A printed ultra-wideband (UWB) monopole antenna with both tunable and switchable band-notched characteristics is proposed. An embedded resonant slot loaded with a varactor and a pin diode controlled by DC signal through one common bias network is employed to tune and switch the notch band. In the ``all-pass'' state when the two diodes are partially turned on, the power consumption of this active antenna is only 2.4 μW. Measured return loss, radiation pattern, gain and group delay of the introduced antenna are presented in this paper.
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