Dowon Kim's research while affiliated with Chungnam National University and other places
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Publications (4)
Liquid crystals (LCs) offer a promising playground for developing reconfigurable radio frequency devices due to their unique dielectric properties, including large birefringence and tunability. Previous research on reconfigurable phase shifters has primarily focused on studying loss, response, and tunability. However, the influence of surface-enfor...
In various fields such as the 5G antenna system and satellite communication system, there is a growing demand to develop a smart antenna with a frequency selective or beamforming function within a limited space. While antennas utilizing mechanical, electronic, and material characteristics are being studied, a method of having tunable frequency char...
Citations
... Several advanced reconfigurable liquid crystal-based devices have been developed, including fast-reconfigurable phase shifters, devices for generating optical vortices, LC-based reconfigurable intelligent surfaces, and liquid crystal gratings. For example, Kim et al. designed a fast-reconfigurable phase shifter utilizing liquid crystal, evaluating its performance for twisted nematic and antiparallel alignment liquid crystal cell configurations 4 . Albero et al. developed two reconfigurable LC devices to generate optical vortices. ...
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... Zhang et al. effectively fabricate PSLC devices on flexible PET substrates, despite the low contrast ratio observed [38]. Yun et al. improved the polymer network morphology of RPSLCs by modifying the proportion of azobenzene acrylate and obtained RPSLC films with high contrast ratio, however, the required driving voltage was high and the transmittance of the samples at zero voltage decreased significantly with increasing monomer concentration [39]. Therefore, further investigation is required to obtain polymer-stabilised cholesteric liquid crystals with low drive voltage and high contrast ratio. ...
... The threshold voltage required to tilt the LC directors from planar towards the vertical can be determined using [25] = √ 11 0 Δ , which shows that the cell thickness does not affect the threshold voltage. Although a thick cell will result in a relatively long response time, [3] thicker LC cells will have a more significant frequency bandwidth variation from switching the director configuration of the LC substrate. In this case, thicker substrates lead to wider antenna tuning frequencies. ...
