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Design and analysis of enhanced capacitive radio frequency MEMS switch based on Nb 2 O 5 and HfO 2 dielectric for satellite payload applications
Author(s) -
Narzary Trigunesh,
R Kumar,
Bhattacharjee Rituraj,
Brahma Muktimani,
P Mohamed Shakeel.
Publication year - 2020
Publication title -
transactions on emerging telecommunications technologies
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.366
H-Index - 47
ISSN - 2161-3915
DOI - 10.1002/ett.4061
Subject(s) - materials science , capacitance , capacitive sensing , dielectric , insertion loss , electrical engineering , hfss , optoelectronics , voltage , high κ dielectric , radio frequency , engineering , electrode , physics , microstrip antenna , quantum mechanics , antenna (radio)
An innovative capacitive radio frequency MEMS shunt switch with a unique shaped spring is designed and analyzed using COMSOL Multiphysics 5.4. The proposed switch using Hafnium oxide (HfO 2 ) and Niobium pentoxide (Nb 2 O 5 ) as the dielectric material between the transmission line and the deflecting gold membrane provides certain advantageous benefits with respect to performance parameters such as low actuation voltage, less spring constant, good isolation, low insertion loss, small size, and high capacitance ratio compared to other designs. A combination of three‐turn meander and C‐ shaped spring having a spring constant of 0.186 N/m helps in achieving convenient actuation voltage. For 1, 1.5, and 2 μm air gaps, the actuation voltages required to bring the switch to ON mode are 1.77, 3.24, and 4.96 V respectively with Nb 2 O 5 as the dielectric layer and 1.8, 3.28, and 5.01 V respectively with HfO 2 as the dielectric layer respectively. At 2‐μm air gap, the capacitance ratio is 329 for Nb 2 O 5 and 113 for HfO 2 . RF analysis using ANSYS HFSS software shows the isolation of −19.41 dB at 11 GHz and insertion loss as low as −0.27 dB at 15 GHz. The proposed switch operating within the range of 1 to 30 GHz gives optimum results compared to other devices and is suitable for wireless communication and satellite payload applications.