Instead of a normal capacitor the reported printed G-CAPode was utilized to achieve a switchable capacitance and therefore a tunable fC depending on the applied bias voltage using a 1 Ω resistor in the circuit and an alternating input voltage of 0 ± 0.1 V. Depending on the applied gate Ubias, the frequencies can pass through (Vout is high) when the negative Ubias of (-1 V) is applied (high capacitance) but the frequencies are attenuated (Vout is low) when a positive Ubias (0.75 V) is applied (Figure ).