For the purpose of wideband operations, partial grounded substrate patch antenna is investigated. The antenna consisted of a parabolic planar monopole printed on a thin dielectric FR4.epoxy substrate of ε_τ = 4.4 permittivity and is fed through a partial grounded substrate mi-crostrip line. Various prototypes with different parabolic contours equations and the same length are analysed using Ansoft HFSS electromagnetic simulator based on the finite element method and measured using a vector network analyser Anritsu 37369C (40MHz to 40 GHz) where the calibration plane is the SMA connector jack used to connect the antenna. The best simulated and measured results where obtained for a parabolic planar patch monopole antenna defined by the geometrical equation y = 0.044x~2. These results concord and proved the ultra wide band behaviour of this design. Nevertheless, the bandwidth is ranging from 3.5 GHz to 16 GHz for a VSWR < 2. It includes the wireless local area (WLAN) band such as IEEE802.11, wireless personnel area network (WPAN) such as Bluetooth and it contains the two ranges of the ISM (Industrial, Scientifics, and Medical band) bands defined by the ITU-R (International Telecommunication Union-Radio communication sector) witch are [2.4 GHz, 2.5 GHz] and [5.725 GHz, 5.875 GHz]. The proposed UWB antenna can be also used in the biomedical systems. Simulated results in terms of electrical parameters and radiation pattern show that this parabolic planar antenna is characterized by an omnidirectional radiation pattern.
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