Ultra thin millimeter-wave absorbers on flexible polyimide substrate utilizing metamaterials are implemented for single and dual frequency bands in an emerging spectrum of 77, 95, 110 GHz. The band absorber is designed using a novel approach imbedding high resonator inside low capable absorbing electromagnetic energy at both 77 GHz simultaneously. total thickness the just 126 μm (almost 1/20th wavelength). Measured peak absorptions 92, 94, 99% 77.2, 94.8, 109.5 GHz, respectively, 92% 94% 109.8

We present experimental results on continuous-wave generation of THz radiation by strained Ge and a theoretical model for population inversion carriers giving rise to the stimulated emission. Resonant acceptor states induced strain resonance hole scattering under applied electric field are necessary inversion.

Magneto-optical approach for the measurements of complex dielectric permittivity and magnetic permeability solid powdered strontium ferrite materials has been performed in Q-, V-, W-band frequency ranges. Free-space quasioptical millimeter-wave spectrometer equipped with a backward-wave oscillator as tunable source coherent radiation provides transmittance spectra transverse field up to 7.5kOe. Frequency dependences parameters ferrites have calculated by matching theoretical curves...

Transmittance measurements on various single crystal ferroelectric and dielectric materials, BaTiO(3), SrTiO(3), LiNbO(3), LiTaO(3), (PbMg(1/3)Nb(2/3)O(3))0.73-(PbTiO(3))0.27, LaAlO(3), Bi(4)Ge(3)O(12), over a broad millimeter-wave (MMW) frequency range have been performed. Frequency dependence of the complex permittivity has measured in MMW region using high-power sources for first time, free-space, quasi-optical spectrometer equipped with backward wave oscillators (BWOs) as coherent...

Complex magnetic permeability and dielectric permittivity of micro- nano-sized powdered barium (BaFe12O19) strontium (SrFe12O19) hexaferrites have been studied in a broadband millimeter wave frequency range (30–120 GHz). Transmittance measurements performed using free-space quasi-optical spectrometer, equipped with set high-power backward oscillators. Real imaginary parts for both types nanoferrites calculated analysis recorded high-precision transmittance spectra. Frequency dependences the...

The broadband dielectric properties of tumorous and nontumorous tissues were analyzed at the millimeter-wave terahertz frequencies. <i xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">Ex-vivo</i> measurements obtained using backward-wave oscillator-based free-space quasi-optical spectroscopy dispersive Fourier transform methods. Both techniques modified to yield real imaginary parts permittivity, absorption coefficient, refractive index, transmission...

Millimeter wave transmittance measurements have been successfully performed on commercial samples of micro- and nano-sized particles BaFe12O19 SrFe12O19 hexaferrite powders BaFeO2 SrFeO2 powders. Broadband millimeter using free space quasi-optical spectrometer, equipped with a set high power backward oscillators covering the frequency range 30 – 120 GHz. Real imaginary parts dielectric permittivity for both types nanoferrites calculated analysis recorded precision spectra. Frequency...

We report a first-time study of complex magnetic permeability and dielectric permittivity 99% pure powdered barium cobalt ferrite (Ba <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2</sub> Co Fe xmlns:xlink="http://www.w3.org/1999/xlink">12</sub> O xmlns:xlink="http://www.w3.org/1999/xlink">22</sub> ) solid hexaferrite ceramics (BaFe xmlns:xlink="http://www.w3.org/1999/xlink">19</sub> in broadband millimeter-wave frequency range. performed...

Ferromagnetic absorption spectra of ɛ-AlxFe2-xO3 powders with various x parameters and densities were obtained using free space quasi-optical spectrometer. Two peaks located at around 95 105 GHz have been found. The corresponds to parameter value 0.66; while the x-parameter 0.49. peak shifts lower frequency increasing parameter. change in resulted intensity. characteristics are repeatable for these specimens prepared even eight months interval. These absorbers composed nanomagnets by sol-gel...

Recently published reports in the literature for bilayer lift-off processes have described recipes patterning of metals that recommended metal-ion-free developers, which do etch aluminum. We report first measurement dissolution rate a commercial resist (LOR) sodium-based buffered developer does not describe reliable recipe is safe multiple process steps thin (<100 nm) and thick aluminum devices with micron-feature sizes. Our consists an acid cleaning substrate, (positive photoresist/LOR)...

Transmittance measurements on diluted barium ferrite materials in broadband millimeter-wave frequency range have been performed. The done using free-space quasi-optical spectrometer transverse magnetic field up to 7.5 kOe. A set of backward wave oscillators used as sources high power coherent radiation tunable 34-120 GHz region. magnetooptical approach has employed for the separation dielectric and effects ferrites simultaneous determination complex permittivity permeability materials. It...

