A novel ultra wideband (UWB) filter with double tunable notch-bands using MEMS capacitors

This paper presents a novel UWB filter with double tunable notch bands on coplanar technology. Each notch-band frequency can be independently tuned using MEMS capacitors while the filter performance across its ultra-wide pass band remains unchanged. The measured results indicate up to 1GHz independent tuning range for each notch frequency. To our knowledge, this is the first UWB filter reported with double tunable notch bands. In addition, a high impedance resonator has been incorporated and a size reduction of up to 66% has been achieved compared to its conventional half wavelength counter parts. The proposed filter is suitable for ultra wide band applications when flexible interference blockage is required.