A Novel Spade-Shaped Ultrawideband Antenna with Dual Band-Notched Characteristics.

Novel dual band-notched monopole antenna is proposed in this paper, which is designed by an improved particle swarm optimization algorithm linked with HFSS. By etching a one order Minkowski fractal slot on the radiating patch and introducing a semi-octagon-shaped resonator on the back plane, excellent dual notched frequency bands characteristics of the proposed antenna are achieved. The antenna satisfies the VSWR requirement of less than 2.0 in the frequency band between 2.87 and 12 GHz, except two frequency stop-bands of 3.2–4.01 GHz and 5.55–6.1 GHz. The effects of the key parameters on the dual notched bands are also analyzed. A fairly stable radiation pattern over the frequency range of interest can be obtained. Moreover, measured group delay and transmission characteristics indicate that the antenna has good pulse handling capabilities. [ABSTRACT FROM AUTHOR]