Study of an extremely wideband monopole antenna with triple band-notched charactersistics

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.

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