Preparation and characterization of cordierite filled PTFE laminates for microwave substrate applications

Murali, K. P.; Rajesh, S.; Jacob, Karl; Prakash, Om; Kulkarni, Ajit R.; Ratheesh, R.

doi:10.1007/s10854-009-9892-5

Cited by 19 publications

(6 citation statements)

References 12 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The dielectric properties of the triboelectric materials, EVA, [ 23 ] and PTFE [ 24 ] are excellent. The dielectric constant of EVA and PTFE remains unchanged with the variation of temperature up to 70 [ 23 ] and 250 °C [ 24 ] respectively.…”

Section: Resultsmentioning

confidence: 99%

A Robust Triboelectric Nanogenerator Resistant to Humidity and Temperature in Ambient Environment

Shankaregowda

Nanjegowda

Guan

et al. 2023

Physica Rapid Research Ltrs

View full text Add to dashboard Cite

Triboelectric nanogenerator (TENG) is an energy harvesting technology from widespread mechanical energy based on the combined effects of triboelectrification and electrostatic induction. TENG devices are promising to be integrated into human daily life and their stability in the ambient environment is quite crucial to guarantee robust output. This requirement is increasing exponentially for powering various wearable/portable electronics and still remains as a challenge. Herein, contact and separation mode‐based, humidity‐ and temperature‐resistant TENG (HT‐TENG) is fabricated utilizing ethylene vinyl acetate and polytetrafluoroethylene tape as frictional layers. By harvesting biomechanical energy, the device could generate peak‐to‐peak open circuit voltage of ≈210 V and short‐circuit current of ≈12.85 μA, respectively. The as‐fabricated device is tolerant to fluctuating relative humidity ranging from 10% to 60% and temperature ranging from 10 to 60 °C. Further, the device is shown to charge 22 and 47 μF commercial capacitors to 3 V using rectifier bridges, glowing light‐emitting diodes, powering digital wrist watches, and a calculator. Thus HT‐TENG as an efficient power source reliably operates not only in typical conditions, but also in desert and frigid environments, thereby extending the applicability and commercialization of the device in the global environments.

show abstract

Section: Resultsmentioning

confidence: 99%

A Robust Triboelectric Nanogenerator Resistant to Humidity and Temperature in Ambient Environment

Shankaregowda

Nanjegowda

Guan

et al. 2023

Physica Rapid Research Ltrs

View full text Add to dashboard Cite

show abstract

“…Therefore, the smaller-sized filler particles occupy less volume, leading to the increased density of the composites. The increase in the density is also due to the higher moisture absorbed by the composites [ 6 , 35 ]. This variation significantly affects the PTFE matrix’s CTE, tensile strength and dielectric properties [ 11 ].…”

Section: Resultsmentioning

confidence: 99%

Effects of Particle Size on the Dielectric, Mechanical, and Thermal Properties of Recycled Borosilicate Glass-Filled PTFE Microwave Substrates

et al. 2021

View full text Add to dashboard Cite

Low dielectric loss and low-cost recycled borosilicate (BRS) glass-reinforced polytetrafluoroethylene (PTFE) composites were fabricated for microwave substrate applications. The composites were prepared through a dry powder processing technique by dispersing different micron sizes (25 µm, 45 µm, 63 µm, 90 µm, and 106 µm) of the recycled BRS filler in the PTFE matrix. The effect of the filler sizes on the composites’ thermal, mechanical, and dielectric properties was studied. The dielectric properties of the composites were characterised in the frequency range of 1–12 GHz using an open-ended coaxial probe (OCP) connected to a vector network analyser (VNA). XRD patterns confirmed the phase formation of PTFE and recycled BRS glass. The scanning electron microscope also showed good filler dispersion at larger filler particle sizes. In addition, the composites’ coefficient of thermal expansion and tensile strength decreased from 12.93 MPa and 64.86 ppm/°C to 7.12 MPa and 55.77 ppm/°C when the filler size is reduced from 106 μm to 25 μm. However, moisture absorption and density of the composites increased from 0.01% and 2.17 g/cm3 to 0.04% and 2.21 g/cm3. The decrement in filler size from 106 μm to 25 μm also increased the mean dielectric constant and loss tangent of the composites from 2.07 and 0.0010 to 2.18 and 0.0011, respectively, while it reduced the mean signal transmission speed from 2.088 × 108 m/s to 2.031 × 108 m/s. The presented results showed that PTFE/recycled BRS composite exhibited comparable characteristics with commercial high-frequency laminates.

show abstract

“…Various inorganic fillers reinforced polymer composites have been described [12][13][14][15][16][17][18][19][20][21][22][23]. The composites offered better electrical, thermal and mechanical properties that cannot be obtained from the individual constituents.…”

Section: Introductionmentioning

confidence: 99%

Recycled soda lime silica glass inclusion in polytetrafluoroethylene matrix as reinforcement for microwave substrate application

Alhaji

Abbas

Zainuddin

et al. 2022

Materialwissenschaft Werkst

View full text Add to dashboard Cite

Recycled soda lime silica glass‐filled polytetrafluoroethylene composites were prepared for substrate application at microwave frequencies. Various volume fractions (0.05–0.25) of the filler were dispersed in the polytetrafluoroethylene matrix. The composites’ dielectric, mechanical, and thermal properties were examined with respect to the filler content. X‐ray diffraction data established the phase structure of the polytetrafluoroethylene matrix and recycled soda lime silica glass. Scanning electron microscope micrographs revealed uniform filler distribution at lower recycled soda lime silica contents, while energy dispersive x‐ray analysis showed the purity of the composites. The tensile strength of the composites reduced from 13.5 MPa to 4.26 MPa, while the moisture absorption and density raised from 0.07 % and 2.195 g/cm3 to 0.19 % and 2.228 g/cm3 when the recycled soda lime silica filler volume fraction was adjusted from 0.05–0.25. The lowest coefficient of thermal expansion values was recorded at 0.25 % recycled soda lime silica volume fraction, which increased from 31.12 ppm/°C to 68.32 ppm/°C at 40 °C to 200 °C. At 0.05 filler volume fraction, the respective values of ϵ' ${\varepsilon{} { {^\prime}}}$ , tanδ ${tan\delta }$ and Td ${{T}_{d}}$ of the composites decreased from 2.20, 0.0017, and 29.69 ps to 2.15, 0.0015, and 29.35 ps in the 8.2 GHz–12.4 GHz range.

show abstract

Preparation and characterization of cordierite filled PTFE laminates for microwave substrate applications

Cited by 19 publications

References 12 publications

A Robust Triboelectric Nanogenerator Resistant to Humidity and Temperature in Ambient Environment

A Robust Triboelectric Nanogenerator Resistant to Humidity and Temperature in Ambient Environment

Effects of Particle Size on the Dielectric, Mechanical, and Thermal Properties of Recycled Borosilicate Glass-Filled PTFE Microwave Substrates

Recycled soda lime silica glass inclusion in polytetrafluoroethylene matrix as reinforcement for microwave substrate application

Contact Info

Product

Resources

About