$W$ -Band Complex Permittivity Measurements at High Temperature Using Free-Space Methods

Hilario, Martin S.; Hoff, Brad W.; Jawdat, BenMaan I.; Lanagan, Michael T.; Cohick, Zane; Dynys, Fred; Mackey, Jeffrey R.; Gaone, Joseph M.

doi:10.1109/tcpmt.2019.2912837

Cited by 27 publications

(10 citation statements)

References 82 publications

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“…The percentage increase in imaginary permittivity was found to be greater (approximately 50%) in the lowest concentration samples (0.25 vol% and 0.5 vol% Mo), compared with approximately 15% in the 4.0 vol% Mo. However, because of the lower starting values of e0 r for the lowest concentration samples, small changes in the dielectric loss of the matrix material occurring at all Mo concentrations would have proportionally greater contributions to changes in the lossyness of the additive [27]. The exponential dependence of real and imaginary permittivity on Mo concentration in the evaluated range (0.25 vol% to 4 vol% Mo) enables substantial tunability of the electromagnetic properties of the composite with small changes in composite formulation.…”

Section: High-temperature W-band Dielectric Property Analysismentioning

confidence: 78%

Characterization of AlN-based ceramic composites for use as millimeter-wave susceptor materials at high temperature: Dielectric properties of AlN:Mo with 0.25 vol% to 4.0 vol% Mo from 25 to 550 °C

et al. 2019

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Section: High-temperature W-band Dielectric Property Analysismentioning

confidence: 78%

Characterization of AlN-based ceramic composites for use as millimeter-wave susceptor materials at high temperature: Dielectric properties of AlN:Mo with 0.25 vol% to 4.0 vol% Mo from 25 to 550 °C

et al. 2019

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“…Mm-wave field spectra of the photonic limiter and complex permittivities of its constitutive components were obtained using a W -band, high-temperature, free-space measurement apparatus ( 46 ). The measurement system consisted of an Agilent 5222A performance network analyzer (PNA), N5261A millimeter head controller, and a set of OML V10VNA-T/R frequency extender heads (one for each port) serving to boost the output of the PNA base unit to the W -band frequencies (75 to 110 GHz).…”

Section: Methodsmentioning

confidence: 99%

A reflective millimeter-wave photonic limiter

et al. 2022

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“…Mm-wave spectral measurements. Mm-wave field spectra of the photonic limiter and complex permittivities of its constitutive components were obtained using a W -band, hightemperature, free-space measurement apparatus [38]. The measurement system consisted of an Agilent 5222A performance network analyzer (PNA), N5261A millimeter head controller, and a set of OML V10VNA-T/R frequency extender heads (one for each port) serving to boost the output of the PNA base unit to W -band frequencies (75-110 GHz).…”

Section: Methodsmentioning

confidence: 99%

A reflective mm-wave photonic limiter

Kononchuk,

Suwunnarat,

Hilario

et al. 2020

Preprint

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Millimeter wave (mm-wave) communications and radar receivers capable of processing small signals must be protected from high-power signals, which can damage sensitive receiver components.Many of these systems arguably can be protected by using photonic limiting techniques, in addition to electronic limiting circuits in receiver front-ends. Here we demonstrate, experimentally and numerically, a free-space, reflective mm-wave limiter based on a multilayer structure involving a nanolayer of vanadium dioxide (VO 2 ), experiencing a thermal insulator-to-metal transition. The multilayer acts as a variable reflector, controlled by the input power. At low input power levels, VO 2 remains dielectric, and the multilayer exhibits resonant transmittance. When the input power exceeds a threshold level, the emerging metallic phase renders the multilayer highly reflective while dissipating a small portion of the input power without damage to the limiter. In the case of a Gaussian beam, the limiter has a nearly constant output above the limiting threshold input.Millimeter wave (mm-wave) is a valuable network and sensing technology which utilizes frequency bands in between 30 GHz and 300 GHz [1][2][3]. Operating in this spectral range has important advantages over lower frequency bands. Not only do mm-waves allow larger bandwidths to transmit data at multi-gigabit speeds [4], they also provide higher spatial resolution due to shorter wavelengths, which can be exploited for a variety of accurate sensing applications [5]. Another advantage of mm-wavelengths is that the size of system components required to receive and process mm-wave signals is small enough to allow using standard optical techniques [6][7][8][9][10][11][12].Optical limiting is a technique to protect photosensitive devices from damage caused by intense optical radiation [13,14]. Optical limiters are therefore designed to block highintensity laser radiation while transmitting low-intensity light. Most passive optical limiters utilize materials with nonlinear absorption, which are transparent to low-intensity light but turn opaque if the light intensity exceeds a certain (limiting) threshold level [15][16][17].However, a typical passive limiter absorbs a significant portion of high-level radiation, which can cause overheating and damage to the limiter itself [14,18].To overcome this problem, the concept of a reflective photonic limiter, which reflects rather than absorbs high-intensity radiation, has been introduced [19][20][21]. A passive reflective photonic limiter involves a photonic bandgap structure, such as a multilayer cavity,

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$W$ -Band Complex Permittivity Measurements at High Temperature Using Free-Space Methods

Cited by 27 publications

References 82 publications

Characterization of AlN-based ceramic composites for use as millimeter-wave susceptor materials at high temperature: Dielectric properties of AlN:Mo with 0.25 vol% to 4.0 vol% Mo from 25 to 550 °C

Characterization of AlN-based ceramic composites for use as millimeter-wave susceptor materials at high temperature: Dielectric properties of AlN:Mo with 0.25 vol% to 4.0 vol% Mo from 25 to 550 °C

A reflective millimeter-wave photonic limiter

A reflective mm-wave photonic limiter

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