An experimental investigation of reconfigurable ultra-wideband (UWB) modified octagonal microstrip monopole patch antenna with switchable and tunable band-notched characteristic is presented in this paper. Notched-bands are obtained by connecting or disconnecting the open shunt stubs. The switching is achieved by using PIN diodes. Additionally, more notch-bands are created by adding additional stubs to the original design and tuning is achieved by employing a varactor diode in the circuit. The

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... roposed antenna has more freedom to suppress the interfering bands because of tuning nature. The proposed designs are simulated, fabricated and then tested. The proposed structures are simple in geometry and useful to operate in the rich electromagnetic scattering environment.