To demonstrate the feasibility of such miniaturized switchable devices for their implementation in electronic circuitsparticularly in the fields of signal processing and filteringthe G-CAPode was utilized for the first time as a variable capacitor to construct high-pass and bandpass filters, enabling switchable signal filtering depending on the gate Ubias. Therefore, our presented G-CAPode uniquely combines two properties: the typical U-I characteristics of a diode with the C-U characteristics of an I-MOS varactor enabling tuning circuits and band filters.