Compact Tunable Non-Reciprocal Bandpass Filter with the aid of Combline Architecture

Time-varying transmission lines (TVTL)-based non-reciprocal filters have lately grown in popularity. Their functionality is based on the use of sinusoids with progressive phase shifts to time-modulate spatially separated resonators. This work presents an EM simulated response of a non-reciprocal bandpass filter designed using combline architecture. The design methodology has been analyzed with the aid of coupling matrix and the circuit manifests a compact and tunable non-reciprocal bandpass response suitable for mobile communication frequency range. The variation of insertion loss, isolation, and return loss is 3.7 dB to 4.1 dB, approximately 20 dB, and 20 dB respectively, throughout the tunability range. The circuit possesses the potential for deployment in any monolithic integrations.