This article presents the design and analysis of frequency tunable circular monopole antenna with notch band characteristics. The proposed antenna consisting of slots on the radiating element to attain notch bands in the ultra wideband (UWB). The dimensions of the slots are properly adjusted and optimized to obtain the desired band rejection response. Two PIN diodes are connected between stubs and the feed line to obtain the tenability in the notch bands. The switching operation between the

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... es, controlling the length of the radiating structure and intern affecting the reconfigurable behaviour in the antenna. The overall dimension of the antenna is very compact and occupying around 44X40X1.6 mm on FR4 substrate with dielectric constant 4.4 and loss tangent 0.02. The proposed antenna initially notching WiMAX and WLAN operating bands of 3.1-3.7 GHz and 5.1-5.8 GHz and frequency tenability is analyzed with diodes switching condition to notch other communication application bands. The simulation results of reflection coefficient, radiation patterns and gain obtained from CST microwave studio and real-time measurements from prototyped antenna demonstrates the excellent working characteristics of the notch band antenna with tunable behaviour.