Novel MNZ-type microwave sensor for testing magnetodielectric materials

Abstract A novel microwave sensor with the mu-near-zero (MNZ) property is proposed for testing magnetodielectric material at 4.5 GHz. The sensor has a double-layer design consisting of a microstrip line and a metal strip with vias on layers 1 and 2, respectively. The proposed sensor can detect a unit change in relative permittivity and relative permeability with a difference in the operating frequency of 45 MHz and 78 MHz, respectively. The MNZ sensor is fabricated and assembled on two layers of Taconic RF-35 substrate, with thicknesses of 0.51 mm and 1.52 mm, respectively, for the measurement of the sample under test using a vector network analyzer. The dielectric and magnetic properties of two standard dielectric materials (Taconic CER-10 and Rogers TMM13i) and of yttrium–gadolinium iron garnet are measured at microwave frequencies. The results are found to be in good agreement with the values available in the literature, which shows the applicability of the prototype for sensing of magnetodielectric materials.

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A Defected Structure Shaped CPW-Fed Wideband Microstrip Antenna for Wireless Applications

Journal of Engineering ◽

10.1155/2016/2863508 ◽

2016 ◽

Vol 2016 ◽

pp. 1-7 ◽

Cited By ~ 9

Author(s):

Puneet Khanna ◽

Amar Sharma ◽

Kshitij Shinghal ◽

Arun Kumar

Keyword(s):

Patch Antenna ◽

High Frequency ◽

Microstrip Antenna ◽

Microstrip Line ◽

Coplanar Waveguide ◽

Network Analyzer ◽

Large Space ◽

Wireless Applications ◽

High Frequency Structure Simulator ◽

Good Agreement

A coplanar waveguide- (CPW-) fed compact wideband defected structure shaped microstrip antenna is proposed for wireless applications. Defected structure is produced by cutting theUshape antenna in the form of two-sided T shape. The proposed antenna consists of two-sidedTshape strip as compared to usual monopole patch antenna for minimizing the height of the antenna. The large space around the radiator is fully utilized as the ground is on the same plane as of radiator. Microstrip line feed is used to excite the proposed antenna placed on an FR4 substrate (dielectric constantεr=4.4). The antenna is practically fabricated and simulated. Simulated results of the proposed antenna have been obtained by using Ansoft High-Frequency Structure Simulator (HFSS) software. These results are compared with measured results by using network analyzer. Measured result shows good agreement with the simulated results. It is observed that the proposed antenna shows a wideband from 2.96 GHz to 7.95 GHz with three bands atf1=3.23 GHz,f2=4.93 GHz, andf3=7.04 GHz.

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A New Planar Microwave Sensor for Building Materials Complex Permittivity Characterization

Sensors ◽

10.3390/s20216328 ◽

2020 ◽

Vol 20 (21) ◽

pp. 6328

Author(s):

João G. D. Oliveira ◽

José G. Duarte Junior ◽

Erica N. M. G. Pinto ◽

Valdemir P. Silva Neto ◽

Adaildo G. D’Assunção

Keyword(s):

Relative Permittivity ◽

Building Materials ◽

Dielectric Materials ◽

Line Of Sight ◽

Scattering Parameters ◽

Microwave Sensor ◽

Sensor Structure ◽

Measurement Results ◽

Concrete Blocks ◽

The Difference

A new microwave sensor is proposed to characterize the complex relative permittivity of building non-magnetic materials and used in the characterization of three concrete samples. The proposed sensor structure consists of a log-periodic planar antenna with microstrip elements tilted forward by an angle β and printed, alternately, on the top and bottom sides of a dielectric layer. The operation principle is based on the measurement of the scattering parameters S11 and S21 in a free space propagation transmitter-receiver setup, for both cases with the material under test (MUT) sample (non-line-of-sight, NLOS) and without it (line-of-sight, LOS). A prototype is fabricated and measured to determine the scattering parameters of concrete samples. After measurements, the obtained results are used in the efficient and accurate Nicolson–Ross–Weir (NRW) method, making it possible to estimate the values of the complex relative permittivity of the concrete blocks. The sensor design is demonstrated from initial simulations to measurements for validation of the developed prototype. The obtained results for the complex relative permittivity of concrete are in agreement with those available in the literature and the difference between the simulated and measurement results for the sensor antenna resonant frequency is 4.71%. The used measurement setup can be applied to characterize different types of solid or liquid dielectric materials.

