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A novel super wideband notched printed trapezoidal monopole antenna with triangular tapered feedline

A novel ultra broadband planar monopole antenna with band notch characteristics is presented. An ultra broadband of 3.1 GHz-94.7 GHz (31:1) is achieved. Improved designs are used for microstrip feed line, feed region of the antenna and radiating element to obtain ultra broadband characteristics. A triangular tapered microstrip feed line is used, nearly optimal taper or curve is employed in the feed region and the ground plane feed gap is optimized to 1.4 mm. The radiating element isa trapezoidal patch. The overall dimensions of the antenna are 40×30×1.6mm3. Band notch characteristics in WLAN operating region is achieved by placing a U-shaped slot in radiating patch. The peak of notch characteristics occurs at 5.55 GHz in 4.85 GHz-5.85 GHz rejection band. Moreover, good omni-directional radiation pattern, approximately constant peak gain and better efficiency is observed. A simple design for ultra broad bandwidth adds merit to this antenna. This antenna can be used for ultra wideband (UWB) and super wideband (SWB) applications.