Three notched bands are generated, at selected frequencies, in an extremely wideband base antenna to support multiple communication systems while avoiding inference from other existing narrowband 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 0.72 GHz, to 25 GHz with a ratio bandwidth of 34 : 1.The antenna has a simple structure and can be fabricated at low cost for multi-band and wideband 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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Liu et al. (2012) studied this question.
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