Low-cost planar coupled-line sensor for permittivity measurement of low-loss dielectric materials in a wide frequency range

2017 ◽  
Author(s):  
Ilona Piekarz ◽  
Konrad Janisz ◽  
Jakub Sorocki ◽  
Krzysztof Wincza ◽  
Slawomir Gruszczynski
Keyword(s):  
Low Cost ◽  
Dielectric Materials ◽  
Wide Frequency Range ◽  
Frequency Range ◽  
Low Loss ◽  
Coupled Line ◽  
Permittivity Measurement

LOW LOSS DIELECTRIC MATERIALS FOR HIGH FREQUENCY APPLICATIONS

2009 ◽  
Vol 23 (17) ◽  
pp. 3649-3654 ◽  
Author(s):  
MOHAN V. JACOB
Keyword(s):  
High Frequency ◽  
Room Temperature ◽  
Low Cost ◽  
Dielectric Materials ◽  
Dielectric Constants ◽  
Transmission Losses ◽  
Low Loss ◽  
Microwave Characterization ◽  
Materials Used ◽  
Low Temperature Electronics

The microwave properties of some of the low cost materials which can be used in high frequency applications with low transmission losses are investigated in this paper. One of the most accurate microwave characterization techniques, Split Post Dielectric Resonator technique (SPDR) is used for the experimental investigation. The dielectric constants of the 3 materials scrutinized at room temperature and at 10K are 3.65, 2.42, 3.61 and 3.58, 2.48, 3.59 respectively. The corresponding loss tangent values are 0.00370, 0.0015, 0.0042 and 0.0025, 0.0009, 0.0025. The high frequency transmission losses are comparable with many of the conventional materials used in low temperature electronics and hence these materials could be implemented in such applications.

scholarly journals LOW-COST, INTELLIGENT DATA ACQUISITION SYSTEM FOR QCM AND OTHER RESONATOR-BASED BIO- AND CHEMICAL SENSORS

2014 ◽  
pp. 9-17
Author(s):  
Sergey Y. Yurish
Keyword(s):  
Data Acquisition ◽  
Integrated Circuit ◽  
Low Cost ◽  
Data Acquisition System ◽  
Wide Frequency Range ◽  
Acquisition System ◽  
Bulk Acoustic Wave ◽  
Frequency Range ◽  
Modified Method ◽  
Intelligent Data Acquisition

A low-cost, intelligent data acquisition system for quartz crystal microbalance (QCM) and other (superficial SAW and bulk acoustic wave) resonator-based chemical and biosensors described in this article. The system is based on the novel modified method of the dependent count and allows obtaining high metrological performances: programmable and constant in all frequency range relative error of measurement up to 0,0005 % (5 ppm); nonredundant, reduced conversion time of measurement and wide frequency range from 0.05 Hz to 9 MHz (144 MHz with prescaling). The developed system allows measuring variations of the resonance frequency shift for QCM sensors working in liquids and gases. The described low-cost data acquisition system is based on novel integrated circuit of universal frequency-to-digital converter. This design approach has eliminated much of the hardware: there is no need for a microcontroller and complex sensor interfacing electronics, as it is directly compatible with PC computers.

scholarly journals Uniplanar Millimeter-Wave Log-Periodic Dipole Array Antenna Fed by Coplanar Waveguide

2013 ◽  
Vol 2013 ◽  
pp. 1-5 ◽  
Author(s):  
Guohua Zhai ◽  
Yong Cheng ◽  
Qiuyan Yin ◽  
Shouzheng Zhu ◽  
Jianjun Gao
Keyword(s):  
Integrated Circuits ◽  
Millimeter Wave ◽  
Return Loss ◽  
Low Cost ◽  
Coplanar Waveguide ◽  
Antenna Gain ◽  
Low Loss ◽  
Coupled Line ◽  
Field Patterns ◽  
Communication Circuits

A uniplanar millimeter-wave broadband printed log-periodic dipole array (PLPDA) antenna fed by coplanar waveguide (CPW) is introduced. This proposed structure consists of several active dipole elements, feeding lines, parallel coupled line, and the CPW, which are etched on a single metallic layer of the substrate. The parallel coupled line can be optimized to act as a transformer between the CPW and the PLPDA antenna. Meanwhile, this transform performs the task of a balun to achieve a wideband, low cost, low loss, simple directional antenna. The uniplanar nature makes the antenna suitable to be integrated into modern printed communication circuits, especially the monolithic millimeter-wave integrated circuits (MMIC). The antenna has been carefully examined and measured to present the return loss, far-field patterns, and antenna gain.

scholarly journals High refractive index and extreme biaxial optical anisotropy of rhenium diselenide for applications in all-dielectric nanophotonics

Nanophotonics ◽  
2020 ◽  
Vol 9 (16) ◽  
pp. 4737-4742
Author(s):  
Anton A. Shubnic ◽  
Roman G. Polozkov ◽  
Ivan A. Shelykh ◽  
Ivan V. Iorsh
Keyword(s):  
Refractive Index ◽  
Dimensionless Parameter ◽  
Dielectric Materials ◽  
High Refractive Index ◽  
Wide Frequency Range ◽  
Visible Range ◽  
Low Loss ◽  
Optical Susceptibility ◽  
Valence Bands ◽  
Rhenium Diselenide

AbstractWe establish a simple quantitative criterium for the search of new dielectric materials with high values of refractive index in the visible range. It is demonstrated, that for light frequencies below the bandgap, the latter is determined by the dimensionless parameter η calculated as the ratio of the sum of the widths of conduction and valence bands and the bandgap. Small values of this parameter, which can be achieved in materials with almost flat bands, lead to dramatic increase of the refractive index. We illustrate this rule with a particular example of rhenium dichalcogenides, for which we perform ab initio calculations of the band structure and optical susceptibility and predict the values of the refractive index $n{ >}5$ in a wide frequency range around 1 eV together with comparatively low losses. Our findings open new perspectives in search for the new high-index/low-loss materials for all-dielectric nanophotonics.