In this paper we present a systematic study of complex dielectric permittivity various semiconductor and materials, including highly absorbing substances, in Q-, V- W-band frequencies. The measurements have been done using broadband quasi-optical millimeter wave spectrometer with backward-wave oscillator (BWO) as non-destructive high power tunable source coherent radiation. Values real imaginary parts materials are calculated from the transmittance spectra. Refractive index data, obtained...

The broadband dielectric properties of tumorous and non-tumorous tissues were analyzed at the microwave, millimeter wave, terahertz ranges. In-vitro measurements obtained using coaxial probe dispersive Fourier transform spectroscopy. Both techniques modified to yield complex real imaginary permittivity, absorption coefficient, refractive index. results reveal characteristic signatures breast display a significant difference in electromagnetic response tissues.

This paper presents a high-resolution high-power free-space dielectric and magnetic measurement technique for evaluating the complex permittivity permeability of solid materials in millimeter waves at room temperature. method enables us to obtain broad-band transmittance spectra using quasi-optical spectrometer equipped with an extended V-band (40-90 GHz) backward-wave oscillator as tunable source coherent radiation. Due sufficiently strong energy throughput transmission very fine frequency...

The imaginary part of complex magnetic permeability spectrum confirms the strong ferromagnetic resonance absorptions to appear at 89 GHz for ε-Al <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">x</sub> Fe xmlns:xlink="http://www.w3.org/1999/xlink">2-x</sub> O xmlns:xlink="http://www.w3.org/1999/xlink">3</sub> nanomagnets prepared by sol-gel techniques x value be 0.66. A anomalous dispersion corresponding is also observed in real spectrum. free...

This paper presents complex dielectric permittivity and magnetic permeability measurements of pure diluted barium ferrites in the millimeter-wave frequency range. A broadband quasi-optical spectroscopy with backward-wave oscillators as high-power tunable sources coherent radiation has been utilized. The real imaginary parts functions are computed from transmittance spectra. magneto-optical approach millimeter waves successfully employed for separation effects simultaneous determination...

Transmittance and reflectance measurements on highly absorbing carbonyl iron materials over a broad millimeter-wave frequency range have been performed. The dependence of the complex dielectric permittivity diluted composite pure powdered has determined in millimeter waves for first time. employed using free-space quasi-optical spectrometer equipped with set high-power backward-wave oscillators as sources coherent radiation, which are tunable from 30 to 120 GHz. A significant transmission...

High-performance millimeter-wave absorber composed of ε-Al <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">x</sub> Fe xmlns:xlink="http://www.w3.org/1999/xlink">2-x</sub> O xmlns:xlink="http://www.w3.org/1999/xlink">3</sub> nanomagnets is prepared by sol-gel techniques. Free space quasi-optical spectrometer equipped with a set tunable backward-wave oscillators as power sources used in this work to study the absorption property series materials....

Transmittance measurements have been performed on La-Co substituted barium hexaferrites in millimeter waves. Broadband millimeter-wave carried out using the free space quasi-optical spectrometer, equipped with a set of high power backward wave oscillators covering frequency range 30 – 120 GHz. Strong absorption zones observed transmittance spectra all due to ferromagnetic resonance. Linear shift resonance as functions substitutions found. Real and imaginary parts dielectric permittivity...

Complex dielectric permittivity data of common materials at Q-, V-, and W-band frequency ranges have been presented. The measurements performed using a free-space quasi-optical millimeter wave spectrometer equipped with backward-wave oscillator as tunable source coherent radiation. Frequency dependences real imaginary parts the calculated from transmittance spectra. We discuss prospective application terahertz imaging spectroscopy for homeland security needs.

This paper presents for the first time complex dielectric permittivity and loss tangent measurements a selection of advanced polymer-based thermoplastics in Q-band, V-band W-band frequencies. These plastics are reported to have exceptional mechanical, thermal electrical properties extensively used as insulating materials, often operating at high voltages. With this view mind, we studied their with high-power sources millimeter wave range. The been performed using broadband quasi-optical...

Ferromagnetic resonance absorptions at 95 GHz (corresponding to x=0.66) and 105 (x=0.49) are found for a series of ε-Al <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">x</sub> Fe xmlns:xlink="http://www.w3.org/1999/xlink">2-x</sub> O xmlns:xlink="http://www.w3.org/1999/xlink">3</sub> nanomagnets prepared by sol-gel techniques. Free-space quasi-optical spectrometer equipped with set tunable backward-wave oscillators as high-power sources is used...

The basic concept of business development is focused on achieving high efficiency projects due to a positive financial result, which implies optimization costs with constant monitoring. analysis the railway transport monopolist company enhances their controlling influence entire process road operation. Conducting strategic cost for operation will ensure high-quality management material, labor and resources company. Strategic operating tools provide viable strategies long-term asset...