Abstract
In this paper, we have proposed a reconfigurable antenna using micro mechanical actuation switches for K and Ku-band applications. Overall two identical cantilever micro mechanical switches (S1 & S2 ) are used to design reconfigurable patch antenna. The switches are working by electrostatic actuation mechanism. With the switches, overall the antenna is offering four resonant frequencies based on the switches ON/OFF condition. The Micro mechanical switches are offering an isolation loss of -18.5dB and an insertion loss of -1dB. The switch requires a DC actuation voltages of 6V. The Proposed reconfigurable antenna is resonating at four different frequencies based on the different switching conditions of RF MEMS switches. If S1 & S2 both are ON the antenna is resonating at 16.9GHZ, if S1 -ON & S2 -OFF the antenna is resonating at 47.3GHZ & 59.1GHZ, if S1 -OFF & S2 -ON the antenna is resonating at 28.4GHZ, if S1 -OFF & S2 -OFF the antenna is resonating at 27.9GHZ
Highlights
The latest communication applications require high speed data transmission with low power consumption, this is the significant research problem
The eventual reconfigurable microstrip antenna design is done in three steps, as an initial task we have designed an RF MEMS switch suitable in Kband and Ku-band frequency range, in the second level a microstrip patch antenna is designed and which is suitable to place RF MEMS switches, and in the final step the RF MEMS switches are placed in the proposed microstrip antenna structure as shown in figure 9
Under different switching condition of RF MEMS switches the antenna resonating in different frequencies
Summary
The latest communication applications require high speed data transmission with low power consumption, this is the significant research problem. The alternative method to get reconfigurability in microstrip patch antenna is by placing switches like PiN diodes or FET transistors and RF MEMS switches. The electrostatic actuation model cantilever based shunt capacitive RF MEMS switch is shown in figure 1. The cantilever with dimensions 300μm x 300 μm x 1 μm requires an actuation voltage of 6V to displace 2μm as shown, is the simulation result. The spring constant (k=(Ewt3)/l3) of gold cantilever structure with 300umx300umx1um dimension, E=70GPa, is theoretically value is 0.77 N/m, the required pull-in voltage for air gap of 2um with actuation electrodes cross sectional area 300umx300um is 4.5V. In this analysis we noticed that as silicon as the substrate antenna is offering best performance
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