FILTER, DUPLEXER, COMMUNICATION MODULE AND COMMUNICATION DEVICE

摘要

In order to reduce the loss and increase the bandwidth of a filter, an inductor (L11) is connected in parallel with an input-side parallel resonator (P11) and an inductor (L12) is connected in parallel with an output-side serial resonator (S12). The inductors (L11 and L12) are each connected along different paths (along paths between the serial and parallel resonators). With this configuration, impedance matching between the input and the output is possible and, therefore, it is possible to provide a ladder filter with low loss and high bandwidth.