Compact MEMS-Based Ultrawide-Band CPW Band-Pass Filters With Single/Double Tunable Notch-Bands

In this paper, novel ultrawide-band (UWB) band-pass filters with single and double tunable notch-bands are described. To the best of our knowledge, this is the first MEMS-based UWB filter reported with double tunable notch-bands. In this design, a new configuration of μ-strip coupled lines integrated with the MEMS capacitor is developed and used for tuning. The proposed structure is analyzed by considering the LC equivalent circuit of the MEMS capacitor and it is shown that an extra transmission zero (notch-band) is realized at its resonance. Each notch-band frequency can be independently tuned up to 1 GHz using MEMS capacitors actuation, while the filter performance across its ultrawide pass-band remains unchanged. The proposed filter is suitable for UWB applications when flexible interference blockage is required.