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A Novel Compact Size Dual Notched Bands UWB Elliptical Monopole Antenna

Author(s): Emad S. Ahmed | Maalim Qasim Mohammed,

Journal: International Journal of Engineering and Advanced Technology
ISSN 2249-8958

Volume: 2;
Issue: 6;
Start page: 176;
Date: 2013;
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Keywords: Ultra wideband | CPW-fed UWB antenna | band-notched characteristics.

In this paper, a new compact ultra-wideband printed elliptical monopole antenna is presented. The proposed antenna operates over a wideband from 2.85 to 15.4 GHz for voltage standing wave ratio (VSWR) less than two. Two modifications are introduced to enhance the frequency-impedance characteristic of the presented elliptical monopole antenna. The first one is to chamfer the edges of the ground plane with 45┬░angle. The second modification is to use asymmetrical in length finite ground planes. By utilizing a symmetrical L-shaped slot and an inverted U-shaped slot embedded in the radiating patch and feed line respectively, a dual band notched characteristic were achieved. These bands are 3-4 GHz and 5-6 GHz used for WiMAX and WLAN operations. The center frequency and the width of the notch bands are adjusted by varying the length and the width of the slots. The antenna shows omnidirectional radiation pattern characteristics with acceptable gain. Compared with other recently proposed dual band notch antennas, the proposed antenna exhibits advantages of a compact size, simple structure, wide bandwidth and good band-notch characteristic. The simulation results are obtained and optimized using a commercial electromagnetic simulator CST Microwave Studio.
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