amination of hydrocarbons using arylazide as aminating agent.

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