Characterization of anisotropic substrates from RF, mm-Wave to THz: Design of 3D conformal antenna for connected objects

Wane, Sidina; Leyssenne, Laurent; Lesénéchal, Dominique; Domengès, B.; Massenot, Sébastien; Cayron, Audrey; Descamps, Philippe

doi:10.1109/cama.2016.7815818

Cited by 1 publication

(3 citation statements)

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“…As a high-frequency alternative to traditional PCB materials, LCPs have a low loss tangent (tanδ) range of 0.002-0.005 below 110 GHz and a low water absorption rate of <0.04% [10,20]. The loss tangent remains low at THz frequencies, i.e., 0.0055-0.009 from 110 to 170 GHz [21], 0.009-0.012 from 170 to 330 GHz [22], and less than 0.09 up to 1.8 THz [23]. On the other hand, the dielectric constant range of LCP films is 3-3.5 from DC up to 1.8 THz [10,11,[21][22][23], which is suitable for antenna applications to improve the radiation efficiency.…”

Section: Introductionmentioning

confidence: 99%

“…The loss tangent remains low at THz frequencies, i.e., 0.0055-0.009 from 110 to 170 GHz [21], 0.009-0.012 from 170 to 330 GHz [22], and less than 0.09 up to 1.8 THz [23]. On the other hand, the dielectric constant range of LCP films is 3-3.5 from DC up to 1.8 THz [10,11,[21][22][23], which is suitable for antenna applications to improve the radiation efficiency.…”

Section: Introductionmentioning

confidence: 99%

“…In 2015, Gao et al used microstrip lines on 50-µm-thick LCP substrates to characterize the dielectric constant and loss tangent from 220 to 330 GHz [22]. These properties have been characterized up to 1.8 THz by using THz spectroscopy [23]. High-accuracy methods for characterizing LCP properties are still being investigated [24,25].…”

Section: Introductionmentioning

confidence: 99%

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Flexible Liquid Crystal Polymer Technologies from Microwave to Terahertz Frequencies

Zhou

Qian

et al. 2022

Molecules

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With the emergence of fifth-generation (5G) cellular networks, millimeter-wave (mmW) and terahertz (THz) frequencies have attracted ever-growing interest for advanced wireless applications. The traditional printed circuit board materials have become uncompetitive at such high frequencies due to their high dielectric loss and large water absorption rates. As a promising high-frequency alternative, liquid crystal polymers (LCPs) have been widely investigated for use in circuit devices, chip integration, and module packaging over the last decade due to their low loss tangent up to 1.8 THz and good hermeticity. The previous review articles have summarized the chemical properties of LCP films, flexible LCP antennas, and LCP-based antenna-in-package and system-in-package technologies for 5G applications, although these articles did not discuss synthetic LCP technologies. In addition to wireless applications, the attractive mechanical, chemical, and thermal properties of LCP films enable interesting applications in micro-electro-mechanical systems (MEMS), biomedical electronics, and microfluidics, which have not been summarized to date. Here, a comprehensive review of flexible LCP technologies covering electric circuits, antennas, integration and packaging technologies, front-end modules, MEMS, biomedical devices, and microfluidics from microwave to THz frequencies is presented for the first time, which gives a broad introduction for those outside or just entering the field and provides perspective and breadth for those who are well established in the field.

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