Abstract
In this paper, we present a modified UWB antenna with hexagonal slotted ground plane inspired with a double combined symmetric T-shaped slots and dual rotated L-shaped strip for dual band notched characteristics. Initially, the operating frequency range is from 3GHz to 12 GHz. To eliminate the unwanted C-band (3.625-4.2GHz) and the entire uplink and downlink of X-band satellite communication systems (7.25 -8.39 GHz) frequency bands, we are investigating the conventional UWB patch antenna and loaded it with a mentioned strips and slots respectively. The performances of the antenna are optimized both by CST Microwave Studio and Ansoft HFSS. To further analyze the parametric effects of the slots and strips, the surface current distribution is presented and discussed. The antenna gain versus frequency gives an acceptable value except the notched band regions, these values are reduced from its normal to be a negative in the notched bands (3.625-4.2GHz) and (7.25 to 8.39 GHz).
Highlights
The UWB systems become very attractive since February 2002 when the Federal Communications Commission (FCC) allocated the frequency range from 3.1 GHz to 10.6 GHz to be a free band [1]
A microstrip UWB monopole structures with dual bandrejected characteristics based on T-shaped stubs and capacitive-load strips [10],π-shaped slot [11], parasitic strips [12] etching Open-Looped Resonator structure in an UWB antenna [13],vacator diode[14],elliptical slit UWB antenna with half circular ring radiator element [15],hook-shaped defected ground structure (DGS) and semi-octagon-shaped resonant ring of the antenna have been investigated for bands eliminating purposes
The double combined symmetrical T-shaped slots are investigated as a loaded slits in the radiating element to modify the antenna behaviors and to reject the undesired Cband .In order to eliminate the unwanted uplink and downlink bands of X-band satellite communication systems, the double symmetrical rotated L-shaped are used as a loaded strips in the hexagonal slotted ground plane to affect in the antenna response
Summary
The UWB systems become very attractive since February 2002 when the Federal Communications Commission (FCC) allocated the frequency range from 3.1 GHz to 10.6 GHz to be a free band [1]. A microstrip UWB monopole structures with dual bandrejected characteristics based on T-shaped stubs and capacitive-load strips [10],π-shaped slot [11], parasitic strips [12] etching Open-Looped Resonator structure in an UWB antenna [13] ,vacator diode[14] ,elliptical slit UWB antenna with half circular ring radiator element [15] ,hook-shaped defected ground structure (DGS) and semi-octagon-shaped resonant ring of the antenna have been investigated for bands eliminating purposes. The proposed antenna has a miniature size and uses only two simple filter element to realize dual rejected band
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