Yazar "Hah, Dooyoung" için listeleme
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RF MEMS variable attenuators with improved dB-linearity
Hah, Dooyoung (SPRINGER HEIDELBERG, 2023)A variable attenuator is one of the essential components in radio frequency (RF) systems, such as automatic gain control amplifiers and full-duplex systems. Variable attenuators based on microelectromechanical systems ... -
Shell-shaped active layers for omnidirectional organic photovoltaic cells
Hah, Dooyoung (SPIE-SOC PHOTO-OPTICAL INSTRUMENTATION ENGINEERS, 2022)For the employment of organic photovoltaic cells in wearable electronic systems, improvements in energy conversion efficiency and omnidirectionality (angular coverage) are highly appreciated. This study aims at those ... -
Symmetric Electret-Based Vibration Energy Harvesters with Curved-Beam Hinges
Hah, Dooyoung (Institute of Electrical and Electronics Engineers Inc., 2023)Broadband power spectral characteristics are desirable in vibration energy harvesters, and it can be achieved by employing curved-beam hinges, which exhibit forcedisplacement nonlinearity. Via numerical analysis by ... -
Tapered curved-beam hinges for electret-based vibration energy harvesting devices
Hah, Dooyoung (IOP Publishing, 2024)Interest in vibration energy harvesting have been growing recently for various applications. One of the major development goals for vibration energy harvesters has been improvement in energy conversion efficiency. To pursue ...
