International journal of electronic and electrical engineering systems
Volume 1, Numéro 2, Pages 13-16
2018-06-30
A Modified Circular Monopole Uwb Antenna With Wimax/wlan Dual Band Notch Function
Authors : Guichi F. . Challal Mouloud .
Abstract
In this paper, a WiMAX/WLAN dual band notched antenna for UWB applications is presented. The proposed antenna is composed of a modified circular patch fed by a 50 microstrip line printed on the upper side of a Rogers AD450 substrate ,and a semi circular ground which is printed on the bottom side of the substrate with defected ground structure underneath the transmission line to cover the UWB. The WiMAX (3.4-4.1 GHz) band is rejected by inserting a narrow circular ring slot on the patch whereas the WLAN (5-6.3 GHz) band is notched using an inverted U shaped slot etched on the ground plane. In order to investigate the performance of the proposed structure ,a parametric study is carried out and the current distributions are simulated at the center frequencies of rejected bands. The antenna covers widely the FCC band allocated to the UWB operation from 2.5 GHzto 14 GHz, and exhibits an omnidirectional radiation pattern in the H-plane and a monopole like radiation pattern in the E-plane. A good agreement between the simulated and measured results indicates that the proposed structure is suitable for UWB systems.
Keywords
UWB, WiMAX, WLAN, Slot, VSWR, Gain, Radiation pattern.
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