Abstract The design and analysis of an ultra wideband aperture antenna with dual-band-notched characteristics are presented.The proposed antenna consists of a circular ring exciting stub on the front side and a circular slot on the back ground plane.By utilizing a parasitic strip and a T-shaped stub on the antenna structure, two notched bands parfum of 850 MHz (3.
5-4.35 GHz) and 900 MHz (5.05-5.
95 GHz) are achieved.The proposed antenna is fabricated and measured.Measured results show that this antenna operates from 2.
3 GHz to upper 11 GHz for voltage standing wave ratio less than 2, except two frequency Knife Sharpener notched bands of 3.5-4.35 and 5.
05-5.95 GHz.Moreover, the experimental results show that proposed antenna has stable radiation patterns and constant gain.
A conceptual circuit model, which is based on the measured impedance of the proposed antenna, is also shown to investigate the dual-band-notched characteristics.