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In this letter, a novel ultrawideband (UWB) planar monopole antenna is presented that has variable band-notch frequency characteristic. The triangular-shaped antenna is electromagnetically coupled to the feed microstrip-line on one side of the dielectric substrate, and this line also directly feeds, through a via-hole, a radiating element in the form of a triangular shape in the ground plane. By inserting an equilateral triangular slot in the ground plane, a much wider impedance bandwidth is realized. Furthermore, the dimensions of conductor plane radiating element and the truncated ground plane can be used to tune the antennas' band-notch and bandwidth characteristics.
Antennas and Wireless Propagation Letters, IEEE (Volume:8 )
Date of Publication: 2009