Affiliations: [a] Electronics and Communication Engineering, Thapar
University, Patiala, India | [b] Department of Electronics and Communication
Engineering, Thapar University, Patiala, India
Correspondence:
[*]
Corresponding author: Paras Chawla, Electronics and
Communication Engineering, Ph. D. Research Scholar, Thapar University, Patiala,
Punjab-147004, India. Tel.: +91 9896180750; E-mail: [email protected];
[email protected]
Abstract: The full-wave analyses and design of a multiband reconfigurable
antenna (MRA) using radio frequency microelectromechanical system (RF MEMS)
switches is presented for 1.0–10.0 GHz band. Integration of spiral
antenna and MEMS switches on a conventional FR4 printed circuit board
(ε_r= 4.4 and tanδ=0.002) is designed. This
paper also gives the construction and performance of low loss MEMS resistive
switches and further describes the important improvements in the construction
of the switches. The RF switches used here exhibit very good RF characteristics
with typical values of pull-in voltages lies between 3.5 to 20.25 V. The
cantilever beam structure of Design-3 switch offers pull-in voltage as low as
3.5 V at air gap g_0= 0.5 μm. Further, Design-1 switch
have insertion losses lower than 0.39 dB in ON position, and isolation of
"Design-2" switch as high as 79.83 dB in OFF position. As compared to all
presented switches the "Design-3" switch has optimized displacement time
response i.e. 2 ms. The effect of optimized "Design-3" switch is than study
along with spiral antenna. The overall arm length of spiral is changed by
activating and deactivating the three "Design-3" switches and consequently its
frequency reconfigured. Finally, optimization procedure using quasi Newton
method is introduced for characterizing antenna by changing slot length. The
wide bandwidth ranging from 200 MHz to 1.65 GHz at different multiband of
proposed MRA indicates device contribution in enhancing the mobile TV and
internet application speed.
Keywords: Finite element methods, electromagnetics, microelectromechanical systems, antennas, Newton method, mobile RF front end