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Wideband four-element two-segment triangular dielectric resonator antenna with monopole-like radiation

International Journal of Microwave and Wireless Technologies ◽

10.1017/s1759078715001622 ◽

2015 ◽

Vol 9 (2) ◽

pp. 411-418 ◽

Cited By ~ 1

Author(s):

Ravi Kumar Gangwar ◽

Pinku Ranjan ◽

Abhishek Aigal

Keyword(s):

Resonant Frequency ◽

Dielectric Resonator ◽

Return Loss ◽

Simulation Software ◽

Network Analyzer ◽

Dielectric Resonator Antenna ◽

Microwave Frequencies ◽

Ansoft Hfss ◽

Coaxial Probe ◽

Good Agreement

In this paper, a wideband two-segmented four-element triangular dielectric resonator antenna (TDRA) with coaxial probe feed has been proposed. The proposed antenna has been analyzed, optimized, and studied through Ansoft HFSS simulation software. The prototype of the proposed antenna has been fabricated and its input characteristics are measured with the help of R&S Vector Network Analyzer. Good agreement has been obtained between simulated and measured results. The proposed design has been compared with two segments TDRA and found wider bandwidth with lower resonant frequency. The proposed antenna provides monopole-like radiation pattern over the entire bandwidth with nearly 33% bandwidth (return loss ≥10 dB) at a resonant frequency 6.9 GHz and 4.93 dBi peak gain. The proposed antenna is suitable for application of C-band microwave frequencies.

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Magnetic Properties and Growth‐Induced Anisotropy in Yttrium Thulium Iron Garnet Thin Films

Advanced Electronic Materials ◽

10.1002/aelm.202100452 ◽

2021 ◽

pp. 2100452

Author(s):

Ethan R. Rosenberg ◽

Kai Litzius ◽

Justin M. Shaw ◽

Grant A. Riley ◽

Geoffrey S. D. Beach ◽

...

Keyword(s):

Thin Films ◽

Magnetic Properties ◽

Induced Anisotropy ◽

Iron Garnet

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Macrosegregation of Y2Ba1Cu1O5 particles in Y1Ba2Cu3O7−δ crystals grown by an undercooling method

Journal of Materials Research ◽

10.1557/jmr.1996.0096 ◽

1996 ◽

Vol 11 (4) ◽

pp. 795-803 ◽

Cited By ~ 137

Author(s):

A. Endo ◽

H. S. Chauhan ◽

T. Egi ◽

Y. Shiohara

Keyword(s):

Growth Rate ◽

Flux Pinning ◽

Faraday Effect ◽

Growth Direction ◽

Pinning Force ◽

Garnet Film ◽

Iron Garnet ◽

Flux Pinning Force ◽

Good Agreement ◽

Iron Garnet Film

Macrosegregation of Y2Ba1Cu1O5 (Y211) particles was observed in Pt-added Y1Ba2Cu3O7−δ (Y123) crystals grown by an undercooling method. It was found that the macrosegregation of Y211 particles depended on the growth direction and the growth rate (R) as a function of undercooling (ΔT). The amount of Y211 particles in Y123 crystals grown at large R was larger than at small R. Also, the amount of Y211 in Y123 growing along the a-direction was larger than that along the c-direction. Further, it was noted that the smaller Y211 particles in size were distributed in Y123 grown at large R. These phenomena could be at least qualitatively explained by the prevalent trapping/pushing theory. In the direct observation of magnetic flux with the Faraday effect of iron garnet film, the flux pinning force was found to be in good agreement with the macrosegregation of Y211 particles.

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Annealing Effects on the Physical and Magnetic Properties of Tb1.5Y1.5Fe5O12 Films Nanoparticles Prepared by Sol-Gel Method

Materials Science Forum ◽

10.4028/www.scientific.net/msf.756.91 ◽

2013 ◽

Vol 756 ◽

pp. 91-98 ◽

Cited By ~ 2

Author(s):

Ftema W. Aldbea ◽

Noor Bahyah Ibrahim ◽

Mustafa Hj. Abdullah

Keyword(s):

