A very compact UWB antenna with four notched bands is proposed. The antenna consists of a rectangular radiating patch with a half circle at bottom, a tapered microstrip feed-line, and a semielliptical ground plane. With a pair of Lshaped slots, complementary co-directional SRR on the patch and a pair of L-shaped slots on the ground plane, four notched bands are created to prevent interference from WiMAX /WLAN/X-band. Experimental results show that the designed antenna, with compact size 20×30mm2, has an operating band(VSWR<2) from 2.7 to 20GHz,except four stop bands of 3.1~3.7GHz, 5.13~5.48GHz, 5.74~6.04GHz, 7.3~7.96GHz. And good radiation patterns within the operating band have been observed.
Considering antenna pattern and Doppler frequency-shift separately, the theory model about targets near-field scattering is established from a simple target, using PO (physical optics) method depending on SCTE(Scattering from Complex Targets and Environments)system[1].Then some curves are presented which are in accordance with the results given by references. The calculated results show that the influence of the factors over targets near-field RCS are complex and important. This work has practical engineering value in the modern and high science and technology warfare.
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