The 225-400MHz VHF band is a mainstream frequency spectrum deployed for tactical private communication, airborne and vehicular RF subsystems, industrial wireless telemetry and general RF test instrumentation. This frequency range suffers from intensive spectrum superposition, out-of-band spurs, sub-harmonic interference and inter-band crosstalk, which severely degrades signal fidelity of RF transc……

The RF filter is one of the essential key components in the radio frequency system. It is mainly used for frequency selection—letting the required frequency signal pass and reflecting the unwanted interference frequency signal.A classic example of a filter application is a receiver or transmitter front end, as shown inFigure 1: Receiver RF Front-EndAs can be seen from Figure 1, the filter is wid……