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A Novel 2-Pole Tunable Coplanar Filter using Integrated Phase Change Material Switches

A novel tunable filter based on the use of PCM switches is presented. The filter center frequency can be switched between 5.95 and 6.8 GHz, using bi-stable Phase Change Material (PCM) RF switches. The 1 GHz bandpass filter has insertion loss between 4.5 and 5.5 dB. By integrating the bias circuit in the filter resonator, the loss attributed to the bias circuit can be minimized. Its influence on the filter response is discussed using various bias configurations.