Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 28 for “"Loss Tangent"”.
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Thin Film Polymer Dielectrics for High-Voltage Applications under Severe Environments
… leakage current), low dielectric constant, low loss tangent, high glass transition temperature, and low surface roughness. The use of these polymers allows for advanced electronic packaging techniques, resulting in improved system performance and reliability. Research was performed using a …
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Micromachined transmission lines for microwave applications
… first time that the dielectric constant and the loss tangent of SU-8 are measured in the millimeter-wave frequency region. <br>Micromachining techniques applied to microwave transmission lines were limited to planar ones, like microstrip or coplanar lines. In this work the property of …
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Enabling Hybrid Optical-Microwave Space Communications with Optically Transparent RF Components Using Indium Tin Oxide (ITO)
… ITO, including conductivity, permittivity, and loss tangent, and ensured the material's suitability for space conditions and electrical conductivity. The ITO films achieved an average permittivity of 7.16 in the range of 5-10 GHz, a DC conductivity of 6.86 MS/m, and a CPW loss tangent of 0.0054 …
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Design, fabrication and characterization of sub-THz components in glass interposer substrates
… results (dielectric constant and loss tangent) for glass interposers and presents the design, fabrication, and measurements for RF interconnects (microstrip lines, CPWs and SIWs) on glass interposers up to 170 GHz. This work also presents a new class of filters in SIW technology …
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Dielectric Characterization: A 3D EM Simulation Approach
… solution process, the dielectric constant and loss tangent can be found. With further development, the 3D simulation results may be used to replace the need for complex theoretical analysis of the measurement geometry. The method is applied to an X-band rectangular waveguide setup, for which …
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Dynamic mechanical analysis of magnetic tapes at ultra-low frequencies
… The elastic modulus (E), storage modulus (E'), loss modulus (E"), and loss tangent (tan 8) were obtained from the time delay for each of the DMA experiments</p>
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Advanced Manufacturing and Dielectric Material Characterization Techniques for High-Temperature mm-Wave Antennas
… air pocket slots in the CPW structure, the loss tangent of the material can be determined by extracting the attenuation constant at various depths. To verify this methodology, a mathematical model is developed for CPW structures with air pocket slots, supported by finite element method (FEM) …
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DENSE 3D HETEROGENEOUS INTEGRATION USING SELECTIVE COBALT ALD DEPOSITION AND RECONSTITUTED TIERS
… stacking, the SiO2 approach can have smaller loss tangent (10x), lower CTE mismatch (3x) and the higher via density (>400x). The thickness of the proposed technology can be over 10 times smaller than conventional epoxy molding. The two technologies, with further analysis and studies, open up …
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Large-Signal Characterization of Piezoelectric Resonators for Power Conversion
… data to more completely characterize the losses in piezoelectric resonators owing to both mechanical and dielectric effects. To account for mechanical losses, the variation in resonator quality factor is examined across a range of drive levels for multiple resonator sizes, frequencies, and …
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Dielectric characterization of materials and lossy filter design using reflected group delay
… requirements but at the cost of large size. Low loss in these filter technologies can be identified by their high quality factor (Q-factor). Higher insertion loss (lower Q-factor) in the filter response is acceptable based on the communication system using that filter and its position in that …
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Dynamic viscoelastic properties of advanced magnetic tapes
… then used to determine the storage modulus (E'), loss modulus (E"), and the loss tangent (tan 8). These viscoelastic characteristics of the material were determined for each individual experimental sample. The combined data was then used to create comparative plots of each sample type allowing for …
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Modeling aperture radiation for RF interference applications
… proposes a physical-based model of conductive loss for impedance of power/ground plane pair and metal enclosure. Loss tangent tern in complex wave number is formulated by the stored energy and energy loss of each resonant mode, which provide more physical insight than traditional skin effect …
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Radio-echo layering in polar ice sheets
… mechanisms: changes in (a) ice density, and (b) loss tangent. Supporting density and conductivity data from ice cores are summarised. It is concluded that most layer echoes arise from layers of ice containing acidic impurities of volcanic origin~ Layer reflectivity variations_are observed over …
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A Silicate-Based Packaging Material for 3-D Heterogeneous Integration of Microsystems
… from 50 - 400°C, and the dielectric constant and loss tangent were ~4 and ~0.0002 at 110 GHz. Successful fabrication of a coplanar waveguide and prototype reconstituted wafers demonstrated that the packaging material can be used to make RF devices and to enable 3D HI and WLP.
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Influence of the Interphase on the Mechanical Properties of Nylon 66 Composites
… adhesion testing showed similar effects in the loss tangent of both composites versus fiber sizing. In addition, uni-axial tensile testing revealed an increase in the ultimate strength and toughness of both composites. On the other hand, neither the ultimate strain or modulus was a strong …
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Microwave ring resonator based on thermoplastic substrate for chicken breast meat quality identification application
… the PLA substrate’s dielectric constant (ε′) and loss tangent (tan δ) were found to be 2.26 and 0.0001 at 1.1 GHz, respectively, while ε′ for the fresh CBM was 55.23 and ε′ for the aged CBM was 49.43. The MRR was designed at 1.1 GHz and simulated between 1 GHz to 1.2 GHz. The newly developed MRR …
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Transient moisture effects on the viscoelasticity of synthetic fibers and composites
… in storage modulus, and an increase in the loss tangent (Tan δ) when compared to coupons maintained at a constant (saturated) moisture content. However, the transient moisture effects were not seen in composite coupons along the matrix direction. Experimental results showed that aramid …
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An investigation of nanoscale materials and their incorporation in patch antenna for high frequency applications
… has complex permittivity of 1.36±5% and a loss tangent of 2.4E-04±4.8E-04 which was measured using Spilt-Post Dielectric Resonators (SPDR) technique at National Physics Laboratory, Teddington, London. A diamond-shaped MPAs on RT Duriod material were simulated and fabricated using …
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Planar groove gap waveguides
… conducting planes, while still providing a low loss planar transmission medium. Simulation results demonstrate the existence of a TE10 propagating mode within the artificially created bandgap. There is good agreement between de-embedded simulated and measured results over the usable bandwidth of …
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Ink jet printing of PZT thin films for MEMS
… permittivity (750-890) and the dielectric loss tangent (2.4%-2.8%). The final printing process enabled the first digital deposition of thin film PZT and the printed PZT based pMUT confirmed the properties of the film are within the range required for a high performance piezoelectric MEMS …
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