A Compact Bandpass Filter Manifold With Ultrawide Frequency and Bandwidth Tuning

This paper reports a comprehensive design methodology and compact multilayer integration concept for fully-reconfigurable bandpass filtering (BPF) manifold with simultaneous ultrawide center frequency bandwidth (BW) tuning. The is based on two RF-switched tune-all BPFs whose transfer function shaped by three-poles transmission zeros (TZs) (i.e., three-pole/two-TZs). Tunability can be achieved solely reconfiguring the resonant of its constituent resonators tuning-coupling less approach). A multi-layer PCB-based vertical scheme proposed size miniaturization leading to 43% smaller area than conventional single layer implementation approach. For practical validation purposes, BPF was designed, built measured. It exhibited continuous tuning between 1.8 3.85 GHz (2.2:1) BW 2.5-3:1 (e.g 132-410 MHz at 2 GHz). all aforementioned states, minimum passband insertion loss (IL) measured 2-9 dB IIP3 12.3-30 dBm.