STUDY OF AN EXTREMELY WIDEBAND MONOPOLE ANTENNA WITH TRIPLE BAND-NOTCHED CHARAC- TERISTICS

Abstract—Three notched bands are generated, at selected frequen-cies, in an extremely wideband base antenna to support multiple com-munication systems while avoiding inference from other existing nar-rowband systems. The design of a fully printed extremely wideband antenna and creating triple band-notched functions are addressed in this paper. Measurements demonstrate that the proposed printed base antenna has an extremely wide 2: 1 VSWR bandwidth from 0.72GHz, to 25GHz with a ratio bandwidth of 34: 1. The antenna has a simple structure and can be fabricated at low cost for multi-band and wide-band wireless communication devices. Besides, this paper presents a technique to form three notched bands within the operating frequency range of the base antenna. By introducing a half-wavelength U-shaped defected ground structure (DGS) and a pair of quarter-wavelength open arc-shaped slots to the radiating patch, three notched bands are created to prevent interference from WLAN (2.4–2.484GHz and 5.15– 5.85GHz) systems and downlinks of X-band satellite communication (7.25–7.75GHz) systems