Balanced dual-band bandpass filters using hybrid resonators with series and parallel resonances

摘要

The present invention relates to a balanced dual-band bandpass filter which comprises: two input units; output units for each of the input units; a series portion to connect two first parallel resonators in series; and a parallel portion to connect a second parallel resonator and a second series resonator in parallel, wherein the two input units are connected using the series portion. Thus, the balanced dual-band bandpass filter can be used in a multi-band communication system to reduce the size of the system, and can easily implement the multi-band communication system.