Design of Novel Highly Integrated Passive Devices for Digital Broadcasting Satellite / 802.11 Home Networking Solution in Liquid Crystal Polymer (LCP) Based Organic Substrates

2006 ◽  
Author(s):  
V. Govind ◽  
P. Monajemi ◽  
L. Carastro ◽  
S. Lapushin ◽  
C. Russell ◽  
...  
Keyword(s):  
Liquid Crystal ◽  
Liquid Crystal Polymer ◽  
Organic Substrates ◽  
Home Networking ◽  
Passive Devices ◽  
Crystal Polymer ◽  
Digital Broadcasting

Thermal Modeling of Microfluidic Channels for Cooling High Power Resistors on Multilayer Organic Liquid Crystal Polymer Substrate

2015 ◽  
Vol 137 (3) ◽  
Author(s):  
Outmane Lemtiri Chlieh ◽  
Wasif T. Khan ◽  
John Papapolymerou
Keyword(s):  
Liquid Crystal ◽  
High Power ◽  
Organic Liquid ◽  
Microfluidic Channel ◽  
Liquid Crystal Polymer ◽  
Microfluidic Channels ◽  
Organic Substrates ◽  
Crystal Polymer ◽  
Thin Film Resistors ◽  
Thermal Cooling

Thermal management is an important aspect for any packaging technology incorporating high power devices. In this paper, we present an integrated microfluidic cooling solution for high power surface mount thin film resistors on liquid crystal polymer (LCP) substrate. High power resistors are mounted on top of a 50.8 μm (2 mil) LCP layer, a coolant can circulate, thanks to a micropump, inside a Duroid micromachined channel beneath the LCP layer in order to take away the generated heat. A thermal model is combined from existing thermal models in literature to predict the overall thermal resistance of the organic heat sink in the case of a moving coolant inside the microfluidic channel. Four sets of microfluidic channels with different thicknesses are fabricated and tested. Temperature measurements of resistors with different power ratings and sizes on top of these channels agree with the model predictions and the simulations in the case of static (nonmoving) and dynamic (moving) distilled (DI) water. With this integrated solution, the case temperature of the 40 W resistor, which is mounted on the 254 μm (10 mil) microchannel, can be cooled down to 121 °C at room temperature while the resistor is dissipating 23.2 W of power; this resistor fails to operate beyond 13.3 W in the absence of fluid circulation. This is, to the best of our knowledge, the best thermal cooling performance ever achieved on multilayer organic substrates.

Fabrication of slanted liquid crystal/polymer volume grating applied to augmented reality

2020 ◽  
Vol 35 (10) ◽  
pp. 1012-1018
Author(s):  
Ming-huan LIU ◽  
◽  
Xiu-hua FU ◽  
Fei WANG ◽  
Jian TANG ◽  
...  
Keyword(s):  
Liquid Crystal ◽  
Augmented Reality ◽  
Liquid Crystal Polymer ◽  
Crystal Polymer ◽  
Polymer Volume

An electrically light-transmittance-switchable film with a low driving voltage based on liquid crystal/polymer composites

2019 ◽  
Vol 47 (1) ◽  
pp. 106-113 ◽  
Author(s):  
Chunxin Li ◽  
Mei Chen ◽  
Lanying Zhang ◽  
Wenbo Shen ◽  
Xiao Liang ◽  
...  
Keyword(s):  
Liquid Crystal ◽  
Polymer Composites ◽  
Liquid Crystal Polymer ◽  
Light Transmittance ◽  
Driving Voltage ◽  
Crystal Polymer

A compact low frequency dual band liquid crystal polymer antenna for VHF and UHF band applications

2021 ◽  
Vol 42 ◽  
pp. 1356-1360
Author(s):  
Gandu Srilekha ◽  
P. Pardhasaradhi ◽  
B.T.P. Madhav ◽  
M. VenkateswaraRao ◽  
M.C. Rao
Keyword(s):  
Liquid Crystal ◽  
Low Frequency ◽  
Liquid Crystal Polymer ◽  
Dual Band ◽  
Crystal Polymer ◽  
Uhf Band

scholarly journals Enhancing the Optical Efficiency of Near-Eye Displays with Liquid Crystal Optics

Crystals ◽  
2021 ◽  
Vol 11 (2) ◽  
pp. 107
Author(s):  
Tao Zhan ◽  
En-Lin Hsiang ◽  
Kun Li ◽  
Shin-Tson Wu
Keyword(s):  
Virtual Reality ◽  
Liquid Crystal ◽  
High Efficiency ◽  
Berry Phase ◽  
Optical Element ◽  
Liquid Crystal Polymer ◽  
Proof Of Concept ◽  
Optical Efficiency ◽  
Crystal Polymer ◽  
Light Efficiency

We demonstrate a light efficient virtual reality (VR) near-eye display (NED) design based on a directional display panel and a diffractive deflection film (DDF). The DDF was essentially a high-efficiency Pancharatnam-Berry phase optical element made of liquid crystal polymer. The essence of this design is directing most of the display light into the eyebox. The proposed method is applicable for both catadioptric and dioptric VR lenses. A proof-of-concept experiment was conducted with off-the-shelf optical parts, where the light efficiency was enhanced by more than 2 times.

Stretchable and foldable waveplate based on liquid crystal polymer

2020 ◽  
Vol 117 (26) ◽  
pp. 263301
Author(s):  
Yan Wu ◽  
Yang Yang ◽  
Ting Li ◽  
Sijia Huang ◽  
Huihui Huang ◽  
...  
Keyword(s):  
Liquid Crystal ◽  
Liquid Crystal Polymer ◽  
Crystal Polymer
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