Abstract
Slot antenna is designed with microstrip feed line for Wireless Local Area Network (WLAN) applications.
The first patch is designed as a rectangular shape and the other is designed as an inverted L shape. The
antenna is printed on a FR4 substrate with a thickness of 0.8mm and relative permittivity of 4.6.The
resulting antenna is found to have a compact size of 22.75x22mm2
. It offers dual band characteristics with -
10dB return loss and it radiates in omnidirectional pattern. The antenna receives RF signals which are
converted into DC power by connecting it through the matching circuit, rectifier and voltage multiplier.
Matching circuit is needed for matching the impedance of the antenna and the impedance of the rectifier.
Rectifier uses schottky diode (HSMS 2850) which has high switching speed and low forward voltage
convert the input RF signal received by the antenna into suitable DC supply voltage. The produced DC
voltage can be doubled by using voltage doubler. The output power from the voltage doubler is given to
low power devices for charging. These designs are simulated by using ADS 2011 (Advanced Designs
System) software
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