Highly Selective Reconfigurable Filter for UWB Systems

A novel highly selective compact reconfigurable filter with a switchable notched band for ultrawideband (UWB) systems is presented. The proposed filter exhibits two distinct features by altering switching device such as PIN diode (BAP65-02) in this case. First, a switchable notched band is generated which facilitates a rejection at 3.5 GHz to avoid interferences from the WiMAX systems. Later, a reconfigurable filter is developed which changes from bandpass to bandstop at the same UWB (3.1-5.2 GHz) spectrum. The filter shows very low pass-band insertion loss and five transmission zeros are created between passband edges to enhance the signal selectivity and broad rejection at the stopband. A filter sample is fabricated to provide an experimental verification on the proposed filter. The proposed filter is able to achieve significant size reduction as compared to an conventional reconfigurable filters and bandpass filters with notched band.