Multi-strip resonator BPF with extended spurious suppression in LTCC structure -proposal of new concept to suppress spurious response in BPF-

A new comprehensive method to suppress the spurious modes in a BPF is proposed taking the multi-strip resonator BPF as an example. It consists of disturbing the resonant frequency, coupling coefficient and external Q of the higher-order modes at the same time. The designed example has shown an extraordinarily good out-of-band responses in the computer simulation.