For the purpose of wideband operations, a new half Hollow cylindrical monopole antenna for ultra wideband applications is investigated. It consisted of a half-disc monopole antenna with inserted rectangular step printed on a half hollow cylindrical substrate shape antenna and it is characterised by a small size of 30 mm × 35 mm, a simple geometry and it is fed through a 50 Ω microstrip feed line. Simulations results using electromagnetic simulator such as Ansoft HFSS proved the efficiency of this antenna in terms of bandwidth, indeed it is ranging from 4 to 6 GHz for a VSWR < 2 that include wireless local area (WLAN) band such as IEEE802.11 and wireless personnel area network (WPAN) such as Bluetooth, the lower range of the Federal Communications Commission band and ISM (Industrial, Scientifics, and Medical) band. Some techniques are investigated in order to have a notched band at this operating frequency range. Compared to the planar geometry, half Hollow cylindrical monopole antenna reduce the space occupied by the planar antenna to about 36, 28%.
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