Abstract
The effect of placing a conducting reflecting sheet at the back of ultra wideband slotted hexagonal patch antenna for wireless application is presented here. The UWB slotted hexagonal patch antenna without reflecting sheet at the back showed omni directional radiation pattern and good impedance matching criteria. It is shown that antenna design with tilted feed line produces a bandwidth of 127% (2.7 – 12.5 GHz) which is more than the required ultra wideband range of 3.10 to 10.6GHz. The size of the ground plane considered is 34 X 29mm, which is suitable for portable wireless communication devices. The effect of placing a conducting reflecting sheet at the back of slotted hexagonal patch antenna is investigated. It is shown that, the proposed antenna provide directional radiation pattern but with reduced impedance matching criteria. The effect of varying the spacing ‘d’ between the antenna and the reflecting sheet from 5mm to 25mm was investigated. It was found that the antenna was matched with a return loss (S11) better than -10dB within the frequency range 2.55GHz to 11.55GHz. It provides an impedance matching bandwidth of 128%.
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