Particle Size ◽

Magnetic Properties ◽

Annealing Temperature ◽

Quartz Substrate ◽

Sol Gel ◽

Lattice Parameter ◽

Gel Method ◽

X Ray ◽

Sol Gel Method ◽

Iron Garnet

Terbium –substituted yttrium iron garnet (Tb1.5Y1.5Fe5O12) films nanoparticles were successfully prepared by a sol-gel method. The films were deposited on the quartz substrate using spin coating technique. To study effect of annealing temperature, the annealing process was executed at 700, 800 and 900 °C in air for 2 hours. The X-ray diffraction (XRD) proved that the pure phase of garnet structure was detected for the film annealed at 900 °C. The lattice parameter increased with the increment of annealing temperature and the highest value of 12.35 Å was obtained at 900 °C. Field Emission Scanning Electron Microscope (FE-SEM) results showed that the particle size increased from 43nm to 56nm as annealing temperature increased from 700 to 900°C. The film’s thickness also affected by increasing of annealing temperature and become thin at 900 °C due to densification process occurred at high annealing temperature. The elemental compositions of the Tb1.5Y1.5Fe5O12 film were detected using an Energy Dispersive X-raySpectroscopy (EDX). Magnetic properties at room temperature were measured using a Vibrating Sample Magnetometer (VSM).The saturation magnetization Ms increased with the annealingtemperature and showed a high value of 104emu/cm3, but the coercivity Hc of the film was decreased due to the increment of the particle size. Normal 0 21 false false false MS X-NONE X-NONE MicrosoftInternetExplorer4 Terbium –substituted yttrium iron garnet (Tb1.5Y1.5Fe5O12) films nanoparticles were successfully prepared by a sol-gel method. The films were deposited on the quartz substrate using spin coating technique. To study effect of annealing temperature, the annealing process was executed at 700, 800 and 900°C in air for 2 hours. The X-ray diffraction (XRD) proved that the pure phase of garnet structure was detected for the film annealed at 900 °C. The lattice parameter increased with the increment of annealing temperature and the highest value of 12.35 Å was obtained at 900 °C. Field Emission Scanning Electron Microscope (FE-SEM) results showed that the particle size increased from 43nm to 56nm as annealing temperature increased from 700 to 900 °C. The film’s thickness also affected by increasing of annealing temperature and become thin at 900 °C due to densification process occurred at high annealing temperature. The elemental compositions of the Tb1.5Y1.5Fe5O12 film were detected using an Energy Dispersive X-ray Spectroscopy (EDX). Magnetic properties at room temperature were measured using a Vibrating Sample Magnetometer (VSM).The saturation magnetization Ms increased with the annealing temperature and showed a high value of 104emu/cm3, but the coercivity Hc of the film was decreased due to the increment of the particle size. st1\:*{behavior:url(#ieooui) } /* Style Definitions */ table.MsoNormalTable {mso-style-name:"Table Normal"; mso-tstyle-rowband-size:0; mso-tstyle-colband-size:0; mso-style-noshow:yes; mso-style-priority:99; mso-style-qformat:yes; mso-style-parent:""; mso-padding-alt:0cm 5.4pt 0cm 5.4pt; mso-para-margin:0cm; mso-para-margin-bottom:.0001pt; mso-pagination:widow-orphan; font-size:11.0pt; font-family:"Calibri","sans-serif"; mso-ascii-font-family:Calibri; mso-ascii-theme-font:minor-latin; mso-fareast-font-family:"Times New Roman"; mso-fareast-theme-font:minor-fareast; mso-hansi-font-family:Calibri; mso-hansi-theme-font:minor-latin; mso-bidi-font-family:"Times New Roman"; mso-bidi-theme-font:minor-bidi;}

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XXXIX.—Magnetic Quality in the most open Cubic Arrangement of Molecular Magnets.

Proceedings of the Royal Society of Edinburgh ◽

10.1017/s0370164600011913 ◽

1908 ◽

Vol 28 ◽

pp. 643-651 ◽

Cited By ~ 2

Author(s):

W. Peddie

Keyword(s):

Magnetic Properties ◽

Molecular Magnets ◽

Molecular Arrangement ◽

Good Agreement

In a former paper (Proc. R.S.E., 1905) an investigation was given of the magnetic properties of the closest packed homogeneous cubic arrangement of molecular magnets, and it was found that the results were in good agreement with the observed properties of crystals of magnetite. It was also suggested that a parallel investigation of other cubic arrangements might lead to a discrimination of molecular arrangement, so far as the magnetic constituents are concerned, in actual crystals. To settle this point, if possible, the present investigation was undertaken.

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