Dielectric properties of modified BNT/PTFE composites for microwave RF antenna applications

Jin, Shiqi; Xu, Qiu; Huang, Baoyu; Wang, Lixi; Zhang, Qitu; Fu, Zhenxiao

doi:10.1007/s10854-016-4849-y

Cited by 16 publications

(7 citation statements)

References 32 publications

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“…The peak (2θ = 17°) is identified as PTFE (#JCPDS number 00‐054‐1595) and the patterns show that the density of PTFE phase decreases with the LT filler content increasing. Meanwhile, there is no obvious change by comparing the patterns of LT powders and LT/PTFE composites with various LT content, which indicates the formation of LT/PTFE heterogeneous mixture and chemical stability of LT powders …”

Section: Resultsmentioning

confidence: 95%

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Medium dielectric constant and low‐loss PTFE composites filled with MgO‐LiF co‐doped Li₂TiO₃ particles

Wang

Tong³

et al. 2019

J of Applied Polymer Sci

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In this work, we presented a simple strategy to fabricate medium dielectric constant and low-loss composites for microwave substrate applications. MgO-LiF co-doped Li 2 TiO 3 (LT) powders were fabricated by the solid-state reaction route and modified by perfluorooctyltriethoxysilane (F8261). The LT/polytetrafluoroethylene (PTFE) composites were fabricated by cold pressing and hot treatment. The XPS and contact angle analysis indicated that the fluorinated group was introduced to LT particle successfully. The effects of modified LT powders content on the dielectric, thermal, and mechanical properties of composites were investigated. As the modified LT content increases, the dielectric constant, dielectric loss, and temperature coefficient of dielectric constant (τ ε ) increase while the bending strength and coefficient of thermal expansion (CTE) decrease, which is attributed to the higher dielectric constant of LT ceramic, more pores, stable τ ε of LT ceramic, interface defects and low CTE of LT ceramic, respectively. The composites with 60 wt % LT exhibit the best microwave dielectric properties: ε r = 6.8, tanδ = 0.001, τ ε = −29.6 ppm C −1 at 8 GHz and acceptable coefficient of thermal expansion (28.3 ppm C −1 ). Therefore, modified LT powders filled PTFE composites are potential materials for high-frequency microwave substrate applications.

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Section: Resultsmentioning

confidence: 95%

“…For the past decades, there have been great efforts to focus on the study of low dielectric constant (2–5) and high dielectric constant (>8) PTFE‐based composites substrates . Luo et al .…”

Section: Introductionmentioning

confidence: 99%

Medium dielectric constant and low‐loss PTFE composites filled with MgO‐LiF co‐doped Li₂TiO₃ particles

Wang

Tong³

et al. 2019

J of Applied Polymer Sci

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“…65 PTFE/Teflon has a low dielectric constant, varying from 1.96-2.1 and low water absorption. 66,67 The comparison of dielectric substrates is shown in Table 3.…”

Section: Thz Antennasmentioning

confidence: 99%

THz antennas design, developments, challenges, and applications: A review

Pant¹,

Malviya²

2023

Int J Communication

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Terahertz (0.1-10 THz) wireless communication will be the future technology to reach a top-notch data rate. THz is one of the most promising candidates for 6G systems because it provides enormous bandwidth, up to 100 GHz, and a massive data rate of up to 1 Tbps. THz antennas, antenna arrays, and MIMO antenna arrays in 6G are hot research topics for implementing 6G wireless communication systems. The 6G aims to continue to enhance the features of the 5G as it is capable of achieving the maximum high-speed data rate, excellent reliable communication, massive connectivity, and very low latency connectivity. The 6G requirements need high-gain antenna arrays and MIMO antenna arrays to combat the effect of atmospheric losses in high frequencies. An in-depth discussion of the planar THz antennas that have been extensively used in THz applications like imaging, sensing, and Internet-of-Things (IoT) has been conducted. The study of the THz antennas, antenna arrays, and MIMO antennas on different conducting materials such as copper and graphene, which are designed on different dielectric substrates such as polyimide, quartz, liquid crystalline polymer, and polytetrafluoroethylene, has been carried out in detail. Metamaterial, photoconductive, plasmonic antennas, and THz beamforming are significant parts of THz communications. This paper also provides antennas and antenna arrays based on them.

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“…The material uses nanoscale Al 2 O 3 powder and PTFE powder as doping materials. Al 2 O 3 is chosen because of its high dielectric constant, while PTFE has a lower loss tangent than ordinary material [ 32 , 33 , 34 ]. Therefore, when trying to dope Al 2 O 3 and PTFE powder in PDMS, it is necessary to improve the performance parameters and ensure that it is flexible at the same time.…”

Section: Antenna Designmentioning

confidence: 99%

Flexible Wearable Composite Antennas for Global Wireless Communication Systems

Zhang

Wang

et al. 2021

Sensors

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Although wearable antennas have made great progress in recent years, how to design high-performance antennas suitable for most wireless communication systems has always been the direction of RF workers. In this paper, a new approach for the design and manufacture of a compact, low-profile, broadband, omni-directional and conformal antenna is presented, including the use of a customized flexible dielectric substrate with high permittivity and low loss tangent to realize the compact sensing antenna. Poly-di-methyl-siloxane (PDMS) is doped a certain proportion of aluminum trioxide (Al2O3) and Poly-tetra-fluoro-ethylene (PTFE) to investigate the effect of dielectric constant and loss tangent. Through a large number of comparative experiments, data on different doping ratios show that the new doped materials are flexible enough to increase dielectric constant, reduce loss tangent and significantly improve the load resistance capacity. The antenna is configured with a multisection microstrip stepped impedance resonator structure (SIR) to expand the bandwidth. The measured reflection return loss (S11) showed an operating frequency band from 0.99 to 9.41 GHz, with a band ratio of 146%. The antenna covers two important frequency bands, 1.71–2.484 GHz (personal communication system and wireless body area network (WBAN) systems) and 5.15–5.825 GHz (wireless local area network-WLAN)]. It also passed the SAR test for human safety. Therefore, the proposed antenna offers a good chance for full coverage of WLAN and large-scale development of wearable products. It also has potential applications in communication systems, wireless energy acquisition systems and other wireless systems.

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Dielectric properties of modified BNT/PTFE composites for microwave RF antenna applications

Cited by 16 publications

References 32 publications

Medium dielectric constant and low‐loss PTFE composites filled with MgO‐LiF co‐doped Li₂TiO₃ particles

Medium dielectric constant and low‐loss PTFE composites filled with MgO‐LiF co‐doped Li₂TiO₃ particles

THz antennas design, developments, challenges, and applications: A review

Flexible Wearable Composite Antennas for Global Wireless Communication Systems

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Dielectric properties of modified BNT/PTFE composites for microwave RF antenna applications

Cited by 16 publications

References 32 publications

Medium dielectric constant and low‐loss PTFE composites filled with MgO‐LiF co‐doped Li2TiO3 particles

Medium dielectric constant and low‐loss PTFE composites filled with MgO‐LiF co‐doped Li2TiO3 particles

THz antennas design, developments, challenges, and applications: A review

Flexible Wearable Composite Antennas for Global Wireless Communication Systems

Contact Info

Product

Resources

About

Medium dielectric constant and low‐loss PTFE composites filled with MgO‐LiF co‐doped Li₂TiO₃ particles

Medium dielectric constant and low‐loss PTFE composites filled with MgO‐LiF co‐doped Li₂TiO₃ particles