scholarly journals Design of photonic crystal horn antenna for transverse electric modes

2020 ◽  
Vol 50 (3) ◽  
Author(s):  
Ehsan Beiranvand ◽  
Mohammad Danaie ◽  
Majid _Afsahi
Keyword(s):  
Photonic Crystal ◽  
Low Cost ◽  
Hexagonal Lattice ◽  
Fdtd Method ◽  
Horn Antenna ◽  
Frequency Range ◽  
Low Loss ◽  
Circular Holes ◽  
Two Dimensional Photonic Crystal ◽  
Difference Time

In this paper, by modifying defects in a photonic crystal lattice, a two-dimensional photonic crystal horn antenna is designed. The photonic crystal used for this purpose is composed of a hexagonal lattice of circular holes in a dielectric slab. The results of this paper allow us to design a photonic crystal antenna capable of separating TE and TM modes. The designed structure has a very simple design that allows low cost fabrication. The structure is numerically simulated using a finite-difference time-domain (FDTD) method. Its wide bandwidth, its low loss and the ability to transmit waves at a terahertz frequency range are the antenna’s main advantages. The return loss for the frequency range of 180 to 215 THz is from –6.63 to –28.3 dB. Moreover, a 35 THz bandwidth is obtained for this structure.

scholarly journals One-way extraordinary optical transmission with dielectric/perforated metal/antiferromagnetic structure in the terahertz range

2016 ◽  
Vol 94 (8) ◽  
pp. 751-757
Author(s):  
Xiang guang Wang ◽  
Qiang Zhang ◽  
Shu fang Fu ◽  
Yu ling Song ◽  
Xuan zhang Wang ◽  
...  
Keyword(s):  
Optical Transmission ◽  
Effective Medium Theory ◽  
Structural Characteristics ◽  
Dielectric Materials ◽  
Wide Frequency Range ◽  
Terahertz Range ◽  
Frequency Range ◽  
Medium Theory ◽  
Optical Isolators ◽  
The One

The one-way optical effect in a dielectric/perforated metal/antiferromagnetic (DPMA) sandwich structure in the terahertz range is studied. Theoretical modeling, which is based on the effective medium theory and the transmission matrix method, is conducted. The simulation results show that the one-way effect occurs within a wide frequency range and for various incident angles with a fixed external magnetic field. In addition, this behavior is examined for various DPMA structural characteristics, such as different dielectric materials, film thicknesses, and perforated metal hole sizes and spacings. The developed sandwich structures can aid the design of subminiature optical isolators for application in the terahertz range.

scholarly journals THE EFFECT OF FREQUENCY VARIATION ON DIELECTRIC CONSTANT OF RAPHIA HOOKERI

2020 ◽  
Vol 3 (02) ◽  
pp. 53-58
Author(s):  
Ubong Iboh ◽  
Ubong Robert ◽  
Grace Umoren ◽  
Uduakobong Okorie
Keyword(s):  
Dielectric Constant ◽  
Low Cost ◽  
Dielectric Materials ◽  
Raw Material ◽  
Production Cycle ◽  
Frequency Variation ◽  
Frequency Range ◽  
Engineering Applications ◽  
Thermal Insulator ◽  
Raphia Hookeri

This work sought to investigate the effect of varying the frequency of an applied electric field on the dielectric constant of raphia hookeri. The aim of the work was to ascertain the suitability of using the sample for engineering applications. It was revealed, from the recorded results, that the dielectric constant of the sample decays exponentially with frequency. Also, greater degree of polarisation was observed with decrease in frequency. Again, as a good thermal insulator, it was revealed that the values of the sample’s dielectric constant compared favourably with those of commonly used conventional dielectric materials. Thus, it is obvious that if put into production cycle, the sample can serve as a low-cost and environmentally friendly material suitable for engineering applications within audio frequency range. This will, in turn, help to provide raw material for electronic industry and also improve the economy.

scholarly journals Gel-Like Human Mimicking Phantoms: Realization Procedure, Dielectric Characterization and Experimental Validations on Microwave Wearable Body Sensors

Biosensors ◽  
2021 ◽  
Vol 11 (4) ◽  
pp. 111
Author(s):  
Sandra Costanzo ◽  
Vincenzo Cioffi ◽  
Adil Masoud Qureshi ◽  
Antonio Borgia
Keyword(s):  
Low Cost ◽  
Wide Frequency Range ◽  
Frequency Range ◽  
Dielectric Parameters ◽  
Perfect Agreement ◽  
Dielectric Characterization ◽  
Human Arm ◽  
Body Sensors ◽  
Experimental Validations ◽  
5 Ghz

A simple and low-cost procedure for gel-like time-durable biological phantoms is presented in this work. Easily accessible materials are adopted, which are able to provide a flexible and controllable method to rapidly realize different kind of tissues. The proposed technique is applied to fabricate various tissue-mimicking phantoms, namely skin, muscle, blood and fat. Their effectiveness is first tested by performing dielectric characterization on a wide frequency range, from 500 MHz up to 5 GHz, and validating the measured dielectric parameters (dielectric constant and conductivity) by comparison with reference models in the literature. Then, a multi-layer phantom simulating the human arm is realized, and a wearable body sensor is adopted to prove the perfect agreement of the biometric response achieved in the presence of the fabricated phantom and that provided by a real human arm.

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